BI KIM TRA U VO B PHN THIT K (BI 1)1) Mt vt dao ng vi tn s tng dn u t 10Hz n 500Hz vi gia tc 200m/s2. V th tng quan bin theo s thay i tn s Nu mt my bm nc khng lu lng cp cho h thng. C mt gii php l ghp 2 bm li vi nhau, bn hy phc tho gii php V m hnh v phn tch lc h rng rc i V phc tho m hnh con i thy lc, vit cc tnh ton s lc v m hnh ny. Phn tch lc h thng n by Tnh xc sut c tng