34results about How to "Appropriate damping" patented technology

A micromechanical component having at least two caverns is provided, the caverns being delimited by the micromechanical component and a cap, and the caverns having different internal atmospheric pressures. The micromechanical component and cap are hermetically joined to one another at a first specifiable atmospheric pressure, then an access to at least one cavern is produced, and subsequently the access is hermetically closed off at a second specifiable atmospheric pressure.

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.

A volute for a radial turbomachine is proposed. The turbomachine includes a radial compressor or a radial turbine. The volute is in particular for a radial compressor. The volute has a substantially annular cavity which is delimited at least by a first radial side surface. At least one substantially annularly circumferential groove is formed in the side surface.

A method of designing a PSS (Power System Stabilizer) based on wide-area multi-signal input hierarchical control includes the following steps: (1) using a high-precision identification algorithm to directly derive a precise low-order linear model of a system through field measurement data or nonlinear time-domain simulation; (2) selecting multiple wide-area signals with strong observability and controllability from the whole system as the feedback input of controllers; (3) implementing hierarchical control; (4) designing a different fixed time delay compensation link for each mode in order to eliminate the influence of the time delay of the wide-area signals on the control effect; and (5) superposing signals output by mode controllers and taking the superposed signal as final control output of a PSS based on wide-area multi-signal input hierarchical control. The method has the following advantages: (1) an optimal damping effect can be achieved with minimum control cost; (2) the PSS has a better control effect and higher robustness than the traditional controller, and is beneficial to engineering practice; (3) a better control effect can be achieved; and (4) the overall control effect is better.

Disclosed is a structural vibration damping device, which comprises a piezoelectric element adapted to be mounted on a structure, a shunt circuit inserted between two electrodes of the piezoelectric element, and an electric circuit for selectively opening and closing the shunt circuit. In this damping device, the electric circuit is operable, when a voltage between the electrodes of the piezoelectric element has a positive or negative extreme value due to a vibration of the structure, to close the shunt circuit so as to allow a current to flow between the electrodes of the piezoelectric element, and, when the current is reduced to zero, to open the shunt circuit so as to preclude the current flow until a voltage between the electrodes of the piezoelectric element subsequently has the extreme value. Further, each of the shunt circuit and the electric circuit is designed to be operated using only a power generated by the piezoelectric element. The damping device of the present invention makes it possible to achieve high-performance power-free damping with enhanced reliability and maintainability.

The invention relates to a semi-active particle damping rubber suspension device for a power assembly. According to the technical scheme of the semi-active particle damping rubber suspension device for the power assembly, the middle of a rubber spring (3) is coaxially embedded in a connecting framework (2), and the open end of the rubber spring (3) is fixedly connected with the open end of a suspension shell (5) in a face-to-face mode through a steel ring (4). The upper end face and the lower end face of an outer steel pipe (11) are coaxially connected with the lower plane of the connecting framework (2) and the upper plane of a base plate (10) correspondingly, the upper end face and the lower end face of an inner steel pipe (12) are coaxially connected with the lower plane of the connecting framework (2) and the upper plane of the base plate (10) correspondingly, steel balls (14) are contained in a damping cavity (15), and the volume of the steel balls (14) is 50%-80% of the volume of the damping cavity (15). An electromagnetic coil (13) is installed on the outer wall of the outer steel pipe (11) and is located on the upper plane of the base plate (10), the electromagnetic coil (13) is externally connected with a controller of a suspension assembly through a coil socket (6) which is fixed to the suspension shell (5), and the coil socket (6) is fixed to the suspension shell (5). The semi-active particle damping rubber suspension device for the power assembly has the advantages of being simple and reliable in structure, convenient to manufacture and low in cost, and the wideband vibration isolation performance, the vibration reduction performance and the noise reduction performance are achieved.

Disclosed is a structural vibration damping device, which comprises a piezoelectric element adapted to be mounted on a structure, a shunt circuit inserted between two electrodes of the piezoelectric element, and an electric circuit for selectively opening and closing the shunt circuit. In this damping device, the electric circuit is operable, when a voltage between the electrodes of the piezoelectric element has a positive or negative extreme value due to a vibration of the structure, to close the shunt circuit so as to allow a current to flow between the electrodes of the piezoelectric element, and, when the current is reduced to zero, to open the shunt circuit so as to preclude the current flow until a voltage between the electrodes of the piezoelectric element subsequently has the extreme value. Further, each of the shunt circuit and the electric circuit is designed to be operated using only a power generated by the piezoelectric element. The damping device of the present invention makes it possible to achieve high-performance power-free damping with enhanced reliability and maintainability.

The invention discloses an inflatable vibration damper, which consists of an inflatable rubber bag, a metal mounting component and a gas charging connector component. The mounting component and the gas charging connector component are vulcanized as a whole by the inflatable rubber bag through means of vulcanization technique and the shape of the mounting component is matched with a device requiring vibration damping. The vibration damper has the advantages of wide application field, strong overloading resistance, compact structure, adjustable rigidity and the like and is applicable to occasions needing stable, accurate and precise dynamic systems, such as the vibration damping of a field testing device.

The present invention provides a vibration damping device which can enhance a vibration damping effect even in a case where a vibration damping target position and a vibration damping force generation position are different from each other. The vibration damping device includes a vibration detecting unit for detecting a vibration which is caused by a vibration generating source and is transmitted to a position at which the vibration is to be damped; a vibration application unit which generates a vibration damping force to cancel the vibration, and is provided at a position different from the position at which the vibration is to be damped; a vibration application command generating unit for outputting a vibration application command to generate the vibration damping force in the vibration application unit, based on the vibration detected by the vibration detecting unit; and a vibration application command correcting unit which imparts to the vibration application command, a reverse property of a vibration damping force transmission path including a vibration transmission property from a position at which the vibration application unit is mounted to the position at which the vibration is to be damped, and then outputs the vibration application command to the vibration application unit.

The invention discloses a system for utilizing rainwater to irrigate a potted plant. The system comprises a rainwater receiver, a water storage tank, a filter, a pipeline, the potted plant, a rain sensor, a sliding ring, pulling rods, a motor and a vertical rod. The system is characterized in that the lower end of the rainwater receiver is fixedly connected with the upper end of the water storagetank, and an opening of the rainwater receiver faces upwards; the bottom of the water storage tank is fixedly connected with the end, away from the sliding ring, of the vertical rod; the filter is fixedly connected with the water storage tank; the filter and the potted plant are fixedly connected to the two ends of the pipeline respectively; the rain sensor is fixedly mounted on the upper portionof the end, close to the sliding ring, of the vertical rod; the sliding ring can slide up and down on the surface of the vertical rod; the sliding ring is hinged to one end of each pulling rod, and the rain receiver is fixedly connected to the other end of each pulling rod; the motor is mounted in an inner cavity of the interior of the lower end of the vertical rod. The system can automatically sense rainy days and open the rainwater receiver to collect rainwater, so that the space occupancy rate is decreased, and meanwhile impurities in the rainwater are filtered out; the filtered rainwater is directly transported to the potted plant, so that water of water resources is reduced, and meanwhile labor burden on people is reduced. The system is simple in structure, reliable in function, low in cost and suitable for mass industrial production.

The invention relates to a constant-current and constant-voltage composite type floating hydrostatic guide rail, which comprises a main guide rail (1), a reverse preloading guide rail (2), a base (3) and a worktable surface (4), wherein the main guide rail (1) and the reverse preloading guide rail (2) form a closed type hydrostatic guide rail to realize a supporting function, the main guide rail (1) is a constant-current hydrostatic guide rail, and consists of a movable guide rail and a fixed guide rail, the main guide rail (1) on the worktable surface (4) is the movable guide rail, the main guide rail (1) on the base (3) is the fixed guide rail, and the reverse preloading guide rail (2) is the constant-current and constant-voltage composite type floating hydrostatic guide rail. The constant-current and constant-voltage composite type floating hydrostatic guide rail has the advantages that a high-speed and low-speed indexing function of a rotary table is met, and an assembly process and a control method are simple and reliable.

An earphone is worn on an ear of a user. The earphone comprises a vocal monomer and a sound film assembly. The sound film assembly comprises an assembling ring and a passive sound film. The vocal monomer is arranged at one end, close to the ear of the user, of the assembling ring. The passive sound film closes one end, far away from the ear of the user, of the assembling ring. The passive sound film, the assembling ring and the vocal monomer together form a rear cavity chamber.

A micromechanical component having at least two caverns is provided, the caverns being delimited by the micromechanical component and a cap, and the caverns having different internal atmospheric pressures. The micromechanical component and cap are hermetically joined to one another at a first specifiable atmospheric pressure, then an access to at least one cavern is produced, and subsequently the access is hermetically closed off at a second specifiable atmospheric pressure.

Apparatus is disclosed for securing a sonde to the inner wall of a well casing (3). The sonde (2) comprises a clamp (2) expandable from a contracted position to an expanded position in which the clamp can engage the inner wall. The securing apparatus comprises a member (5,6) for releasably engaging with the clamp (2) to hold the clamp in the contracted position; a spring (7) connected to the member such that when the spring is in a compressed state, the member is constrained into engagement with the clamp to hold the clamp in the contracted position; and a mechanism (8,9,10) for holding the spring (7) in its compressed state during a 10 first mode of operation and, in a second mode of operation, for releasing the spring (7) from its compressed state thus disengaging the member (5,6) from the clamp to permit the clamp to expand into its expanded position, the mechanism including a material (11) which in the first mode of operation, is in a solid state and, in the second mode of operation, is in a liquid state.

A damping control device is configured to acquire, as a preview condition amount, an unsprung condition amount at a predicted passing position where a wheel of a vehicle is predicted to pass, based on preview reference data being sets of data in which unsprung condition amounts and pieces of positional information of the wheel are linked to each other. The unsprung condition amounts indicate a displacement condition of an unsprung portion displaced in a vertical direction due to a displacement of a road surface acquired when the vehicle has traveled on the road surface. The damping control device is configured to execute, at a timing when the wheel passes through the predicted passing position, preview damping control to cause control force to agree with a target control force.

An electrochemical gas sensor (1) measures gaseous components in an air / gas mixture. A measuring electrode (4) and a counterelectrode (5), with an electrolyte (7) located therebetween, are arranged in the sensor housing. A diffusion barrier (15) is configured to set a gas flow of the gas intended for the concentration determination to the measuring electrode (4) from a surrounding area. The diffusion barrier is located in the sensor housing (2). At least one gas-permeable, hydrophobic pressure absorption element (16) covers the diffusion barrier (15) and is provided between the diffusion barrier (15) and the measuring electrode (4), in the interior of the sensor housing (2) and on an inner surface (18) of the sensor housing (2). The inner surface (18) has a mean roughness depth Rz that is lower than or equal to 2 μm at least in an area on which the pressure absorption element (16) lies.

An axle suspension system for a front axle of a tractor using shock absorbers and an air bellows between the front axle and a front frame portion of the tractor to control the height of the front frame portion relative to the front axle. The position of the front frame portion may be maintained at a substantially constant vertical position, providing for improved driver comfort. The air bellows are positioned between the front axle and the front frame portion, thereby eliminating the need for additional mounting subframes in the suspension system.

The invention relates to a high-efficiency damping backing plate which a unique structure and two bearing modes include a basic bearing mode and an additional bearing mode. When under dynamic loading, the high-efficiency damping backing plate adopts the basic bearing mode to bear, uses comprehensive effects of stretching, shearing, deflecting and appropriate compression deformation to provide elasticity and has low natural frequency, low dynamic / static stiffness ratio, appropriate damping ratio and good dynamic elasticity. Under accidental circumstances, when dynamic vertical load increases suddenly and exceeds the safety threshold, the high-efficiency damping backing plate automatically adopts the additional bearing mode to bear, and the stiffness of supporting points increases automatically and nonlinearly to be 2 to 3 times of the original stiffness, thus the safety reliability is improved. The high-efficiency damping backing plate can be used for the straight section and the bended section of the rail for transportation.

The invention discloses a vibration plate and a sound production device. The vibration plate comprises at least one composite fiber layer and at least one foaming body material layer, the at least one composite fiber layer and the at least one foaming body material layer are arranged in a stacked mode, and composite fibers in the composite fiber layer comprise carbon fibers. According to the technical scheme, the modulus of the vibration plate can be improved, and the frequency response range of the vibration plate is widened.

The invention discloses a mini-tiller tensioning wheel mechanism, which comprises a support frame and a tensioning wheel abutted against a transmission belt; the mini-tiller tensioning wheel mechanism also comprises a speed reducing shaft, wherein the speed reducing shaft is connected onto the support frame, the tensioning wheel is arranged at one end of the speed reducing shaft through a bearing in a sheathing way, the other end of the speed reducing shaft extends into a gearbox and is connected with a friction disc, and the friction disc is close to a transmission shaft and is used for speed reduction. The mini-tiller tensioning wheel mechanism has the advantages that the tensioning wheel and the friction disc are arranged on the speed reducing shaft, the tensioning wheel can realize the tensioning on a belt through the vertical or transverse movement of the speed reducing shaft, meanwhile, the rotating speed of an output shaft can be reduced through the friction disc, and the speed reducing goal is achieved, so the tensioning wheel can realize the self regulation through the fastening and loosening along with the operation process of the belt or a chain, the proper damping is ensured, the vibration is reduced, and the equipment operation stability is ensured.

The invention discloses a mini-tiller tensioning wheel mechanism, which comprises a support frame and a tensioning wheel abutted against a transmission belt; the mini-tiller tensioning wheel mechanism also comprises a speed reducing shaft, wherein the speed reducing shaft is connected onto the support frame, the tensioning wheel is arranged at one end of the speed reducing shaft through a bearing in a sheathing way, the other end of the speed reducing shaft extends into a gearbox and is connected with a friction disc, and the friction disc is close to a transmission shaft and is used for speed reduction. The mini-tiller tensioning wheel mechanism has the advantages that the tensioning wheel and the friction disc are arranged on the speed reducing shaft, the tensioning wheel can realize the tensioning on a belt through the vertical or transverse movement of the speed reducing shaft, meanwhile, the rotating speed of an output shaft can be reduced through the friction disc, and the speed reducing goal is achieved, so the tensioning wheel can realize the self regulation through the fastening and loosening along with the operation process of the belt or a chain, the proper damping is ensured, the vibration is reduced, and the equipment operation stability is ensured.

The invention discloses a vibration plate and a sound production device. The vibration plate comprises at least one composite fiber layer, and composite fibers in the composite fiber layer comprise polyamide fibers and carbon fibers. According to the technical scheme of the invention, the sound production device has a good sound production effect.

A method of designing a PSS (Power System Stabilizer) based on wide-area multi-signal input hierarchical control includes the following steps: (1) using a high-precision identification algorithm to directly derive a precise low-order linear model of a system through field measurement data or nonlinear time-domain simulation; (2) selecting multiple wide-area signals with strong observability and controllability from the whole system as the feedback input of controllers; (3) implementing hierarchical control; (4) designing a different fixed time delay compensation link for each mode in order to eliminate the influence of the time delay of the wide-area signals on the control effect; and (5) superposing signals output by mode controllers and taking the superposed signal as final control output of a PSS based on wide-area multi-signal input hierarchical control. The method has the following advantages: (1) an optimal damping effect can be achieved with minimum control cost; (2) the PSS has a better control effect and higher robustness than the traditional controller, and is beneficial to engineering practice; (3) a better control effect can be achieved; and (4) the overall control effect is better.

The invention discloses a damping type car door installation structure. The damping type car door installation structure comprises a car body, a car door, a damping hinge and a car door limiter, wherein the car body and the car door are connected through the damping hinge and the car door limiter; a cam spring abutting structure is arranged in the damping hinge; the car door limiter comprises a shell; a first hydraulic oil cylinder and a second hydraulic oil cylinder are arranged in the shell, and the first hydraulic oil cylinder and the second hydraulic oil cylinder are opposite in direction, are both arranged in the length direction of the shell and communicate with each other through two guide tubes; a limiter holder is hinged to the front end of a piston rod A of the first hydraulic oil cylinder; a piston rod B of the second hydraulic oil cylinder penetrates out along the rear end of the shell; a groove for containing the shell is formed in the position, corresponding to the end of the piston rod B, of the car door; a second hinge pin is fixedly arranged in the groove; and the end of the piston rod B is hinged to the second hinge pin. In the opening or closing process of the car door, the hinge and the limiter achieve the resistance effect to the car door simultaneously, and impact caused by opening or closing of the car door under special terrain conditions like slopes is reduced. The damping type car door installation structure has the advantages that the structure is novel, the service life is prolonged, and reliability is high.

The invention discloses a buffer protection adjustable swing arm position device for a single-rotor UAV (unmanned aerial vehicle) servo control system. The buffer protection adjustable swing arm position device for the single-rotor UAV servo control system is characterized in that the device comprises an active swing arm, a buffer connecting rod and an executive swing arm; the active swing arm isconnected with an output shaft of a servo control actuator of a servo control system, and the active swing arm is driven to rotate by the output shaft; the executive swing arm is fixed on a frame of asingle-rotor UAV through a hinge, and the executive swing arm can rotate round the hinge; the buffer connecting rod is connected between the active swing arm and the executive swing arm and used fortransferring the rotation of the active swing arm to the executive swing arm; the buffer connecting rod is used for absorbing impact energy by self deformation or destruction when the single-rotor UAVis subjected to an impact that can damage a servo control actuator. The buffer protection adjustable swing arm position device for the single-rotor UAV servo control system has the advantage of effectively solving the problem that the servo control system that controls rotor pitch is vulnerable to impact damage when a single-rotor unmanned helicopter falls.