测试如上图所示,定义对转速10rpm 20rpm分别定义两个load group (在list文件中称为Generalized Force Vector).
同时包含load group1,2的位移结果为只包含load group1的位移结果的两倍,故认为load group概念相当于SACS中load condition(工况)下的load ID(荷载标签)。
测试3:GEN. FORCE VECTORS等于load group数目,同一load group的不平衡荷载相互叠加(对load group3:1+1=2,见如下所示list结果)。
**** ENGINE SPEED DATA FOR SPEED NO. 1 ****
SPEED ..................... 10.00 RPM
……
GEN. FORCE NO. ........... 1
HARMONIC NO. ............. 0
LOAD GROUP NO. ........... 1
INTERPOLATION TYPE .......LINEAR
**** GENERALIZED FORCE AND MODAL RESPONSE ****
* UNBALANCED FORCE * FREQ. * MODAL RESPONSE *
MODE FREQ. DAMP AMPLITUDE PHASE RATIO AMPLITUDE PHASE
HZ PERCENT KN DEG CM DEG
1 2.149 2.000 1.000 0.000 0.078 4.2387 0.179
2 3.681 0.000 0.000 0.000 0.045 0.0000 0.000
……
GEN. FORCE NO. ........... 3
HARMONIC NO. ............. 0
LOAD GROUP NO. ........... 3
INTERPOLATION TYPE .......LINEAR
**** GENERALIZED FORCE AND MODAL RESPONSE ****
* UNBALANCED FORCE * FREQ. * MODAL RESPONSE *
MODE FREQ. DAMP AMPLITUDE PHASE RATIO AMPLITUDE PHASE
HZ PERCENT KN DEG CM DEG
1 2.149 2.000 2.000 0.000 0.078 8.4774 0.179
2 3.681 0.000 0.000 0.000 0.045 0.0000 0.000
同时该测试也表明在engine vibration分析中每个转速相当于SACS静力分析中的load condition(工况)。