Methods Of Particle Damping And Its Application In Mechanical Vibration Control

Particle damping technology is a kind vibration control technology which is applied particle damping characteristics. The technology mainly transforms the vibration mechanical energy into heat or other forms of energy to make the energy to be consumed by filling particles in cavity structure. Particle damping technology achieves the purpose of reducing vibration or inhibition structural vibration when particles produce interaction of friction and collision with particle motion. The particle damping technology is only required less change for the original structure which needs less the production cost or small system of added mass, but the damping effect is obvious. Granular materials can absorb wide frequency vibration energy.Particle damping don ′ t decrease in the damping performance because of the high temperature environmental. Therefore, particle damping technology is a worthy of research and development of vibration damping technology, particle damping mechanism and application research have become a hot topic in the field of vibration at home and abroad.At present, the particle damping technology has had certain application in the field of engineering vibration control, but, the overall study of the theory of the particle damping technology is still in the exploratory stage. The experimental methods and means are not yet perfect. Applied research is still in its infancy, so,it is necessary to further study of the damping technology.Particle damping mechanism and its control technology are deeply studied by three aspects such as theory, experiment and application in this paper. The main work is:First of all, the development history and current situation of the particle damping technology are summarized. Four typical particle damping techniques are introduced from two aspects of application and theory, which four typical particle damping techniques are shock damping technology, particle damping technology, bean bag damping technology and non-obstructive particle damping. The structural characteristics of the particles are discussed in the paper. The particle structure isdiscontinuous in geometry. The transfer force between particles is not stable. Friction particles chain stably exist conditions is deduced, when the particles body is a continuous medium and friction particles chain is stable particles chain.Secondly, the ellipsoid particles movement is different under different external force, and energy dissipation mechanism is also different. Between the particles and the particles of the cavity is not relative motion when the external force is smaller. At the same time, the particles move together with the structure, particle chain is not destruction, and the stress wave energy is mainly particles energy dissipation form.The stable ellipsoidal particles chain disruptions may be damaged with increasing vibration force, established the ellipsoid particles model can judge whether the particle chain is stable. If external force continually increases, the stable ellipsoidal particles chain is disrupted, and the particles relative movement is relative friction movement or collision movement. There is a friction energy particle damping expression when the particles relative movement is friction movement. The particle collision energy formula is being calculated from the energy consumption of the particles body when the particles relative movement is collision movement.The dynamic characteristics of the pump flask particle damping have been systematically studied by testing. Water pump sand-box particle damping vibration system and the level of vibration isolation system model are analyzed by using the power flow theory, the curve of input power flow vibration system, the output power flow and output speed are simulation analysis by mat lab software based on power-the force analogy method and the theory of four terminal parameters. The parameters of the impact of particle size, fill rate sand box structure how to affect the pump sand box system vibration is analysis by experimental when using a metal spring vibration isolators or rubber spring in the pump sand box. At the same time, the parameters of the impact of particle size, filling rate and sand box structure how to affect the pipe and the wall vibration is analysis.Finally, the particle damping parameter optimization model is established to optimization particle damping parameters by using simulating degradation.Parameters optimization of particle damping parameters is applied to practical engineering isolation vibration; engineering practice shows that the method caneffectively reduce the vibration and noise of the device.The particle damping technology can improve the damping of the system.Particle damping technology can better control systems vibration, the application of particle damping technology provides a useful exploration for the development of isolation vibration technology.