Aerodynamics Gust Response Prediction (Mechanical Project)

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This project presents the work performed within the aerodynamics department of Airbus Operation SAS in Toulouse. This department works with the industrialization and the use of tools developed by laboratories to perform CFD aerodynamic simulations. The primary purpose of the present work was to support the development of gust analysis methods based on CFD.


A new gust model has been developed and integrated to the aerodynamic solver elsA.This solver has been used in order to compute the unsteady aerodynamic simulations for both gust loads and forced motions with CFD. The results were then compared with those from a Doublet Lattice Method computation for validation. Once the validation phase was ended with good agreement between the two methods, a Chimera simulation has been carried out.
Source: KTH
Author: Rigaldo, Alexis


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Automated Propulsion Kit Selection for MAV: A Design Process Tool (Mechanical Project)

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The emphasis of the project lies in the exploration of automatic selection of components for a propulsion kit. Specifically for this project, propulsion based on electric power and meeting the requirements for use in a Micro Aerial Vehicle (MAV). The key features include a systematic selection method based on user criterias and a model for evaluating propeller performance. These are implemented in a program written as a part of the project.


The conclusion is that it is possible to make a program capable of a component selection and that the programs usability is mainly reliant on three factors: model for propeller evaluation, method of selection and the quality of the component database.
Source: Linköping University
Author: Björk, Daniel


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Automatic Trimmerhead (Mechanical Project)

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Automatic trimmerhead is an examination project for making an automatic trimmerhead for grass trimmers with the user and functionality in focus. Our perception is that a happy user is a user who can pick up his or her trimmer, use it and put it back to its place when the job is done. It should not be necessary to interrupt work and perform maintenance on the machine just to make it work as promised.


The project has been made in collaboration with the company Husqvarna, which is one of the biggest actors dealing with garden machinery on the market. Together we determined the project goal, “To invent, construct and test a brand new concept for how an automatic trimmerhead can look and function”.


At this day there are several different automatic trimmerheads on the market, both semi and fully automatic. After having seen and tested many of these trimmerheads, we have come to the following conclusion. They are either difficult for users to handle or has unreliable functions, sometimes both. We have, with this kept in mind, tested and analyzed the different models to find the problem. We found one, and maybe the only, reason to why these trimmerheads does not function as promised. All the trimmerheads functions are based on the increased rotation speed that will occur when the cord breaks off.


In our product we have therefore designed a mechanical solution that feed cord based on not only the force affecting the cord but also on the length of the cord. A trimmerhead with a cord feeding function which can activate based on the length of the cord does not exist on the market and is according to Husqvarna, who has much knowledge on the subject, a new and very interesting way of solving the problem.


Since the beginning of the project we have had many ideas and surely we have encountered even more problems, but this is what has given us the knowledge we needed to make it to where we are today. The result of this is a brand new concept with good patent possibilities on several parts and functions which have given Husqvarna everything they need to continue the work and to turn our solution into a high quality product.
Source: Halmstad University
Author: Axenskär, Christian | Winde, David


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Mapping and analyzing Ventilation system in University building (Mechanical Project)

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This study of Quality in Process Technology deals with Process Improvement. The ventilation system of University building is dealt as a Process and is looked for improvements. The ventialtion system for two computer rooms is studied and analyzed for the variaitons in the operating conditions.
Source: Mälardalen University
Author: Ali, Sadaqat | Thummakul, Possavee


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Geometry-dependence of the adhesive strength of biomimetic, micropatterned surfaces (Mechanical Project)

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Pressure sensitive adhesive surfaces are often inspired by nature. Miming the toe-surface of gecko, engineered surfaces made of thousands of micro-pillars show promising adhesive properties. This surfaces, covered with cylindrical pillars arranged into a pattern have adhesive properties greatly dependent on the geometrical characteristics. In this thesis, have been studied successively two models of micro-patterned surfaces, one two-dimensional, the other in three-dimensional using a FEM tool.


Varying geometry parameters, has been determined optimal geometries to improve adhesive strength on these biomimetic, micropatterned surfaces. This study concludes to the non-adaptability of one-level scale micropatterned surface to large area of adhesion, to the strong advantage from the point of adhesion per contact area for high aspect ratio at each level of the geometry and study the opportunity of hierarchical structures. Some further suggestions of improvements to adhesion properties are discussed in the final chapter.
Source: Linköping University
Author: Ginebre, Emmanuel


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Formula SAE Cooling System Design (Mechanical Project)

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The overall objective of this senior project is to develop, via testing and analysis, a guided process that will aid the Cal Poly Formula SAE team in designing their cooling system. More specifically, a set of designed tests will yield the results necessary in determining a combination of fan and radiator that will achieve appropriate cooling.


A test section that has the capability of interfacing with both the wind tunnel in the Thermal Science Lab and a radiator will be used to facilitate the necessary experiments. The wind tunnel is powered by fan controlled by a variable frequency drive that can induce a range of air flow rates through the duct and radiator. Five tests will be performed, whose goals are as follows:


  • Determine mass flow rate of the cooling water as a function of the crank shaft rotational speed.

  • Determine heat rejected from the engine to the cooling water as a function of crank shaft rotational speed.

  • Determine the mass flow rate of air through the core as a function of car speed.

  • Determine static pressure drop of the air across the radiator core at varying air mass flow rates.

  • Determine the heat rejection rate associated with a test radiator as a function of both the mass flow rate of air through the core and the mass flow rate of cooling water.

These tests will develop relationships that will ultimately allow the formula team to predict the heat rejection necessary at every car speed as well as the ability of a particular radiator to reject heat at those speeds.


A guided process will be presented that will aid the team in designing the cooling system to be used on the formula competition car. By performing these tests, the FSAE team can choose an appropriate radiator type and face area for the racecar’s specific cooling needs each year. This process will allow the team to minimize the radiator’s size and optimize cooling to increase performance.


The following report will detail background information regarding a car’s cooling system, a description of conceptual designs, the final design process, the test procedures and finally sample results produced via testing.
Source: California Polytechnic State University
Authors: Lisa Van Den Berg | Brandon Lofaro


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Fuel Efficiency in AWD System (Mechanical Project)

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This degree project has been made in cooperation with engineers working for GM Engineering/Saab Automobile AB in Trollhättan. The given name by Saab for the project is “Fuel efficiency improvements in All Wheel Drive(AWD)-system”.


The main tasks of this thesis work were to investigate the size of the power losses in different parts on the propeller shaft, to design a computer program that calculates coordinates and angles on a propeller shaft and to investigate the possibilities to put together a simplified formula that calculates the natural frequencies on a propeller shaft.


The main parts of this report are a compilation of the theory about AWD and mostly about the parts on the propeller shaft, and also a description of the developed computer program called Propeller Shaft Calculator. This report doesn’t concern power losses in the different joints because there were no such general equations to be found. The most common way to calculate the power losses inside a joint is to do tests were the power loss is measured at different angles, torque and speed and then use that data to put together an approximated equation.


Most of the work on this project has been on theory studies and on programming. The main result of the project is the program Propeller Shaft Calculator.


Propeller Shaft Calculator is a program that is designed in Microsoft Excel. All the menus are programmed in the visual basic editor in Excel. The program is supposed to be used as a help while designing new propeller shafts.


Propeller Shaft Calculator can calculate all the coordinates, lengths, angles and directions on a propeller shaft. It also calculates natural frequencies, plunge, estimated power loss on the second shaft and angles in the joints. In the program you can choose to do calculations on four different configurations of propeller shafts but can quite
easy upgrade the program with more choices.


Basically the program works like this:
First you choose the right propeller shaft in the main menu. Then you fill out the indata sheet with coordinates, lengths, material data and so on. As you type in the input data the output data will appear in the out-data sheet next to the in-data. Every propeller shaft has also a calculations sheet were more detailed calculations can be found. The program also has a built in help function and a warning function that lights a warning sign next to the values if they are outside the limits.
Source: Jönköping University
Authors: Fredriksson, Robert | Trkulja, Milovan


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Thermoeconomic Analysis and Optimisation of Air-Based Bottoming Cycles for Water-Free Hybrid Solar Gas-Turbine Power Plants (Mechanical Project)

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The growing worldwide energy demand and the impacts of climate change due to anthropogenic greenhouse gases emissions are among the major issues facing humanity. The global energy system, responsible for most of the greenhouse gases emissions, is therefore at the heart of global concerns. In particular, the search for a reliable, sustainable and environmentally friendly means of generating electricity is a crucial matter, with growing worries about the scarcity of fossil resources, air pollution and water acidification.


For these reasons, alternatives for the sustainable production of electricity are to be found.Among the plethora of alternatives available, concentrated solar power (CSP) appears as one of the most favourable options. The stability and dispatchability of production achievable by the integration of storage and fuel-solar hybridisation are amidst the major advantages of this technology.


Nevertheless, conventional CSP plants are based on stream-turbine cycles which consume large amounts of water. In addition to the low thermodynamic efficiency of this type of cycle, the installation of such plants in water-scarce areas is complicated by their reliance on water resources. Thus, the study of new concepts that overcome these drawbacks is necessary for the future of this technology. The availability of high temperature solar receivers for solar tower systems opens the way for the use of gas-turbines in hybrid solar-natural gas configurations. In order to increase the efficiency of the cycle while keeping the water consumption as low as possible, a promising alternative to the recovery of the waste heat in steam-turbines is to use a low-temperature intercooled-recuperated gas-turbine cycle.


This work focuses on the analysis and optimisation of the performance of an innovative hybrid solar gas-turbine power plant with an air-based bottoming cycle (ABHSGT). The evaluation considers thermodynamic performance, economic viability and environmental impact as interrelated concerns. With this in mind, detailed steady-state and dynamic models of the power plant have been developed and validated by comparison with existing components. A second model without bottoming cycle has been built for comparison. A multi-objective optimisation using an evolutionary algorithm has then been performed, optimising both capital cost and specific CO2 emissions and resulting in a Pareto-optimal set of possible designs.


The analysis of the trade-off curves resulting from the optimisation reveals promising outcomes. The global minimum for the levelised cost of electricity, found at relatively high solar shares, proves the economic potential of the technology. The integration of the bottoming cycle decreases significantly the levelised cost of electricity and the CO2 emissions of the system compared to the reference plant, and higher efficiencies are achieved.


The optimal design selected for an in-depth thermoeconomic and environmental analysis exhibits a levelised cost of electricity of 109 [USD/MWhe] for a solar share of 20% and an overall exergetic efficiency 38.5%. The specific CO2 emissions are reduced by 33% compared to simple gas-fired power plant. The water consumption is kept at very low levels compared to other CSP plants, making the system suitable for the deployment in water-scarce areas.


In addition, the environmental impact induced by the land use requirements is considerably lower than that of other renewable energy technologies. The sensitivity analysis performed to assess the consequence of changes in varying financial conditions on the levelised cost of electricity and the net present value reveals that the system studied represents a profitable investment in the presence of feed-in tariffs.In the light of the performance obtained in the three aspects considered (thermodynamic, economic and environmental), it can be concluded that the ABHSGT represents a promising alternative to other renewable energy technologies, especially in water-scarce areas.
Source: KTH
Author: Sandoz, Raphael


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Polygeneration system based on low temperature solid oxide fuel cell/micro gas turbine hybrid system (Mechanical Project)

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Polygeneration systems attract attention recently because of their high efficiency and low emission compare to the conventional power generation technology. Three different polygeneration systems based on low temperature solid oxide fuel cell, atmospheric solid oxide fuel cell/ micro gas turbine, and pressurized solid oxide fuel cell/ micro gas turbine are mathematically modeled in this study using MATLAB (version 7.12.0.635).


These systems are designed to provide space heating, cooling and hot domestic water simultaneously. This report provides the design aspects of such systems. Furthermore, the effects of some important operating properties on the polygeneration systems performance are investigated.
Source: KTH
Author: Samavati, Mahrokh


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Comparison of different Line Source Model approaches for analysis of Thermal Response Test in a U-pipe Borehole heat Exchanger (Mechanical Project)

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Ground Source Heat Pumps (GHSPs) is a relevant application and around 3 million installations are setting up at the beginning of 2010 (IEA ECES Annex 21). The improvements in GSHPs are currently focused on the optimization of the system and the reduction of costs installations. The thermal conductivity of the ground and thermal resistance of the Borehole Heat Exchanger (BHE) are important design parameters for Borehole Thermal Energy Storage (BTES) systems.


The Thermal Response Test (TRT), which has been used up to now in the GHE design, only allows estimating mean values for thermal conductivity of the surrounding ground and borehole resistance. However, the ground thermal conductivity and borehole thermal resistance may present local variation along the borehole depth.


For improving conventional TRT, the optical fiber technology is applied to collect information about the temperature profiles in the borehole. Thermal Response Test (TRT) logs the inlet and outlet fluid temperatures; meanwhile, the Distributed Thermal Response Test (DTRT) carries out a profile of the temperature along the borehole depth, in this case with fiber optic cables.


This project focuses on the comparison and analysis of DTRT measurements in a U-pipe borehole in order to estimate the thermal conductivity and the borehole thermal resistance along the borehole. The comparison and the analysis are carried out by:


• Comparing the differences of TRT results depending on the heat power rate considered – constant and by steps.


• Comparing the results from two different resolution Distributed Test Sensing (DTS) equipments: Halo and Sentinel DTS.


• Comparing the differences of TRT results as depending on the analytical procedure based on the line source theory: line source model and line source approximation.
Source: Linnaeus University
Author: Gallardo Salas, Carlos | Extremera Sánchez, Adrián


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Optimization as a Thermodynamic System (Mechanical Project)

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As we know that nature made the things optimized in all point of views, also it is supposed that nature works under some evolutionary process. Since there was no such Evolutionary Structural Optimization (ESO) method having strong mathematical background, that’s why these are not much reliable. The purpose of this thesis work is a little effort to introduce such an ESO method having a strong mathematical background.


In this study work Optimization as a thermodynamic system, we are introducing a new method for topology optimization by using concept of Free Energy and Dissipation Potential from non-smooth thermodynamics system. For better understanding we may call it as Evolutionary Structural Topology Optimization (ESTO), and this project work is done in the following steps.


An evolution problem is formulated in terms of free energy and dissipation potential for a non-smooth thermodynamical system. Free energy is taken as an objective function for a general structural optimization problem.


Derivation of a well posed evolution problem for which evolution is such that objective function always decreases. An optimality criteria method is derived for given evolution problem and it is implemented in a FEM program TRINITAS. And the behaviour of the so called evolutionary parameters such as Forward and Backward plastic constants is analyzed.
Source: Linköping University
Author: Asghar, Raja Babar


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Cluster Control of a Multi-Robot Tracking Network and Tracking Geometry Optimization (Mechanical Project)

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The position of a moving object can be tracked in numerous ways, the simplest of which is to use a single static sensor. However, the information from a single sensor cannot be verified and may not be reliable without performing multiple measurements of the same object. When multiple static sensors are used, each sensor need only take a single measurement which can be combined with other sensor measurements to produce a more accurate position estimate.


Work has been done to develop sensors that move with the tracked object, such as relative positioning, but this research takes this concept one step further; this dissertation presents a novel, highly capable strategy for utilizing a multi-robot network to track a moving target. The method optimizes the configuration of mobile tracking stations in order to produce the position estimate for a target object that yields the smallest estimation error, even when the sensor performance varies.


The simulations and experiments presented here verify that the optimization process works in the real world, even under changing conditions and noisy sensor data. This demonstrates a simple, robust system that can accurately follow a moving object, as illustrated by results from both simulations and physical experiments. Further, the optimization led to a 6% improvement in the target location estimate over the non-optimized worst-case scenario tested with identical sensors at the nominal fixed radius distance of 2.83 m and even more significant improvements of over 90% at larger radial distances.


This method can be applied to a wider variety of conditions than current methods since it does not require a Kalman filter and is able to find an optimal solution for the fixed radius case. To make this optimization method even more useful, it is proposed to extend the mathematical framework to n robots and extend the mathematical framework to three dimensions. It is also proposed to combine the effect of position uncertainty in the tracking system with position uncertainty of the tracking stations themselves in the analysis in order to better account for real-world conditions.


Additionally, testing should be extended to different platforms with different sensors to further explore the applicability of this optimization method. Finally, it is proposed to modify the optimization method to compensate for the dynamics of the system so that sensor systems could move into an intercept course that would result in the optimal configuration about the tracked object at the desired time step. These proposals would result in a more applicable and robust system than is currently available.
Source: Santa Clara University
Author: Jasmine Cashbaugh


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3-Axis Automated Probe Traverse for Aerodynamic Testing (Mechanical Project)

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Our primary objective is to design, build, and test an automated traverse to hold measurement probes in Cal Poly’s low speed wind tunnel. The device should cause minimal flow disturbance. It’s movements must be able to cover eighty percent of the three-dimensional test section.


The device should have a mounting point for interchangeable probes. The assembly is to be integrated with the current frame structure on the wind tunnel test section, and should allow very minimal deflection of the measurement probe. The user should be able to control the motion of the traverse via a computer interface which supports automatic data collection. The cost of this project must remain under two-thousand dollars.
Source: California Polytechnic State University
Authors: Tananant Boonya-ananta | Ricky Wai | Zander Oostman | Teyvon Brooks


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Comparative Study of Fragment Geometries (Mechancial Project)

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Fragments from explosive device have been and still are a great threat, but has now changed into terrorist attacks involving IED (Improvised Explosive Devise) rather than hostile forces.


This study will show the effects on concrete plates (50 mm depth) impacted by different projectiles, which should replicate fragments hitting buildings. The projectiles used were the 8 mm sphere, the 6 mm sphere, the 8 mm cylinder (RCC) and the FSP (fragment simulating projectile). The thesis was made at request from FOI (Swedish Research Defiance Agency) at Grindsjön and it contains both experiments made there and numerical simulations.


The experiments were conducted at Grindsjön, the projectile were fired in velocities between 800 m/s and 1600 m/s. The 8 mm and RCC obtains higher penetration depth at lower velocity, while the FSP, due to its soft material, will need much higher velocity. Full penetration was obtained at 1510 m/s for the 6 mm sphere, 1310 m/s for the 8 mm sphere and 950 m/s for the RCC.


The simulations were made in LS-DYNA using a meshfree solver (SPH) and the results shows that the RCC creates a bigger initial elastic wave, which will make the concrete block crack more, but it will also make the projectile lose more kinetic energy resulting in lower penetration depth in the concrete. The spherical projectiles have higher penetration depth, but it gives smaller elastic waves resulting in less cracking of the concrete.


The simulations overestimate the penetration depth for the non-flat projectiles while giving good agreements for the flat projectiles, also the damage pattern are consistent with the experiments. An actual fragment from a grenade was obtained and simulated showing that all of the projectile except the RCC shows good agreements and therefore the RCC should not be used in simulating fragments.
Source: KTH
Author: Sedlak, Michal


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Design of Parametric Winglets and Wing tip devices: A Conceptual Design Approach (Mechanical Project)

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Winglets being a small structure play an important role in reducing the induced drag in aircraft. Many types of winglets have been designed and their significance in reducing the drag is published. One of the main objectives of this work is to study about the winglet design and about their contribution in reducing induced drag.


A brief overview of wing tip devices and their performance from the manufacturers as well as from airliner’s point of view are discussed. Moreover, the role of winglet in reducing the drag of commercial civil jet aircraft is studied and the percentage of drag reduction is calculated by a conceptual approach. A320 specifications are taken to perform induced drag reduction calculation with and without winglets. Indeed, the total drag count reduced with the help of winglets accounts for additional payload which will be an advantage for the aircraft operator.


Reducing the process time in design is one of the important criteria for any field and hence automation with help of CAD tools is very significant in reducing time. This study also aims at developing an automated model for different types of winglets and wing tip devices with the help of CAD technology focused on reducing design time during the initial design process.  Knowledge based approach is used in this work and all the models are parameterized so each model could be varied with associated parameters.


The generic model created would take different shapes and switches between different types of wing tip devices as per the user’s requirement with the help of available parameters. Knowledge Pattern (KP) approach is used to develop the automation process. User Defined Features (UDFs) are created for each type of winglet and tip devices. CATIA V5 R18 software is used to develop the models of winglets and tip devices.
Source: Linköping University
Author: Rajendran, Saravanan


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Assessment of Humidity Management Effects on PEM Fuel Cell Performance (Mechanical Project)

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The electrical energy output and the performance of a PEM fuel cell is dependent on the ion transfer in the fuel cell. The ion transport mechanism in the electrolyte cell membrane is dependent on the charge site in the membrane.


The charge sites increases with an increase in the hydration of the membrane, this shows that the water content of the membrane is important to facilitate the ion transfer in the electrolyte membrane, hence proper management of water is essential to the operation of the PEM fuel cell system, to achieve these a proper balance of the water transport within the PEM fuel cell is needed for the optimum operation of the PEM fuel cell membrane.


This work is based on an assessment of the humidity management effect on the performance of the PEM fuel cell. If the fuel cell membrane is over hydrated with water, it results in over flooding of cell membrane, which causes activation losses and H+ ion cross over losses in the fuel cell, and if the membrane is poorly hydrated it results in poor hydration of the membrane which causes concentration loss, and very low ion conductivity.


The water balance system of the fuel cell is such that water vapour is present in the air at the inlet, the water is also used for H+ ion transport from the anode to the cathode, the excess water in the cathode is back diffused in to the anode, at the cathode it is also produced from the chemical reaction of the fuel cell, at the exits water it is evaporated at both the anode and cathode of the cell, and finally with the use of water mass balance we determine the mass of the water which is injected into the fuel cell to meet up the water demand for the hydration of the membrane.


This work analyses how these parameters, the operating temperature, relative humidity of air, the inlet temperature, the pressure drop in the cell membrane, the operating temperature, the membrane thickness and the stoichiometry of air affects the water content of the cell membrane. The results from this work showed that a proper management of the PEM fuel cell is of central importance to control the membrane hydration and ensure proper performance of the fuel cell.
Source: KTH
Author: Osamudiamen Ose Micah, Ose Micah


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Topology Optimization of Gear shifter Housing and Contact Benchmarks (Mechanical Project)

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In automotive component design criteria such as weight, strength, stiffness, manufacturing cost are sensitive issues for boosting its performance which in turn has direct impact on fuel economy and cost.


This thesis deals with the design of gear shifter housing for Volkswagen car by using modern topology optimization techniques to the existing design. gear shifter housing holds the shifting mechanism and guides the lever to select the respective gear for different speed. Optimizing the design in terms of topology, material and structural is very important in arriving at practical solution.


To determine the optimum material layout distribution of material within the component with given set of loads and boundary conditions by placing a constrain on volume by minimizing sum of weighted compliance as well as maximizing lowest eigen value frequency. The process starts by applying loads to the gear shifter and constraining it in all directions thereby making the gear shifter a stiff design which can withstand loads from all direction. Boundary conditions play a major role in designing the component geometry.


Contact formulation has been complex task from several years. Optimization with contact for minimizing the volume by maintaining uniform deformation between contact surfaces between two commercial softwares, HyperWorks V10.0 and TOPO4ABQ has been compared with benchmarks.


By using these techniques weight reduction has been achieved in automobile gear shifter housing and benchmarks with contact condition had been compared using Altair OptiStruct V10.0 and TOPO4ABQ by Niclas Strömberg.
Source: Jönköping University
Author: Kalidindi, Naresh | Fardmoshiri, Mohamad


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Design Automation System-Supporting Documentation and Management (Mechanical Project)

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During the practical use of Design Automation (DA) System in a company, the lack of assistance from either documentation work about the whole system or management of knowledge could bring out some obstacles when engineers reuse existing knowledge and information.


The purpose of this project is to explore an approach of documentation and knowledge management in DA System. The study is mainly based on the actual case of seat heater DA system developed by JTH.


Based on preset functional requirement for the potential solution, several principles and methods of documentation and knowledge management are introduced such as MOKA, CommonKADS, SysML and PVM. A number of useful applications such as DRed (Design Rationale Editor), PC PACK, Sementic MediaWiki and Product Model Manager became candidates solutions for this project.


The selection of final approach was Sementic MediaWiki, and this is based on the comparison of the result from evaluation of functionality of each application.


Due to specificity of documentation on the DA system, the “process based” approa­ch­ had been used for structuring system included knowledge instead of using a systematical method like either MOKA or CommonKADS completely. Setting up interconnection between different knowledge objects was one of the most important tasks in this project because it enables capturing and retrieving of knowledge.


Sementic MediaWiki, a powerful text representative and web-based tool has been used as a platform of representing the whole knowledge and information. With its implementation, the performance of Sementic MediaWiki had been tested accor­ding to the preset functional requirement. After a slight refine process to the solution, the satisfactory result had been achieved, and also proved the applicability of Sementic Wiki in such kind of project.
Source: Jönköping University
Author: Nan, Jie | Li, Qian


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Elaboration of Thermo-Economic Models of Solar Gas-Turbine Power Plants (Mechanical Project)

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For the short and mid-term outlooks a reduced grow rate in the worlds energy demand is unlikely. The increased demand for fossil resources will therefore be accompanied by further growing operating prices for conventional power plants, eventually paving the way for commercially competitive renewable energy sources. To make these new technologies ready for development , early staged research and development are critical.
Author: Russ, Matthias
Source: KTH


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Evaluation of Experimental Forced Response Data of a Turbine Stage with Respect to different Stator Blade Damages (Mechanical Project)

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This thesis work is based on the evaluation of experimental forced response data of a turbine stage with respect to different excitation sources. Six stator blade configurations are considered with three types of damage blades, i.e. triangular, rectangular and quadrilateral damages arranged at different positions around the circumference of the stator ring.


Post processing routines are developed to evaluate the forced response data of all the sensors attached to the rotor disk for all configurations and at different stator positions. Methods for averaging of the pressure data have been proposed.


Unsteady pressure distribution around blade surface is computed using the forced response from each sensor mounted on the blade. Important task is to verify the principle of superposition for configuration 05 and 06 by taking into account the single damage pattern from configurations 02-04. This principle has been verified in this thesis.


A method has been proposed for the scaling of the unsteady pressure distribution for different damage sizes of same type based on some size parameter, based on which forced response for any size of damage blade can be deduced. Finally, the thesis concludes with a detail sensitivity study and discussion of the results together with proposed future work.
Source: KTH
Author: Rajput, Moeen Ud Din Saeed


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