Reliability Study Of Locking Mechanism Of Offshore Evacuation System

The multi-point locking mechanism is one of the key mechanisms of the offshore evacuation system.The reliability of the evacuation system is affected to a certain extent by the reliability of the completion of the prescribed function under the specified conditions and the stipulated time.In this paper,for the problem of motion accuracy and structural strength of the multi-point locking mechanism,the motion reliability analysis and structural strength reliability analysis are carried out.The primary tasks are as follow:Firstly,according to the actual operating conditions,fault tree analysis is used to analyze the cause of failure of the locking mechanism.For multi-point locking mechanism in-plane motion reliability issues,this paper uses the compound hinge zero dislocation method to deal with the compound hinge problem,and constructs the basic model of mechanism motion analysis.On the basis of this model,the continuous contact model and the matrix method are used to establish an analysis model of the mechanism's motion accuracy considering the hinge clearance and rod length manufacturing error.The output parameters of the output components of the locking mechanism can be analyzed by this model.By establishing the mechanism motion reliability model of the output parameters of each output component of the mechanism through the first-order second-moment method and the system reliability model of the multi-point locking mechanism through the series reliability model,the system motion reliability parameters of the mechanism can be obtained.Secondly,this paper analyzes the structural reliability of the mechanism.According to the actual operating conditions,analyze the change of the load of each locking block when the locking mechanism under load and gravity changes from four-point support to three-point support.According to the load analysis,the most dangerous locking block is selected and according to the stochastic finite element theory using ANSYS analysis software to analyze the reliability of the structure under consideration of the material and load random variables by using Monte Carlo and response surface methodology.Finally,using adaptive weight method and hybrid crossover operator and the Tournament selection operator to deal with the constraint problem,this paper establishes an improved particle swarm optimization algorithm that can handle the constraint problem.The optimization model is established with the motion accuracy as the optimized object and therod length spatial constraints as the constraint condition,the rod length parameters of the mechanism are optimized.optimize the structure of the locking block using a combination of topological optimization and size optimization to achieve double-optimization of topological structure and size parameters.