CAJ | 학술논문

大型机械装备关键部件工况恶劣，易产生应力集中并导致发展为宏观缺陷。设计开发一套交变应力测量系统，系统包括测量传感器、DDS信号激励模块、信号调理模块、信号采集与处理模块。基于电磁理论设计优化U型磁轭传感器，依据互相关原理设计信号调理模块，并利用该系统对受载Q235钢进行应力测试。实验结果表明，ΔBx 参量随激励电压有显著变化，当激励电压为5 V时，ΔBx 变化较小，构件屈服后仅有10 mV变化，激励电压为19 V且载荷为300 MPa时ΔBx 达到98 mV。构件在弹性阶段ΔBx 与应力呈线性变化，屈服后迅速增大；ΔBz 变化较小且规律复杂，不适宜对应力进行评估。结果表明该系统为铁磁构件的应力测量提供了一种有效的测试方法。
대형궤계장비관건부건공황악렬，역산생응력집중병도치발전위굉관결함。설계개발일투교변응력측량계통，계통포괄측량전감기、DDS신호격려모괴、신호조리모괴、신호채집여처리모괴。기우전자이론설계우화U형자액전감기，의거호상관원리설계신호조리모괴，병이용해계통대수재Q235강진행응력측시。실험결과표명，ΔBx 삼량수격려전압유현저변화，당격려전압위5 V시，ΔBx 변화교소，구건굴복후부유10 mV변화，격려전압위19 V차재하위300 MPa시ΔBx 체도98 mV。구건재탄성계단ΔBx 여응력정선성변화，굴복후신속증대；ΔBz 변화교소차규률복잡，불괄의대응력진행평고。결과표명해계통위철자구건적응력측량제공료일충유효적측시방법。
The key parts of large machinery are most worked in poor conditions,which is easy to produce stress con-centration and leads to macroscopic defects. An alternating current stress measurement( ACSM) system is designed, which includes measuring sensor, DDS signal generator module, signal adjusting module, signal acquisition and processing module. The U-shaped sensor is optimized based on electromagnetic theory. According to the principle of correlation,signal adjusting module is devised. The stress measurement experiments of loading Q235 steel are carried out by the system, the laws are presented in the test, which show that ΔBx has significant change with excitation voltage,the maximum of ΔBx is only 10 mV when voltage value is 5 V,but ΔBx can reach 98 mV when voltage value is 19 V and load is 300 MPa.ΔBx has linear variation with stress in the elastic stage and increases rapidly over yield point,the change of ΔBz is small and complicated,so the ΔBz is unfit for stress assessment. The results show that an effective method for stress measurement on ferromagnetic structure is provided by the system.