论文部分内容阅读
通过对C/SiC陶瓷基复合材料螺栓连接件的模态进行计算和试验分析,确定了其模态参数和振动响应特性;然后通过对C/SiC陶瓷基复合材料螺栓连接件进行正弦扫频振动试验,研究了拧紧力矩对螺栓连接件振动性能的影响规律;最后研究了液态聚硼硅氮烷(L-PBSZ)对C/SiC陶瓷基复合材料螺栓连接件防松性能的影响。研究结果表明:一阶和三阶固有计算模态频率与试验模态频率一致,因此可以采用有限元分析方法对C/SiC陶瓷基复合材料螺栓连接件进行振动响应特性分析;采用正弦扫频振动频谱信号差值曲线分析方法可以检测螺栓连接件是否松动;SEM观察表明,L-PBSZ改性的C/SiC陶瓷基复合材料螺栓连接件的螺纹副间形成陶瓷填充体,使得螺纹与螺母间有效摩擦系数和有效摩擦面积增加,因此螺母松脱退出的力矩增大,提高了C/SiC陶瓷基复合材料螺栓连接件的防松可靠性能。
The modal parameters and the vibration response characteristics of the C / SiC ceramic matrix composite bolted joints were calculated and tested. The sinusoidal sweep vibration The influence of tightening torque on the vibration performance of bolted joints was studied. Finally, the effect of liquid polyborosilazane (L-PBSZ) on the anti-loosening properties of C / SiC ceramic matrix composite bolted joints was studied. The results show that the first-order and third-order inherent modal frequencies are consistent with the experimental modal frequencies. Therefore, the vibration response characteristics of the C / SiC ceramic-based composite bolted connections can be analyzed by finite element analysis. Spectrum analysis of the signal difference curve can detect whether the bolt connection loose; SEM observation shows that, L-PBSZ modified C / SiC ceramic matrix composite bolt connector between the formation of ceramic filler body, making the effective between the thread and nut The coefficient of friction and the effective friction area increase, so the torque that the nut loosens and exits increases, which improves the anti-loosening reliability of C / SiC ceramic matrix composite bolted joints.