Study On A New Rescue Equipment Used For The Suspended Monorail Vehicle Based On Multi-objective Optimization Method

The rail of the suspenended monorail vehicle is located above the vehicle, and the distance between the vehicle and the ground is about 4~8m. So it is very difficult for the passengers to evacuate. Therefore, the rescue equipment for the suspended monorail vehicle is essential. If the rescue equipment can not evacuate passengers rapidly, timely, independently in the sudden situation, this type of vehicle would be difficult to be common in the world.The difficulty of suspended monorail vehicle passenger evacuation is mainly because of this type of vehicle suspension in the air. There is no place to stay after passengers leave out the train. The rescue vehicles used for this type of vehicle can not arrive at the first time, and the flexible slideway needs the help of a lot of people on the ground to complete the passenger evacuation. In view of the shortcomings of the present suspended monorail vehicle rescue equipments, this paper research and development a new type of rescue equipment with CAD, CAE, multi-objective optimization methods and technology. The related research work is as follows:(1) After the analysis of the advantages and disadvantages of the existing suspended monorail vehicle rescue equipment, the design requirements and application orientation of this new equipment is determined. The structure is designed based on the design requirements and application orientation and the model of this new equipment is established.(2) After studying on the rescue equipment working and running with the vehicle state, find escape ladder open conditions, passenger decline condition and crosswind conditions three typical conditions under working and some strength test conditions based on BS EN 12663-1:2010 and TB / T 3058-2002.(3) After the analysis of the mode and characteristics of this new rescue equipment in various conditions, the load and boundary conditions used in finite element analysis are determined. The FE model is established by using the three-dimensional model of the structure design, and the strength and modal analysis of the new rescue equipment are carried out by using the finite element method.(4) The thickness of 7 different parts of the rescue equipment were defined as design variables, and obtain enough sample points using the Latin Hypercube Design method. Then the response surface model, RBF neural network model and Kriging model was respectively established. And the comparison between these three models is done. After a comparative analysis of three kinds of approximate models, the precision of these approximate models can meet the requirements of engineering analysis. Then the Kriging approximation model with both local and global statistical properties is chosen to instead of the finite element model.(5) The Kriging model and the NSEA+ algorithm is chosen to optimize the weight and the first order modal frequency of this new rescue equipment.(6) The FE model is reconstructed according to the optimized scheme, and the rationality of the optimization scheme is verified, then the final design scheme is obtained.After the physical prototype experiment, the design scheme can meet the rescue function requirements. This new slide type rescue equipment make up for the shortage of the existing suspended monorail vehicle rescue equipment, and it will provide technical support for the application of this type of vehicle. This new equipment provides a powerful support for the localization of the suspended monorail vehicle.