CAJ | 학술논문

采用叶轮流体力的简化方式可以提高离心泵流体激励诱发振动的计算的准确程度。根据达朗伯原理对试验台架建立了包含离心泵基座的四圆盘三轴段转子动力学模型；将流体力分别简化为叶轮内20%流体质量、40%流体质量、CFD集中力与力矩，采用Newmark-隐式算法对转子动力学模型进行瞬态响应分析。结果表明，将叶轮上流体力简化为CFD；所得集中力与力矩时；可有效得出离心泵运转过程中流体激励所诱发的基座振动。而所获得的基座振动位移与加速度幅值均远大于将流体力简化为叶轮内20%或40%流体质量所获得的基座振动数值。另一方面，将流体力简化为叶轮内40%流体质量所获得的基座振动大于简化为叶轮内20%流体质量所获得的基座振动。
채용협륜류체력적간화방식가이제고리심빙류체격려유발진동적계산적준학정도。근거체랑백원리대시험태가건립료포함리심빙기좌적사원반삼축단전자동역학모형；장류체력분별간화위협륜내20%류체질량、40%류체질량、CFD집중력여력구，채용Newmark-은식산법대전자동역학모형진행순태향응분석。결과표명，장협륜상류체력간화위CFD；소득집중력여력구시；가유효득출리심빙운전과정중류체격려소유발적기좌진동。이소획득적기좌진동위이여가속도폭치균원대우장류체력간화위협륜내20%혹40%류체질량소획득적기좌진동수치。령일방면，장류체력간화위협륜내40%류체질량소획득적기좌진동대우간화위협륜내20%류체질량소획득적기좌진동。
Simplification of the fluid force applied on impeller can significantly raise the accuracy of computation of centrifugal pump vibration incited by the fluid. In this paper, a rotor dynamic model including four discs, three shaft sections and a pump base is built for the workbench based on D'Alembert principle. Then fluid force on the impeller is simplified as 20 % fluid weight in impeller, 40 % fluid weight in impeller, and a concentrated force as well as a torque by CFD respectively. Finally, the transient response analysis is carried out by Newmark-implicit algorithm. The result shows that the base vibration incited by the fluid force during centrifugal pump operation can be effectively gained by simplifying the fluid force on the impeller to a concentrated force and a torque, and the amplitudes of acceleration and displacement of the base vibration by simplifying the fluid force to concentrated force and torque are much larger than those by simplifying the fluid force as 20 % and 40 % fluid weight in the impeller respectively. Also, the acceleration and displacement amplitudes by 40%fluid weight in the impeller are larger than those by 20%fluid weight in the impeller.