Study On The Technique Of The Diesel Active Vibration Isolation Base On The Adaptive Lattice Algorithm

Active vibration isolation technique has good vibration isolation effect in the low frequency range, it can be used as an effective supplement for the passive vibration isolation, and then satisfactory control performance can be derived in a more wide frequency region. In this thesis, aiming at the nonlinear problem existing in the two stage experimental setup of hydraulic pressure pattern for active isolation control, the adaptive notch and lattice filter algorithm are employed to conduct the experimental studies, respectively.First, adaptive notch algorithm is employed to conduct the experimental study, and it is shown from the results that this strategy has better control effect for the basic frequency of the diesel engine, vibration attenuation can be 8～20dB, however, nonlinear aberrance exists in the control results. In order to solve this problem, to get more appropriate control algorithm, detailed research on adaptive lattice filter algorithm is carried out in this thesis. An adaptive lattice filter algorithm suitable for active isolation control is established, simulation study on this algorithm is also given, and then the validity of this algorithm is verified. Finally, in the light of the good simulation results, experimental study on active isolation control of diesel engine isolation set is performed, it is demonstrated that the adaptive lattice filter algorithm has obvious control effect for the active isolation control, vibration attenuation can achieved 6dB, and nonlinear characteristic does not have great affect on it. According to this, implication of the adaptive lattice filter algorithm to the active isolation control system of diesel engine is effective, and it also has obvious effects for treatment of nonlinear problem produced by the hydraulic pressure actuator.