Verification Device Of 3D Four-wheel Aligner And Its Optimization Design

With the development of our country's economy and the improvement of people's living standard, there is the increasing number of vehicles owners in our country year by year. Then, now many people pay more attention to the vehicle safety. Four-wheel alignment, as an important indicator of the quality of vehicle safely moving, attracts the attention of departments of traffic management, of departments of technology supervision, of automobile manufacturing enterprises, of vehicle maintenance industry, of drivers.The parameters of Four-wheel alignment must be severely detected before vehicles leave the factory, so as to ensure vehicles can run safely. The change of the wheel alignment parameters may result in some serious problems after vehicles run a long time, such as instability in the operation, the abnormal wear of tyre, difficulty in the operation of the steering.The main parameters of Four-wheel alignment include: toe angle, camber, kingpin inclination, caster angle, thrust angle. These parameters must be corrected by Four-wheel aligner, and then we'll have a safe drive. Currently, the widely used Four-wheel aligner depends on the technology of Image-processing. High-resolution cameras capture the image information on the reflect panel, and then calculate Four-wheel alignment parameter by Image-processing. Compared with the traditional Four-wheel aligner, the new one use the reflect panel instead of the traditional sensor installed sophisticated optoelectronic device. The new Four-wheel aligner has more advantages, such as convenient clamping, simple operation, rapid detection and high precision.3D Four-wheel aligner has many advantages, such as convenient detection and small floor space. But still, there is no accurate method to roundly measure this device's all technical indicators. In this situation, this paper develops an Image Four-wheel aligner verification device. The device has high detection stability, and its measure accuracy can completely reach the accuracy that 3D Four-wheel aligner verification needs, and can veritably simulate the main location parameters of vehicle Four-wheel alignment to meet the verification needs on the kind of Four-wheel aligner of measurement departments, related scientific research institutions, authoritative detection departments of government agency, large and medium enterprises, related academies and other related institutions.This dissertation mainly discusses the verification principles and methods of 3D Four-wheel aligner, and studies the verification device's mechanical structure and its optimization. I use the ANSYS software to make finite element analysis on the important parts of testing equipment. On this basis, I make the structural optimization design, aimed at saving materials, reducing the quality, improving the operability and making the device more convenient to carry, so as to find an optimal structure design. Engineering design based on rigorous, meticulous and precise analog computation gets a reasonable analysis result on structure rigidity and detecting precision, and further optimization design make structure design more reasonable. Finally, I study how to combine three-dimensional design software"Solid Works"with finite element analysis software"ANSYS", and then point out some compatible problems which easily result in solution failed, which indicates that the combination of CAD and CAM will be a promising development direction of engineering design.The verification device of 3D Four-wheel alignment is a complex system. This paper focuses on structure design and analysis. As to more questions and details, further studies are still needed.