Research On The Characteristics Of The Particle Damper And The Application In Vibration And Noise Reduction On The Wheel

With the rapid development of the high-speed railway transportation system,while makes people's life more convenient,but also causes serious vibration and noise pollution,which has brought about great trouble to human's normal life.Non-obstructive particle damping,as a passive vibration suppression technique which has been widely applied thanks to its little modifications of vibrating structure,significant improvement of structure damping,adaptability to a severe environment,effectiveness over broad frequency range and so on.Therefore the properties of the particle damper are explored through experiments and simulation in this paper.Besides the high-speed rail wheels particle damper which are validated the favorable effects on the reduction of vibration and noise are developed combined with the characteristic of vibration and acoustics field of the wheel.Based on the discrete element method and the collision mechanics,the qualitative study of the properties in energy dissipation for particle damping are completed.And the energy dissipation mechanism in continuous inelastic collisions and frictions between the moving particles and the holder walls and among the particles themselves has been analysed.On this basis,the main factors which influence the energy consumption of particle damping are determined.Firstly,the global influence of the external excitation and the shape feature of the damper on the effect on the vibration of the particle damper is studied based on the micromeritics.And the particle damper has been designed and produced combined with the theoretical simulation later.Then,the overall influence of the material,diameter,and the collision between the soft and hard particles and among the soft particles themselves on the effect on the vibration reduction of the particle damper has been tested and summarized through lots of experiments.At last,the optimal value of some factors like the diameter and filling proportions of particle and the installation location of the particle damper has been confirmed.The simulation and test of the wheel mode are completed in this paper,such a conclusion can be drawn that the noise of the wheel-rail lies in where radial modes as well as axial modes of the 1 pitch circle 2 pitch diameter above has strongly coupled relationship.Meanwhile,the most volient position of the wheel vibration are found based on the research of the characteristic of vibration and acoustics field of the wheel within the external excitation.What's more,the vibrational energy of the wheel mainly lies in mid-and-high frequency and the corresponding relationship between the distribution law of the radiated sound field and the vibration of the wheel can be got based on the simulation.Besides another conclusion can be found that the tread and the plate of the wheel contributes the largest ability to the radiated noise.So it can achieve a more effective control on vibration and noise of the wheel through inhibiting the vibration of the tread and the plate of the wheel in mid-and-high frequency.At last,based on the theoretical analysis and experimental results,the particle damper using in high-speed wheel is developed according to the conclusion of the characteristic of vibration and acoustics field of the wheel.And the wheel is very effective in suppressing the vibration and noise of the wheel in 1600Hz~5000Hz through the test on the reduction of the wheel vibration and noise.Surprisingly the developed wheel particle damper can reduce the radial and axial noise of the empty wheel up to 16.28dBA?14.74 dBA separately,and it has the advantages of radial and axial noise in 2.85 dBA and 2.49 dBA separately compared with the existing wheel damping ring.