A study on positioning standard of active hybrid mounting system for 6-DOF bar structure

Byeongil Kim,Qiu Yang

doi:10.21595/vp.2020.21333

Abstract

This article is to find optimized placement for an active mounting system suitable for a 6-DOF bar structure with two active paths. When a sinusoidal excitation force is applied to the structure, secondary force and phase of the two active supports can be calculated mathematically. When the position changes, the magnitude and phase of the secondary forces in each path will be analyzed using simulation. If the forces applied to the two active mounting system are relatively small and the phase does not change by 180 degrees, these specific positions of paths are considered as optimized positions of the active mounting system. Based on the simulation results, criteria for selecting the location are proposed, which will be very useful for proper selection of actuators for engine mount system.

Highlights

In automotive industries, engine vibration isolation has been always a difficult task and due to the trend of lighter weight and higher power of vehicles, it has become a more serious problem
In order to improve the NVH performance of mounting systems, active control methodologies have been applied and many research has focused on the position of the engine mount system to optimally reduce vibration
Vibration reduction of a coupled path structure with a piezoelectric laminated actuator and a rubber bearing is studied and active path interactions are quantified based on the dynamic characteristics of the passive system [3]

Summary

Introduction

Engine vibration isolation has been always a difficult task and due to the trend of lighter weight and higher power of vehicles, it has become a more serious problem. In order to improve the NVH performance of mounting systems, active control methodologies have been applied and many research has focused on the position of the engine mount system to optimally reduce vibration. For different engine installation positions, vibration characteristics of heavy commercial vehicles are studied. Under the same excitation conditions, the vibration reduction could be changed as the position of the movable active engine mount changes. There are two paths made of a piezo-stack actuator and a rubber mount to provide active vibration isolation between the bars. A STUDY ON POSITIONING STANDARD OF ACTIVE HYBRID MOUNTING SYSTEM FOR 6-DOF BAR STRUCTURE.

Control force calculation

Changing the position of actuator 1

Changing the position of actuator 2

Location criteria

Conclusions