31results about How to "Reduce abnormal vibration" patented technology

An experimental method for measuring critical speed influencing factor for a steam turbine rotor relates to an experimental apparatus and method for measuring critical speed related influencing factors for a steam turbine rotor. A first sliding bearing (2), a second sliding bearing (3), a drive motor (4), a displacement sensor support (7) and a speed sensor support (10) are mounted on a carriage (1), a steam turbine rotor simulation spindle (5) and a steam turbine rotor simulation wheel (6) are mounted on the above-mentioned two bearings, a displacement sensor (8) and a speed sensor (11) are fixed on a support, a measurement signal is processed in a vibration data analyzer (13) and input to a computer and test software (14), and a speed regulator (12) controls output speed of the drive motor (4) through a connecting wire (15). It is possible to measure changes in the critical speed of the rotor by changing structural rigidity and quality of the steam turbine simulation rotor, thus acquiring main factors that influence the critical speed of the steam turbine rotor and their effect.

The invention provides a transmission system torsional vibration reducing method and application thereof. The method is characterized in that a torsional vibration damper, which is a tuned rotary inertia damper, is added on a transmission shaft in a parallel connection manner, and the torsional rotation movement around the transmission shaft is used for reducing the vibration level of a certain first order torsional mode frequency. The method is flexible, can effectively reduce vibration without damage to the original structure of the transmission system, and can be used for later repair of the transmission system. The method can be applied to wind energy/tidal current energy generator sets; the torsional vibration damper is installed on a shaft, connected with a generator, of a high speed shaft coupler to greatly reduce a first-order mode component in the torsional vibration, so that a transmission system can operate more stably, the reliability of the structure can be improved and the service life can be prolonged.

A unit for preventing reverse rotation of vortex compressor, which has a rotary shaft with moving vortex disk, the compression unit composed of moving and static vortex disks, power generating unit, lubricating unit and reverse rotation preventer, features that it is arranged on main frame and moving vortex disk. When said moving vortex is going to rotate reverse, an elastic limiting pin moves upward and is hooked by a slot only main frame, so preventing the reverse rotation of moving vortex disk.

This ultrasonically-actuated unit is provided with: an ultrasonic wave transmission unit that is provided along the lengthwise axis and transmits ultrasonic vibrations; a relay unit that, at a node position of longitudinal vibrations, is contiguous with the ultrasonic wave transmission unit or is connected to the ultrasonic wave transmission unit; and a non-contact vibration unit that can transmit improper vibrations, is provided along a direction parallel to the lengthwise axis in the state of not contacting the ultrasonic wave transmission unit, and to which improper vibrations are transmitted from the ultrasonic wave transmission unit via the relay unit. The ultrasonically-actuated unit is provided with a vibration absorbing unit that absorbs the improper vibrations transmitted to the non-contact vibration section.

The invention discloses a bogie. The bogie comprises a framework, a traction device, a primary suspension device and a secondary suspension device. The traction device comprises a first traction rod used for being hinged to the framework, a triangular supporting rod used for being connected with a framework front-end beam and a second traction rod used for being hinged to an adjacent vehicle body. The first traction rod and the second traction rod are located in the same vertical plane and both hinged to the triangular supporting rod. The first traction rod is horizontally arranged, and the end, used for being connected with the vehicle body, of the second traction rod is higher than the end, connected with the triangular supporting rod, of the second traction rod. According to the device, the combination of the double traction rods and the triangular supporting rod which are low in rate of wheel load reduction and high in adhesion utilization rate is adopted, so that a low-position traction structure is formed, and thus the vehicle body is connected with the bogie. Braking force and traction force are transmitted, and the overall adhesive property is good. Moreover, the stability of the vehicle body in the turning process can be improved. The invention further discloses transportation equipment including the bogie. Abnormal vibration is reduced, and safety and comfort are improved.

The embodiment of the invention discloses a control signal synchronization method, device and system, a vehicle and a storage medium. The method comprises: the main control unit generating a synchronous clock signal according to a first carrier signal; the slave control unit receiving the synchronous clock signal and calculating the phase difference between the synchronous clock signal and a second carrier signal; the slave control unit adjusting and controlling phase synchronization of the second carrier signal and the first carrier signal through a phase-locked loop PLL according to the phase difference; the master control unit generating a first pulse width modulation (PWM) signal according to the first carrier signal and the command signal, and the slave control unit generating a second PWM signal according to the second carrier signal and the command signal. According to the technical scheme provided by the embodiment of the invention, synchronization of the PWM signals can be realized, so that abnormal vibration generated in a vehicle driving process is reduced.

The invention provides an impeller and an axial flow fan with the impeller capable of obtaining high reliability with less occurrence of abnormal vibration. The impeller comprises blades (4) which are radially provided on the outer peripheral surface of a cup-shaped boss member(5) and an aluminum plate (9) which is partially arranged on the surface of the blade (4).

A damper for automobile transmission shafts comprises a damping body and an inner ring in the damping body; and the inner ring is provided with cavities in which rubber is filled. The damper ensures that the rubber is firmly integrated with the inner ring, so that the inner ring is prevented from being separated from the rubber layer due to the failure of adhesive or the unreliable adhesion of the rubber layer, and thereby the damper can effectively reduce the abnormal vibration of an automobile transmission shaft. The structure of the damper is simple and compact, integrated and standardized design and production are convenient, and the mounting space can be reduced. When the damper is produced, in the process of vulcanization, adhesive does not need to be applied, sand blasting is not needed, consequently, the production process is simplified, and the production efficiency is increased; meanwhile, since adhesive does not need to be used, the health of operators is prevented from being harmed, and environment pollution is prevented as well.

The invention provides an electric compressor which can effectively reduce vibration of a suction tube. The electric compressor is provided with a compressing mechanism part (6) for compressing a refrigerant, an electric mechanism part (5) for driving the compressing mechanism part, an enclosed container (7) where the compressing mechanism part and the electric mechanism part are arranged, a liquid storage device (1) for temporarily storing the refrigerant, a suction tube (4) which supplies the refrigerant from the to a suction inlet (8) of the compressing mechanism part arranged in the enclosed container, and a support part (2) which supports the suction tube in the liquid storage device. A straight part of the suction tube is arranged in the liquid storage device in a manner of extendingin the up-down direction. With respect to the overall length L of the straight part of the suction tube, the support part is arranged on the position away from the connecting side end (4Pa) of the enclosed container and the suction tube for more than L/4 and less than 3L/4.