CAJ | 학술논문

动力机械转速在其范围内变化的动态工况共振幅值特性,对动力机械强度分析和试验参数设定等问题有直接影响.首先应用杜哈梅积分对动态工况激振力响应进行理论分析,发现动态工况激振力的响应无解析解,但可利用数值积分法进行仿真分析.通过仿真分析得到动力机械动态工况共振幅值随提速率的增加逐渐减小,当提速率较低时动态工况共振幅值逐渐接近稳定工况共振幅值的结论.最后利用4100 QB型柴油机扭振共振幅值和JFZ172 L型发电机结构共振辐射噪声声压级随提速率变化规律进行试验验证.
동력궤계전속재기범위내변화적동태공황공진폭치특성,대동력궤계강도분석화시험삼수설정등문제유직접영향.수선응용두합매적분대동태공황격진력향응진행이론분석,발현동태공황격진력적향응무해석해,단가이용수치적분법진행방진분석.통과방진분석득도동력궤계동태공황공진폭치수제속솔적증가축점감소,당제속솔교저시동태공황공진폭치축점접근은정공황공진폭치적결론.최후이용4100 QB형시유궤뉴진공진폭치화JFZ172 L형발전궤결구공진복사조성성압급수제속솔변화규률진행시험험증.
The resonance amplitude characteristics of power machinery in dynamic conditions have a direct influence on the mechanical strength analysis and the test parameters setting. Firstly, theoretical analysis with the use of Duhamel integral was done for analyzing the response of the power machinery in forced vibration conditions. But, no analytical solution could be found. So, the method of numerical integration was applied for simulation of the resonance amplitude. It is found that the resonance amplitude decreases gradually with the increase of rotary acceleration of the machine. When the acceleration decreases to some low value, the resonance amplitude will reach a steady value. Finally the resonance amplitude characteristics of the torsional vibration amplitude of 4100QB diesel engine and the sound pressure level of the radiation noise in the resonance condition of JFZ172L generator were tested experimentally for verification of above-mentioned laws.