Vibrating flip-flow screens (VFFS) with stretchable polyurethane sieve mats have been widely used in screening fine-grained materials recent years. In this work, the discrete element method (DEM) is to study process VFFS explain particle flow and separation behavior at scale. Unlike traditional vibrating screens, for VFFS, amplitude response of each point on elastic mat different everywhere. Th...

Magnetic CoFe2O4 nanoparticles were synthesized via a simple chemical reaction using precipitation method. The obtained materials consist of ferrite particles with average diameter of 25 nm. The effect of different surfactants such as cationic, anionic and neutral on the morphology of the products was investigated. Scanning electron microscopy was used to study the structure and particle size o...

Particle damping is a type of impact damping that is designed to mitigate the response of lightly damped structures under dynamic loading. It consists of granular materials constrained to move between two ends of a cavity in a structure. When attached to a vibrating structure, the collisions of individual particles with cavity boundaries result in a reduction in the vibration amplitude of the s...

Multiple attractors and their fractal basins of attraction can lead to the loss global stability integrity Micro Electro Mechanical Systems (MEMS). In this paper, multistability a class electrostatic bilateral capacitive micro-resonator is researched in detail. First, dynamical model established made dimensionless. Second, via perturbating method numerical description attraction, multiple perio...

This paper describes an analytical and experimental investigation of the property of modal disparity in a vibrating structure. For a given structure, the concept of modal disparity describes the structure’s ability to generate significant changes in the mode shapes by some type of on-the-fly structural modification. In the present study we consider a vibrating beam that experiences a controlled...

We investigated the harvesting performance of a double piezoelectric generator, which was embedded into engine block small passenger car. The resonance frequency is approximately between 37 and 52 Hz, where cantilever showed maximum displacement. In reality, has vibrating characteristic, dramatically reduces displacement, even when operating deviates slightly from frequency. To acquire large me...