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Implementation Of Manifold Bridge Tuning For Noise Control Of An Automotive Intake System., Colin Novak
Implementation Of Manifold Bridge Tuning For Noise Control Of An Automotive Intake System., Colin Novak
Electronic Theses and Dissertations
The considerable effort invested by automobile manufacturers to attenuate various noise sources within the passenger compartment has resulted in other sources such as induction noise having become more noticeable. This study was undertaken to investigate the feasability of using a non conventional noise cancellation technique to improve the acoustic performance of the induction system by introducing exhaust noise into the intake system through a manifold bridge. The effectiveness of this technique was first investigated using Ricardo Wave, a computational, engine simulation, software program. Using a one-dimensional, finite-difference approach to analyse the dynamics of the pressure waves, mass flows, and energy …
Vehicle Interior Sound And Vibration Numerical Estimation Method Based On Engine Radiated Sound And Mount Vibration, Nikolina Kojovic
Vehicle Interior Sound And Vibration Numerical Estimation Method Based On Engine Radiated Sound And Mount Vibration, Nikolina Kojovic
Electronic Theses and Dissertations
A study was undertaken to develop a numerical estimation method for vehicle interior sound and vibration based on 5.4L V8 engine radiated sound and mount vibration and to quantify the contributions of vibroacoustic paths to vehicle interior sound and vibration. The modal analysis included acoustic and mechanical excitation of the frame and body assembly of a light truck. It was performed to estimate the sound and vibration transmission characteristics from the engine compartment to vehicle interior. The respective frequency response functions were then combined with frequency based source (engine radiated sound and forces transmitted through the mounts) data to estimate …
Vibration Fatigue Assessment Finite Element Analysis And Test Correlation, Ziad A. Hanna
Vibration Fatigue Assessment Finite Element Analysis And Test Correlation, Ziad A. Hanna
Electronic Theses and Dissertations
During the design process of a new component, it is necessary to investigate its resistance to fatigue. Fatigue life assessment techniques can use experimental and/or modeling approaches. Conducting fatigue experimental test is time consuming and in most cases expensive. On the other hand, modeling approaches are fast and economical. However, there is still a need to calibrate a model to experimental finding before conducting parametric studies on fatigue performance results. In most cases fatigue life assessment is conducted in conjunction with finite element methods. The model of a component is developed to calculate the stress/strain distribution. Because fatigue life assessment …
Assessing The Accuracy Of Peak And Cumulative Low Back Analyses When Human Anthropometry Is Scaled In A Virtual Environment., Christina Godin
Assessing The Accuracy Of Peak And Cumulative Low Back Analyses When Human Anthropometry Is Scaled In A Virtual Environment., Christina Godin
Electronic Theses and Dissertations
This study addressed the effect of scaling subjects in a virtual reality environment when performing ergonomic evaluations for assembly automotive tasks. Ten male and ten female automotive employees participated in this study. Subjects were selected to fit into one of 4 anthropometric groups (n=5/group); 5th percentile female (5F), 50th percentile female (50F), 50th percentile male (50M), or 95th percentile male (95M). Each subject was asked to perform 3 automotive assembly tasks while interacting with a digital rendering of a vehicle in virtual reality. The subjects were represented in virtual reality as a human manikin (Classic Jack, UGS) whose actions were …
Optimal Control For Electrical Power-Assisted Steering System., Xiaoqun Chen
Optimal Control For Electrical Power-Assisted Steering System., Xiaoqun Chen
Electronic Theses and Dissertations
An electric power-assisted steering (EPS) system has been gradually used to replace hydraulic power steering (HPS) in recent years. In an EPS system, an electric motor generates assisting steering torque to make comfortable steering operation for drivers. To achieve better driving feeling in the EPS system, there are three problems need to be addressed: Sufficient assist torque should be transferred to drivers; road roughness and road reaction torque shall be taken by the controller; system transient response shall be accelerated by the controller. Various control algorithms have been derived now, however, most of them are derived simply based on the …
Design Of A Research Engine For Homogeneous Charge Compression Ignition (Hcci) Combustion., Philip S. Zoldak
Design Of A Research Engine For Homogeneous Charge Compression Ignition (Hcci) Combustion., Philip S. Zoldak
Electronic Theses and Dissertations
The design and development of a research engine for Homogeneous Charge Compression Ignition (HCCI) combustion was performed. The objectives were; to design and build an experimental apparatus for investigation of parameters affecting control of HCCI burn in engines, to commission the HCCI burn apparatus, to establish HCCI burn of lean fuel/air mixture, and to enable data acquisition of in-cylinder pressure measurements. A simple design methodology was followed. Three different concepts were presented along with the advantages and disadvantages of each. Concept three was chosen as the best alternative based on functional objective and cost. Several parameters were identified to affect …
Water And Thermal Management Of Pem Fuel Cell Stack, Xiaochen Yu
Water And Thermal Management Of Pem Fuel Cell Stack, Xiaochen Yu
Electronic Theses and Dissertations
A water and thermal management model for a Ballard PEM fuel cell stack has been developed to investigate its performance in this thesis. A general calculation methodology has been developed to implement this model. Knowing a set of gas feeding conditions (i.e., pressure, temperature, flow rate) and stack physical conditions (i.e., channel geometry, heat transfer coefficients, operating current), the model will provide information regarding the reaction products (i.e., water and heat), stack power, stack temperature and system efficiency, thereby assisting the designer in achieving the best thermal and water management. Furthermore, if the stack undergoes a perturbation, such as the …