In this paper, a DEM (Discrete Element Method) model is presented and a series of computer experiments is analyzed and compared to experimental validations. Also, the simulations are compared to experimental results. The model uses a 3 parameter contact force to calculate impact between particles and other object such as vanes. The components of the contact forces are typically modeled in terms...

This paper presents an investigation on thermo-electro-mechanical nonlinear low-velocity impact behaviors of the geometrically imperfect functionally graded (FG) graphene-reinforced composite (GRC) beam with surface-bonded piezoelectric layers. Both uniformly distributed and FG patterns graphene nanoplatelets (GPLs) are considered along thickness GRC host beam. The effective Young’s modulus is ...

Abstract In this publication, the Luneberg integrals are revisited and conditions of using such have been recalled. Additivity law Luneberg’s link with Frenel kernel for propagation discussed. By means definition integrals, a vectorial electromagnetic field (Hertz potentials) is developed new approach computation proposed based on Zernike polynomials. With simulations holograms illustrated in c...

In this paper, the nonlinear dynamic response of deep groove ball bearings with clearance was studied numerically. The imperfect connections raceways and rolling balls were established by contact elements. order to describe characteristics accurately, a hysteresis damping coefficient introduced into Hertz model, which represented dissipative term during contact–impact process. tangential force ...

A parallel-mechanism-equivalent model for repeatability analysis of an overconstrained kinematic coupling is proposed. An Kelvin-type with one additional support introduced and used method illustration. Contact forces the under a preload are computed Moore-Penrose inverse, deformations obtained using Hertz theory. The equivalently modeled as 7-SPS parallel mechanism, spherical joints which repr...

This study assessed the suitability of a new portable system that is based on Hertz's contact theory for evaluating internal gluteal muscle stresses under the ischial tuberosities of wheelchair users in real-time as a risk indicator for a deep tissue injury. Sitting in a wheelchair was monitored and processed with the portable system for six control subjects and five individuals with paraplegia...