584 results about "Dynamic Vibration Absorber" patented technology

The invention discloses a hydraulic multifrequency dynamic vibration absorber for a rotary mechanical rotor applicable to vibration control of multifrequency components of industrial rotary mechanical rotor systems of fans, compressors, turbines and machine tool spindle systems and the like, and belongs to the technical field of the vibration control. The hydraulic multifrequency dynamic vibration absorber comprises a connecting and transmitting mechanism, an adjustable tuning mass mechanism and a control system. The adjustable tuning quality mechanism comprises spring sets and mass blocks, the mass blocks are annual and hollow sealed cavities filled with water, oil or other high-density liquid medium and are connected with pumps and a recycling-liquid tank through a pipeline system, and mass of mass cavities is changed through liquid pumping and spraying of the pumps and frequency regulating is realized. The hydraulic multifrequency dynamic vibration absorber for the rotary mechanical rotor has the advantages of high reliability, stable performance, absence of worn parts, flexibility in adjustment, and thereby being applicable to the vibration of the multifrequency components and the like.

Disclosed herein is a smart vibration absorber for traffic signal supports. In exemplary embodiments, the vibration absorber utilizes the mass of the signal head as a damped vibration absorber. The system may also include a spring and damper in mechanical communication with the signal head. The spring provides resistance to the compression force of the signal head while the damper provides a damping force removing energy from the system. Also disclosed herein is a controllable damper which may be connected to a computing device for varying the damping of the system. The controllable damper may be a magneto-rheological fluid damper. The smart vibration absorber may be constructed as a retrofit for installation on current traffic signals supports.

The invention relates to a rotor variable-mass frequency-modulation dynamic vibration absorber of rotating machinery. The vibration absorber is formed by a connection transmission mechanism, a mass regulating mechanism and a control system. A rotating machinery rotor produces vibration in the work. The rotor variable-mass frequency-modulation dynamic vibration absorber is installed at the proper position of the rotor. The connection transmission mechanism installed on the rotor transmits vibration energy produced by the rotor to the mass regulating mechanism; the mass regulating mechanism keeps consistent in frequency with a rotor main system under the adjustment of the control system to cause resonance; an annular mass plate produces a dynamic response and counteracts the dynamic response on the rotor main system, so that the effects of offsetting and suppressing rotor vibration are achieved. The rotor variable-mass frequency-modulation dynamic vibration absorber is unique in structure, high in reliability, stable in performance, low in maintenance frequency, flexible in installing position and good in adaptability; besides, the control system is excellent, and active control is easy to achieve.

Rolling element bores are provided in the outer circumferential portion of a disk-like main body. Each rolling element bore has an arcuate outer rim. Rollers each have a groove formed on the peripheral edge and extending along the entire circumference of the roller. The outer rim of each rolling element bore engages with the groove of the associated roller so that the roller is loosely fitted in the rolling element bore. Shafts are respectively formed on both sides of each roller. The shafts project from the center of the roller. An elastic ring is mounted on each shaft. Annular guide plates are respectively mounted on both sides of the disk-like main body so that the shafts of the rollers are supported by the guide plates.

A dynamic vibration absorber (1) includes: a weight (2); a frame body (3) which surrounds the weight (2); a total of four pairs of vertically mounted U-shaped leaf springs (4, 5, 6 and 7) which are interposed between the frame body (3) and the weight (2) so as to hold the weight (2) with respect to the frame body (3) movably with respect to all directions in a horizontal plane and immovably in a vertical direction (V); and a damping mechanism 8 for damping the vibration of the weight (2) in the horizontal plane.

The invention discloses a novel pendulum-type eddy current damping tuned mass vibration absorber, comprising a frame connected with a structure to be damped, a rigid suspender having the upper end articulated to the top of the frame, and a permanent magnet arranged at the bottom of the rigid suspender, wherein a mass block is articulated to the body of the rigid suspender above the permanent magnet; a conductor plate for conducting electricity is arranged at the bottom of the frame; the upper surface of the conductor plate is an arc surface, and when the permanent magnet swings to any position, the clearance between the permanent magnet and the conductor plate is not changed. By changing the installation position of the permanent magnet and increasing the damping coefficient via the lever principle, the eddy current damping effect is strengthened. The clearance between the permanent magnet and the conductor plate is constant, so that the damping coefficient is not reduced and the damping effect is not influenced. The vibration absorber is simple in installation and maintenance.

A light scanning apparatus, including: a light source; a rotary polygon mirror configured to deflect a light beam emitted from the light source; a plurality of optical members configured to guide the light beam, which is deflected by the rotary polygon mirror, to a photosensitive member; a drive motor configured to rotate the rotary polygon mirror; an optical box to which the light source is attached, the optical box containing the rotary polygon mirror, the drive motor, and the optical members; and a dynamic vibration absorber mounted inside the optical box and configured to be vibrated by vibrations of the optical box, wherein the plurality of optical members are supported on a bottom portion of the optical box, and the dynamic vibration absorber is disposed on the bottom portion of the optical box at a position between at least two adjacent optical members among the plurality of optical members.

The invention relates to a dynamic vibration absorber capable of reducing vibration levels of pipelines and a method for designing the dynamic vibration absorber, and belongs to the technical field of vibration absorption. The dynamic vibration absorber comprises a first pair of pipeline clamps (1); the pipeline clamps (1) are connected with each other by first bolts (2) and first nuts (3); N spring strips (4) are uniformly mounted on the outsides of the pair of pipeline clamps (1); additional mass blocks (7) are mounted at the tail ends of the spring strips (4); the N ranges from 3 to 6. The dynamic vibration absorber and the method have the advantages that the dynamic vibration absorber is simple in structure, easy to install and high in reliability, and vibration of various pipeline systems can be effectively reduced.

The invention provides a suspension cushion assembly of a powertrain system of automobiles, which comprises a metallic framework, a rubber bushing, a mandrel and a dynamic vibration absorber, wherein a projecting shaft of the mandrel is inserted into the inner bushing of the rubber bushing, and is in interference fit with the inner wall of the inner bushing, at least two bolt holes which are connected with a support of the powertrain are distributed on the mandrel, and the mandrel is provided with the dynamic vibration absorber. By optimizing the structure of the mandrel of the suspension cushion, integrating the dynamic vibration absorber on the mandrel, and adding an L-shaped metal brace on the upper part of the metallic framework, the invention can improve the dynamic stiffness of the suspension cushion assembly, realize that the range of the working speed of rotation of an engine including the starting and idling of an engine can effectively cut off the transmission of the engine vibration to automobile body, and improve the NVH performance and the riding comfortableness of the whole automobile.

The invention discloses a variable mass dynamic vibration absorber control method. A sensor used for collecting main system input and output vibration signals is arranged on a compound system composed of a main system-variable mass dynamic vibration absorber, and when the minimum inherent frequency omega m and the maximum inherent frequency omega n of the variable mass dynamic vibration absorber are used respectively, an amplitude-frequency response curve of a main system in the frequency range (0,omega t] is formed; as for the variable mass dynamic vibration absorber control method, while the main system works, the main system vibration signals are collected through the vibration sensor, and excitation frequency omega exerted by the external world is calculated through fast Fourier transform; the variable mass dynamic vibration absorber is controlled according to the value of the excitation frequency omega. According to the variable mass dynamic vibration absorber control method, the effective vibration reduction frequency band of the vibration absorber can be effectively broadened, the phenomenon of resonance of the main system after the vibration absorber is installed can be eliminated, and performance of the vibration absorber is more stable. No control system or actuator needs to be additionally arranged, and the variable mass dynamic vibration absorber control method is easy to achieve and has good practical value.

A washing machine having a device for directly reducing vibration of an external structure serving as a direct factor for causing a user to feel vibration. The washing machine includes an external structure forming an external casing; a washing tub installed in the external structure; a driving device for driving the washing tub; a support device for supporting the washing tub; and dynamic vibration absorbers for directly reducing vibration transmitted to the external structure.

The invention provides an intelligent self-adaptive vibration absorber. The intelligent self-adaptive vibration absorber comprises a driving body, a mass body, an elastic beam, a terminal limiting sensor and a piezoelectric sensor device, wherein the driving body is arranged at one end of the elastic beam; the mass body is movably arranged on the elastic beam, and moves in a reciprocating way along the elastic beam under the driving force of the driving body; the terminal limiting sensor and the piezoelectric sensor device are arranged on the end part of the other end of the elastic beam; self-adaptive control of the inherent frequency of the vibration absorber is realized through adjustment of the length of a cantilever beam formed on the elastic beam by the mass body. Meanwhile, the invention provides an array integrating device based on the intelligent self-adaptive vibration absorber and application of the intelligent self-adaptive vibration absorber. The intelligent self-adaptive vibration absorber is simple in structure, and is suitable for multi-field popularization; precision suppression of single vibration of a controlled object can be realized, precision suppression control can be performed on multi-frequency laminated vibration of the controlled object, and inertial driving and power generation application are realized through structural specificity.

The purpose of the invention is to provide a passive/active-selectable cantilever type dynamic vibration absorber, which comprises an overall base, a step motor, a gear shaft, baffles and a mass block, a driven gear is fixed on the gear shaft, a front bearing base, a rear bearing base and the step motor are fixed on the overall base, a front bearing and a rear bearing are respectively mounted on the front bearing base and the rear bearing base, the gear shaft passes through the front bearing base and the rear bearing base and is respectively fitted in the front bearing and the rear bearing, the driven gear is located between the front bearing base and the rear bearing base, the output end of the step motor is connected with a driving gear, the driving gear is engaged with the driven gear, the overall base is fixed between the two baffles, the gear shaft is provided with an external thread, the center of the mass block is provided with a hole, the wall of the hole is provided with an internal thread which is matched with the external thread of the gear shaft, and the mass block is mounted on the external thread of the gear shaft through the internal thread. The passive/active-selectable cantilever type dynamic vibration absorber is structurally simple and highly reliable and can better meet the requirement for vibration absorption under different conditions.

The invention provides a semi-driving type variable stiffness dynamic vibration absorber made from conical springs, belonging to the technical field of vibration control. The semi-driving type variable stiffness dynamic vibration absorber comprises two mass blocks, a high-stiffness plate, two small-stiffness plates, two conical springs, a threaded rod, a stepping motor and a real-time monitoring and controlling system. The weights of the two mass blocks are the same, the two mass blocks are respectively arranged at two ends of the upper surface of the high-stiffness plate with a center hole, one large-diameter ends of the conical springs are respectively fixed at the upper surface and the lower surface of the high-stiffness plate, one small-diameter ends of the conical springs are respectively fixed on the two small-stiffness plates, one small-stiffness plate is fixedly arranged in a main structure, the threaded rod penetrates through the circular hole of the high-stiffness plate, two ends of the threaded rod are respectively in threaded connection with the small-stiffness plates, the directions of screw threads are opposite to one another, the top end of the thread rod is connected with an output end of the stepping motor, and the output end of the stepping motor is electrically connected with the real-time monitoring and controlling system. According to the semi-driving type variable stiffness dynamic vibration absorber, the semi-driving type control is easy to realize, the stiffness can be continuously adjusted, the semi-driving type variable stiffness dynamic vibration absorber is good in vibration absorbing effect, large in vibration absorbing range, quick in response, high in precision, and small in energy consumption.

A dynamic vibration absorber (100) for a washing machine is provided. The dynamic vibration absorber (100) for a washing machine comprises: a mass body; at least one elastic body for supporting the mass body so that the mass body may vibrate; and a guider for limiting a motion of the mass body, wherein the dynamic vibration absorber is attached to the washing machine generating a vibration upon operating to reduce the vibration of the washing machine.

The invention relates to an adaptive linear magnetic liquid damping vibration absorber and belongs to the field of mechanical engineering vibration. A vibration pick-up system of the vibration absorber consists of an inertial mass block and a magnetic reed structure; the rigidity of a magnetic reed can respond to external vibration and can be automatically adjusted; the damping of the vibration absorber consists of electromagnetic damping and viscous damping. A cylindrical permanent magnet adsorbing magnetic fluid serves as the inertial mass block, is positioned in a circular tube, and is subjected to the action of repulsion of magnetic fields of a permanent magnetic sheet and an excitation coil at two ends of the circular tube; the magnetic repulsion resultant force provides restoring force for the inertial mass block, wherein the magnetic repulsion provided by the excitation coil is changeable, and is controlled by collection energy of an induction coil positioned on the outer wall of the circular tube from the external vibration, so the inherent frequency of the magnetic liquid vibration absorber adapts to the external vibration and constantly approaches to the frequency of the external vibration, and the vibration damping performance is improved.

The invention relates to a dynamic vibration absorber capable of improving NVH (Noise, Vibration and Harshness) and a matching method thereof. The dynamic vibration absorber comprises a connecting seat and a plurality of mass blocks; the dynamic vibration absorber further comprises a plate spring, a connecting post, and a fastening piece; one end of the plate spring is fixedly connected to the connecting seat, a sliding chute is further formed in the plate spring in the length direction thereof, the connecting post is detachably connected with the mass blocks, one end of the connecting post is arranged inside the sliding chute in a sliding manner along the sliding chute, and the fastening piece is connected with the connecting post and used for fixedly connecting the mass blocks onto the plate spring. The dynamic vibration absorber provided by the invention can ensure that the natural frequency of the dynamic vibration absorber is adjustable by adjusting the weights and the positions of the mass blocks, aiming at different systems of a whole vehicle, a universal dynamic vibration absorber can be available for damp matching, and an optimal scheme for vibration restraining can be found quickly.

The invention discloses a railway noise controller which is installed on a rail, belonging to noise control field. The noise controller comprises a restraint layer member, a damp layer, a pin roll, a mass block, a retainer pin, a dynamic vibration absorber shell, a wedge-shaped block and an elastic layer. The damp layer is installed at the waist, the flange and the bottom of the rail, and is fixed by the restraint layer member and the dynamic vibration absorber shell. The restraint layer member and the dynamic vibration absorber shell are connected through the pin roll, and the wedge-shaped block exerts clamp force to the restraint layer member and the dynamic vibration absorber shell. The dynamic vibration absorber shell of the mass block is installed at the bottom of the rail and the mass block is connected with the shell through the elastic layer. The railway noise controller effectively reduces noise of the rail in aspect of the noise source. The railway noise controller can be installed on the rail and requires no bond for adhibiting, and is low in cost and convenient to maintain. The restraint layer member, the pin roll, the mass block, the retainer pin, the dynamic vibration absorber shell and the wedge-shaped block can be used repeatedly, and the damp layer and the elastic layer are convenient to replace.

The invention aims at providing a simply supported beam type dynamic vibration absorber with adjustable frequency. The dynamic vibration absorber comprises a base, a stepping motor, two sliding blocks, a transmission screw and a metallic beam, wherein the base is provided with dovetail grooves, the lower end parts of the sliding blocks are of dovetail-shaped structures, support arms with holes are arranged at the upper end parts of the sliding blocks, threaded through holes are formed in the middle parts of the sliding blocks, the lower end parts of the two sliding blocks are mounted in the dovetail grooves, a concentrated mass block is arranged at the middle part of the metallic beam, the two ends of the metallic beam respectively penetrate through the holes of the support arms at the upper end parts of the two sliding blocks, reverse threads are symmetrically formed in the external wall of the transmission screw, the transmission screw penetrates through the through holes in the middle parts of the two sliding blocks and is matched with threads of the two through holes, and a first end of the transmission screw is connected with the stepping motor. According to the dynamic vibration absorber, the defect that the traditional helical-spring vibration absorber is easily affected by mounting pre-tightening force is overcome; compared with the cantilever vibration absorber, the requirements on outward extending space are reduced; compared with the electromagnetic and electric tunable vibration absorbers, the electromagnetic leakage is less.

The invention discloses a six-degree-of-freedom active and passive dynamic vibration-absorbing device, which comprises a bracket and six single degree-of-freedom dynamic vibration absorbers, wherein the six single degree-of-freedom dynamic vibration absorbers are in pairwise symmetrical arrangement, and are fixedly connected with three vertical directions of the bracket via bolts respectively; and the vibration absorbers are connected with a controlled structure in two ways, namely, the vibration absorbers are connected internally and externally with the controlled structure. The bracket is a hollow metal framework connected by six crosses into a cube; each single degree-of-freedom dynamic vibration absorber comprises an end cover, a shell, a coil sleeve, a motor rotor, a diaphragm spring, an M4 nut and an M3 bolt. The six-degree-of-freedom active and passive dynamic vibration-absorbing device is installed on the surface of the controlled structure, has six-degree-of-freedom vibration suppression capability and active and passive control modes, is flexible and easy to control, fast in response speed and good in reliability, and is adapted to the complex vibration suppression working condition with multiple degree-of-freedom. The device has higher practical value and wide application prospect in the technical field of aviation and aerospace.

The invention discloses a positive and negative stiffness parallel-connection low-frequency vibration isolation device of a coupling dynamic vibration absorber. A cam-ball-spring mechanism symmetry arrangement is taken as a negative stiffness mechanism, the negative stiffness mechanism is in parallel connection with a positive stiffness spring to form a quasi-zero stiffness vibration isolator, andon this basis, a dynamic vibration absorber is additionally arranged to form a positive and negative stiffness parallel-connection vibration isolation system of a coupling linear vibration absorber;based on the anti-resonance characteristic in a multi-degree-of-freedom system, the additional dynamic vibration absorber is used for absorbing the vibration energy of a main system, so that the vibration energy is transferred to the dynamic vibration absorber to weaken the vibration intensity of a main structure; when the exciting force frequency is close to the inherent frequency of the dynamicvibration absorber, the power provided by the dynamic vibration absorber to the main system gradually offsets the exciting force acting on the main system, so that the amplitude of the main system canbe reduced sharply; and the vibration absorber with proper quality, stiffness and damping is selected, so that the force transmission rate curve can be moved leftwards, the initial vibration isolation frequency is reduced, the vibration isolation frequency bandwidth is expanded, and the low-frequency vibration isolation performance of the system is improved. The vibration isolation device has high static stiffness and low dynamic stiffness, has wide vibration isolation bandwidth and can be popularized and applied to low-frequency vibration control.