| With the rapid development of special vehicle technology,the demand for on-board transport platform performance has increased.The existing transfer operation platform is mostly hydraulic system operation,the poor dynamic characteristics,the components deformation at work,and difficult to achieve accurate transmission when leveling,and affect the stability when the equipment carried,taking into account the high accuracy of hydraulic parts and its Strict assembly requirements,relatively susceptible to the surrounding environment,the failure is not easy to check and other factors,for the existing vehicle transport platform design of large telescopic than the motor lift truck transport platform,so that the device has the following functions: As a lifting platform,the use of large expansion than the two-stage composite legs,the small installation space,which can make the vehicle platform center gravity low,while the car equipment to meet the rapid accuracy of a certain height;as the transport platform,such as the frame deformation is small when the transport,the vehicle impact is small;large telescopic than the transport platform in the delivery of special precision instruments,mobility and anti-interference ability.Then,the parametric finite element model of vehicle transit operation platform is established in SOLIDWORKS,and the load spectrum of tire grounding point under each condition is analyzed.And then the dynamic response characteristics of the platform under the random input of the road are obtained.Finally,the modal analysis carried out via ANSYS,the stress analyzed via random vibration analysis,the structure of the transshipment platform analyzed,the model improvement proposal is given and the reliability is improved based on the analysis of the relationship between road frequency and time frequency power density,a model of pavement random signal generation is established,and the vehicle dynamics model of vehicle transit operation platform is established.The experiment is carried out by using continuous eight-wheel flatness tester Pavement parameters,and according to the measured parameters to establish the corresponding road surface spectrum,through the comparison to verify the road spectrum and vehicle dynamics modeling the correctness,and then in different road,different speed,different suspension parameters were compared vehicle transport platform The dynamic characteristics.Using the force method to the force hammer as the excitation source,measured the free mode of the frame and the vehicle,and then through the simulation and the vehicle and the vehicle between the free mode contrast,modify the finite element model,And the source of the error is provided for the simplification of the model.At the same time,the modal identification of the vehicle transportation platform is carried out.Through the acquisition and analysis of the working mode parameters of the vehicle on the same road speed,the working mode The results show that the results are in good agreement with the vehicle free modal test,and the results show that the model and the modal test scheme are highly reliable.In this paper,the dynamic and static dynamic analysis of the finite element model of the vehicle platform and its modal test are carried out,and the error source is analyzed and the practical application of the modal analysis is also discussed.The results show that the working mode method of vehicle transit platform can identify the modal parameters of the vehicle,indicating that the method is feasible. |
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