15 results about "Dynamic Vibration Absorber" patented technology

The present application relates to the technical field of mechanical vibration and damping and noise reduction, and particularly relates to a three-dimensional dynamic vibration absorber based on a parallel mechanism, which comprises a fixed frame, a vibration-absorbing mass, and three identical branch kinematic chains; the fixed frame comprises a lower bottom plate, an upper top plate, and a guide rod; the guide rod is installed between the lower bottom plate and the upper top plate; the branch kinematic chain is sleeved on the guide rod; the vibration-absorbing mass is installed between the lower bottom plate and the upper top plate; and the branch kinematic chain is connected with the vibration-absorbing mass through a spherical hinge. The present application can effectively suppress multi-dimensional line spectrum vibration of a dynamic mechanical device and overcome the problems of large size and large additional mass of existing multi-dimensional dynamic vibration absorbers.

The application discloses a design method of a modulus power-law acoustic black hole dynamic vibration absorber, and designs an acoustic black hole structure with the modulus of elasticity of material changing in a power-law along the length direction of the structure as a dynamic vibration absorber device based on the acoustic black hole principle. Compared with the traditional acoustic black hole dynamic vibration absorber with the same mass and the same length and width and the geometric thickness changing in a power-law, the acoustic black hole dynamic vibration absorber with the modulus of elasticity changing in a power-law can not only effectively reduce the threshold frequency of damping enhancement, but also effectively improve the structural modal loss factor, so as to realize excellent low-frequency super-wideband damping enhancement and dynamic vibration absorption effect.

The application discloses a disc-shaped double helical wave manipulation dynamic vibration absorbing structure and belongs to the technical field of equipment vibration reduction. The disc-shaped double helical wave manipulation dynamic vibration absorbing structure is designed in a variable thickness mode. The propagation speed of elastic waves gradually decreases with the decrease of the thickness. The vibration amplitude is concentrated at the position where the thickness of the variable thickness region of the disc-shaped double helical wave manipulation dynamic vibration absorbing structure is the thinnest. A small amount of viscoelastic damping material is combined at the edge position, so that the vibration energy is dissipated as heat energy, thereby achieving the purpose of vibration reduction. In addition, due to the disc-shaped double helical wave manipulation dynamic vibration absorbing structure, the full-band resonance peak of the controlled structure is efficiently suppressed, and the weight of the vibration reduction structure is reduced, and the installation space of the structure is compressed. The dynamic vibration absorbing effect and the overall loss factor of the structure are increased by improving the modal density and the loss factor density, so as to provide a novel vibration reduction structure for efficiently reducing the vibration of the covering structure in the full-band high, medium and low frequency range.

The application relates to a power electronic device with a dynamic vibration absorption function, an electric drive system and a vehicle. The power electronic device comprises a power electronic box and a vibration absorption device. The electric drive system comprises a hub motor assembly, the power electronic device and a suspension. The suspension comprises a suspension shock absorber assembly, an upper control arm and a lower control arm. The suspension shock absorber assembly is connected to a vehicle body and the lower control arm. A wheel of the hub motor assembly is connected to a hub motor. The upper control arm is connected to an upper connecting frame and the vehicle body. The lower control arm is connected to a lower connecting frame and the vehicle body. The power electronic box is installed on the upper connecting frame. Compared with the prior art, the power electronic device uses its own weight as a vibration absorber to work. The vertical negative effect of the vehicle caused by excessive unsprung mass is improved without increasing the weight of the whole vehicle. The working direction of the power electronic device as a dynamic vibration absorber is fixed, and only the vertical bump is inhibited, and the power electronic device does not affect the wheel movement in other directions.

To provide a technique of supporting design of a dynamic vibration absorber suitable to a processing tool.SOLUTION: A reception unit 112 receives a resonant frequency of a processing tool. A holding unit 120 holds a relation between a spring constant and a crush amount of an elastic body. An information acquisition unit 114 refers to the holding content of the holding unit 120 and acquires at least one of information about the crush amount of the elastic body in a dynamic vibration absorber having a resonant frequency matching or approximate to the received resonant frequency of the processing tool, information about the size of the elastic body, information about the number of elastic bodies and information about the mass of a mass body. An output unit 116 outputs the acquired information to an output device 130.SELECTED DRAWING: Figure 18

This technology offers advantages for quickly modifying the characteristics of dynamic absorbers. [Solution] The dynamic vibration absorber comprises a first member including an electromagnet, a second member coupled to an object to be damped, an elastic body connecting the first member and the second member, and a magnetic body arranged to be attracted by the electromagnet.

The application discloses a forklift steering wheel vibration suppression structure and a design method thereof, and belongs to the field of internal combustion forklift vibration control. The method comprises the following steps: establishing a five-degree-of-freedom coupled dynamics model containing a vehicle frame, a roof frame, a steering wheel and a nonlinear dynamic vibration absorber; constructing an objective function with the minimization of the steering wheel vibration response as the target; iteratively optimizing the linear and nonlinear stiffness and damping parameters of the vibration absorber by using a particle swarm algorithm; and determining the vibration absorber structure composed of a mass block and multiple steel wire rope isolators according to the optimal parameters. The suppression structure comprises the roof frame and a nonlinear dynamic vibration absorber designed by the optimization method and installed on the top of the roof frame. Through target-oriented reverse design, the vibration absorber can efficiently suppress the wideband vibration of the distal steering wheel, and has the advantages of remarkable control effect, wide frequency band, simple and reliable structure and strong environmental adaptability.

The application discloses a power vibration absorber capable of inhibiting frame vibration, which comprises a shell, a mass block, a first elastic element and a second elastic element, the shell is a frame type cage structure, the shell comprises a fixed frame, a movable plate and a mounting plate, the mass block is arranged in the shell and is not connected with the shell, the first elastic element and the second elastic element are arranged on the left side and the right side of the mass block respectively, and the ends, away from the mass block, of the first elastic element and the second elastic element are connected with the shell. The mass block of the application can vibrate in multiple directions instead of only vibrating in one direction, so that the application can absorb vibration in multiple directions, and the vibration absorption effect of the application is effectively improved.

An actuator for head-up display including a link coupled with one end of an aspherical mirror, a driving force transmission including a lead screw to move the link, a driver to rotate the lead screw in a direction of a rotation axis of a motor according to driving of the motor a lead screw bracket coupled to the driver and supporting the driver, and a cantilever-type dynamic vibration absorber configured to connect the driver to the lead screw bracket and absorb vibration and shock in three axes.

This invention discloses a design and fabrication method for an acoustic black hole dynamic vibration absorber with power-law variations in density and Young's modulus of two materials. Based on the acoustic black hole effect, this method constructs an acoustic black hole structure with power-law variations in dual-material parameters and a corresponding dynamic vibration absorption device by synergistically controlling the spatial power-law distribution of material density and Young's modulus. Compared to traditional acoustic black hole dynamic vibration absorbers with power-law variations in geometric thickness and the same mass, length, and width, the dual-material power-law structure can effectively reduce the threshold frequency for damping enhancement, achieving excellent low-frequency broadband damping enhancement and dynamic vibration absorption effects.

This invention relates to a low-vibration exciter fixing device and its usage method for anechoic tank testing, belonging to the field of ship vibration and noise testing technology. This invention solves the problems of traditional anechoic tank vibration and noise testing, which cannot flexibly excite underwater structures and suffer from significant vibration transmission effects from the exciter itself. The main support is suspended below a crane hook by several first ropes, and the test model is suspended below the main support by several second ropes. A movable support frame straddles the main support. The exciter's horizontal position is adjusted by adjusting the position of the first bolt on the main support, and its position is adjusted along the depth of the anechoic tank by a first position adjustment hole on the fixed support. An angle plate is parallel to the movable support frame, and a vibration damping structure and a dynamic vibration absorber are installed on the fixed support. By preventing vibration transmission and absorbing vibration energy, the structural vibration response caused by the exciter's operation is reduced.

This application discloses a dynamic vibration absorber, including a housing for connection and fixation. The housing includes a base and an outer cover, with the outer cover fitting onto the base to form an installation area within the housing. The installation area is equipped with a vibration-absorbing component, which includes an elastic element. The dynamic vibration absorber also includes a stiffness adjustment component linked to the vibration-absorbing component. The stiffness adjustment component includes a drive component and a rotating component pulsatingly connected to the drive component. The rotating component abuts against the elastic element, and the drive component drives the rotating component to rotate, providing radial pressure to the elastic element. When the drive component drives the rotating component to rotate, the rubber block abutting against the rotating component experiences radial pressure from the rotating component, changing its compression. Different rotation angles of the rotating component result in different degrees of radial pressure on the elastic element, thus changing the compression of the elastic element and altering the operating frequency of the vibration-absorbing component, enabling the vibration absorber to adjust its operating frequency under different working conditions.

This invention discloses a collision-damped dynamic vibration absorber and parameter optimization method for a cyclically symmetrical structure. The method involves distributing collision-damped dynamic vibration absorber units circumferentially along the cyclically symmetrical structure. Each absorber unit is a single-sided collision structure composed of a dynamic vibration absorber block and a back collision plate. The dynamic vibration absorber block consists of an elastic beam and a collision mass block fixedly connected to the front end of the elastic beam. The back collision plate is located on one side of the collision mass block in a predetermined collision direction. A limiting block is installed at the front end of the back plate, creating an adjustable collision pair between the limiting block and the collision mass block. When the collision mass block and the limiting block do not collide, the collision mass block vibrates freely, and the dynamic vibration absorber block operates in a tuned vibration absorption state. When a single-sided collision occurs between the collision mass block and the limiting block, collision damping is generated, thereby consuming the vibration energy of the cyclically symmetrical structure and suppressing the target modal vibration of the cyclically symmetrical structure.