The passive transmission-line cochlear model which estimates Bekesy's data is developed for approximating Rhode's data on mechanical movements of the basilar membrance and the most recent observation by Sellick et al. It is shown that the model with parameter values altered represents Rhode's data well. But it is clear that the adjustment of parameter values for representing data by Sellick et al. is inevitably done. For this purpose, the characteristic impedance of the passive transmission-line model is amended so as to contain the coil. It is shown that the resulting frequency characteristic of the active transmission-line model provides the transfer function if an explicit form. The question of whether the energy is genereted in the circuit is also discussed
In this paper effect of various factors on the Shinkansen super express noise and vibration level(peak levels), that were measured by Nagoya municipal authority in 1976 and 1981, has been studied using multivariate analysis (the quantification theory type I). The results show distance from track, train speed and railroad structure are most affective. Dependences of noise and vibration levels on train speed and distance from track are derived and discussed. Then the results of the analysis are usefully applied to predict the levels especially for noise. Some remarks are also made on difference between the results obtained from the data of 1976 and 1981
Vibration analysis of piezoelectric ceramic resonators which have rectangular shape and two electrode-pairs are made in order to investigate the effect of unelectroded area on the eqivalent electical circuit constants. The finite-element-method applying rectangular elements is used in analyses to deal with the vibration of resonators as two demensional problem and to consider the difference in elastic constants between electroded and unelectoded areas. The principal results obtained for two types of resonators with electrode devided longitudinally and laterally into two are as follows. The resonant frequencies become higher with increase of unelectroded area. In case of the resonator with longitudinally devided electrodes, this effect is almost linear for longitudinal modes and little for flexuial modes. This effect also becomes less as increasing the ratio of width to length. The ratios of capacitance varies up to three figures with unelectroded area and become minimum at certain unelectrode area for several modes