Research On Life Prediction System For Metal Structure Of Portal Crane Based On Virtual Prototyping Technology

As one of the main tool for modern loading and unloading work, portal crane's safety is concerned by various enterprises, universities and national related detection department. The estimate for metal structure's safety life of portal crane is one of the important means to ensure its working security.At present, there are many studies in the residual safety life of metal structure, but most if them are set about theoretical algorithm direction. In addition, Virtual prototyping technology has been got more and more attention, and its comprehensive function has been applied to various kinds of fields both at home and abroad, but the apply in estimate for metal structure's safety life of crane has not been found yet. According to the problems, an estimate system for metal structure's safety life of portal crane based on the virtual prototyping technology is researched in this topic.The research object is a four connecting rod combination arm pose portal crane. Combined with the project named "crane metal structure wireless monitoring system" which is developed by intelligent instrument and testing technology laboratory in Wuhan University of Technology, the motion parameters (lifting weight, amplitude and turning angle) and the stress value of dangerous parts in dynamic load test condition and the static load test condition that collected in the opposite Physical prototyping are used to verifying the simulation data. So, the physical prototyping collection system is firstly briefly introduced in this paper, the measure point position and operating mode are secondly confirmed.Establishing a rational and precision virtual prototyping model is the first step to ensure this life prediction system. And SolidWorks, ANSYS and ADAMS are used to establishing the rigid-flexible multiply virtual prototyping model. The rigid body and flexible body modeling technology are discussed then.The kinematics and dynamics simulation for above rigid-flexible multiply model are done in ADAMS, and after the basic model calibration, a further verification of the virtual prototyping simulation results that combine with the Physical prototyping is finished in this paper to ensure the rationality and effectiveness of the model.After various mainstream metal structure life budget method are contrasted, and the basic theory of stress method of nominal stress method which is used by this topic are described, the next work is to design the human interface and system database which is appropriate for this system, and the development of the estimate system for metal structure's safety life of portal crane is finished.At the end, application examples are provided, and the compute results of different working conditions are analysed to giving advice of the portal crane's daily work which is proposed to extend its service life.