CAJ | 학술논문

叶轮在运转过程中受到各种随机气动载荷的作用。分析时可以采用时域方法，用单向耦合方式求解结构的位移及应力响应，但整个多载荷步瞬态分析十分耗时。本文基于频域分析，采用虚拟激励法求解随机气动载荷作用下叶轮结构的响应问题，同时利用ANSYS谐响应分析模块及 APDL 命令流，实现了多维多点虚拟激励法在离心式压缩机叶轮的工程应用，得到叶轮结构的响应谱特征，继而求得响应的均值、方差、各阶谱矩等，为求解叶轮的超越概率以及可靠度指标等打下了基础。
협륜재운전과정중수도각충수궤기동재하적작용。분석시가이채용시역방법，용단향우합방식구해결구적위이급응력향응，단정개다재하보순태분석십분모시。본문기우빈역분석，채용허의격려법구해수궤기동재하작용하협륜결구적향응문제，동시이용ANSYS해향응분석모괴급 APDL 명령류，실현료다유다점허의격려법재리심식압축궤협륜적공정응용，득도협륜결구적향응보특정，계이구득향응적균치、방차、각계보구등，위구해협륜적초월개솔이급가고도지표등타하료기출。
Impellers are loaded in the operation process under the action of various random aerodynamic forces. Time domain-based methods can be used in displacement and stress analyses with one-way coupling strategy. However, the entire multiple load steps for transient analysis are extremely time-consuming. In this paper, the pseudo-excitation method based on frequency domain analysis is adopted to solve the random response problems of the impeller under the action of aerodynamic load. The multi-dimensional, multiple point virtual excitation is applied to the impeller through harmonic response analysis provided by ANSYS and the ANSYS APDL commands to obtain the response spectrum characteristics of the impeller structure. The mean value, variance and orders of moment etc. of the response spectrum are then determined, which lays a foundation for solving the probability and reliability index of the impeller.