Nonlinear Analysis Of Super Lift Device And Main Telescopic Boom Performance Of All Terrain Crane

All terrain crane is rapidly developed and widely used in the construction of large-scale essential projects and the installation of wind power, nuclear power and field military equipment. As the most frequently used structure combination of all terrain crane, the reasonable analysis and calculation of the main boom and the super lifting device are very important. They can improve lifting performance and design accuracy and reduce operation frequent failure rate. In this paper, a lots works have been done to solve the problems that domestic all-terrain crane boom system precision design start late and the research foundation is weak. Nonlinear analysis has been done for the main boom working conditions and the main boom with super lift device working conditions. The mechanical characteristics and reasonable way of working are summarized. In order to achieve above objectives, the main research contents are as follows:Firstly, the amount of telescopic boom combination form is large and the calculation and design needs huge work. The rapid modeling software is developed in this paper to establish and analyze the model quickly to solve this problem. The modeling and analysis of the main boom working condition and the main boom with the super lift device working condition are included. And the training and prediction of the BP neural network which is used to predict the axial force of the super lift cable is also included.Secondly, there are many kinds of telescopic combination way to reach the same arm length. The stress and displacement of the main boom are different in different ways. In this paper, the stress and deformation laws of the main boom are obtained by using the nonlinear analysis with the mechanical characteristics of the boom. The result can improve the performance of all terrain crane.Thirdly, there is pre-tensioning condition of the super lift device which increases lifting capacity. After the pre-tensioning of super lift device, although it can improve the lifting capacity, it will lose the horizontal space. And the bearing capacity of the pin hole will also limit the increase of the tension of the super lift cable. Thus, taking boom head not falling as the purpose and taking the transverse space into account, this paper uses nonlinear analysis to determine the tension of super lift cable. And the influence of the boom angle and the angle between two super lift poles on the tension of the super lift cable is analyzed.Finally, since determining the tension of super lift cable need repeated calculation, and the finite element analysis is time-consuming, BP neural network is used to predict the tension of super lift cable in this paper. Through various tests of the hidden nodes and the number of training, they are determined, and samples are used to test the accuracy.Through the above research, this paper obtained some basic rules of the precise design of boom system, which has engineering significance to improve of the design level and operational safety.