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Research Papers: Offshore Technology

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 710049, Shaanxi, China
e-mail: zy18706704461@stu.xjtu.edu.cn

Xiaohan Jia

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

Yian Zhang

School of Energy and Power Engineering,
Xi'an Jiaotong University,
No. 28, Xianning West Road,
Xi'an 710049, Shaanxi, China
e-mail: iamspecial1994@stu.xjtu.edu.cn

Xueyuan Peng

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

1Corresponding author.

Contributed by the Ocean, Offshore, and Arctic Engineering Division of ASME for publication in the JOURNAL OF OFFSHORE MECHANICS AND ARCTIC ENGINEERING. Manuscript received April 15, 2017; final manuscript received January 31, 2018; published online March 14, 2018. Assoc. Editor: Carlos Guedes Soares.

J. Offshore Mech. Arct. Eng 140(4), 041303 (Mar 14, 2018) (10 pages) Paper No: OMAE-17-1056; doi: 10.1115/1.4039262 History: Received April 15, 2017; Revised January 31, 2018

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 cutoff 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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Figures

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Fig. 2

Dynamic forces acting on the moving components and the compressor body

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Fig. 1

Reciprocating compressor

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Fig. 4

Fully coupled model

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Fig. 5

First-order mode shape of the scrubber obtained by case B

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Fig. 6

Mesh independency study

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Fig. 8

Condensation of the FE model of the compressor package to a super-element

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Fig. 9

Substructure model

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Fig. 18

Comparison of relative frequency error εf among three substructure methods

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Fig. 20

Comparison of eight cases with different cutoff frequencies: (a) relative frequency error εf, (b) relative displacement error εx, (c) calculation time, and (d) storage space

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Fig. 19

Comparison of relative displacement error εx among three substructure methods

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Fig. 10

Comparison of the first 10 orders MNFs among the three modeling methods

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Fig. 11

Comparison of the first-order mode shape between two methods: (a) fully coupled method (baseline) and (b) lumped mass method

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Fig. 12

Displacement amplitude versus frequency curve of the monitor point

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Fig. 13

Displacement distribution of the offshore platform at the first-order excitation frequency obtained by the fully coupled method (baseline)

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Fig. 14

Relative displacement error of all nodes on the offshore platform

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Fig. 15

Comparison of the stress distribution on the bottom of the compressor skid between two methods: (a) fully coupled method (baseline) and (b) lumped mass method

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Fig. 16

Comparison of the calculation time among the three modeling methods

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Fig. 17

Comparison of the storage space among the three modeling methods

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