Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 35 for “"CAR model"”.
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On the Control Aspects of Semiactive Suspensions for Automobile Applications
… of a two-degree-of freedom quarter-car model, using passive and semi-active dampers, along with a seven-degree-of-freedom full vehicle model. The behaviors of the semi-actively suspended vehicles have been evaluated using skyhook, groundhook, and hybrid control policies, and compared …
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Design optimization of aerodynamic drag at the rear of generic passenger cars using nurbs representation
The rear geometry of a passenger car has the most significant influence on its aerodynamic characteristics. This thesis studied aerodynamic shape optimization of the rear geometry of passenger cars. The Non-uniform rational B-spline (NURBS) curve was used to represent the rear body of a generic …
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Applying Neural Networks for Tire Pressure Monitoring Systems
… the tire pressure of a vehicle tire. A quarter-car model was developed with Matlab and Simulink to generate simulated accelerometer output data. Simulation data are used to train and evaluate a recurrent neural network with long short-term memory blocks (RNN-LSTM) and a convolutional neural …
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Estimation of Disturbance Inputs to a Tire Coupled Quarter-car Suspension Test Rig
… forces, acting on the sprung mass of a quarter-car suspension test rig was generated. This information is intended for use in active control methods applied to vehicle suspensions. This estimate is achieved with two acceleration measurements as inputs to the estimator; one each on the sprung and …
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Neural network identification of quarter-car passive and active suspension systems
… of active suspension systems based on a quarter-car model with both full-state feedback and incomplete state feedback controllers to optimize the passenger ride comfort, road handling and car controlling. Linear stochastic optimal control will be employed to design an active controller in vehicle …
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Effects of stabilizer bars on road vehicle ride quality
… this study vehicle suspension and road surface models are developed to investigate the effects of such stabilizer bars on ride quality. The purpose of the research is to determine the need for further studies in the area of active roll stabilizer systems. Two dynamic vehicle models are …
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Virtual Reality Modeling of a Car Suspension with Active Control Capability
This thesis presents the evolution of a full car model into virtual reality environment to visually demonstrate the dynamics of a car resulting from various inputs controlled both passively and actively. The model is a seven degree of freedom system that can be configured to be excited by either a …
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Hierarchical Gaussian Processes for Spatially Dependent Model Selection
In this dissertation, we develop a model selection and estimation methodology for nonstationary spatial fields. Large, spatially correlated data often cover a vast geographical area. However, local spatial regions may have different mean and covariance structures. Our methodology accomplishes three …
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Control and simulation of an active suspension system
… and experimental research work has been carried out in the area of active suspensions for automotive application. A PC based digital control system and interfaces to an existing trailer with an active zero rate suspension system, sensors and electronics has been developed. The required …
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Vehicle Sprung Mass Parameter Estimation Using an Adaptive Polynomial-Chaos Method
The polynomial-chaos expansion (PCE) approach to modeling provides an estimate of the probabilistic response of a dynamic system with uncertainty in the system parameters. A novel adaptive parameter estimation method exploiting the polynomial-chaos representation of a general quarter-car model is …
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Default Risk in the Automotive Supply Network
… this dissertation is to empirically investigate, model, and estimate which features of a car-part supplier's portfolio, including production capacity, buyer or component-sector specialization, and solvency risk, drive the formation of new business relationships between this car-part supplier and a …
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Development of a Semi Active Suspension System for Lightweight Automobiles
… The goal of this research has been to design, model, fabricate and test a novel semi-active damper. The damper consists of two independent electronically controlled units placed in series with one another. The system was initially simulated using a 2 DOF quarter-car model and the performance …
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A Discrete Roughness Index for Longitudinal Road Profiles
… using parameters other than the Golden Quarter-Car on which the IRI is based. The development of the DRI begins with a consistent discretization of the terrain surface, vehicle response, and the IRI. Next the Fractional Response Coefficient is developed, the properties of which are critical in …
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A Hybrid Soft Soil Tire Model (HSSTM) For Vehicle Mobility And Deterministic Performance Analysis In Terramechanics Applications
Accurate and efficient tire models for deformable terrain operations are essential for performing vehicle simulations. Assessment of the forces and moments that occur at the tire-terrain interface, and the effect of the tire motion on properties of the terrain are crucial in understanding the …
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A Structured Approach to Defining Active Suspension Requirements
… to allow for application to different vehicle models, ride conditions and performance objectives. The current state-of-art in active suspensions was first evaluated. Based on these findings, the objectives of the simulation models and approach was defined. A quarter-car model was developed in …
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Optimal Paths in Gliding Flight
… formulated for a dynamic particle (or "kinematic car") model. The objective is to identify the path which satisfies specified boundary conditions and minimizes a particular cost. Several cost functions are considered. The problem is addressed using optimal control theory. The length scales of …
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Optimal passive nonlinear damper design methodology for road race application
… use of equations-of-motion for suspension models, assembly of equations in a computer model for simulation, identification of the objective function which maximizes lateral acceleration based on tire data, optimization of the objective function by varying damping and inertance, …
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Use of smartphones to measure pavement roughness across multiple vehicle types at different speeds
… different environments to the standard “golden car” model as used in standard IRI measurements. This study builds off of previous work whereby a smartphone app was used to collect roughness data and then analyzed via an in-house MATLAB script to produce accurate IRI measurements. For this study, …
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Analysis and Development of Control Methodologies for Semi-active Suspensions
… of control approaches are implemented on a car models using MATLAB/Simulink. The investigated control methodologies are skyhook, groundhook, hybrid skyhook-groundhook, Acceleration Driven Damper, Power Driven Damper, H∞ Robust Control, Fuzzy Logic Controller, and Inverse ANFIS. H∞ Robust …
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Modal Analysis of a Discrete Tire Model and Tire Dynamic Response Rolling Over Short Wavelength Road Profiles
… extracted using a detailed finite element model. The main issue with full modal models (FEA, for example) is the inability to integrate the tire modal model with the vehicle models to tune the suspension system for optimal ride comfort. An in-plane rigid–elastic-coupled tire model was used …
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