Quick forecast method for broadband line spectrum vibration noises of floating raft structure

• Main Authors: TIAN HONGYE, CHEN HAILONG, LIU JIANGTAO, DU YUAN, SHEN ZHE, YU BOTIAN, PANG FUZHEN, LI SHUO, SHAN YANHE, PENG DEWEI
• Format: Patent
• Language: Chinese; English
• Published: 20.07.2018
• Subjects: CALCULATING; COMPUTING; COUNTING; ELECTRIC DIGITAL DATA PROCESSING; PHYSICS

The invention provides a quick forecast method for broadband line spectrum vibration noises of a floating raft structure. A broadband line spectrum vibration response of the floating raft structure can be quickly obtained through single analysis. A time domain analysis finite element model of the floating raft structure is built; a time history vibration signal a of a device on a floating raft serves as an input load; by reasonably controlling a time increment step length delta t and model calculation time Ttotal, the time domain simulation calculation of the broadband vibration response of the floating raft structure is carried out to obtain a time domain response x(t) of a typical structure of the floating raft; a steady-state vibration section of a response curve is subjected to Fouriertransform to obtain a frequency domain response of the floating raft structure, namely, the broadband line spectrum vibration response; and by comparing the line spectrum vibration response with a design standard, quick fore