Performance evaluation of a novel intelligent distributed mounting system for marine mechanical equipment

Yuanran Qiu,Wei Xu,Zhengmin Li

doi:10.1177/1729881419883562

Yuanran Qiu, Wei Xu + Show 1 more

Open Access

https://doi.org/10.1177/1729881419883562

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Abstract

Machinery mounting system is one of the most significant vibration and noise attenuation technology for marine mechanical equipment. A novel intelligent mounting system having distributed intermediate mass light in weight, intelligent in function and small in installation space is presented. The performance of the novel distributed mounting system is analysed using a simplified but efficient theoretical model. The influences of system designing parameters including weight of intermediate mass, stiffness of isolators and mechanical impedance of foundation on vibration isolation efficiency are analysed. A scale experimental prototype was established to verify the accuracy of theoretical analysis. Conclusions of theoretical and experimental analysis reveal that stiffness of isolators should be chosen as small as possible under the premise of stability of system. The intermediate mass should be chosen within a reasonable range based on the index requested on isolation efficiency because substantial increase on intermediate mass will not lead to substantial increase on vibration isolation efficiency which is different from conventional methods to obtain considerable isolation efficiency. And intelligent safety mechanism designed to ensure the ultimate operation safety of equipment was introduced. The novel intelligent mounting system is qualified with the need of practical projects on vibration isolation efficiency and reliability standard, providing a new way for vibration engineer to choose when making mounting plan for marine machinery equipment.

Highlights

Marine mechanical equipment, including diesel engine, gas and steam turbines, electric motor and so on, is the prime vibration and noise sources of marine vessels
The receiver’s velocity and vibration isolation efficiency of two-stage mounting system having distributed intermediate mass were studied by four-pole parameter method
(2) The theoretical and experimental results show that larger amount of rigid intermediate mass will lead to better vibration isolation efficiency if vibration isolation considered only

Summary

Introduction

Marine mechanical equipment, including diesel engine, gas and steam turbines, electric motor and so on, is the prime vibration and noise sources of marine vessels. Kashani[20] has ever designed a computer controlled air isolation system for a diesel generators on-board luxury watercraft He et al.[21] introduced an air spring mounting system for marine propulsion system consisting of air spring subsystem, alignment control subsystem and safety protection subsystem which has been applied in a large-scale marine propulsion unit and obtained impressive vibration isolation efficiency and operate smoothly and safely. The research results based on the calculation and analysis on the distributed intermediate mass mounting system with intelligent controlling system designed to equip with can be used as a reference for naval vessel noise attenuation research and engineering design if necessary. The four-pole parameters of basic mechanical components are as followed below[22,23,24]

CA ð3cÞ

Experiments

Findings

Conclusion