内埋弹舱典型结构振动响应分析与试验验证

目的提高隐身飞机内埋式弹舱结构,在武器发射时由于气流的强烈扰动产生极高的噪声和结构振动环境下的使用寿命。方法选取内埋弹舱典型结构进行随机振动响应分析,根据分析结果确定加速度传感器和应变花布置位置,并进行地面振动台振动试验验证。结果频率计算结果与扫频结果较为接近,加速度计算结果与试验结果最大误差为23.2%,应力计算结果与试验结果的平均误差基本在20%以下。结论试验前后试验件未发现工程目视可检裂纹等破坏现象,达到了规定的抗振能力,表明内埋弹舱采用的加筋结构形式合理,有限元计算结果能够满足动强度在工程上的计算精度要求。

Analysis and Test Verification of Typical Structural Vibration Response of Internal Weapon Bay

Objective To improve the internal bay of stealth aircraft and increase its service life in the environment of vibration and extremely high noise caused by the strong disturbance of air flow. Methods A typical structure of internal bayd was selected for random vibration response analysis. According to the result of the analysis; the location of the acceleration sensor and the strain sensor was determined; and the vibration test of the ground vibration station was verified. Results The result of frequency calculation was close to the result of sweep frequency. The maximum error of acceleration and test result was 23.2%. The average error of stress calculation and experimental results was basically less than 20%. Conclusion No destructive phenomena such as visual inspection cracks is found in the test before and after the test, and the required anti vibration ability was achieved. The results show that the reinforced structure adopted in the internal bay is reasonable, and the FEM calculation results can meet the accuracy requirement of dynamic strength in engineering.