scholarly journals Energy Harvesting from Vehicle Suspension System by Piezoelectric Harvester

2019 ◽  
Vol 2019 ◽  
pp. 1-10
Author(s):  
Zhen Zhao ◽  
Tie Wang ◽  
Baifu Zhang ◽  
Jinhong Shi
Keyword(s):  
Energy Harvesting ◽  
Degrees Of Freedom ◽  
Inertial Mass ◽  
Vehicle Suspension ◽  
Roughness Coefficient ◽  
Generation Model ◽  
Vehicle Speed ◽  
Suspension Systems ◽  
Suspension Model ◽  
Piezoelectric Harvester

In this paper, a new type of piezoelectric harvester for vehicle suspension systems is designed and presented that addresses the current problems of low energy density, vibration energy dissipation, and reduced energy harvesting efficiency in current technologies. A new dual-mass, two degrees of freedom (2-DOF), suspension dynamic model for the harvester was developed for the inertial mass and the force of the energy conversion component by combining with the piezoelectric power generation model, the rotor dynamics model, and the traditional 2-DOF suspension model. The influence of factors such as vehicle speed, the parameters of the harvester, and road classification on the root mean square (RMS) of the generated electric power is discussed. The results show that the RMS increases with the increase of the speed of the vehicle, the thickness and length of piezoelectric patches and magnetic slabs, and the residual flux density of magnets and road roughness coefficient and with the decrease of the width of piezoelectric patches and magnetic slabs and the space between the stator ring and the rotator ring. In the present research, a power of up to 332.4 W was harvested. The proposed model provides a powerful reference for future studies of energy harvesting from vehicle suspension systems.

Finite Element Quarter Vehicle Suspension Model under Periodic Bump and Sinusoidal Road Excitation

2018 ◽  
Vol 880 ◽  
pp. 163-170
Author(s):  
Ștefan Cristian Castravete ◽  
Gabriel Cătălin Marinescu ◽  
Nicolae Dumitru ◽  
Oana Victoria Oţăt
Keyword(s):  
Finite Element ◽  
Degrees Of Freedom ◽  
Element Model ◽  
Finite Model ◽  
Vehicle Speed ◽  
Element Analysis ◽  
Car Suspension ◽  
The Finite Element Analysis ◽  
Road Excitation ◽  
Suspension Model

The paper studies the behavior of a quarter-car suspension model under periodic road excitation: sinusoidal and bump (trapezoidal shape) for a constant vehicle speed. A theoretical and a finite element model were developed. The theoretical model has two degrees of freedom and a modal and sinusoidal excitation was performed to compare with finite model analysis. The finite element analysis consists of three parts: preload, modal analysis and deterministic external excitation. The study consists of the analysis of forces, displacements and accelerations that are transmitted to the vehicle regarding their variation in time and frequency.

Control of Maglev Suspension Systems

1996 ◽  
Vol 2 (3) ◽  
pp. 349-368 ◽  
Author(s):  
Y. Cai ◽  
S.S. Chen
Keyword(s):  
Degrees Of Freedom ◽  
Ride Comfort ◽  
Vehicle Suspension ◽  
Semiactive Control ◽  
One Dimensional ◽  
Suspension Systems ◽  
Maglev Vehicle ◽  
Power Spectral ◽  
Power Spectral Densities ◽  
Control Designs

This study investigates alternate designs for control of maglev vehicle suspension systems. Active and semiactive control-law designs are introduced into primary and secondary suspensions of maglev vehi cles. A one-dimensional vehicle with two degrees of freedom, simulating the German Transrapid Magiev System, is used. The transient and frequency responses of suspension systems and power spectral densities of vehicle accelerations are calculated to evaluate different control designs. The results show that both active and semiactive control designs improve vehicle response and provide acceptable ride comfort for maglev systems.

Active Suspension Control via Redundant Actuation

2004 ◽  
Author(s):  
Robert A. Freeman
Keyword(s):  
Degrees Of Freedom ◽  
Frontal Plane ◽  
Redundant Actuation ◽  
Suspension Systems ◽  
Stiffness Model ◽  
Suspension Control ◽  
Redundantly Actuated ◽  
Automotive Suspension ◽  
Suspension Model ◽  
And Control

The use of redundant actuation in the design and control of active automotive suspension systems is described. Redundantly actuated systems consist of more active force / torque inputs than degrees-of-freedom and allow for active control of the effective stiffness of the system to the environment without a change in the equilibrium position. A frontal plane half-car, double A-arm, independent suspension model is investigated. Results show that five actuators, with one connecting the two suspensions, is required for full stiffness and motion control. Due to the dependence of this approach on correct stiffness modeling a previously developed stiffness model is reviewed. The validity of this model is illustrated through some simple yet sufficient examples.

Sliding Mode Control for Vibration Comfort Improvement of a 7-DOF Nonlinear Active Vehicle Suspension Model

2019 ◽  
Vol 31 (1) ◽  
pp. 95-103 ◽  
Author(s):  
Zhiyong Yang ◽  
Shan Liang ◽  
Yu Zhou ◽  
Di Zhao ◽  
◽  
...  
Keyword(s):  
Sliding Mode Control ◽  
Ride Comfort ◽  
Control Method ◽  
Sliding Mode ◽  
Vehicle Suspension ◽  
Suspension Systems ◽  
Mode Control ◽  
Before And After ◽  
Nonlinear Vibration Control ◽  
Suspension Model

Owing to the presence of nonlinear elements of a vehicle, when the vehicle goes through a rough-road-surface, such as consecutive speed control humps (SCHs), unexpected vibrations will exist in vehicle suspension systems, such as chaos, bifurcation, and quasi-periodic so on. In this paper, we first study the possibility of chaotic vibration of the seven degree-of-freedom (7-DOF) full vehicle model under consecutive SCHs on the highway. Then, a non-chattering sliding mode control method is proposed. The effectiveness of the sliding mode control method for the nonlinear vibration control of the vehicle suspension model is verified by numerical simulation. By comparing the changes in the vibration amplitude of the vehicle in the same velocity region before and after the control, we determine whether the ride comfort is improved. The results show that not only is the system’s chaos vibration effectively controlled, but also the ride comfort is significantly improved. The results can be applied in the design of a vehicle and in pavement of road humps.

Chaos Control of Vehicle Nonlinear Suspension System with Multi-Frequency Excitations by Nonlinear Feedback

2011 ◽  
Vol 55-57 ◽  
pp. 1156-1161
Author(s):  
Jing Yue Wang ◽  
Hao Tian Wang ◽  
Li Min Zheng
Keyword(s):  
Degrees Of Freedom ◽  
Ride Comfort ◽  
Control Method ◽  
Chaotic Behavior ◽  
Time History ◽  
Suspension System ◽  
Vehicle Suspension ◽  
Nonlinear Feedback ◽  
Suspension Model ◽  
Vehicle Suspension System

Vehicle suspension system with hysteretic nonlinearity has obvious nonlinear characteristics, which directly cause the system to the possibility of existence of bifurcation and chaos. Two degrees of freedom for the 1/4 body suspension model is established and the behavior of the system under road multi-frequency excitations is analyzed. In the paper, it reveals the existence of chaos in the system with the Poincaré map, phase diagram, time history graph, and its chaotic behavior is controlled by nonlinear feedback. Numerical simulation shows the effectiveness and feasibility of the control method with improved ride comfort. The results may supply theoretical bases for the analysis and optimal design of the vehicle suspension system.

Influence of Vehicle Suspension System on Ride Comfort

2011 ◽  
Vol 141 ◽  
pp. 319-322
Author(s):  
Jun Zhong Xia ◽  
Zong Po Ma ◽  
Shu Min Li ◽  
Xiang Bi An
Keyword(s):  
Degrees Of Freedom ◽  
Ride Comfort ◽  
Suspension System ◽  
Vehicle Suspension ◽  
Vehicle Model ◽  
Active Suspensions ◽  
Suspension Systems ◽  
Non Linear ◽  
Vehicle Suspension System

This paper focuses on the influence of various vehicle suspension systems on ride comfort. A vehicle model with eight degrees of freedom is introduced. With this model, various types of non-linear suspensions such as active and semi-active suspensions are investigated. From this investigation, we draw the conclusion that the active and semi-active suspensions models are beneficial for ride comfort.

The Application of Bond Graph Theory on Automobiles Modeling

2011 ◽  
Vol 120 ◽  
pp. 339-342
Author(s):  
Chuan Yin Tang ◽  
Xin Yu Hou ◽  
Hua Yin ◽  
Ying Zhang
Keyword(s):  
Graph Theory ◽  
Differential Equations ◽  
Degrees Of Freedom ◽  
Digital Simulation ◽  
Bond Graph ◽  
State Equation ◽  
Vehicle Suspension ◽  
Bond Graphs ◽  
Suspension Model ◽  
Bond Graph Theory

Based on the bond graph theory, the acquisition of state equation of vehicle suspension is presented. Set an example to a five degrees of freedom vehicle suspension model ,the simulated results are obtained with the aid of Matlab/Simulink software. Bond graphs are equation based , and are superior to traditional differential equations, they can provide the dynamic digital simulation in time and frequency domain, they can present the static simulation and omit the transition and class-decreasing process which is needed for traditional differential equations.

scholarly journals Optimization of a Tunable Piezoelectric Harvester Applied to Multimodal Structures

2016 ◽  
Vol 1 (1) ◽  
Author(s):  
Stella Brach ◽  
Giovanni Caruso ◽  
Giuseppe Vairo
Keyword(s):  
Energy Harvesting ◽  
Degrees Of Freedom ◽  
Piezoelectric Materials ◽  
Electric Circuit ◽  
Portable Devices ◽  
Vibration Source ◽  
Vibration Modes ◽  
Resonance Frequencies ◽  
Constant Growth ◽  
Piezoelectric Harvester

The field of energy harvesting experienced a constant growth in the last years, due to the possibility of developing standing-alone wireless portable devices with extended life. In this context, piezoelectric materials appear to be particularly effective for the development of harvesters able to scavenge energy from ambient vibrations. In this paper a piezoactuated cantilever beam used for energy harvesting purposes is considered, extracting energy from a vibration source applied at the clamped boundary. The piezoelectric dimensions and position are optimized in order to maximize the coupling on the vibration modes of interest. An electric circuit containing a resistor and an inductor, connected to the piezoelectric electrodes, is optimized, for extracting the maximum electric power for any frequency of the vibration source, accounting for several vibration modes of the structure. The inductance is used to compensate the presence of a mistuning between the vibration source and the cantilever resonance frequencies. Proposed analysis shows that a single inductance is much effective when the harvester can be treated essentially as a single-degree-of-freedom structure. For harvesters with multiple degrees-of-freedom a single inductance can perform only a trade-off compensation of the mistuning between the various modes.

Ride Dynamics

2018 ◽  
pp. 228-265
Author(s):  
David J. N. Limebeer ◽  
Matteo Massaro
Keyword(s):  
Frequency Response ◽  
Mode Shapes ◽  
Vehicle Suspension ◽  
Single Track ◽  
Response Characteristics ◽  
Suspension Systems ◽  
Frequency Response Characteristics ◽  
Suspension Model ◽  
Passive Circuit ◽  
Two Degree Of Freedom

Chapter 6 dealswith road surfacemodelling and vehicle suspension systems, and their ride dynamics. A wide variety of car and motorcycle suspension configurations are now available. While most of these systems appear ‘very different’ from each other, many of their important properties can be analysed within a common ride-dynamics framework.The chapter begins with an analysis of the simple two-degree-of-freedom single-wheel-station (quarter-car) model.The validity of this model is discussed, and several of its properties studied, including its mode shapes, its invariant equation and the associated interpolation constraints, its frequency response characteristics, its design compromises, and its suspension component-value optimization.The singletrack suspensionmodel that can be used formotorcycles, and single-track carmodels, is then discussed, while in the last part of the chapter a full-vehicle suspension model is considered. The chapter finishes with some introductory remarks relating to suspension synthesis from a passive circuit-theoretic perspective.

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