| With the booming in the number of vehicles in China,the huge energy and environment issues have become a national strategic level of pending agenda.In response to the call for green and sustainable development,researchers have developed the research on the vehicle energy recovery.Although foreign countries have mature products and put into military use,the technical blockade made the development of this field in China still in the stage of system development and experiment,and there are many problems to be solved.The recyclable energy in automotive suspension system has attracted intensive attention in recent years,Scholars have proposed and studied various structural designs of the regenerative shock absorber to achieve the goal of energy recovery and the reduction of dissipation.These studies focus on the energy conversion from kinetic energy to electricity.Although the corresponding conceptual models have been proposed and evaluated,the previous models have mostly been simplified,without considering the parameters uncertainty and the various losses in system.In addition,most of the established system models have not been verified by experimental works.Therefore,this paper develops a Regenerative Hydraulic-electric Shock Absorber(RHSA)system,and explores the detailed dynamic behavior of system model.It summarizes the change laws of system behavior with the main different component parameters such as hydraulic cylinder,check valves,accumulator,hydraulic motor and generator.The parameters setting of corresponding components are optimized to break through these key technologies including the energy conversion mechanism,structure design,damping analysis,power regeneration optimization and so on.Combined with the test verification,a set of RHSA system with stable performance is developed.The main works are as follows:1)A comprehensive mathematical model is developed for pavement,suspension and regenerative shock absorber.In view of the insufficient description for regenerative damper model and the poor consideration of working conditions,this paper describes the comprehensive model for road,suspension and regenerative shock absorber.The road profiles model and quarter car model are introduced for a more reliable work condition.The introduction of hydraulic accumulator into system has been studied in both corresponding modeling and testing to provide power smooth.The steady flow,various losses and nonlinearities of the system are taken into account to obtain a more comprehensive and detailed system dynamic model and accurate behavior prediction.2)Numerical simulation of damping characteristic and power regeneration is studied under different excitations.Aiming at the complicated parameters and optimization index for RHSA system,a comprehensive analysis of numerical model is studied in this paper.The damping characteristic and parameters sensitivities are studied firstly under sinusoidal excitation to meet the requirements of damping force for vehicles mobility.After that,the orthogonal test method is applied to performance simulation involved multi-factor and multi-level to improve the power regeneration behavior of RHSA system.Based on the optimization results,a set of RHSA system is developed that satisfies the requirements of both vehicles damping and power recovery.In addition,the dynamic behavior of the system under the road excitation is also qualitatively analyzed,which provides a further reference for the system optimization design.3)the prototype of RHSA system is produced and the test bench is set for the system verification.As the result of the lack of reliable test verification for current regenerative shock absorber system,this paper designs and manufactures prototype for the study of RHSA system based on the simulation results.In addition,the test bench and measurement system are assembled according to the test standard.The damping characteristics and power recovery performance are evaluated under different excitation conditions.The test results show that the numerical simulation results and test dynamic behavior have a good agreement.Therefore,the established numerical model in this paper can predict the system behavior accurately to guide the optimization design of regenerative shock absorber system,which has a good military and civilian promotion prospects.Furthermore,the simulation of the RHSA system and parameter optimization are all realized on the MATLAB software,which provides sufficient flexibility to take into account more influence factors for accurate and detailed analysis and thus can be an effective mathematical tool for further development research in this direction such as the optimization of the structures,control strategies and system integrations... |
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