航空工程进展
航空工程進展
항공공정진전
ADVANCES IN AERONAUTICAL SCIENCE AND ENGINEERING
2014年
3期
364-368
,共5页
风洞天平%固支端长度%装配应力%有限元仿真
風洞天平%固支耑長度%裝配應力%有限元倣真
풍동천평%고지단장도%장배응력%유한원방진
wind tunnel balance%length of the clamped end%assembly stress%finite element simulation
天平在风洞模型安装过程中由于加工误差通常会产生装配应力,对元件输出值存在干扰,影响测量准度。针对此现象,采用有限元仿真方法,在保持天平总长度不变前提下,研究不同天平元件固支端长度对装配应力带来的测量准度影响情况。结果表明:只要存在装配应力,天平测量结果就会产生变化,而元件固支端长度大小对其无明显影响。因此,在风洞天平设计或实验中,提高测量准度的方法是采取措施尽可能减小天平安装产生的附加应力,而不是改变元件固支端长度。
天平在風洞模型安裝過程中由于加工誤差通常會產生裝配應力,對元件輸齣值存在榦擾,影響測量準度。針對此現象,採用有限元倣真方法,在保持天平總長度不變前提下,研究不同天平元件固支耑長度對裝配應力帶來的測量準度影響情況。結果錶明:隻要存在裝配應力,天平測量結果就會產生變化,而元件固支耑長度大小對其無明顯影響。因此,在風洞天平設計或實驗中,提高測量準度的方法是採取措施儘可能減小天平安裝產生的附加應力,而不是改變元件固支耑長度。
천평재풍동모형안장과정중유우가공오차통상회산생장배응력,대원건수출치존재간우,영향측량준도。침대차현상,채용유한원방진방법,재보지천평총장도불변전제하,연구불동천평원건고지단장도대장배응력대래적측량준도영향정황。결과표명:지요존재장배응력,천평측량결과취회산생변화,이원건고지단장도대소대기무명현영향。인차,재풍동천평설계혹실험중,제고측량준도적방법시채취조시진가능감소천평안장산생적부가응력,이불시개변원건고지단장도。
Balance in the installation of wind tunnel model of the processing error tend to produce the assembly stress .The interference of element output value affects the accuracy of measurement .In view of this phenome-non ,using the finite element simulation method ,the influence on measurement results of different balance’s fixed end length on the assembly stress is investigated based on keeping the total length invariant .The results show that :as long as the assembly stress exists ,balance measurement results will be influenced .But the length of fixed end has no obvious effect on this .Therefore ,methods of improving the measurement accuracy is to take actions to reduce the additional installation stress in wind tunnel balance design or experiment instead of chan-ging fixed end length of balance .