Aiming at a kind of middle ear implant（MEI）, the driving voltage of a piezoelectric floating mass actuator is analyzed using a 0. 7Pb （Mg1/3Nb2/3） O3-0. 3PbTiO3 （ PMN- 30% PT）stack as a new type of vibrator. For...Aiming at a kind of middle ear implant（MEI）, the driving voltage of a piezoelectric floating mass actuator is analyzed using a 0. 7Pb （Mg1/3Nb2/3） O3-0. 3PbTiO3 （ PMN- 30% PT）stack as a new type of vibrator. For the purpose of facilitating the analysis, a simplified coupling model of the ossicular chain and the piezoelectric actuator is constructed. First, a finite element model of a human middle ear is constructed by reverse engineering technology, and the validity of this model is confirmed by comparing the simulated motion of the stapes footplate obtained by this model with experimental measurements. Then the displacement impedance of the incus long process is analyzed, and a single mass-spring-damper equivalent model of the ossicular chain attached with the clamp is derived. Finally, a simplified coupling model of the ossicular chain and the piezoelectric actuator is established and used to analyze the driving voltage property of the actuator. The results show that the required driving voltage decreases with the increase in the frequency, and the maximum required driving voltage is 20. 9 V in the voice frequencies. However, in the mid-high frequencies where most sensorineural hearing loss occurs, the maximum required driving voltage is 3.8 V, which meets the low-voltage and low-power requirements of the MEI.展开更多
12)布袋装,内衬聚乙烯袋,每袋净重廿五公斤。 In cloth bags of 25 kgs. neteach, with polythene bags as innerpacking. 3.桶、盆(Drums、Basins, etc、) 1)铁桶装,每桶净重100公斤。 In iron drums of 100 kgs. neteach. 2)五十三加...12)布袋装,内衬聚乙烯袋,每袋净重廿五公斤。 In cloth bags of 25 kgs. neteach, with polythene bags as innerpacking. 3.桶、盆(Drums、Basins, etc、) 1)铁桶装,每桶净重100公斤。 In iron drums of 100 kgs. neteach. 2)五十三加仑内涂锡铁桶装,每桶净重170/175公斤。 In 53-gallon iron drums insidecoated with tin, net weight 170-175kgs. each. 3)坚固铁桶装,每桶约净重400磅。展开更多
基金The National Natural Science Foundation of China(No10772121)the Med-Science Cross Research Foundation of Shanghai Jiao-tong University (NoYG2007MS14)
文摘Aiming at a kind of middle ear implant（MEI）, the driving voltage of a piezoelectric floating mass actuator is analyzed using a 0. 7Pb （Mg1/3Nb2/3） O3-0. 3PbTiO3 （ PMN- 30% PT）stack as a new type of vibrator. For the purpose of facilitating the analysis, a simplified coupling model of the ossicular chain and the piezoelectric actuator is constructed. First, a finite element model of a human middle ear is constructed by reverse engineering technology, and the validity of this model is confirmed by comparing the simulated motion of the stapes footplate obtained by this model with experimental measurements. Then the displacement impedance of the incus long process is analyzed, and a single mass-spring-damper equivalent model of the ossicular chain attached with the clamp is derived. Finally, a simplified coupling model of the ossicular chain and the piezoelectric actuator is established and used to analyze the driving voltage property of the actuator. The results show that the required driving voltage decreases with the increase in the frequency, and the maximum required driving voltage is 20. 9 V in the voice frequencies. However, in the mid-high frequencies where most sensorineural hearing loss occurs, the maximum required driving voltage is 3.8 V, which meets the low-voltage and low-power requirements of the MEI.
文摘12)布袋装,内衬聚乙烯袋,每袋净重廿五公斤。 In cloth bags of 25 kgs. neteach, with polythene bags as innerpacking. 3.桶、盆(Drums、Basins, etc、) 1)铁桶装,每桶净重100公斤。 In iron drums of 100 kgs. neteach. 2)五十三加仑内涂锡铁桶装,每桶净重170/175公斤。 In 53-gallon iron drums insidecoated with tin, net weight 170-175kgs. each. 3)坚固铁桶装,每桶约净重400磅。
