Beijing Baidu Netcom Science and Technology Co., Ltd.

Beijing Institute of Control Engineering

Jiyang Zhang

Hong Wang

Xin Li

Qiang Zhang

Lei Zhao

Miao Zhang

Gang Zhou

Tao Qin

Xiaowei Wang

Guang Yao

Shuyan Wang

Gongwei Wu

Limei Tian

Heyi Tang

Ruizhi Luo

Tao Qing

Jintao Wu

Yahong Fan

Baichen Zhai

An ultrasonic motor-based regulated variable-damping vibration isolator, includes a base, a magnetorheological damper, and an adapter plate. The magnetorheological damper is mainly used to support and deplete the energy of vibration; the magnetorheological damper includes an upper cavity, a lower cavity, a connecting ring, a permanent magnet, orifices, a magnetic permeable ring, an ultrasonic motor and the like; a magnetorheological fluid is stored in the upper and lower cavities defined by bellows. The magnetorheological damper uses the ultrasonic motor to drive the permanent magnet to rotate to adjust the overlap ratio of the permanent magnet and the orifices, that is, to adjust the number of the orifices entering the magnetic field of the permanent magnet, so as to change the damping intensity of the damper. After rotating in place, the ultrasonic motor can be powered off and self-locked.

Ultrasonic motor-based regulated magnetorheological vibration isolator

Disclosed are a method and an apparatus for setting an access privilege. The method includes: acquiring Internet Protocol (IP) addresses having a access frequency to a target application greater than or equal to a frequency threshold, selecting IP addresses accessing more than one applications per time unit from the IP addresses as to-be-processed IP addresses to generate a to-be-processed IP address set; acquiring access information, related to an access of a target application, of the to-be-processed IP address; acquiring a plurality of target IP addresses in the to-be-processed IP address set based on the access information, determining a probability of access through a gateway by a terminal pointed by each target IP address; and selecting a preset proportion or a preset number of target IP addresses from the plurality of target IP addresses in a descending order of the probability to set the access privilege.

Method and apparatus for setting access privilege, server and storage medium

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Beijing, China

Jiyang Zhang