Mechanical-Hydraulic Co-Simulation And Experimental Research On Hydraulic Telescopic System Of Truck Crane

Truck crane is one of the main varieties of construction machinery, is also a general-purpose operating crane that has wide use range and strong applicability. The boom is an important component of truck crane, its performance will directly affect the whole security, lifting performance and economic benefits. The crane boom can be divided into truss boom and box boom. Now the hydraulic driven telescopic box boom is used widely. Lifting performance of the boom is very important to the truck crane, so exploring the scientific and rational approach to improve the performance of the boom must be solved in the modern crane design.With the development of science and technology, especially computer technology, the use of computers as tools to study the dynamic characteristics of the actual system has become possible. Simulation technology has now become an indispensable means to analysis system, research and design. It plays an increasingly important role in reducing system cost and improving the safety performance tests and training. The technology has also become an important tool of crane design.This paper mainly applies the computer simulation technology, carries out the rigid-flexible coupling model of the mechanical system and simulation by using the software LMS Virtual.Lab Motion, accomplishes the hydraulic system model and simulation by using the software AMESim, completes the co-simulation of the mechanical sysytem and the hydraulic system, and analyses dynamic characteristics of the telescopic system.This paper takes the telescopic system with double-cylinder and five booms as the object. It mainly researches the following work:1. The development of domestic and international overview of the truck crane is described. The development of the truck crane telescopic system from the structure, dynamic forms and telescopic ways is introduced. The concept of computer simulation and virtual prototype technology and application in crane design are discussed.2. The concept of mathematical model is introdued simply. The working principle of telescopic hydraulic system is described. The multiway valve and the hydraulic system simulation model are established by using software AMESim. Various parts of the model selection and parameter settings are dissertated. The model is simulated and analysed.3. Mechanical structure of the telescopic system is introduced. The mechanical model is built by using software LMS Virtual.Lab Motion. In order to fully consider the deformation of the boom, using the finite element method, rigid body model is treated with flexible body. The rigid-flexible coupling model is simulated and analysed. The simulation results show that the simulation model can reflect the actual work.4. The co-simulation between the mechanical system and the hydraulic system is carried out by using the good interface joint of AMESim and LMS Virtual.Lab Motion. The software interface and parameter settings are discussed. After the system co-simulation is completed, the simulation results are analysed. The simulation results show that the co-simulation can reflect the actual work of the system better than the single simulation.5. Experiment was carried out to study the hydraulic system of the telescopic system. The experiment process is introduced. The test results and simulation results are compared, and the results show that the simulation model can reflect the actual work. Simulation model is researched further on this basis, and several factors that affect system performance are analyzed to study the dynamic characteristics of the system. The energy-saving measure is put forward based on the research results. Finally, the improved design of the hydraulic system is proposed.The main innovation of this paper are the following:1. The coupling simulation of the telescopic system is accomplished by using software LMS Virtual.Lab Motion and AMESim. This method can better simulate the real load and improve simulation accuracy.2. In order to make the telescopic process more smoothly, the improved suggestion of adding an accumulator is proposed.The research results of this paper have some practical value in engineering and important reference value in the design and performance improvement of truck crane telescopic system. The application of the research method can improve the development efficiency, shorten the product development cycle, save the costs and better optimize the design of the product. It is significant to improve the technological level of domestic crane.