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research-article

Dynamic Analysis of an Offshore Platform with Compressor Packages - Application of the Substructure Method

[+] Author and Article Information
Ying Zhao

School of Energy and Power Engineering, Xi’an Jiaotong University, No. 28, Xianning West Road, Xi'an, Shaanxi, 710049, P.R. China
zy18706704461@stu.xjtu.edu.cn

Xiaohan Jia

School of Energy and Power Engineering, Xi’an Jiaotong University, No. 28, Xianning West Road, Xi'an, Shaanxi, 710049, P.R. China
jiaxiaohan@mail.xjtu.edu.cn

Yian Zhang

School of Energy and Power Engineering, Xi’an Jiaotong University, No. 28, Xianning West Road, Xi'an, Shaanxi, 710049, P.R. China
iamspecial1994@stu.xjtu.edu.cn

Xueyuan Peng

School of Energy and Power Engineering, Xi’an Jiaotong University, No. 28, Xianning West Road, Xi'an, Shaanxi, 710049, P.R. China
xypeng@mail.xjtu.edu.cn

1Corresponding author.

ASME doi:10.1115/1.4039262 History: Received April 15, 2017; Revised January 31, 2018

Abstract

This paper presents the substructure-based dynamic analysis of an offshore platform with compressor packages. Three typical substructure methods, the Guyan condensation method, the fixed-interface component mode synthesis (CMS) method and the free-interface CMS method, were compared to identify the appropriate substructure method for this application. A mode truncation criterion was proposed to ensure the accuracy of the recommended substructure method. The results indicated that the free-interface CMS method could generate almost the same results as the fully coupled method, and save more than 50% in calculation time and more than 60% in storage space. When the same amount of time was used, the free-interface CMS method obtained more accurate results than the fixed-interface CMS method and Guyan condensation method; thus, the use of this method for evaluating the dynamics of an offshore platform with compressor packages was recommended. The cut-off frequency of the substructure was suggested to be 1.25 times the highest frequency of interest when conducting a dynamic analysis of an offshore platform with compressor packages using the free-interface CMS method. In addition, the offshore platform is a flexible structure with low and dense mechanical natural frequencies (MNFs), with approximately 4500 orders vibration modes in the frequency range of 0-40 Hz, and the displacement response at the area around the compressor package exceeded the allowable value under the excitation of the compressor package.

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