例2:多输入随机响应分析 问题 Using the modal method, determine the displacement response trum of the tip center point due to the input spectrum of the pre and point loads listed below. Use the complex matrix represent (SAB)for the cross spectrum Autospectra of Pressure load Auto Spectra of Corner Load Frequency(Hz) psi/Hz Frequency(Hz) lb/Hz 0.1 0.5 30 30 2.5 100 2.5 500 0.1 1000 1000 0.1 Cross-Spectrum of Pressure and Corner Loads Real/Imaginary Frequency(Hz) Real Part Imaginary Part 0.099619 0.007816 100 -0.498097 0.043579 500 0.070711 0.070711 1000 0 输入文件 工 D SEMINAR,PROB11 SOL 111 TIME 30 CEND TITLE= FREQUENCY RESPONSE WITH PRESSURE AND POINT LOADS SUBTITLEE USING THE MODAL METHOD WITH LANCZOS ECHOE UNSORTED SPC= 1 SET111=11,33,55 DISPLACEMENT(PLOT, PHASE)= 111 METHOD= 100 FREQUENCY= 100 SDAMPING= 100 RANDOM- 100例2：多输入随机响应分析 问题： 输入文件 ID SEMINAR, PROB11 SOL 111 TIME 30 CEND TITLE= FREQUENCY RESPONSE WITH PRESSURE AND POINT LOADS SUBTITLE= USING THE MODAL METHOD WITH LANCZOS ECHO= UNSORTED SPC= 1 SET 111= 11, 33, 55 DISPLACEMENT(PLOT, PHASE)= 111 METHOD= 100 FREQUENCY= 100 SDAMPING= 100 RANDOM= 100