The invention discloses a low-frequency vibration isolation and piezoelectric energy harvesting coupling device. The device is formed by a quasi-zero-stiffness low-frequency vibration isolator and a piezoelectric energy harvesting device. The quasi-zero-stiffness low-frequency vibration isolator applies a positive and negative stiffness parallel connection principle, and adopts a cam roller negative stiffness structure and a positive stiffness structure which are connected in parallel. The piezoelectric energy harvesting device is formed by coupling a PVDF piezoelectric film and a negative stiffness structure by applying a positive piezoelectric effect. The low-frequency vibration isolation and piezoelectric energy harvesting coupling device can collect and convert vibration energy which is not beneficial in life into available electric energy, and the positive and negative stiffness parallel connection can expand the vibration isolation frequency band, so that the low-frequency vibration isolation and piezoelectric energy harvesting coupling device has good vibration isolation and energy harvesting performance in a low-frequency range. The low-frequency vibration isolator is combined with the piezoelectric energy harvesting device, has double functions of vibration suppression and energy collection, has innovation compared with the prior art, is suitable for vibration isolation and energy harvesting in various situations, and has wide application prospect.

Low-frequency vibration isolation and piezoelectric energy harvesting coupling device

The invention discloses a group adjusting method for quasi zero stiffness vibration isolating devices and a vibration isolating device and system. The group adjusting method comprises the following steps that all the quasi zero stiffness vibration isolating devices are adjusted to the initial state, balance position locking mechanisms are locked, and rigid negative-stiffness modules are formed through negative-stiffness systems and the balance position locking mechanism; load floating locking mechanisms are opened, the negative-stiffness modules and bases can relatively move, the multiple quasi zero stiffness vibration isolating devices are arranged below loads, hoisting of the loads is loosened, and the quasi zero stiffness vibration isolating devices can freely float; and all the quasi zero stiffness vibration isolating devices are adjusted to the work state, and the following steps that load floating locking mechanisms are locked, the negative-stiffness modules are fixed to the bases, negative-stiffness frames serve as fixing supports of the negative-stiffness systems, the balance position locking mechanisms are opened, and the negative-stiffness systems and positive-stiffness systems are connected in parallel to participate in vibration isolating are sequentially conducted. According to the method, the bearing balance position is automatically aligned, and the application capability in the large-size and large-load environment is improved.

Group adjusting method for quasi zero stiffness vibration isolating devices and vibration isolating device and system

The invention relates to a nonlinear stiffness vibration isolation system based on a hydraulic negative stiffness mechanism. The nonlinear stiffness vibration isolation system comprises hydraulic cylinders (2) and a rolling ball sliding channel bearing body (1), wherein, at least a pair of rolling ball sliding channels which is symmetrically distributed along the center axis of the side face of the rolling ball sliding channel bearing body (1) is arranged on the side face of the rolling ball sliding channel bearing body (1); each hydraulic cylinder (2) correspondingly abuts against a rolling ball sliding channel and the constant hydraulic force is applied to the rolling ball sliding channel bearing body (1) through the hydraulic cylinders (2), and the hydraulic cylinders (2) and the rolling ball sliding channel bearing body (1) form the hydraulic negative stiffness mechanism which provides the vertical negative stiffness; and a vertical positive stiffness spring (4) is further mountedat the bottom end of the rolling ball sliding channel bearing body (1), and vertical force is applied to the rolling ball sliding channel bearing body (1) through the vertical positive stiffness spring (4). According to the nonlinear stiffness vibration isolation system based on the hydraulic negative stiffness mechanism, compared with the prior art, nonlinear stiffness including quasi zero stiffness, piecewise linear stiffness and the like are achieved according to the required stiffness curve.

Nonlinear stiffness isolation system based on hydraulic negative stiffness mechanism

The invention discloses an electromagnetic negative stiffness vibration isolation system based on piezoelectric self-power supply and a control method thereof, and relates to the technical field of vibration suppression. The electromagnetic negative stiffness vibration isolation system based on piezoelectric self-power supply comprises a base, a cylinder, an electromagnetic negative stiffness assembly, a fixing base, a piezoelectric energy capture assembly, a load platform and a circuit system; the lower end of the electromagnetic negative stiffness assembly is connected with the base, the upper end of the electromagnetic negative stiffness assembly extends out of the upper surface of the fixing base, the piezoelectric energy capture assembly is fixed at the upper end of the electromagnetic negative stiffness assembly, and the load platform is arranged at the upper end of the piezoelectric energy capture assembly; and the piezoelectric energy capture assembly is connected with the input end of a rectifying circuit, the output end of a control circuit is connected with the electromagnetic negative stiffness assembly, and a rechargeable battery is used for supplying power to the rectifying circuit, a DC-DC voltage conversion circuit, an energy storage circuit and the control circuit. The system can effectively reduce the natural frequency of the system, not only has a good vibration isolation effect on high-frequency vibration interference, but also can effectively isolate low-frequency vibration of a foundation and the environment, and has the characteristics of self-power collection, power storage and power supply.

Electromagnetic negative stiffness vibration isolation system based on piezoelectric self-power supply and control method thereof

The invention relates to a shock absorption mechanism with the adjustable bearing force The shock absorption mechanism comprises a shock absorption body, force adjustment plugs, springs, force adjustment blocks and a pressure bearing seat, wherein a pressure bearing seat installation hole is formed in the upper end of the shock absorption body; force adjustment block installation holes are formedin two sides of the shock absorption body; threaded holes are formed in the middles of the force adjustment block installation holes; inclined planes are processed on the left side and the right sideof the bottom part of the pressure bearing seat; inclined planes are processed on the inner sides of the force adjustment blocks; the force adjustment blocks are inserted into the force adjustment block installation holes in two sides of the shock absorption body; the force adjustment plugs are in threaded connection to the outer ends of threaded holes in the middles of the two force adjustment block installation holes, and the springs are placed between the force adjustment plugs and the force adjustment blocks, so that the two force adjustment blocks stretch out toward one sides of the pressure bearing seat installation hole; and the lower end of the pressure bearing seat is inserted into the pressure bearing seat installation hole of the shock absorption body According to the shock absorption mechanism provided by the invention, the elastic force is adjustable

Shock absorption mechanism with adjustable bearing force

The invention discloses a quasi-zero stiffness vibration isolator. The quasi-zero stiffness vibration isolator comprises a central shaft, a fine adjustment nut, a first spring, an electromagnetic spring, a second spring and a spring fixing ring. One end of the central shaft is a load end, and the other end of the central shaft is a free end. The fine adjustment nut, the first spring, the electromagnetic spring, the second spring and the spring fixing ring sequentially sleeve the center shaft from the load end to the free end. The electromagnetic spring comprises a first end portion magnet ring, a middle electromagnetic ring and a second end portion magnet ring, wherein the first end portion magnet ring, the middle electromagnetic ring and the second end portion magnet ring sleeve the central shaft sequentially in the axial direction of the central shaft. The middle electromagnetic ring comprises an annular electric coil and a middle magnet ring, wherein the annular electric coil sleeves the center shaft, and the middle magnet ring sleeves the annular electric coil. The quasi-zero stiffness vibration isolator can realize quasi-zero stiffness in a long stroke and ensure the expansionof the effective vibration isolation frequency band under the condition that the bearing capacity is ensured. The quasi-zero stiffness vibration isolator can be applied to large amplitude conditions.The rigidity of the quasi-zero stiffness vibration isolator can be adjusted online by controlling current, so that the vibration isolation performance of the quasi-zero stiffness vibration isolator is further improved.

Quasi-zero stiffness vibration isolator

The invention discloses an electromagnetic type positive and negative stiffness parallel low-frequency vibration isolation device. The device comprises a foundation platform, an electromagnetic suspension platform, a plurality of supports, center type negative stiffness mechanisms and an external power supply, wherein the electromagnetic suspension platform is fixedly connected with the foundationplatform, the plurality of supports are uniformly distributed along the axial direction of the electromagnetic suspension platform and are fixedly connected with the foundation platform, one center type negative stiffness mechanism is arranged between the electromagnetic suspension platform and each support, and the electromagnetic suspension platform is electrically connected with the external power supply. The device is simple in structure, on-line adjustable in rigidity, free of friction, low in system damping, capable of achieving low inherent frequency and inhibiting and isolating microvibration in the vertical direction, suitable for different cases, capable of effectively attenuating micro vibration in a large-frequency-band range and providing reliable guarantee for precision machining and measuring equipment in a micro-vibration environment.

Electromagnetic type positive and negative stiffness parallel low-frequency vibration isolation device

The invention discloses a mass center adjustable mixed type vibration damping platform. The mass center adjustable mixed type vibration damping platform comprises top platforms, a bottom platform, vibration damping units and mass center adjusting units, the plurality of vibration damping units are obliquely arranged between the top platforms and the bottom platform, one mass center adjusting unitis arranged between each vibration damping unit and the top platform, and the mass center adjusting units and the vibration damping units are arranged in the same axial direction; the mass center adjusting units comprise upper screw rods, sleeves and connecting rods, through holes are axially formed inside the sleeves, each of the top and the bottom of each through hole is provided with a thread section, the top ends of the upper screws are connected with the top platforms, the bottom ends of the upper screws are in threaded connection with threaded sections at the tops of the through holes, the top ends of the connecting rods are in threaded connection with the threaded sections at the bottoms of the through holes, and the bottom ends of the connecting rods are connected with the vibration damping units. The mass center adjusting units can realize platform mass center adjustment and pose adjustment, so that the mass center of a rigidity center and the mass center of a vibration damping system (including a vibration damping object and a rigid pedestal) are arranged on the same vertical line, and the vibration damping and vibration isolation effect can be greatly enhanced.

Mass center adjustable mixed type vibration damping platform

The invention discloses a Stewart configuration-based vibration damper. The vibration damper comprises an upper platform, a lower platform, vibration damping assemblies and limiting pieces; the vibration damping assemblies and the limiting pieces are evenly distributed between the upper platform and the lower platform; and the length of each vibration damping assembly when the vibration damping assembly is compressed to the maximum extent is not greater than the limiting length of each limiting piece. The Stewart configuration-based vibration damper is a vibration damper patent of a novel passive element, and is mainly used for marine environments; dual limiting mechanisms are employed to avoid that leaf springs are destroyed by high impact, high loading or horizontal swinging; by structural optimization design, occupied area of surfaces of the platforms is reduced; and compared with a traditional Stewart configuration-based vibration damper, the Stewart configuration-based vibration damper is small in occupied area and compact in structure, and fully utilizes space between the upper platform and the lower platform.

Stewart configuration-based vibration damper

The invention discloses a six-degree-of-freedom absolute pose measuring device based on quasi-zero stiffness. The six-degree-of-freedom absolute pose measuring device comprises a reference platform, ato-be-measured platform, a pose resolver and six quasi-zero stiffness supporting legs of the same structure. Currents in opposite directions are respectively supplied to a lower end coil and an upperend coil, at the moment, two coils generate an electromagnetic field in the surrounding space, the electromagnetic field interacts with the magnetic fields of the lower magnet and the upper magnet togenerate electromagnetic rigidity opposite to rigidity of the spring, and the rigidity of the spring and the electromagnetic negative rigidity are mutually counteracted, so the rigidity of the wholesupporting leg is close to zero rigidity; when the to-be-tested platform moves in the space, the motion cannot be transmitted to the reference platform, so the reference platform is in a static state;at the moment, deformation of the six supporting legs can be measured through the laser displacement sensors, six sets of deformation are input into an pose resolver, and the displacement and attitude of the to-be-measured platform can be solved through kinematics positive solution of the six-degree-of-freedom device.

Six-degree-of-freedom absolute pose measuring device based on quasi-zero stiffness

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