Examensarbeten för masterexamen // Master Theses
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- PostBody Torsional Stiffness - Validation & Design Optimization(2019) Ranga Ramanujam, Krishna Desigan; Seshanna, Nitish Malangi; Chalmers tekniska högskola / Institutionen för mekanik och maritima vetenskaper; Abrahamsson, Thomas; Rosell, Anneli; Puhasmagi, Henrik; Abrahamsson, ThomasThis Thesis is a validation work, wherein, the body torsional stiffness calculated from a test-rig experiment is validated against the simulations. Earlier, the body torsional stiffness was calculated in the test-rig using a Body-In-Gray (BIG) structure (see section 2.2) and this method correlated exactly with the CAE simulation method. Hence, this test-rig experiment method was stopped and the simulations were enough for evaluating the body torsional stiffness. Later, a new test-rig experiment method (current method) was introduced, in which a full-scale car model is used to evaluate the body torsional stiffness. This method was introduced mainly to measure and compare the body torsional stiffness of the competitors’ models. As this method did not correlate well with the CAE simulation, the impact of the Chassis on the BIG model is investigated. This is done to get a better correlation of the results between the simulation and the test-rig experiment. Also, to evaluate the body torsional stiffness similar to that of the test-rig method, a new simulation method is introduced during the thesis. Finally, the results from both the simulations are compared against the test-rig method to recommend the best simulation method for validating the test-rig experiment. As a second part of the thesis, a Design Optimization study is performed to reduce the weight of the BIG structure with no change in the body torsional stiffness.
- PostDevelopment of FEM-based simulation methods for facilitating the design process of electromagnetic vibration energy harvesters(2019) Eriksson, Felix; Chalmers tekniska högskola / Institutionen för mekanik och maritima vetenskaper; Abrahamsson, Thomas; Josefsson, Andreas; Abrahamsson, ThomasElectromagnetic vibration energy harvesting is an emerging technology for extracting small amounts of electrical energy from vibrations. It can be used to power sensors and data transmission equipment for monitoring industrial processes and machines in hard-to-access-places without easy access to electricity, without requiring regular replacement like batteries. Methods, models and software to aid the design process of springs for electromagnetic vibration energy harvesters have been developed in this work. It has been carried out at ReVibe Energy, a company which develops such harvesters. Previous FEM simulations of eigenfrequencies in the harvesters showed poor correspondence with experiments. To investigate this, experiments to measure sti nesses of springs were set up. This was done by suspending weights in the springs. It was found that also the stiffness of the springs corresponded poorly to finite element simulations. There were also significant differences between spring individuals that were nominally identical. Dimensional measurements were conducted on the springs, and it was found that the spring arms were generally narrower than specifed in drawings for the components. There were also arm width variations between individuals, which correspond to and explain the between-individuals stiffness variations. When simulations were performed with corrections for arm width, the stiffness prediction error was reduced by approximately 50 %. The methodology employed in designing and manufacturing springs was studied, in an effort to improve spring design while making the design work less cumbersome. With the purpose of removing manual iterative design loops, which are very time-consuming, a method for automatically generating and evaluating different spring designs was conceived. It consists of automatic changes to a CAD- file in Autodesk Inventor, export of a STEP file containing the component geometry, meshing of the component with GMSH, finite element analysis on the mesh using Elmer, and finally evaluation of results. This was implemented in a software program written in Python. Keywords: Electromagnetic vibration energy harvesting, finite element method, beam elements, parametric simulations, open source, water jet cutting, tolerances
- PostEvaluation of Head Toss Based on Sensor Data Collected from a Car on a Four-Poster Rig: A study in how to quantify, measure and replicate a subjective feeling in car ride in an objective manner using a four-poster rig(2021) Brokelind, Hugo; Thörneby, Kasper; Chalmers tekniska högskola / Institutionen för mekanik och maritima vetenskaper; Abrahamsson, Thomas; Daniel, AjayComfort development in vehicles has been a factor for a long time. Recent research examines urban driving at low speed which causes jerking motion of the car that can be unpleasant for the passengers’ necks and heads. These undesirable comfort disruptions are known as head toss. The report aims to find an objective way to measure and compare the occurrence and harshness of the subjective feeling of head toss between different cars and chassis setups. Furthermore, the aim is to measure the head toss on a 4-poster rig, commonly known as a shake rig. This was done through collection of chassis and head acceleration data and the rating of each head toss on a scale of 1-9. The relationship between head toss occurrence and chassis accelerations would show to be complex and non-linear. A design of models and tools that were able to accurately predict the occurrences and rating of head toss was therefore executed. The models that performed best was neural networks and ensemble learning models. Using these models, a program was developed which could predict the occurrence of head toss and its harshness accurately. The final result of this project thus became an experiment set up to execute a rig program in order to collect data, and a program that evaluated the collected data to display an objective evaluation of head toss.
- PostFE-analysis of bolted joints: Correlation between simulation and physical test data(2019) Stervik, Magnus; Chalmers tekniska högskola / Institutionen för mekanik och maritima vetenskaper; Abrahamsson, Thomas; Abrahamsson, ThomasA correlation problem was found in a bolted joint when results obtained by physical test were compared to simulation results of a mudguard bracket mounted on a side skirt. The simulation predicts failure in another bolt than the bolt that fails in the physical tests. New rig tests have been performed together with new simulations to find the reason of why the correlation problem is present. The investigation implies that the existing method of evaluating bolted joints capture the overall behavior of the bolts in a good way. However, the new results indicate that the slip of the bolts affects the results to a big extent. The clamping forces together with the friction do play a big part of why the simulation results predicts another outcome of which bolt that fails, when compared to the physical test. The slip that occurs at some of the bolts during the testing causes wear of the clamped components and self-loosening of the bolts which causes great loss of clamping forces. The loss of clamping force is not accounted for in the existing simulation method to the same extent, high axial stresses and bending stresses are therefore obtained in reality which causes failure in the bolts. The slip that is present in the simulation for other of the bolts, do also affect the correlation problem in ways where high bending stresses are found in the simulations compared to the physical tests. The clamping force and the friction coefficient are the two main factors of when slip is initiated, which is difficult to capture in the simulations without measurements. When these two parameters are tuned according to measurements, improved correlation is obtained.
- PostFinite Element Based Method for Investigation of Exterior Acoustics(2020) Eriksson, Olivia; Ansin, Caroline; Chalmers tekniska högskola / Institutionen för mekanik och maritima vetenskaper; Abrahamsson, ThomasA challenge with renewable energy is that the power source is time varying. To be able to supply renewable power at all hours, the company Azelio is developing a Thermal Energy Storing (TES) system. During the development, multiple design changes are made at a rapid pace. Therefore, it is important to utilize numerical tools to save time and money. Azelio’s TES system is Stirling engine based. The free mass loads in the engine causes vibrations, which make sound propagate from the system. The sound level is mostly not an issue since the system will be located in uninhabited areas, but it can be of importance if the system would be serviced during operation. That is why a numerical method for determining the exterior sound level would be of interest. The purpose is, thereby, to develop a generic method that can be used to predict exterior sound. The method will be developed for the current TES system, but should be possible to use when evaluating new designs. A numerical method for predicting the exterior far field sound level located in a free field was developed using the finite element method in Ansys Mechanical APDL. The exterior acoustics problem was solved using a one-way coupling from structure to fluid. The structural vibrations were computed through mode-superposition in a harmonic analysis, in which the system was assumed to be linear and time-invariant. The vibrations were then used to generate waves in a fluid full harmonic analysis. To validate the numerical model of the system, an experimental modal analysis was performed on the current TES system, but no measurements during operation were made. Due to the complexity of the system and time restriction, the results from the experiment lacked in correlation with the results from the finite element analysis. However, this does not say anything about the developed sound predicting method. One conclusion that can be drawn is that it is difficult to model and do experiments on a complex system. The developed method is generic and can be applied to any vibrating system. It can be used to compute the sound pressure level in a plane or a point, at various engine speeds. The sound level in a point can be compared to measurements, while the plane contour plot can be used in the development process to identify parts that radiate a lot of sound. The method was developed for a complex system and should be tested on a simpler system. To validate the method, various tests should be performed.
- PostFinite element modelling and calibration of a shake rig for durability verification(2019) Rohan, Choudhury Dipesh; Vaidya, Shruti Laxmikant; Chalmers tekniska högskola / Institutionen för mekanik och maritima vetenskaper; Abrahamsson, Thomas; Sandberg, Hjalmar; Nord, Anders; Gibanica, Mladen; Abrahamsson, ThomasThis study is about calibration of the finite element model of the 7-post durability shake rig at Volvo GTT, Lundby. The study was carried out to compare the dynamic behaviour of the physical rig with its finite element model and establish a correlation between them. The calibration is done against experimental data obtained from experimental modal analysis (EMA) by employing an optimization algorithm based on the minimization of the deviation metric between the transfer functions of the parametrized finite element model and the physical rig. The system is excited in two different setups: Hammer Test and 7-post rig test. In hammer test, force input is given while in 7-post rig test displacement input is given. Force is measured for corresponding displacement input using force transducers. Signal processing is done to experimental data. Frequency response functions are synthesized from the accelerance data of the EMA. Post-screening of the measured experimental data is done to cure test data of any errors in estimation. The system is identified using state-space method. The accuracy of the state-space model is improved by developing a MATLAB script that captured the relevant eigenmodes of the identified system. The finite element model is calibrated based on the identified state-space model. The dynamics of the calibrated model is found to be close to the physical rig. The calibrated model improved the correlation of fourth flexible eigenmode while retaining the behaviour of the first three eigenmodes.
- PostMethod development for frame design of electric motorcycles(2023) Blixt, William; Lokat, Adil; Chalmers tekniska högskola / Institutionen för mekanik och maritima vetenskaper; Chalmers University of Technology / Department of Mechanics and Maritime Sciences; Abrahamsson, Thomas; Lewandowski, Alexander; Brodén, LudvigCompliance in a motorcycle frame is an important factor to consider when designing. Different load cases must be taken into consideration depending on the requirements of the bike and what the use case is. To think of the structural characteristics when designing can make the design process simpler and quicker. Extensive studies can take time and are not always necessary in early design if simple simulations has been done through the process. Early simulations can direct the design along the way to give good structural efficiency and smart solutions when integrating components as stressed members. To also have the simulations verified and calibrated to a physical test give confidence when doing simple iterative tests early in the design phase. A method has been developed to enable iterative and fast design development of a motorcycle frame with consideration to structural characteristics, and to do this with limited access to tools. To allow for this the design must continuously consider the structural simulations to not end up with a overly complex model that requires big changes after simulating. Results show that the method used to design and simulate, can have an impact on what and how the results obtained from simulation can differ from each other and thus be less suitable for different scenarios.
- PostMethods for evaluating allowable vibration velocity levels in power plant piping systems(2019) Ringström, Marcus; Wallin, Björn; Chalmers tekniska högskola / Institutionen för mekanik och maritima vetenskaper; Abrahamsson, Thomas; Abrahamsson, ThomasVibrations in piping systems can have detrimental effects on the structural integrity, it is therefore of great importance to quantify the source of vibrations and to assess the impact of vibration induced fatigue. This thesis is limited to describe vibrations in a vibrating structure and not to investigate sources of excitation. The finite element method was used to perform modal synthesis and synthesis on three computational models with different levels of complexity. Modal analysis was performed by mode superposition which is an effective method used to approximate the dynamic response of a structure by superposition a small number of the structures eigenmodes. The main objectives in this thesis are to investigate allowable vibration velocity levels for different methods. Allowable vibration velocity levels are determined by fatigue stress data obtained from fatigue curves. The endurance limit is taken as the fatigue stress at infinite lifetime, i.e. the stress where the material does not undergo fatigue. The endurance stress is thus set as the allowable limit for vibration velocities. Natural frequencies, modal displacement and modal stresses are obtained from the dynamic response from FE-analysis. Modal analysis was performed on all models and frequency response analysis with a prescribed acceleration amplitude has been performed on the most complex computational model to obtain vibration displacement and stress amplitudes, as well as forcing frequencies. The results show that all methods show the same trend for allowable vibration velocity with the only difference being allowable vibration velocity is shifted in magnitude for different methods. The first model exhibits a clear linear frequency dependence for allowable vibration velocity while model 2 and model 3 exhibit a more non-linear behaviour with respect to allowable vibration velocity due to combinations of vibrating modes.
- PostModel reduction of finite element models applied to nonlinear squeak and rattle simulation(2019) Godborg, Filip; Valiyakath Basheer, Anoob; Chalmers tekniska högskola / Institutionen för mekanik och maritima vetenskaper; Abrahamsson, Thomas; Bayani, Mohsen; Gibanica, Mladen; Abrahamsson, ThomasHigh level of modelling details in finite element models contributes to an increase in computational cost. To deal with this, the Component Mode Synthesis can be used, which combines the principle of dynamic substructuring with techniques of model reduction. The most common Component Mode Synthesis method is the Craig-Bampton method that has been labeled as the standard method for dynamic substructuring of linear systems. However, for dynamic substructuring of nonlinear systems, no standard method has emerged as the research within the area is still at an early stage. Hence, it would be beneficial to investigate if the Craig-Bampton method can be used for squeak and rattle simulations including nonlinearities in the form of contact. This thesis aims to increase the understanding of how the Craig-Bampton method can be used for simulations including nonlinearities in the form of contact. The study is carried out on a passenger car door which is excited using three different load cases, to see the influence of different levels of contact. The substructured model is compared to the original model by using the Modal Assurance Criterion, frequency response comparison and by comparing contact force with respect to time and amplitude. Further, by gradually excluding more elements from the substructure, the thesis aims to see if the accuracy of squeak and rattle prediction can be improved by having a higher number of elements closer to the contact region. The results show that the substructured system had 97.9 % lower computational time than the original FE-model. Although it was accurate at predicting contact with respect to time, the calculated contact force amplitudes were generally higher. Neither the level of contact nor the number of elements close to the contact region had any significant effect for squeak and rattle prediction of the substructured model. The computational time is found to be dominated by the number of interface DOFs. In this case, an additional 32.5 % reduction in computational time was achieved by locally coarsening the mesh around the contact interface.
- PostNVH analysis and optimization of an electric powertrain(2022) Subramanian, Vignesh; Chalmers tekniska högskola / Institutionen för mekanik och maritima vetenskaper; Abrahamsson, Thomas; Kandasamy, RamkumarBecause of its compact shape and high power density, the permanent magnet synchronous motor (PMSM) appears to be better as a drive motor for electric construction machines (ECMs). However, as compared to conventional construction machines, the motor-driven machine has exhibited a different noise profile as a result of the shift in noise excitation source. The dramatic increase in high-frequency noises is particularly noticeable in this scenario. Furthermore, some of these highfrequency noises are distributed in the frequency range that is sensitive to human hearing, causing operators to feel highly uneasy. Furthermore, gear whine noise emitted from the electric powertrain system could significantly affect driving comfort and has become an important NVH problem. The motor’s electromagnetic forces and the reducer’s gear-meshing forces could create structural vibration and whining noise with clear order characteristics. As a result, it’s critical to look into the NVH characteristics of PMSM and reducer for ECMs. Computer-aided engineering (CAE) based vibration and sound simulation is a key approach for studying and optimizing electric powertrain NVH behavior, especially in the early stages of design. To put it another way, being able to forecast the noise and vibration harshness (NVH) behavior of an electric drive used in ECMs without having to run experimental solutions can save a company a lot of time and money.
- PostRattle predictions using linear and non-linear structural dynamics simulations(2021) Muthya, Suray Srinath; Selvaraj, Srikannan; Chalmers tekniska högskola / Institutionen för mekanik och maritima vetenskaper; Abrahamsson, Thomas; Bayani, MohsenThe purpose of this project is to study the parameters in the already developed metrics for the Squeak & rattle, which are annoying sounds in a passenger car, as a result of two surfaces sliding or due to normal impact respectively. These are indicators of poor quality and burden warranty costs to the car manufacturers. The rattle event is predicted by validating against experimental data and to compare the accuracy of the S&R risk severity metrics calculated from the linear and non-linear structural dynamics simulations. Though there is a lack of accurate simulations and post-processing methods, the methods used here helps in the evaluation of these issues in the product development process itself by virtual simulations and parameter study. A simple mechanical system is studied for the impact study and various output parameters from the experimental rattle setup are correlated with the simulation results in order to reduce the computational costs of complex setups and mass production.
- PostSimulation of stick-slip friction: Nonlinear modelling and experiment validation(2020) Nasseri, Arian; Heszler, Vince; Chalmers tekniska högskola / Institutionen för mekanik och maritima vetenskaper; Abrahamsson, ThomasA determining factor of the quality of a vehicle is the audible interior squeak and rattle (S&R) noise. This study aimed to model the friction induced stick-slip phenomenon, which is the main cause behind the squeak noise. This was done by first doing tests on a stick-slip test bench. The results gained from the experiments were processed and used for the FE model. Secondly a FE model was set up, on which a parametric investigation was done. During FE modeling an experiment postprocessing method was established and validated. Many FE cases were run, and the results were compared to the experimental ones. For the comparisons some metrics were established which can be related to the severity of the stick-slip event. The main achievement of this work was the model setup approach and the validated FE model which form the basis of the simulation and follow the experimental trends of the stick-slip phenomenon. With the help of this study engineers will be able to simulate stick-slip events in CAE environment and determine its severity early and upfront in the product development process.
- PostSub-Assemblies Correlation of a BIW Architecture: Global Modes and Main Transfer Functions(2022) Sjödin, Wilhelm; Chalmers tekniska högskola / Institutionen för mekanik och maritima vetenskaper; Abrahamsson, Thomas; Ruiz, Álvaro ValenciaThis dissertation focuses on correlation between measurement and simulation results on a Body in White (BIW). The purpose is to set up and evaluate a correlation methodology, where each sub-assembly of the car body is assessed separately to be able to localize the finite element model uncertainties. The sub-assemblies correlated in this dissertation are the Floor Rear and the Body Side Outer, of a BIW architecture. To obtain the dynamic properties of the car body, several experimental and CAE based methods are employed and evaluated. The sub-assemblies of a car body are usually connected using different joining methods, such as spot welds and adhesives. The first step is to set up two FE-models of the sub-systems, from CAD-geometries and a complete FE-model of the BIW. This is done by using ANSA as a pre-processor. Normal modes analysis (NMA) and modal frequency response analysis (MFRA) can then be utilized in MSC NASTRAN to calculate mode shapes, resonance frequencies and transfer functions. These numerical results are then used in a pre-test analysis to decide accelerometer and impact locations for the experimental modal analysis (EMA). Thus, qualitative measurement data can be obtained, capturing the dynamical behavior of the structure. Measurements are then done using an impact hammer, triaxial accelerometers, and measurement software and hardware from Müller-BBM VibroAkustik Systeme (PAK), as well as from Siemens (LMS Testlab). The correlation of the sub-assemblies focuses on physical differences between the FE-model and the manufactured parts. Uncertainties identified are the adhesives, welds, structural damping, and the thickness distributions. To quantify differences between measurement data and simulation data, and to study the sensitivity of different properties, transfer functions are analyzed. Global modes and resonance frequencies are either identified from real and imaginary parts of the transfer functions, or from experimental and analytical modal analysis. The first conclusion drawn was that when correlating sub-assemblies, the FE-model must be adapted to the current step in the manufacturing process. One example is the adhesives that are cured at a later stage in the factory, and thus the ultimate material properties cannot be applied directly using the methodology presented in this dissertation. Furthermore, conclusions on the influence of the welds, structural damping, the thickness distribution and the mass is presented in this dissertation. By correlating the car body piecewise, the sensitivities and uncertainties were localized, and could thus be analyzed in more detail. Furthermore, once the complete body is assembled the only uncertainties lies in the connections between the sub-assemblies, and not in the different sub-systems themselves. The presented methodology can thus be considered more robust than by correlating the complete body directly.
- PostTire modelling for cavity noise prediction in a complete vehicle simulation environment: Evaluation of CDTire/NVH in NVH Director(2022) Carlsson, Maja; Idoffsson, Daniel; Chalmers tekniska högskola / Institutionen för mekanik och maritima vetenskaper; Abrahamsson, Thomas; Westlund, Jonathan; Lidberg, MathiasWith an ongoing transition in industry to battery electric vehicles, interior noise will no longer be dominated by an engine sound but shift to mainly originate from road noise instead. Road noise is highly dependent on the tires however traditionally used tire models have been insufficient in accurately predicting cavity noise which is problematic due to it being highly noticeable for the customer. New tire models have arised in recent years where CDTire/NVH is one of the most prominent ones. This thesis aims to evaluate the predictive capability of CDTire/NVH in the software package NVH Director (NVHD) but also conclude whether it can be advised or not to implement it in the working procedures at Volvo Car Corporation (VCC). The evaluation was performed by comparing the performance of CDTire/NVH with the spindle load method as well as physical measurements. Primary focus of the comparisons were made on the complete vehicle, focusing on cavity noise in terms of predicted absolute values, trends and critical transfer paths. In addition to these comparisons, an evaluation of a stand alone tire were also made in order to capture the direct response. Results show that CDTire/NVH in NVHD can capture the split of the cavity modes for a stand-alone tire but with unexpected sensitivity to the load case configuration. When implemented in the complete vehicle simulation model, there are ripples in the frequency response of interface forces. Furthermore, the transfer path analysis possibilities when using CDTire/NVH in NVHD is currently more restricted and fewer than the ones available with the spindle load method. All simulation results were obtained for one tire parameterization and simplified shaker excitation was used for the stand-alone tire. Due to the challenges encountered when adding the tires to the complete vehicle model in NVHD, it was neither possible to verify the performance of CDTire/NVH in NVHD by comparison with the established spindle load method nor possible to validate the tire model against full vehicle measurements. All results obtained in this thesis were obtained with NVHD version 21.2. Consequently, it is currently not advised to VCC to implement evaluated version of CDTire/NVH in NVHD into their working procedures. However, due to the potential of using CDTire/NVH in NVHD, it is also recommended to evaluate a revised version of the software addressing the issues identified in this thesis.
- PostTransient and Spectral Fatigue Analysis for Random Base Excitation(2019) Bäckstrand, Albin; Madhava Acharya, Prithviraj; Chalmers tekniska högskola / Institutionen för mekanik och maritima vetenskaper; Abrahamsson, Thomas; Nord, Anders; Abrahamsson, ThomasThis thesis work gives an insight on how to estimate the fatigue damage using transient and spectral fatigue analysis for both uniaxial and multiaxial stress states in case of random vibration base excitation. The transient method involves a rainflow count algorithm that counts the number of cycles causing the fatigue damage, while the spectral method is based on probabilistic assumptions from which an expected value of fatigue damage can be estimated. The purpose was to compare the fatigue damage obtained from the transient and spectral approach, and evaluate the performance of the spectral method. In this study, the Dirlik’s empirical formula has been selected for the spectral method, partly because it has proven to be a good implementation in structural mechanics fatigue. In order to account multiaxial fatigue in the calculations, the authors decided to use Dang Van equivalent stress for the transient analysis. In addition to that, the cycles were counted applying Wang and Brown’s method, which can be seen as a more general extension of the original rainflow count algorithm. In the spectral analysis, the well known equivalent von Mises stress (EVMS) has been selected in order to account for multiaxial spectral analysis. The two methods were studied in association with an air dryer component that s attached to a chassis frame of a truck. The air dryer is subjected to random vibration via the mounting interface. The vibration was simulated by acceleration base excitation. Both uniaxial and multiaxial base excitation were investigated and the fatigue life was estimated in three selected hotspots on the surface of the air dryer component. The hotspots were chosen based on modal analysis. The Dirlik’s empirical formula was showing promising estimation of the fatigue life similar to the rainflow count. In most cases, the difference n fatigue life between the two methods was less than 30 % for both uniaxial and multiaxial stress. However, Dirlik’s formula was mostly showing more conservative results compared to the rainflow count. The cause of this could either be errors in the calculations or too short input signals. In some cases the difference between the methods were more significant, showing 200 % difference in fatigue life. The authors believe that this is most likely caused by mid stress effects in the Dang Van equivalent stress.
- PostWind Dynamic Assessment Methods for Medium-span Bridges: A comprehensive review of empirical and numerical approaches(2021) Ehn, Lukas; Lundell, Sven; Chalmers tekniska högskola / Institutionen för mekanik och maritima vetenskaper; Abrahamsson, Thomas; Svedholm, Christoffer; Söderström, PerGenerally, bridge engineers are unfamiliar with wind dynamics as it falls in-between the fields of structural engineering and fluid dynamics. Therefore, there is a need to summarize the field in a digestible manner. Procedures for wind dynamic assessments of medium-span bridges (e.g. bridges with longest spans of 50 to 200 metres) are investigated by studying both the current norm in Sweden, and an international alternative. A quick reference guide for wind dynamic assessment is developed, simplifying the procedure for bridge engineers. It offers significant time savings, especially in early stages of design, and it can prevent unexpected issues in later stages. However, to verify its reliability large scale testing on bridges is recommended. Additionally, possibilities of further analysis using computational fluid dynamics is investigated. Simulation data show some promising results and with further development, the methodology could provide better estimations than the norm. Conclusively, two useful tools for wind dynamic assessment of bridges are developed, and with further work, application in practice is possible for both methods.