| More and more tunnels have been constructed or being under construction in ourcountry, in order to ensure the safety of the tunnels, the advanced techniq ue of theinfrared scanning must be used to detect the conditions of the tunnels. Now, the loadvehicles used for tunnel detection are all manufactured by foreign countries. There isno research and production of such vehicle in China.The research object of this article is the load vehicle, manufactured by theauthor’s institute, exclusively used for the tunnel detection. The research hasestablished the detailed finite element model of the load vehicle body structure.Aiming at several typical operation situations usually occurs while the loadvehicle working, the author analyzed and calculated,with the NASTRAN software,the locations where the maximum stress focuses on the load vehicle body structureand the maximum shifting deflection of the load vehicle, as the load vehicle runningwith the uniform velocity passes over the road surface obstacles, leading to four kindsof results: one wheel hanging in the air or raising a little instantly, taking sharp turningor emergency breaking, so that we can confirm whether the strength and the stiffnessof the load vehicle body structure could satisfy the design and operational requirementofour customers.On this basis, the inherent frequency and relevant vibration model of the bodystructure have been obtained by computational analysis of the first ten free models ofthe load vehicle body structure.The research of this article shows that, the strength and stiffness of the loadvehicle body structure could meet the design and operational requirement of thecustomers.The solidity and rigidity of the framework, as showed in our research, meet the project requirements in all typical construction scenarios. The maximum stress of the framework structure falls upon the part where the jutting section in the front joins with the longitudinal and transverse beams on the top. The actual stress, nonetheless, does not exceed the limit strength of the framework material. Under normal circumstances of operation, the distortion rate observed in the framework has been insignificant. When the carrier operates at an even speed on the B level or C level road, the displacementof the camera is minimal, and the definition of the scanned image is safely guaranteed. The carrier has satisfied all the requirements demanded by our client. |
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