A semi-analytical method is used to illustrate the behavior of a multimodal nonlinear electromechanical system which is under base-excitation. System is considered as piezo-ceramic patches attached to a cantilever beam coupled to a resistive load. The cantilever beam is modeled as a nonlinear Timoshenko beam using Assumed Mode method and equations of motion are derived through Lagrange's equati...

Abstract A comparative analysis of the solutions for seismic impact on a flexible retaining wall designed to strengthen construction excavation multi-storey building in Sofia has been performed. For this purpose, following FEM calculation models interaction with surrounding soil body were compiled: (1) 1D beam-column-spring model wall, including spring support its embedded length and pseudostat...

The accelerator safety interlock system (ASIS) for the X-ray free electron laser (XFEL) at SPring-8 protects personnel from radiation hazards. We developed an ASIS consisting of three interlock systems: a central interlock system (CIS), an emergency interlock system (EIS), and a beam route interlock system (BIS). The CIS and EIS monitor the safety equipment status and emergency stop buttons, re...

We study a mathematical model of hinged flexible beam with piezoelectric actuators and electromagnetic shaker in this paper. The is modelled as mass spring system attached to the beam. To analyze free vibrations mechanical system, we consider corresponding spectral problem for fourth-order differential operator interface conditions that characterize dynamics. characteristic equation studied ana...

A parallel leaf spring guidance is defined as a benchmark problem for flexible multibody formalisms and codes. The mechanism is loaded by forces and an additional moment or misalignment. Buckling loads, changes in compliance and frequencies, and large-amplitude vibrations are calculated. A previously developed beam element for modelling the leaf springs is shown to be able to describe these phe...