Method of harmonic noise elimination in slip sweep data
LI Zhen-chun · Zhongguo Shiyou Daxue xuebao. Ziran kexue ban · 2012
A new method of eliminating harmonics for slip sweep recording was presented using the pure phase shift filter.The phase spectrum of each harmonic components from the ground force obtained by recording or statistics was computed.Then the procedure of pure phase shift operation was taken and a favorable filter was designed to eliminate the harmonics.The results show that this method is robust,fast and can be easily implemented.Using only the ground force and the start times of the sweeps,it can remove the harmonics in slip sweep data effectively,and it is applicable for real-time processing.