Research And Development Of The Test System Of The Crane Frame

Frame of truck crane is a complex plate girder structure bearing spatial force system. Study onfatigue strength of this structure is consistently challenged by various influential factors,including material handling, construction technology, environmental conditions andmechanical performance parameters. It is computationally intractable, even for the mostadvanced and accurate calculation method, to take all these factors into consideration,therefore, it is essential to make full use of experimental technique to reveal problems underactual use conditions.This paper studies one certain kind of truck crane based on the theory of structural mechanicsand engineering experimental design. Contributions of this paper are threefold: designed theframe simulation loading platform, developed a practical stress acquisition system andproposed a determining method of test loads.The main contents of this paper are as follows:Firstly, this research analyzed the force status of the frame, designed the frame loadingsimulation system and determined the index of the electro-hydraulic servo loading system.Furthermore, this research implemented a robust test-bed and mounting fixture that arecompatible to different structure sizes and test circuits of the frame. The test-bed is capable ofmulti-channel coordination control under a large displacement and big load, and variousforce-bearing simulations under the work of the frame by applying load to the frame legs.Secondly, this research developed a software system of the test platform to facilitatefunctions of the loading&test system. Characterized by accurate loading control, convenientparameters setting and user-friendly interface, the developed system is capable of efficientdata processing, storage and searching. In addition, it can generate test reports automaticallyaccording to different test contents.Thirdly, this research surveyed existing researches on anti-force calculation methods of legsframe and proposed the necessityto consider the deformation of the beam frame and theoutriggers simultaneously when calculating the reactive forces of truck cranes. Moreover, amathematical model was formulated to obtain legs anti-force. This model could better reflect the magnitude of reaction force and change rule, which provided theoretical basis fordetermination of load spectrum of the test-bed.Finally, actual test of developed functions validated that the developed could better simulateforce state of the frame, improve speed and accuracy of the fatigue life test of the crane frameand promote the design and research on crane frame.