Effect of Particle Material, Size and Filling Percentage on Particle Damping Phenomenon for Gear Transmission System

Particle damping is a passive vibration control technology. At the present stage, particle damping technology is developing especially in machinery and aerospace fields. For studying the particle damping effect different parameters such as particle material, size and filling percentage is used. One of the applications for particle damping phenomenon is gear transmission system. For simulation of particle damping discrete element method (DEM) software is used. The simulation results have been validated by comparing with experimental results of a physical system. Find damping effect due to particle damping from simulation and experimentation.

Features of determining the deformed state of a particle material during hot stamping of porous moldings

The paper describes main methods for assessing the deformed state of porous body metal frames developed by different authors based on the analysis of yield conditions and governing equations, using the principle of equivalent strains and stresses, and studying the kinetics of metal strain during pressing. Formulas were derived to determine the components of the powder particle material strain tensor through dyads, as scalar products of the basis vectors of the convected coordinate system at each moment of porous molding strain. The expediency of using the analytical expressions developed to determine the deformed state of the particle material was experimentally substantiated subject to the known displacement vector parameters of representative elements (macrostrains) of porous billets. The applications of well-known analytical expressions were established, and the proposed formulas proved applicable for the deformed state assessment of particle metal during the pressure processing of powder products of different configurations and designing billets with a defined porosity and geometric parameters as a basis for compiling software algorithms for the computer simulation of porous molding hot stamping.

Particle Behavior Investigation for Different Structures of Hoppers

In this paper, two different kinds of hoppers were proposed. In order to investigate particle behavior in hoppers, the discrete element method (DEM) was introduced and soybeans were chosen as test material Particle behavior of four different samples were simulated under different flow rate. Results reveal that the deflection cone greatly affected the particle behavior. After adding the deflection cone in the hopper, the trajectory of particle material can be restrained and the dust diffusion can be reduced.different distances of the deflection cone showed different guiding effect on the particle movement.

A novel graphene-based Fe3O4 nanocomposite for magnetic particle inspection

The magnetic particle material is the crucial part in the field of nondestructive inspection. Nevertheless, traditional magnetic particle still leaves much to be desired. In this research, we designed a simple procedure to synthesize a novel graphene-based ferroferric oxide (Fe3O4) nanocomposite. All characterizations implied that Fe3O4 was anchored on the surface of reduced graphene oxide (RGO) nanosheets successfully. Especially this specimen reveals significant magnetic property improvement and macroscopic stability because of the synergistic effect between Fe3O4 and graphene, as compared to the traditional magnetic particle. More importantly, our method optimizes intrinsic magnetization intensity, reduces remanence and sedimentation velocity of magnetic particle material. Thus, this nanocomposite holds great potential for the field of magnetic particle inspection.

Poroelastic properties of hydrogel microparticles

The universal force relaxation of a poroelastic hydrogel particle undergoing constant compression by a spherical probe is determined, allowing analysis of experimental measurements of hydrogel particle material properties for the first time.