測量一個結構的FRF至zhi少shao需xu要yao兩liang個ge通tong道dao。通tong過guo激ji振zhen力li對dui結jie構gou進jin行xing激ji勵li，需xu要yao一yi個ge通tong道dao來lai測ce量liang力li錘chui或huo激ji振zhen器qi所suo產chan生sheng的de激ji振zhen力li，還hai需xu要yao至zhi少shao一yi個ge加jia速su度du傳chuan感gan器qi用yong於yu測ce量liang結jie構gou產chan生sheng的de響xiang應ying。通tong過guo這zhe種zhong方fang法fa可ke以yi計ji算suan出chu結jie構gou的de傳chuan遞di特te性xing（FRF）和模態參數。