Dynamics of a Upright Pole Coupled with Nonlinear Hysteretic Isolators under Harmonic Base Excitation

Abstract

Leady isolator shows hysteretic nonlinearity. The isolation efficiency of leady isolator is an important problem in many engineering structures. In this paper, vibrations of a ceramic upright pole coupled with four leady isolators under harmonic base excitation are studied. A hysteretic force-deformation model of leady isolator is derived from experimental results. With this model, the vibration of the pole in rotation is studied. The frequency response is obtained analytically by employing harmonic balance method. The analytical results are agreed well with numerical results. The vibration of the pole is decreased greatly by leady isolator, especially near resonant case. The influences of system parameters on vibration response and resonant peak are discussed in detail.

On the Nonlinear Seismic Responses of Shock Absorber-Equipped Porcelain Electrical Components

“…e connection between the shock absorber and the cement part of the flange at the base of the equipment is equivalent to a series spring [17]. e angle of the shock absorbers' surface of action is φ 1 , and the spring angle relative to the cement part of the flange at the base of the equipment is φ 2 .…”

“…To date, numerous scholars have undertaken research into the seismic properties of pillar-type porcelain insulators and nonlinear theoretical analysis of related shock absorberequipped structural systems. Cheng Yongfeng et al studied the nonlinear responses of shock absorber-equipped pillartype porcelain insulators under harmonic excitation [17]. Cheng Yongfeng et al studied the seismic performance of 1000 kV lightning arresters and transformers connected by rigid tubular busbar through shaking table testing [18].…”