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 30 for “"Quarter-Car"”.
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Neural network identification of quarter-car passive and active suspension systems
… design 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 …
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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 …
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Multibody Dynamics Modeling and System Identification for a Quarter-Car Test Rig with McPherson Strut Suspension
… dynamic response and joint reaction forces of a quarter-car suspension. This need is addressed by this study through development and system identification of both a linear and a non-linear multibody dynamics McPherson strut quarter-car suspension model. Both models are developed using a method …
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Design and Adaptive Control of a Lab-based, Tire-coupled, Quarter-car Suspension Test Rig for the Accurate Re-creation of Vehicle Response
… toward a common goal. First, a state-ofthe-art quarter-car test platform has been designed and constructed to offer increased testing flexibility at a reasonable cost not found commercially. With this new test rig completed, the second objective is a proof-of-concept evaluation of a well known …
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Experimental Evaluation of Semiactive Magneto-Rheological Suspensions for Passenger Vehicles
… A full-scale two-degree-of-freedom (2DOF) quarter-car test apparatus has been constructed at the Advanced Vehicle Dynamics Lab at Virginia Tech to evaluate the response of a vehicle suspension under the different control schemes of skyhook, groundhook, and hybrid semiactive control. The …
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Combined Time and Frequency Domain Approaches to the Operational Identification of Vehicle Suspension Systems
… experimental testing and simulation. A quarter car suspension test rig is designed and built to facilitate experimental suspension system testing. A novel shock absorber force measurement set–up is developed allowing the measurement of shock absorber force under both isolated and …
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On the Control Aspects of Semiactive Suspensions for Automobile Applications
… characteristics 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 …
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Vehicle Sprung Mass Parameter Estimation Using an Adaptive Polynomial-Chaos Method
… the polynomial-chaos representation of a general quarter-car model is presented. Because the uncertainty was assumed to be concentrated in the sprung mass parameter, a novel pseudo mass matrix was developed for generating the state-space PCE model. In order to implement the PCE model in a …
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Elastodynamic Analysis of Vehicle Suspension Uprights
The ability of a Formula SAE sports car to negotiate a turn in a race is influenced by many parameters which include car's overall geometry, its shape, weight distribution, type of suspension used, spring and shock absorber characteristics that are used in the tire properties, static and dynamic …
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Dynamic Analysis of Semi-Active Control Techniques for Vehicle Applications
… policies as tested on a single suspension quarter-car system. Incorporating a magneto-rheological damper, the full-scale 2DOF quarter-car system was used to evaluate skyhook, groundhook, and hybrid control. Two alternative skyhook policies were also considered, namely displacement skyhook …
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A Discrete Roughness Index for Longitudinal Road Profiles
… and 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 …
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A Novel Method for Vibration Analysis of the Tire-Vehicle System via Frequency Based Substructuring
… techniques are applied independently to several quarter car models of varying complexity and to experimental data. These models range from a simplified spring-mass model to a generalized 3D model including rotation. Further, decoupling techniques were applied to simulations of a rigid ring tire …
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Applying Neural Networks for Tire Pressure Monitoring Systems
… identify 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 …
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Analysis of Lossless-Adjustable One-Ports: Experimental Testing, Modelling and Optimal Control
… corresponding clipped-optimal control law for a quarter-car where semi-active damper is used to provide the control action and also where both components: semi-active damper and varspring, are used simultaneously. Different simulation profiles are evaluated that represent common operating …
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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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Development of a Semi Active Suspension System for Lightweight Automobiles
… The system was initially simulated using a 2 DOF quarter-car model and the performance characteristics of the damper were outlined. Following that, multiple design iterations of the damper were created and a MATLAB/Simulink model was used to simulate physical and flow characteristics of the …
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Approximations for Nonlinear Differential Algebraic Equations to Increase Real-time Simulation Efficiency
… were compared in this research, an experimental quarter-car test rig, a multi-body dynamics differential algebraic equation model, and a linear model with nonlinear suspension elements. Models constructed from differential algebraic equations are computationally expensive to compute and are …
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A Hybrid Soft Soil Tire Model (HSSTM) For Vehicle Mobility And Deterministic Performance Analysis In Terramechanics Applications
… to the test conditions were performed on a quarter car model. The results have indicated the superiority of this model as compared to other lumped parameter models currently available.
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A Structured Approach to Defining Active Suspension Requirements
… simulation models and approach was defined. A quarter-car model was developed in Matlab to simulate the behavior of active suspensions over unilateral boundary conditions due to different road obstacle profiles. The obstacle profiles were obtained from existing standards and literature and then …
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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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