63 results about "Modal superposition" patented technology

The invention discloses a dynamic response reconstruction method and system based on EMD and model polycondensation and a computer readable storage medium. According to the method, substructure division is carried out on a finite element model, then degree-of-freedom division is carried out on each substructure, modal coordinate transformation is carried out, each substructure is coupled into a super-unit model, a modal shape matrix of the unit model is solved, and modal response is extracted from measurement data through an EMD decomposition method, and finally a substructure interface response is reconstructed based on the extracted response data and the modal shape matrix. According to the method, the super-element model of the structure is generated based on the finite element model, the current time domain reconstruction method based on EMD decomposition is expanded, the modal synthesis method is used in the response reconstruction method for the first time, response information of key points is predicted through a modal superposition method, the dimensionality of a finite element model related parameter mathematical matrix is effectively reduced, the calculation efficiency ofresponse reconstruction is improved, and the method has the advantages of high accuracy, high analysis speed and the like.

The invention discloses a transient acceleration calculation method in an on-load tap-changer (OLTC) contact collision process based on a point sound source. Firstly, the outer side of the OLTC is measured; then the process of releasing energy to drive related parts by a gunshot spring in the OLTC is defined as follows: elastic force directly acts on a moving contact on an OLTC single-layer disc,so that the moving contact and a fixed contact collide with each other in a point-to-point manner, and sound wave is propagated in a point pulse manner; Then a geometric model is established, and thegeometric model is imported into Ansys analysis software to obtain a simulation model; And finally, in the simulation model, an elastic force with a preset threshold is applied, and calculating is performed to obtain the transient acceleration of the moving contact and the static contact of the OLTC contact when the OLTC contact is collided by adopting a modal superposition method. According to the method, a basis is provided for further analyzing the looseness of the OLTC spring and the faults of the contact.