Reliability Analysis and Experimental for Key Component of Launch and Recovery Equipment of Seafloor Drill

JIN Yongping1 WAN Buyan1 LIU Deshun1

(1.National-Local Joint Engineering Laboratory of Marine Mineral Resources Exploration Equipment and Safety Technology, Hunan University of Science and Technology, Xiangtan 411201)
【Knowledge Link】rainflow counting method

【Abstract】Launch and recovery equipment is the necessary equipment to realize the safe, reliable, and accurate launch and recovery for seafloor drill. Reliability analysis for key component of launch and recovery equipment under the random irregular wave environment is the basis of designing safe and reliable launch and recovery equipment. A new reliability analysis method for evaluating dynamic response characteristics of key component of the launch and recovery equipment is presented, and the reliability of the key component of the launch and recovery equipment is calculated under different variation coefficients. The research results show that the tension of the piston rod of hydraulic cylinder showed an irregular dynamic response under irregular wave, and the mean value of the tension of the piston rod of hydraulic cylinder is enhanced along with the increase of the flip angle of the launch and recovery equipment. A reliability of 0.999 126 is calculated when the variation coefficient is 0.3. The results of sea trial verify the correctness of the theoretical analysis and the random numerical simulation method. The technical support is provided for designing a safe, reliable, and accurate launch and recovery equipment.

【Keywords】 seafloor drill; launch and recovery equipment; random irregular wave; reliability analysis;

【DOI】

【Funds】 National Natural Science Foundation of China (51705145, 51779092) National Key R&D Program of China (2017YFC0307501) National High-tech R&D Program (863 Program, 2012AA091301)

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This Article

ISSN:0577-6686

CN: 11-2187/TH

Vol 55, No. 08, Pages 183-191

April 2019

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Abstract

  • 0 Introduction
  • 1 Launch and recovery equipment and mother ship as well as external load modeling
  • 2 Reliability analysis on the key component of launch and recovery equipment
  • 3 Experimental study and test analysis of launch and recovery equipment
  • 4 Conclusions
  • References