For the horizontal vibration conveyor, the system dynamics is analyzed. Taking into account the effect of the properties of materials and interaction force between the particles on the conveying velocity of materials, introduces the general principle of DEM and the motion of particles in horizontal vibration conveyor is macro simulated and numerical simulated. The effects of amplitude, frequency and thickness of particles on the motion of particles are analyzed.

International audienceThe assessment of thermoelastic attenuation is crucial in designing surface acoustic wave (SAW) devices. As irregular structures are more and more involved in modern applications for which efficient numerical tools are required, a multi-physics finite-element model is proposed in this paper, where thermoelastic damping in piezoelectric materials can be accounted for in both coated and uncoated conditions. The coupled equations are solved iteratively in time domain, using the Newmark method. The mechanical, electrical, and thermal degrees of freedom are calculated simultaneously at each time step. An application of the model is presented through the investigation of thermoelastic loss in a lithium niobate SAW device

Vibrating sieve is a special kind of equipment which used to grading materials according to particle granularity. By the vibration acted on the sieve, the materials are loosed, are divided into layers, are transported and are permeated the sieve to screen the materials. Discrete Element Method (DEM) has been an effective numerical method to research the granule system motion. Using Particle Flow Code (PFC) based DEM, the screening process, the particle group motions on the screen, are simulated. How the amplitude, the frequency of vibration, the vibration direction angle, the decline degree of sieve effect screening efficiency are presented.

The power bond graph of hydraulic array nail machine was built on the basis of analyses on its hydraulic system and actual working cases. Dynamic model of array nail machine hydraulic system was built. At the same time, making use of Simulink, dynamic simulation of hydraulic system of array nail machine was carried out. Influence law of primary technology parameters on dynamic characteristics of the hydraulic system was expounded. The simulation results will provide theory bases for performance analysis and optimal design of array nail machine hydraulic system.

For the non-harmonic vibration conveyor, a single-degree-of-freedom dynamics model is built for the horizontal motion of bulk materials, in which the dry friction force is piecewise nonsmooth. The effect on conveying velocity is studied for six vibration parameters in the excitation force with two harmonic components. The conveying velocity increases with the increase of frequency and amplitude, but the optimum frequency ratio is 2, and the optimum amplitude ratio approaches 1/3. The initial phase has no effect on conveying velocity, and the effect of phase difference is periodic, i.e. the forward conveying is best on phase difference π/2, and the backward conveying is best on phase difference -π/2.