On December 4, 2020, the Guangdong Special Equipment Industry Association organized and hosted a scientific research project completed by Guangdong Special Equipment Inspection and Research Institute in Foshan City, "Failure Mode Analysis and Risk Response Study of LNG Vehicle-mounted Cylinders in Bumpy Road Conditions "Achievement appraisal meeting. The appraisal committee listened to the report of the project undertaker and reviewed the results appraisal materials. After inquiries and discussions, the appraisal committee believes that the research results of this project have optimized the structural design of LNG vehicle-mounted gas cylinders and reached the domestic advanced level, and they agreed to pass the appraisal.

  Aiming at the failure mode of LNG vehicle-mounted gas cylinders under bumpy road conditions, the project team first used a vibration test bench to simulate bumpy road conditions and tested the gas cylinders with different filling quantities. It was found that the resonance frequency of the inner tank decreased as the filling volume increased. At full load, the resonance frequency is close to the maximum excitation frequency; secondly, for complex working conditions such as vibration bumps, acceleration and deceleration, braking, sharp turns, and B and D road surfaces, numerical simulation methods are used to analyze various working conditions of the vehicle during driving. Based on the distribution of equivalent stress and displacement, it is concluded that the supporting structure is the most likely part of the gas cylinder to fail under vibration; finally, by optimizing the supporting structure, comprehensively considering the heat transfer and strength reliability, the optimal structure size is determined , Proposed risk response measures.