16results about How to "Change the stiffness" patented technology

The invention discloses an induction power generation and frequency modulation vibration reduction integrated ballastless track vibration reduction structure, and belongs to the technical field of track traffic. A track plate and a base plate are longitudinally laid along a track line, and the track plate is located above the base plate; the adjusting layer is arranged between the track plate and the base plate; an elastic vibration reduction layer is arranged between the base plate and the piezoelectric device layer, and the elastic vibration reduction layer is filled in a limiting structure in the base plate; a silicon steel sheet iron core structure of an electromagnetic coil is arranged in the elastic vibration reduction layer in the limiting structure; the piezoelectric device layer is located between the adjusting layer and the base plate and connected with the electromagnetic coil through a wire. The piezoelectric material and the magneto-rheological elastomer material are adopted, integration of induction power generation and frequency modulation vibration reduction is achieved, when the pressure is not enough to enable the piezoelectric device to output current, the magneto-rheological elastomer material still has the mechanical property of a common rubber elastomer, the whole structure still can guarantee the vibration reduction function, and meanwhile power-off protection is achieved.

The invention relates to the technical field of vehicles, in particular to an air spring rigidity adjusting system and a vehicle. The air spring rigidity adjusting system comprises two air spring sets which are oppositely arranged on the two sides of the vehicle, and each air spring set comprises at least one air spring. The air storage device comprises at least two air storage cylinders, and the air springs are connected with the air storage cylinders through air paths; the valve group comprises a plurality of valves, and the plurality of valves are respectively arranged in the gas path; the air spring is used for being communicated with different air storage cylinders through opening and closing of the multiple valves. The air springs are communicated with the air storage cylinders with different volumes to adjust the rigidity of the air springs, so that the rigidity of the air springs on the two sides of the vehicle can be changed, the rigidity of the air springs on the two sides of the vehicle can be switched in real time according to the driving condition of the vehicle during driving, and the vehicle obtains excellent stability and trafficability.

The invention provides a hydraulic spring auxiliary vibration device for linear friction welding, which comprises an electro-hydraulic excitation system and a vibration platform, the vibration platform is used for clamping a workpiece to be welded, the electro-hydraulic excitation system is used for applying linear reciprocating motion to the workpiece to be welded, and the hydraulic spring auxiliary vibration device is characterized by further comprising a hydraulic spring, the hydraulic spring is located below the vibration platform, a piston rod is arranged in the hydraulic spring, one end of the piston rod makes contact with the vibration platform, and the piston rod does linear reciprocating motion under the action of the vibration platform; elastic dampers acting on the two sides of the piston rod are arranged in the hydraulic spring and used for widening the excitation frequency of the electro-hydraulic excitation system. By changing the rigidity of the system, the resonant frequency of the linear friction welding electro-hydraulic excitation system is widened, the tracking control performance of the electro-hydraulic excitation system is improved, and it is guaranteed that the linear friction welding performance is more reliable.

The vibration damping system of the steering wheel is used for damping vibration of a bridge plate installed on a hub of the steering wheel and comprises a fastening piece, an elastic body, a supporting piece and a bias piece, the elastic body comprises a cylindrical base portion arranged in an installation hole of the bridge plate, a first limiting portion and a second limiting portion, and the first limiting portion and the second limiting portion are clamped on the two sides of the bridge plate. A first notch is formed in the radial outer contour of the second limiting part and penetrates through the two end faces, in the thickness direction, of the second limiting part. The first notches are formed in the second limiting parts, the first axial protrusions are arranged on the radial supporting parts, located below the second limiting parts, of the supporting pieces, and when the bridge plate is stressed to move towards the hub, the first axial protrusions penetrate through the first notches to abut against the bridge plate and are inserted into the first notches, so that the rigidity of the elastic bodies can be changed, and the rigidity of the elastic bodies is changed. Therefore, the frequency of the elastomer is changed.

The present invention discloses a vibration isolation and vibration reduction support based on memory alloy, comprising a leaf spring group, an upper panel and a lower panel, wherein the leaf spring group is made of memory metal; when working, when the upper panel or the lower panel is under the vibration load, the relative vertical spacing between them will change, on the one hand, the memory alloy leaf spring group is compressed and deformed to absorb energy or recover to its original state to release energy, thus achieving the purpose of vibration isolation and vibration reduction by relying on the unique structure and material characteristics of the memory alloy leaf spring group, on the other hand, the memory alloy rope is also stretched or retracted with the alternating deformation of the memory alloy leaf spring group, and the structure and material function of the memory alloy rope provide greater hysteresis energy consumption and restoring force. The present invention can effectively resist vertical vibration, has good damping effect, strong energy consumption capacity, has extremely high reliability and stability when working for a long time, and can automatically recover after re-vibration without the need for additional reset device.

The present invention discloses a temperature-pressure integrated fiber grating sensor and a human sleep multi-vital sign monitoring system. The system comprises a mattress, a plurality of temperature-pressure integrated fiber grating sensors, a demodulator, and a host computer. The plurality of vital sign fiber grating sensors are fixedly arranged in a gap between a mattress and a bed net, and their depths are kept at the same horizontal plane. The plurality of vital sign fiber grating sensors are connected to the demodulator to transmit data to the host computer. The present invention identifies the pressure exerted on the sensor by detecting the wavelength of a fiber grating spectrum signal peak splitting point, identifies the ambient temperature of the sensor by detecting the center wavelength drift of the fiber grating spectrum signal, monitors the multi-vital sign information of the user in bed, including the respiratory rate, heart rate, and the state of falling out of bed, etc. The system has the advantages of simple structure, small size, anti-electromagnetic interference, low cost, etc.

The application discloses a piezoelectric driving mechanism bending deformation variable stiffness scanning probe, which comprises a base, a deformation mechanism and a probe needle, the deformation mechanism comprises two deformation units which are fixed in a stack, the deformation unit comprises a circular ring and at least three V-shaped cantilever beams, the at least three V-shaped cantilever beams are arranged in the circular ring, one end of the at least three V-shaped cantilever beams is connected with the circular ring, and the other end is connected with each other and the connection position is located at the center of the circular ring; piezoelectric driving units and strain sensing units are arranged between the V-shaped cantilever beams of the two deformation units, and all the piezoelectric driving units are connected in parallel; the circular rings of the two deformation units are fixedly connected with the base, and the probe needle is connected with the other end of the V-shaped cantilever beams. The application can realize the large-range variable stiffness of the scanning probe to adapt to different modulus surfaces while the static and dynamic performances of the scanning probe are considered.

The invention provides a resonator and electronic equipment, and relates to the technical field of resonance. The resonator provided by the invention comprises a substrate, the substrate is provided with at least two cantilever beams, the two cantilever beams are symmetrically arranged relative to the center of the substrate, and each cantilever beam is provided with a first hole. The resonator structure provided by the invention is small in size, can excite the in-plane mode and the out-of-plane mode, and can achieve the switching of the two modes.

This utility model belongs to the technical field of shock absorbers, and provides a sheet-type shock-absorbing rubber component, including a double-ended screw, an upper connecting plate and a lower connecting plate respectively sleeved at the upper and lower ends of the double-ended screw, a sheet-type composite shock-absorbing mechanism sleeved in the middle of the double-ended screw and located between the upper and lower connecting plates, and adjusting nuts disposed at the upper and lower ends of the double-ended screw and located outside the upper and lower connecting plates respectively. This utility model includes a double-ended screw, upper and lower connecting plates, a sheet-type composite shock-absorbing mechanism, and adjusting nuts. The sheet-type composite shock-absorbing mechanism achieves an asymmetrical stiffness structure through a layered design, resulting in a compact structure and excellent shock absorption effect. Simultaneously, by rotating the adjusting nut, the compression of the multi-layer shock-absorbing units can be controlled, thereby changing its overall stiffness and damping characteristics. Users can flexibly adjust it according to different loads and shock absorption requirements, greatly improving the product's applicability and practicality.

This invention provides an underwater bistable variable stiffness rigid-flexible coupled hydraulic mechanical gripper, belonging to the technical field of robot end effectors. This manipulator combines flexible fit with gripping stiffness and offers a fast response speed. The drive module, finger modules, transmission module, and variable stiffness module are all mounted on a support module. The output of the drive module is connected to each finger module via the transmission module, and the output of the variable stiffness module is connected to each finger module via the bistable module. The drive module's operation drives multiple finger modules to perform gripping actions through the transmission module, while the variable stiffness module's operation adjusts the structural stiffness of multiple finger modules through the bistable module. This mechanical gripper integrates the lossless compliance of soft actuation, the high-speed response of a bistable mechanism, and the strong load-bearing capacity of a rigid structure. It can stably grip objects of different masses and shapes in underwater environments, exhibiting strong adaptability and high operational efficiency.

The present invention provides a wind tunnel vibration test device suitable for high wind attack angles, belonging to the technical field of wind tunnel vibration test, comprising: a fixed bracket, a rotating bracket, an elastic stretching component, an elastic torsion component and a synchronous rotation driving mechanism, wherein two rotating brackets are symmetrically and rotationally mounted on the fixed bracket; a slide rail is provided on the rotating bracket, and a sliding block with sliding fit is provided on the slide rail; the two ends of the segment model to be measured for vibration are rotationally mounted on the two sliders, and the moving direction of the slider is perpendicular to the upper plane of the segment model; the elastic stretching component is correspondingly connected between the slider and the rotating bracket on the same side, and the telescopic direction of the elastic stretching component is consistent with the moving direction of the slider; the two elastic torsion components are connected between the two ends of the segment model and the slider on the same side; the synchronous rotation driving mechanism drives the rotating bracket, the elastic stretching component and the segment model to rotate synchronously. The present invention can improve the accuracy of the vibration measurement results of the segment model wind tunnel test, and has good versatility.

The present application relates to the technical fields of energy collection, and particularly relates to a electromagnetic-piezoelectric-friction composite energy collector for low-frequency vibration energy, which comprises an electromagnetic power generation unit, a piezoelectric power generation unit, a friction power generation unit and a tuning mechanism, the electromagnetic power generation unit comprises a coil, a rolling magnet, a center magnet and a return magnet, the coil is embedded in the lower surface of the upper shell and the upper surface of the lower shell in two layers, corresponding to the sweeping area of the rolling magnet and connected in series; the piezoelectric power generation unit comprises a contact piezoelectric module and a collision piezoelectric module, the contact piezoelectric module is a cantilever beam structure, the friction power generation unit comprises a friction layer arranged on the outer surface of the rolling magnet and multiple groups of electrodes; the present application solves the technical problems of single piezoelectric transduction mode, low control precision and complicated operation in the prior art.

This invention provides a transnasal interventional variable stiffness flexible bone-grinding robot and a stiffness control method, comprising a grinding mechanism, an inner arm drive mechanism, and an outer arm drive mechanism. The outer arm continuum of this application is composed of snake bone continuum units, which enable it to have both high flexibility and high stiffness. After the outer arm continuum enters the surgical cavity, it can provide a high-stiffness working space for the inner arm continuum and the drill bit. By simultaneously axially stretching / compressing the tendon, the compression or extension of the distal spring of the inner arm continuum can be controlled, thereby changing the stiffness of the distal end of the inner arm continuum. When feeding, the spring is stretched to reduce stiffness, making it more flexible and conducive to reaching the surgical area. When the grinding drill bit is working, the spring is compressed, making it have high stiffness so that it does not damage non-disease tissue when the drill bit grinds bone, realizing the function of adjustable stiffness, which is more conducive to the needs of surgical operation.

The application relates to the technical field of vibration reduction, and discloses a control method for a vibration reduction device, which is applied to the vibration reduction device, the vibration reduction device being an inner-outer double-layer structure capable of being folded or unfolded; the stiffness of the vibration reduction device is different when the vibration reduction device is in a folded state or an unfolded state; the control method comprises the following steps: acquiring the operating frequency of a compressor; determining the target state of the vibration reduction device according to the operating frequency of the compressor; and controlling the operation of the vibration reduction device according to the target state. In this way, the stiffness of the vibration reduction device is changed by controlling the folding and unfolding of the vibration reduction device, and the modal frequency of the compressor is changed. Therefore, the compressor can be prevented from resonating, and the vibration reduction effect of the vibration reduction device on the compressor is improved. The application further discloses a control device for the vibration reduction device, an air conditioner and a storage medium.

The utility model relates to the technical field of rehabilitation instruments, and discloses a limb rehabilitation training device with a variable stiffness function, which comprises a casing, a support frame is fixedly mounted in the casing, two pairs of bearing seats are fixedly mounted in the support frame, and rotating shafts are rotatably mounted in the bearing seats; a guide shaft support is rotationally mounted in the center of the supporting frame through a rotating seat, one end of a guide shaft is fixedly mounted in the guide shaft support, and the guide shaft is sleeved with a sliding block; the ends, away from each other, of the two rotating shafts on the upper side are each rotationally provided with one end of a swing rod, the other ends of the swing rods are fixedly provided with the same cross rod, the sliding blocks are provided with elastic pieces, and the supporting frame is provided with an adjusting assembly used for lifting the sliding blocks. The limb training rigidity of a patient can be changed, the structure is simple, work is stable, and therefore on the premise that man-machine interaction safety is guaranteed, the control accuracy of the training device can be kept accurate for a long time, and the device is more reliable in overall operation, longer in service life and better in durability.

A foil thrust air bearing imitating a whale stomatal muscle structure comprises a bearing base, a whale stomatal muscle-like bump foil structure and a flat foil, and the bearing base comprises an L-shaped mounting groove, an air supply hole I, an air supply hole II, a boss and a magnetic strip. The whale stomatal muscle-like bump foil structure comprises a magnetic attraction base, a bump foil structure air inlet guide pipe and a bump foil body, the flat foil comprises a foil plane and a foil buckle, and the whale stomatal muscle-like bump foil structure is characterized in that the L-shaped mounting grooves and the bosses are alternately and uniformly distributed on the bearing base in the circumferential direction, the air supply holes I are uniformly distributed on the bosses in the circumferential direction, and the air supply holes II are communicated with the bosses in the circumferential direction. The air supply holes II are evenly distributed in the two sides of the air supply hole I in the radial direction, the magnetic strips are located at outlets of the air supply holes II, the whale stomatal muscle-like bump foil structure is located on the bearing base, and the bump foil structure air inlet guide pipes are installed in the air supply holes II. The magnetic attraction base is located at the bottom end of the bump foil structure similar to the whale stomatal muscle and matched with the magnetic strip, the flat foil is located on the bump foil body, and the foil buckle is installed in the L-shaped installation groove.