Research Papers

Vibration Control of a Floating Raft System by Synchrophasing of Electrical Machines: An Experimental Study

[+] Author and Article Information
Tiejun Yang

Power and Energy Engineering College,
Harbin Engineering University,
Nangtong Street No. 145,
Harbin 150001, China
e-mail: yangtiejun@hrbeu.edu.cn

Di Huang

Power and Energy Engineering College,
Harbin Engineering University,
Nangtong Street No. 145,
Harbin 150001, China
e-mail: huangdi@hrbeu.edu.cn

Xinhui Li

Power and Energy Engineering College,
Harbin Engineering University,
Nangtong Street No. 145,
Harbin 150001, China
e-mail: linxinhui@hrbeu.edu.cn

Michael J. Brennan

Departamento de Engenharia Mecânica,
Universidade Estadual Paulista (UNESP),
Av. Brasil Centro,
Ilha Solteira (SP) 56-15385-000, Brasil
e-mail: mjbrennan0@btinternet.com

Liubin Zhou

Wuhan Second Ship Design and
Research Institute,
Yangqiaohu Street No.19,
Canglongdao Development Zone,
Wuhan 430205, China
e-mail: liubin.zhou@foxmail.com

Minggang Zhu

Power and Energy Engineering College,
Harbin Engineering University,
Nangtong Street No. 145,
Harbin 150001, China
e-mail: zhuminggang@hrbeu.edu.cn

Zhigang Liu

Power and Energy Engineering College,
Harbin Engineering University,
Nangtong Street No. 145,
Harbin 150001, China
e-mail: liuzhigang@hrbeu.edu.cn

1Corresponding author.

Contributed by the Technical Committee on Vibration and Sound of ASME for publication in the JOURNAL OF VIBRATION AND ACOUSTICS. Manuscript received October 6, 2016; final manuscript received February 16, 2018; published online March 30, 2018. Assoc. Editor: John Judge.

J. Vib. Acoust 140(4), 041015 (Mar 30, 2018) (8 pages) Paper No: VIB-16-1492; doi: 10.1115/1.4039407 History: Received October 06, 2016; Revised February 16, 2018

This paper describes an experimental investigation into the vibration control of multiple electrical machines installed on a large-scale floating raft system. Vibration transmission to a flexible hull-like structure that supports the floating raft is controlled by adjusting the phases of the electrical power supply to the machines—a technique known as synchrophasing. Each machine is driven by a phase asynchronous motor and has two counter rotating shafts with adjustable eccentric masses, which allows the dynamic force generated by each machine to be set independently. Up to four rotating machines are considered. A genetic algorithm is used in the search for the optimum relative phases between each machine, because it is impractical to carry out an exhaustive search of the huge number of possible phase combinations. It is demonstrated that vibration control using synchrophasing is feasible in a marine environment, and can achieve significant vibration reduction, by simply adding some sensors and a control system. Reduction in the total transmitted vibration, as measured by the sum of the squared accelerations from 22 error sensors on the hull-like structure, was found to be up to 13 dB, and vibration reduction at higher harmonic frequencies was found to be up to 51 dB.

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Fig. 1

Photographs of the large-scale vibration isolation test-rig: (a) the floating raft vibration isolation system on a hull-like structure, (b) resilient isolator between the raft and hull-like structure, and (c) one of the rotating machines

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Fig. 2

Block diagram representation of the large-scale vibration isolation test-rig

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Fig. 3

The phase angles of the control machines with respect to the reference machine. They are defined to be positive in the direction of the rotation of each machine.

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Fig. 4

Block diagram of the synchrophasing control system

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Fig. 7

Details of the program used to generate the optimum phases, given in block diagram form

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Fig. 6

Spectrum of the minimum and maximum values of the cost function when four machines were operating at 2400 rpm and the first-order was controlled

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Fig. 5

Experimental results. Red bar shows the value of the cost function when the phases of the machines are adjusted to maximize the transmitted vibration. The green bars show the value of the cost function when the phases of the machines are adjusted to minimize the transmitted vibration: (a) synchrophasing with two machines of M1 and M4, (b) synchrophasing with two machines of M1 and M2, (c) synchrophasing with three machines of M1, M2, and M4, and (d) synchrophasing with all four machines.



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