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Research on Automotive Panel Stiffness Evaluation and Measurement System

Author: ZhaoDong
Tutor: XingZhongWen
School: Harbin Institute of Technology
Course: Mechanical Manufacturing and Automation
Keywords: Automotive panel Stiffness Evaluation Measurement and controlsystem
CLC: U466
Type: Master's thesis
Year: 2013
Downloads: 4
Quote: 0
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Abstract


In the automotive panel manufacturing process, the stiffness evaluation andmeasurement have a crucial impact on the quality and the performance ofautomobile. Nowadays, the automotive industry comes into a high-speeddevelopment stage. New development trends of automobile are energy saving,environmental protection and conservation. In order to achieve energy savingvehicles, the automotive manufacturing industry made of lightweight newrequirements. More and more pieces of sheet metal used in the manufacture ofautomobile cover, greatly reducing vehicle weight. Since the thickness of the sheetmetal parts are small (usually less than0.8mm), so the rigidity is generally relativelysmall. In the process of moving, exterior body panels cover is subjected to externalforces, such as the press, touch, vibration, shock and other loads. If the body panelstiffness is low, the car in motion the process appears tremors, deformation, noiseand other problems that affect the driving experience even driving safety. Today,many automobile manufacturers and research institutions in the automotive panelstiffness evaluation and measurement lack of uniform standards and the automotivepanel stiffness measurement and control equipment based on the standards, thereforeit can’t give the scientific and accurate evaluation conclusions of the automotivepanel stiffness. Therefore, the research on automotive panel stiffness evaluationsystem and measurement system is very necessary.Through the research of the stiffness rule, summarized four ways to evaluate theautomotive panel stiffness. To improve the evaluation methods with the analysis ofproduction practice and other aspects, and proposed the automotive panel stiffnessevaluation system based the slope of the initial point. This method select the amountof deformation occurring0.3mm to1.3mm load-displacement curve to have aquadratic fit, and choose the slope of the initial point as the automotive panelstiffness.Give a comprehensive exposition of the automotive panel stiffness measurementand control system from the aspects of hardware and software. The hardware part ofautomotive panel stiffness measurement and control system is a distribute system consists of the PLC lower machine and the PC host machine. From the PLCprogram design, interface design, class design lower machine interfaces design andseveral other aspects to design the software part. Use the C++language to designthe software programs, completed the stiffness test, result analysis, report generation,and a series of functions.Finally, select several typical automobile panels which are commonly used inthe actual production, conduct the stiffness tests with the measurement and controlsystem. Experimental results show that the method based on the slope of the initialpoint evaluation system consistent with the law of rigidity theory, and accuratelyreflects the factors on the impact of automobile panel stiffness. While also verifiedby the test results of the system accuracy, stability and usability.

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CLC: > Transportation > Road transport > Automotive Engineering > Automobile manufacturing process
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