摘要
提出一种基于全等变换的模态转换方法，可将振动台模态试验获得的模态，转换成结构处在自由状况下的模态。对方法的合理性做了论述，并佐以例证。
An approach, based on congruent transformation, for modal transform of the structure under different boundary conditions is proposed.The main purpose is to use this approach to transform the elastic mode got from the modal test of a specimen fixed on vibrostand to the mode in freefree state of the same specimen.Two kinds of specimen constraints are considered:statically determinate and statically indeterminate. In the first case, modal matrix is constituted of elastic mode and rigidbody mode of the specimen.In the second case,released inertia forceattachment mode should be added to form the matrix mentioned above.Reasonableness of the approach is expounded and two examples are carried out to demonstrate the feasibility and effectiveness of the approach as well.
出处
《航空学报》
EI
CAS
CSCD
北大核心
1998年第4期439-445,共7页
Acta Aeronautica et Astronautica Sinica
基金
国防科技预研基金
