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.
Highlights
High voltage insulator is widely used in transmission equipment
We employ the harmonic balance method to investigate the dynamical behavior of a upright pole coupled with leady isolators under harmonic base excitation
It consists of a ceramic upright pole located on an elastic circular platform, and four leady isolators are uniformly distributed around the platform
Summary
High voltage insulator is widely used in transmission equipment. They are usually designed as slender upright pole; see Figure 1. Huang et al [14] analytically and experimentally studied the vibration isolation characteristics of a nonlinear isolator using Euler buckled beams as negative stiffness corrector. Carboni et al [24] found that rheological device provided nonlinear hysteretic forces to a one-degree-of-freedom mass through suitable assemblies of NiTiNOL and steel wire ropes subject to tension-flexure cycles They studied the frequency-response curves of the isolator system subject to base excitation numerically and experimentally [25]. Xiong et al [29] used incremental harmonic balance method to analyze the vibration of a nonlinear system with the bilinear hysteretic oscillator Based on these methods, we employ the harmonic balance method to investigate the dynamical behavior of a upright pole coupled with leady isolators (see Figure 2) under harmonic base excitation. The influences of system parameters on vibration response and resonant peak are discussed in detail
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