Analysis, Design and Testing of a Novel Quasi-Zero-Stiffness based Sensor System for Measurement of Absolute Vibration Motion

TL;DR

This paper introduces a novel quasi-zero-stiffness vibration sensor system that enables broadband, vibration-free absolute displacement measurement, combining theoretical analysis, prototype development, and experimental validation.

Contribution

It presents a new QZS-based sensor design using positive and negative-stiffness springs, overcoming instability issues and enabling broadband vibration measurement.

Findings

Effective broadband vibration-free measurement achieved

Prototype successfully avoids instability issues

Simulation and experiments confirm system effectiveness

Abstract

This study presents the analysis and design of a novel quasi-zero-stiffness (QZS) based vibration sensor system for measuring absolute displacement of vibrating platforms/objects. The sensor system is constructed by using positive and negative-stiffness springs, which makes it possible to achieve an equivalent QZS and consequently to create a broadband vibration-free point for absolute displacement measurement in vibrating platforms. Theoretic analysis is conducted for the analysis and design of the influence of structure parameters on system measurement performance. A prototype is designed which can avoid the drawback of instability in existing QZS systems with negative stiffness, and the corresponding data-processing software is developed to fulfill time domain and frequency domain measurements simultaneously. Both simulation and experiment results verify the effectiveness of this novel sensor system.