# Multi-Frequency Vibration Suppression Based on an Inertial Piezoelectric Actuator Applied in Indoor Substations

## TL;DR

This paper presents a new method using a piezoelectric actuator to reduce multi-frequency vibrations in indoor substations, achieving significant noise reduction at various frequencies.

## Contribution

A novel active vibration isolation scheme using an inertial piezoelectric actuator for multi-frequency suppression in indoor substation structures.

## Key findings

- Vibration amplitude was reduced by up to 46.02 dB at 200 Hz using the proposed actuator.
- The method effectively suppresses vibrations at 100 Hz, 200 Hz, and 300 Hz frequencies.
- The study provides technical guidelines for active vibration isolation in large plate-shell structures.

## Abstract

This paper addresses the suppression of multi-frequency line spectrum vibrations during the operation of indoor substations through the development of an active vibration isolation scheme based on a piezoelectric stack inertial actuator. Based on the finite element modal analysis, the excitation frequencies that strongly influence structural response were identified, and the excitation points and sensor layout strategies were determined under a collocated control configuration. Subsequently, the actuator’s structural design and system integration were carried out. Experimental results demonstrate vibration amplitude reductions of 18.75 dB at 100 Hz, 46.02 dB at 200 Hz, and 32.04 dB at 300 Hz, respectively, validating the effectiveness of the proposed method in controlling line spectrum vibrations at multiple frequencies. The study shows that the coordinated optimization of modal matching and the dynamic response capability of inertial actuators provides experimental evidence and technical guidelines for active vibration isolation in large plate-shell structures.