The drive shaft arrangement has a considerable influence on the vibration responses of the shaft-final drive system. In this research, a coupled vibration model is developed based on force analysis of hypoid gear and lumped mass method. The effect of time-varying mesh stiffness, gear backlash and transfer error are included to investigate the effect of the angle between drive shafts on vibration responses of main reducer. The vibration responses of main reducer are acquired using this model. The results show that the vibration amplitude of the gears of main reducer increase with the angle between drive shafts. This paper presents an analytical method to determine the value of the angle between drive shafts, so as to control the vibration of main reducer.
Abstrucl-The aim of this study is to detect nonlinear dynamic properties in evoked potential (EP) with correlation dimension (CD). We also want to identify if CD could be used as a discriminating statistic of spontaneous EEG and EP. The CD of EEG before and after stimulations are studied. The CD of EP in single trial form and multitrials average form are also studied. Results from this study show that the correlation dimensions of evoked potential is lower than spontaneous EEG. EP signals have less complicated properties than spontaneous EEG.
ECG signals have their own inherent orbit as a nonlinear attractor, but for patients with pacemaker, the pacemaker electrical pulse may disturb this natural inherent process and change the natural normal sinus beat ECG attractor. ECG signals of different leads come from the same ECG attractor, they should have the same dimension, whereas it is not true in our experiment. Using nonlinear dynamics techniques such as correlation dimension (CD) can probe the nonlinear property variation of multi-lead ECG. The CDs of 2 leads every 6 second ECG segments from several recordings of MIT-BIH Arrhythmia Database are calculated, including 4 paced recordings. Results show that CDs of different leads ECG signals have significant difference although they come from the same ECG attractors. The paced ECG signals have less complicated properties than normal sinus ECG.
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