Variable Falling Control Of Mobile Crossbeam For Composite Press

Composite press is the key equipment for composite material molding,which is widely applied in the hi-tech fields of aerospace,automobile and new energy power generation by virtues of quick molding,high automation and once molding for pieces with complicated surface.With the development of industrial technology,the molding technique of high precision and high performance has become the trend in the study of composite press.The running stability of composite press is essential for molding,while optimizing the variable falling control system of crossbeam is an important way to improve the system stability.At present,the control order plan and flexible docking strategy of variable falling control system are usually designed by experience,which has become the bottleneck to further enhance the performance of composite press because of the shortcomings of low adjusting efficiency,time consume and poor stability.Based on the variable falling control system of crossbeam,this paper propose a new approach to restrain the vibration and impact of crossbeam during falling process and makes analysis and test on its optimization.Firstly,based on the analysis on process requirements of composite press,this paper shows a variable falling electro-hydraulic servo control system.This paper determines the key factors that affect the stability of variable falling motion of crossbeam after making a full analysis on the main structure,working principle and process flow of composite press,on which basis to propose a solution to prompt the vibration performance of composite press,and then designs the variable falling electro-hydraulic servo control system and its key parts according to the technology requirements of composite press molding.Secondly,based on the kinetic analysis on electro-hydraulic proportional valve control cylinder system,this paper establishes the mathematical model of variable falling control system of crossbeam.According to the kinematic and dynamic analysis of variable falling control system,this paper establishes a mathematical model of proportional valve control cylinder system and conducts a full analysis on its dynamic and static response performance and control stability so as to decide the specific control pattern of crossbeam and leveling cylinder.In the meantime,this paper identifies system model by applying neural network algorithms based on the collected experimental data to build up the non-linear mathematical model of variable falling control system of crossbeam under the control of proportional cartridge valve.Thirdly,applying mathematical model to analyze the motion characteristics of crossbeam at variable falling speed and docking system,this paper puts forward an optimal scheme to restrain vibration.Based on the analysis on the motion characteristics of crossbeam at variable falling speed under different command trajectories,this paper designs a vibration suppression optimization based on spline interpolation function,proposes a leader-follower collaborative control strategy based on feed-forward compensation by combining the collaborative control features of crossbeam and multiple cylinder,and compares the design with traditional one to analyze the advantages of aforesaid control strategy.Finally,based on the experimental platform of variable falling control system of crossbeam,this paper conducts experiments to test the before-mentioned optimal control strategy by designing test plan of variable falling control system to test the reliability of mathematical model.Based on the designed optimization command trajectory and combined with numerical analysis and experiment results,the feasibility and effectiveness of proposed approach are compared and verified.The innovation of this paper is to propose a new approach for crossbeam variable falling control on the basis of optimal command trajectory and make a full analysis on its vibration suppression performance,which can facilitate the stable swift of operation speed of crossbeam during falling process.Meanwhile,as to the docking process of crossbeam and leveling cylinder,this paper puts forward a leader-follower collaborative control strategy based on feed-forward compensation to study the stability during docking process through numerical experiment,which provides a new idea for the vibration suppression of variable falling control system for crossbeam in composite press.