부산대학교 도서관

We introduced the basic principle of Variational Mode Decomposition (VMD). The reliability and feasibility of VMD in the frequency analysis and decomposition of sluice vibration signals are studied by means of a simulation signal consisting of quadratic trend term, chirped signal and segmented cosine. Through the application of VMD to the actual work of sluice vibration detection, it is confirmed that the method can eliminate the noise signal of sluice vibration, and can better reflect the real vibration of sluice in the state of water flow. We decomposed and reconstructed the Qiaogong sluice vibration acceleration signal by VMD, get the root mean square value of the vibration displacement is $98.8\ \mu\mathrm{m}$. The displacement belongs to the hazard degree of tiny vibration. The vibration also conforms to the combined effect of amplitude and frequency, it is harmless to the sluice.