Railway Vehicle Seat Interface Digital Design And Its Comfort Simulation

Pursuing the sitting comfort with high quality is the inevitable demand for the development of railway passenger transportation. To study the riding comfort of railway passenger vehicles with advanced theoretical analysis model and computer simulation technology is the crucial sections to ensure the running quality of vehicles. However, quantitative analysis method and evaluation model for analyzing the sitting comfort with consideration of various human body characteristics are lacking in previous research of static comfort. In addition, the outer structural design of train seat and the arrangement of train seats in carriage and other issues have not been effectively resolved. In this paper, systematical studies are carried out in the support of a CAD software platform in order to solve the above problems. The detailed contents are as follows:In order to meet the geometric matching needs between the different percentile size of seated human body and seats, realistic and accurate three-dimensional sitting human body prototype model is established by the geometric and feature modeling technology. Furthermore, the three-dimensional sitting human models with different sizes and gender are modeled in a parameter way by CAD secondary development and size driving technology.An adaptive matching method for the "human-seat" three-dimensional CAD model is proposed and implemented in a program-driving way. In the support of this method, the seated human and seat three-dimensional CAD model can be automatically matched by each other, and the angle values of the human body sitting posture can be automatically extracted. Furthermore, a theoretical model to analyze and evaluate the geometric comfort of train seat is proposed based on gray comprehensive evaluation method. The geometric comfort of different train seats can be quantitatively analyzed and compared by the model.According to the lumbar curvature arc and the human sitting ergonomic principles, a parametric design of new train seat is realized by constructing the relationship between the anthropometric dimensions and the structure size of seat.The methods and principles for the train seat arrangement are studied by the ergonomic principles, and a mathematical model and the process of train seats arrangement is designed by the requirements both Train passenger compartment dimensions and the safety requirements for train construction. What is more, the intelligent layout for train seats can be achieved by the developed software in the three-dimensional CAD environment.On the basis of the above works, the train seat comfort simulation software has developed by SolidWorks API. The comfort analysis of train seats, the parametric optimization design of the train seat and the intelligent layout of train seats can be implemented in the visual environment constructed by the software.