Du Fei

Experimental study on the friction and wear performance of new dual friction materials

Three types of palygorskites and three types of NBR-modified phenolic resin are compressed respectively into new dual friction materials by material testing machine. Their friction, wear and impact resistance performances are studied experimentally. The results show that modified friction materials have better performance than unmodified phenolic resin materials. But compared with NBR-modified phenolic resin, the friction and wearing performances of dual friction material compressed by palygorskites by Al-Zr coupling agent and modified phenolic resin by Al2O3 nanoparticles decrease a little bit and the mixed modified material by XD-172 has better effect only in low temperature stage.

Multimode vibration supression of piezoelectric plate based on minimal control synthesis algorithm

In order to suppress the vibration of piezoelectric plate effectively, the minimal control synthesis (MCS) algorithm based on Popovs criterion method is used to suppress vibration of a simple plate. The state equations of piezoelectric plate first-order and second-order mode are set up by experiment. The reference model is determined by LQR method. Simulation results show that the method have faster convergence, good robustness performance and strong anti-interference ability whether transient disturbances excitation or persistent disturbances excitation.