39results about How to "Adjust the natural frequency" patented technology

A damping and anti-vibration supporting device for turning cylindrical parts of a crane, including a base, a slide rail, a sliding seat, a driving mechanism, a support wheel, and a rotation damping mechanism. The bottom surface of the base is in sliding connection with the guide rail of a lathe. There is a slide rail on the surface, the axis of the slide rail is perpendicular to the axis of the lathe guide rail, the slide rail slides with two sliding seats, and the base is equipped with a driving mechanism that can drive the two sliding seats to move toward or away from each other; the top of the two sliding seats A support wheel is provided respectively, and a rotation damping mechanism is respectively provided on the two sliding seats; the rotating damping mechanism includes a housing, a squeeze disc and a gear, and the housing is a box structure with one side open, and the opening surface of the housing is sealed corresponding to the side of the sliding seat. connected, and the side of the open end of the shell is provided with an oil filling port, and the shell is equipped with a squeeze plate, which can seal and slide in the direction of the sliding seat, the gear is located in the shell, and the gear is connected to the axle of the supporting wheel correspondingly, and The device can improve the processing quality of thin-walled cylindrical parts.

A method and an apparatus for semiactive reduction of pressure oscillations in a hydraulic system of a cold or hot rolling mill or strip handling installation for iron, steel or aluminum materials has the following method steps in the stated sequence: a) detection of a pressure signal by a pressure sensor by permanent measurement of a pressure in the hydraulic system; b) determination of an alternating component of the pressure signal; c) determination of at least one manipulated variable, which varies over time, in real time with the aid of a regulator, taking account of the alternating component; d) application of the manipulated variable to at least one actuator, with the actuator changing a natural frequency of an oscillation damper which is connected to the hydraulic system, and thus reducing an amplitude of the pressure oscillations in the hydraulic system.

The invention discloses a fluid film lubrication damping technical test platform, relates to a test instrument in the field of fluid lubrication, and particularly relates to a test platform for researching of fluid film lubrication damping characteristics. The fluid film lubrication damping technical test platform comprises a foundation platform, a vibration exciter support, a test piece support assembly, vibration exciters and an oil drum set. The vibration exciter support and the test piece support assembly are mounted on the upper portion of the foundation platform; the vibration exciters are suspended on the upper portion of the vibration exciter support through bolts; the oil drum set is fixedly mounted on the test piece support assembly. The fluid film lubrication damping technical test platform has advantages of novel structure, convenience in installation and maintenance, high reliability, high automation degree and the like and surely has a positive promotion effect on fundamental research and development of the sliding bearing and aerospace fluid film lubrication damping industry after being marketed.

The invention provides a quasi-zero stiffness vibration isolator based on a magnetic attraction component and a vehicle. The quasi-zero stiffness vibration isolator comprises magnetic spring mechanisms and an air spring; the magnetic spring mechanisms are symmetrically arranged on two sides of the air spring along the axis of the air spring; the magnetic spring mechanisms comprises 3n permanent magnets, and n is a positive integer; the permanent magnets are longitudinally arranged on a guide tube and linearly move along the guide tube, and adjacent permanent magnets are opposite in different stages; the uppermost permanent magnet is connected with one end of the lowermost permanent magnet, the other end of the lowermost permanent magnet is connected with a bottom plate of the air spring; and the middle permanent magnet is connected with an upper end cover plate of the air spring. According to the quasi-zero stiffness vibration isolator, on the premise that the requirement for the quasi-zero rigidity is met, the problems of the large number of parts of the vibration isolator and the large reserved space are solved, and the negative rigidity can be adjusted by adjusting a control coil based on the electromagnetic induction phenomenon.

The invention discloses a novel rocking vibration device, comprising a first rocking vibration body and a second rocking vibration body which are horizontally arranged; the intersection position of acenter line of the left side face of the first rocking vibrating body and a center line of a mirror surface is fixedly connected with a base by means of a first torsion spring; the second rocking vibration body is positioned at the right side position of the first rocking vibrating body; the intersection position of a center line of the right side face of the first rocking vibrating body and the center line of the mirror surface is connected with the intersection position of a center line of the left side face of the second rocking vibrating body and the center line of the mirror surface by means of second torsion springs which are horizontally distributed; the first rocking vibration body is provided with a first reflective lens and a first rotary inertia adjustment balancing weight; thesecond rocking vibration body is provided with second reflective lens and a second rotary inertia adjustment balancing weight. The novel rocking vibration device can effectively adjust the inherent frequency of a rocking vibration body so as to enable the inherent frequency to be consistent with the vibration frequency of a preset target meeting the requirements of exposure equipment or to be within a preset difference value range, thus improving the illumination effect of the exposure equipment.

The invention relates to a frequency-adjustable single-degree-of-freedom pitching motion test system, which includes a support frame, a rotating platform and a rotating bearing; wherein, the support frame includes a first upper frame and a vertical support that are fixedly connected, and the rotating platform includes a fixedly connected The second upper frame and the hanging plate, the middle part of the first upper frame is sleeved on a rotating shaft, the top of the hanging plate is fixed on the rotating shaft and swings with the rotation of the rotating shaft; the first upper frame and the second upper frame are parallel to The two sides of the rotating shaft are connected by symmetrically arranged springs; by changing the number, stiffness and / or mass of the rotating platform, the rotation stiffness, moment of inertia and natural frequency of the rotating platform can be adjusted. The test system of the present invention has a degree of freedom of rotation, and can conveniently and quickly adjust the moment of inertia and natural vibration frequency of the rotating platform to meet the frequency requirements of the test for the structure, and is easy to install and maintain.

A mass shock absorber for a rear axle, relating to a shock absorber, comprising a screw, a mass inertial block, vibration-absorbing rubber, and a mounting bracket. Set on both sides of the vertical plate, each mass inertia block is provided with a central round hole, and the mass inertia block and the vertical plate are connected by vibration-absorbing rubber vulcanization; the screw rod is inserted into a gasket, nut, and buffer rubber sleeve, and the screw rod passes through The central circular hole of the mass inertia block, the vibration-absorbing rubber, the limit hole of the vertical plate, and the buffer rubber sleeve is located in the limit hole of the vertical plate, and the two mass inertia blocks, the two vibration-absorbing rubbers and the vertical plate are connected by gaskets and nuts. The plates are locked together and the amount of lateral compression or tension deflection of the vibration-absorbing rubber can be adjusted. The invention can reduce vibration and noise, can freely adjust the stiffness after rubber vulcanization molding, has good safety performance, can improve the NVH performance of the whole vehicle, shortens the research and development cycle of the vehicle or shock absorber products, and is easy to popularize and apply.

The invention aims to provide a rigidity-adjustable electromagnetic vibration isolator. The structure of a spring steel sheet portion is that an outer layer of spring steel sheets and an inner layer of spring steel sheets are distributed in a bilaterally symmetrical mode and are fixed between an upper fixing plate and a lower fixing plate respectively. Damping materials are filled between the laminated spring steel sheets. The structure of an electromagnet portion is that electromagnetic coils are installed on iron cores, the iron cores are fixed on the upper inner surface and the lower inner surface of an electrician pure iron mounting rack respectively, and the electrician pure iron mounting rack provided with the electromagnetic coils is fixed to the lower fixing plate of the vibration isolator through bolts. The structure of a movable permanent magnet portion is that two adjusting bolts are fixed on the upper fixing plate through nuts respectively, two protruded circular columns are arranged on the center of the upper surface and on the center of the lower surface of a permanent magnet fixing plate, two ring permanent magnets are fixed on the upper surface and the lower surface of a middle plate through the protruded circular columns, and the fixing plate provided with the permanent magnets is connected with the adjusting bolts through the adjusting nuts. According to the rigidity-adjustable electromagnetic vibration isolator, the advantage of good stability of a passive vibration isolator and the advantage of flexible application of an active vibration isolator are integrated.