Optimal Design Of Structural Parameters Of Linear Motor For Vehicle Energy-feeding Suspension

Suspension damping absorbs vibration of the vehicle body under road irregularities,by dissipating mechanical energy into heat waste.For demand of energy efficiency,the suspension vibration energy harvesting is now increasingly critical at home and abroad.Structural design and optimization of vibration energy harvester have aroused extensive attention of scholars.Most efforts concentrated upon the electric power generation from vehicle vibration conversion.Whereas,suspension resonant frequency shift induced by additional regenerative harvesters will seriously affect the suspension performance,due to increasing the unsprung mass and changing the damping coefficient directly.The impact on suspension performance caused by regenerative harvesters is rarely taken into consideration in design and optimization of the harvesters,and has not been revealed yet.The dissertation focuses on the characteristic of regenerative suspension,and structural parameter optimization of regenerative harvesting tubular permanent-magnet linear machine(TPMLM),in order to achieve excellent suspension performance and optimized power generation performance simultaneously.The main contents of the dissertation are as following:1.The transient analytical model for regenerative TPMLM is proposed,based on separated excitation source of magnetic field for the vector potential solving method.The model consists of the thrust force expression and winding circuit equation under arbitrary stroke position.The proposed transient model has rapid operation speed and high accuracy comparing with the finite element analysis.2.The dynamic model of a 2-DOF vehicle regenerative suspension system with damper parallel installation of TPMLM is constructed,based on the proposed TPMLM transient model.The inherent suspension characteristics and energy harvesting feature of regenerative suspension system are systematically analysised under typical road excitation.The results establish a theoretical foundation for further structural parameters optimization of the regenerative harvester.3.A novel forward design method of TPMLM is proposed considering suspension performance,in which the power generation is used as the object and the mechanical and suspension performance are used as the constraints.The proposed design method can make the TPMLM to acquire maximum power generation and effectively match the suspension parametric coefficient.4.The prototype of TPMLM and hardware-in-loop simulation of the regenerative suspension system is developed,according to the optimized structural parameters.The experimental results effectively validate the forward design method that optimized structural parameter of TPMLM can match the inherent suspension characteristic in its design process.