67results about How to "Reduce low frequency vibration" patented technology

The invention relates to the field of aerial vehicles, and in particular relates to a shock-absorbing device and an unmanned aerial vehicle. The shock-absorbing device comprises a first connecting piece, at least one second connecting piece and at least one shock-absorbing part, wherein each second connecting piece is connected with the first connecting piece through the at least one shock-absorbing part; each shock-absorbing part comprises a shock-absorbing part body and at least one throttling valve; each shock-absorbing part body comprises a flexible cavity provided with at least one opening; each throttling valve is correspondingly arranged at one opening of each flexible cavity and is provided with at least one throttling hole for communicating the inner part of each flexible cavity with an external environment. The shock-absorbing parts in the shock-absorbing device can be used for simultaneously isolating low-frequency vibration and high-frequency vibration, so two shock-absorbing parts for respectively isolating the low-frequency vibration and the high-frequency vibration are not needed to be arranged in the shock-absorbing device, and further the use amount of the shock-absorbing parts in the shock-absorbing device is reduced; the high-frequency vibration and the low-frequency vibration are simultaneously isolated under the condition that the shock-absorbing device is enabled to be smaller in size.

A tuning-fork type crystal vibrating piece (20) is comprised of a base portion (23) comprising a piezoelectric material, a pair of parallel vibrating arms (21) with a designated thickness (D3) and width (W3) extend from the base portion, and a pair of weight portions (28) are formed by enlarging the width (W4) of the distal ends pair of vibrating arms. A cross-section of the pair of weight portions is formed symmetric with a central axis which is center of the pair of vibrating arms, and at least one portion of the pair of weight portions has a thickness which is less than the designated thickness (D3).

A plurality of non-magnetic dampers on a voice coil yoke arm for reducing low frequency vibration in a hard disk drive is disclosed. One embodiment provides housing and at least one disk coupled with the housing. In addition, an actuator is coupled to the housing, the actuator having a coil region with a voice coil and a plurality of voice coil yoke arms. At least one of a plurality of non-magnetic dampers is also coupled with each of the plurality of voice coil yoke arms and not with the voice coil. In so doing, the plurality of non-magnetic dampers are able to damp low frequency actuator coil torsion and coil bending resonances.

A lightweight passive attenuator (1) for spacecraft includes two omega cross-section rings (2), placed symmetrically and defining a gap therebetween, and being the main load path of the light passive attenuator (1). A plurality of damper elements (3) are placed in the gap defined between the two omega cross-section rings (2), and not in the main load path of the light passive attenuator (1), such that the omega cross-section rings (2) and the damper elements (3) are assembled at their ends by attachment elements. The omega cross-section rings (2) have a protruding central part (5) with a plurality of holes (6) for connection with adjacent structures (7, 8) of the spacecraft.

A structure of a motor-mount for an electric vehicle that supports a lower part of a motor of an electric vehicle includes a core into which a bolt fastened to the motor is inserted in a center, a stopper that is coupled to surround an outer circumferential surface of the core, and is made of rubber, an insulator that is connected to a lower end of the stopper, is coupled to a lower part of the core, and has a concave lower surface, and a housing into which the core, the stopper and the insulator are forcibly inserted, where the housing has a cylindrical shape in which a bottom is opened, and an outer circumferential surface of the stopper comes in contact with an inner circumferential surface of the housing.

A Stirling engine assembly for a DCHP system. A Stirling engine (1) is suspended from a mounting frame (5) by a plurality of tension springs (6). An annular absorber mass (2) surrounds the Stirling engine and is suspended from the engine on a plurality of resilient members (3) arranged asymmetrically about the main axis. The asymmetric arrangement is provided by members of different stiffnesses, or irregular spacing of the members. The absorber mass (2) itself may be reduced adjacent to the resilient members.

A turbocharger includes a housing and a rotary assembly disposed within the housing and including a turbine wheel and a compressor wheel attached to one another by a shaft. A bearing is disposed in the housing and rotatably supports the shaft. The bearing includes a pair of inner bearing surfaces that engage opposite ends of the shaft and a pair of outer bearing surfaces that engage the housing. The pair of inner bearing surfaces have a first axial dimension and the pair of outer bearing surfaces have a second axial dimension that is smaller than the first axial dimension.