Analysis Of Contact Problems And Study Of Regularity On Telescopic Boom's Sliders

As one of the main components, telescopic boom is widely used in the construction mechanics production, such as truck crane and aerial working platform. Performance characteristic of the whole crane is affected by boom structure quality and force distribution. The load is conveyed between booms by the contact of top-bottom sliders. And the contact regions are dangerous places. Coupling DOFs technologies are adopted to simulate the contact regularity between telescopic booms and sliders in the practical, the result turn out to be stress concentration. In order to understand the actual relationship between the telescopic booms and sliders, contact analysis is done in this paper.First, the real affection between telescopic booms and sliders is analyzed, several algorithm is contrasted and then resonable mathmatical model is established.Second, trapezoidal cross-section of aerial working platform is the researching object, and nonlinear finite element model of overlapping parts between the telescopic booms is built. Contact element of ANSYS is used to establish the contact couple between the outer bottom slider and the inner top slider, which is applied to study the contact correlation between the boom surface and slider surface. Adopting mapped meshing, appling boundary conditions and load step to the model slecting the appropriate parameter and reasonable contact zones to analyze the aimed problem.Then, the paper analyzes different simplified model of telescopic booms overlapping parts. Five methods are researched to simulate the contact problems between telescopic boom and slider, conclude the simplified linear method which is closer to the nonlinear contact method to the others.Finally, the paper analyzes the impact of parameter variation, which caused by the supporting position and the length of the sliders,. to the largest stress of both telescopic booms and top-to-bottom sliders, the most displacement, the biggest contact pressure and penetration allowance under the different typical conditions.