As the piezoelectric stack actuator can withstand pressure only, a preload device is designed to ensure that the intelligent active member can experience tensile stress.
由于压电叠层作动器只能承受压力，为了保证压电智能主动杆能够承受一定的拉力，设计了预压装置。
February 1, 2010 - Parker Hannifin unveiled its Advanced technology Actuator device which utilizes the VIVA Piezoelectric technology.
2010年2月1日-派克公司推出了其先进技术驱动器装置，利用了VIVA压电技术。
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