Simulation Analysis On Bridge-inspect Vehicle's Arms Structure

Bridge-inspect Vehicle is a new kind of special purpose motor vehicle, which is used for bridge flow test and maintenance operation, and is also the ideal vehicle for all kinds of highway bridges'detection and maintenance. The development of bridge inspection vehicle in our country started a little behind, so the technology is still not mature. As an important part of the Bridge-inspect Vehicle, the arm structure is less comprehensive. The arm structure carrying staff and testing equipment, so there is a very high requirement of the arm structure's rigidity and intensity. In addition, the sophisticated dynamic response is also one of the control factors of structural designin. For this reason, it is valuable in theory and in practice for the analysis of static analysis for the vehicle's structure of the arm, and of the response of vibration under wind load and reliability of fatigue.In this dissertation, the research object is some kind of bridge inspection vehicle which is developing, through the finite element analysis software HyperMesh, from beam column unit and shell unit to establish the finite element modal. From selecting seven typical working conditions, calculating the static strength, rigidity through finite element method and through the structural electrical logging test, the accuracy of the finite element modal and computational method can be tested. On this basis, the structures can be got and analyzed which are before the 10 intrinsic modes through the analysis of the structure's natural characteristics. Addressing the characteristics of long cantilever arm structure, the wind load bears the main load of the power. Based on random vibration theory of frequency domain method, this dissertation calculates the wind vibration frequency response, and verifies the rationality of the structural design. And at the same time, this paper calculates the wind vibration time domain response, through adopting Davenport wind spectrum simulated and using numerical integration based on time domain method, and use the design code of the crane to test the margin of safety. Finally, integrating static analysis results, fluctuating wind load and the S-N curve, and using the nominal stress method to calculate the life-cycle boom structure, the reliable structural life-span can be got and it is available to evaluate the fatigue evaluation according to relative specifications.There are some important conclusions can be got from analyzing the results of static of Boom structure, of structural electrical test, of wind and structural fatigue. These conclusions will provide a theoretical basis for the design of Bridge-inspect Vehicle arm structure and further improvements, and will achieve good results in product development.