Amplitude Of Vertical Oscillations Research Articles

Поділ сипкого матеріалу при вертикальних коливаннях робочої поверхні

The purpose of this work is to calculate the process of separation of particles of loose material in a layer under the action of vertical or spatial vibrations. This effect still does not have a satisfactory theoretical explanation. Well-known works, which consider the qualitative characteristics of "rising" or "sinking" of particles, have a phenomenological approach. There is also a probabilistic approach to this problem without taking into account the characteristics of particles and vibration parameters. In this work, bulk material is considered as having particles of different sizes and densities. As a hypothesis, it is assumed that the particles have a spherical shape, the amplitude of harmonic low-frequency vibrations of the surface is proportional to the size of the main mass of the particles, at the moment of separation from the surface, all particles are given the same speed, but a different amount of energy, which is proportional to their mass. The friction coefficient between the particles is also taken into account. According to the calculation of the trajectory of the particles and their position at the end of the separation movement, the trajectories of the main mass of particles are compared with those that differ in size or density. Calculation of the trajectories for a series of detachment movements of the studied particles allows to determine the speed of the separation process, that is, the speed of their advancement in the material layer. It is shown that the speed of distribution of particles depends on the difference in size, density of individual particles, frequency and amplitude of vertical oscillations.

Non-contact suspension techniques for pellets in laser fusion experiments

A Ni-coated plastic micro balloon (Ni-PMB) suspended in non-contact fashion is reported to achieve uniform irradiation of a laser fusion target. The first section presents the development of magnetic suspension system ‘MINO-2’ for laser fusion experiment; MINO-2 demonstrates magnetic suspension of a 1 mm diameter, Ni-PMB at <1.0×10 −3 Pa with the vertical oscillation amplitude <5 μm; We successfully demonstrated a laser shot experiment in MINO-2. The second section describes the method of active damping of horizontal oscillation using optical forces, in which the initial vibration 27.3 μm became 1.8 μm in 3.7 s. In the third section, a pulsed current method for laser physical deposition is proposed where we find the droplets decrease. Finally, another method of non-contact technique is proposed where an electrodynamic suspension is used as one of non-contact suspension methods. The minimum vibrating amplitude less than observable resolution is attained experimentally at three voltages and at the precise position of the ring electrode in the air.