398results about How to "Small damping" patented technology

The invention provides a capacitive acceleration sensor with an acoustic cavity, comprising a sensor frame, an acceleration detection structure composed of a detection quality block and an elastic vibrating diaphragm, and a back plate with damping holes and limit embosses, wherein, the detection quality block is arranged at the center of the acceleration sensor and is connected with the sensor frame by the surrounding elastic vibrating diaphragm; the damping holes manufactured on the back plate are used for adjusting system damping, and the limit embosses are used for preventing adhesion or damage in the case of overload; the detection quality block is parallel to the back plate, and detection capacitances are respectively formed on the opposite surfaces of the detection quality block andthe back plate; and the fact that the sensor frame is internally provided with an acceleration detection structure and internally formed with the acoustic cavity after the back plate is closed can improve frequency response. The sensor structure of the invention has lower requirement on the vacuum degree of the acceleration sensor, and can adjust important parameters such as a quality factor Q andthe like which can adjust a system by changing density and size of the damping holes and volume of the acoustic cavity and the like, thus realizing larger flexibility on design and manufacture.

A physiological function assisting device 1 is embedded in the body, and is provided with a transmitter 11 and receiver 12 for communicating with an external controller 2. External controller 2 controls embedded physiological function assisting device 1 from the outside. External controller 2 is provided with a transmitter 21 and receiver 22 for communicating with physiological function assisting device 1. Transmitters 11,21 modulate the plane of polarization of laser light, and emit the result as a transmission signal. Receivers 12,22 selectively receive light of a specific polarization state. Receivers 12,22 respectively output electric signals corresponding to the polarization state (polarization angle or ellipticity) of the received light. As a result, full duplex communications between a strongly dispersing medium like the human body and the outside is possible, while the power consumed by the internal device can be reduced.

The invention discloses a silicon resonant air pressure sensor based on Micro-Electro-Mechanical Systems (MEMS), the air pressure sensor mainly comprises a resonance beam membrane silicon chip, a lower cover substrate, a support substrate, a metal tube seat and a tube cap. The lower cover substrate and the resonance beam membrane silicon chip are in vacuum bonding to form a reference vacuum cavity, and the support substrate which is relatively small is fixed on the metal tube seat to isolate packaging stress and thermal stress. According to pressure difference between atmosphere to be measured and the reference vacuum cavity, axial direction stress of a clamped microstructure beam on a pressure membrane is changed, thus resonant frequency of the beam is changed, change of the resonant frequency is detected and air pressure measurement is realized. According to the invention, a resonator is placed in an air pressure medium, packaging difficulty is lowered substantially, and the packaging stress and thermal stress are isolated through cantilever supporting. The silicon resonant air pressure sensor has the advantages of simple manufacture and packaging, good stability and the like, and is suitable for high performance air pressure measurement.

The invention discloses a car bumper provided with an energy absorption and pedestrian protection device. Collision energy is dispersed and consumed by adopting a rhombus-shaped mechanism and a damping unit; and the rhombus-shaped mechanism is used for transmitting energy in a collision process into a transverse direction so as to reduce the vertical impact force between a pedestrian and a car body. Meanwhile, the deformation of the rhombus-shaped mechanism can provide a certain safe buffering distance for the collision process to prolong the collision contact time and reduce the magnitude of collision force. The energy decomposed by the rhombus-shaped mechanism is transmitted to the damping unit, and the kinetic energy is converted into heat energy through the relative movement of the damping unit; and finally, the collision energy is consumed. Therefore, the collision force can be decomposed, the collision energy is consumed, the collision contact time is prolonged, the stress of people and the car in the collision process is improved, and further, the safety of people and the car is protected to the greatest extent.

The method provided by the invention comprises the following steps: a machine body, a walking part, a lifting part, a reciprocating pounding part and the like are arranged; a pounding guide element and the like are arranged on a pounding guide device; pounding heads are arranged at two ends of the pounding guide element, so that a power pounding element drives the pounding guide element; the reciprocating pounding part is arranged on the lifting part; the lifting part is arranged on the machine body; and the walking part drives the machine body to move ahead and retreats so as not to turn the machine body to excavate and drop materials forward and backward. Equipment provided by the invention comprises the machine body, the walking part, the lifting part, the reciprocating pounding part and the like; the reciprocating pounding part comprises the pounding guide device, the pounding driving device and the like; the pounding heads are both arranged at two ends of the pounding guide element; the pounding driving device comprises the power pounding element and the like; the power pounding element drives the pounding guide element to move in a reciprocating mode; the pounding guide element drives the pounding heads to pound; the reciprocating pounding part is arranged on the lifting part; the lifting part is arranged on the machine body; the walking part drives the machine body to move ahead and retreat so as not to turn the machine body to excavate and drop materials forward and backward.

The invention discloses a personal cleaning and care appliance. The appliance comprises a driver transducer, a drive coil, the drive coil core, drive bracket. Transducer includes a drive shaft, a transducer elastic fixing member disposed about the longitudinal axis of the drive shaft in the left and right sides of the permanent magnet, a permanent magnet fixedly connected permanent magnet bracket, transducer actuator arms and transducers elastic member. Independently of the permanent magnet, the permanent magnet pole side, the other side of the permanent magnet having a magnetic polarity opposite to the example of the permanent magnet facing the driving coil in a direction of the magnetic pole N or S polarity in the direction toward the drive coil electrode of the angle between the direction of the magnetic field lines inside the permanent magnet and the driving coil core longitudinal axis is greater than 45 degrees and less than 135 degrees, the permanent magnet relative to the transducer to move the elastic member fixing member. When the drive frequency of the coil by an alternating current, the direction of movement of the permanent magnet and the driving coil core approximately parallel to the longitudinal axis, the angle between the two is greater than 170 degrees and less than 190 degrees. The appliance has simple structure, low cost, easy assembly, smooth rotation, low noise, low damping and secure.

The product comprises: an outer / inner frame, a drive electrode and a drive feedback electrode both with two group of lateral comb-tooth capacitors and movable electrodes connected to the outer frame, a drive-modal elastic beam, a detection electrode with two group of unequal vertical comb-tooth capacitors for difference detection with movable electrode connected to the inner frame, a detect-modal elastic beam as four group of combined torsion beams everyone with ends connected to former inner / outer frame respectively, and an anchor point fixed on substrate bottom and connected to the outer frame through the drive-modal beam. This invention is simple and fit to large-scale production, compatible to Z-axis gyro and accelerometer, and can be used for MIMU.

The invention relates to a capacitance horizontal axis micro-mechanical tuning fork gyroscope which is characterized by including an underlay, anchor points, a detection folding beam, a framework, a drive folding beam, a detection quality block, a drive comb capacitance and a detection comb capacitance; the drive comb capacitance and the detection comb capacitance respectively include a movable electrode and a fixing electrode; the anchor points, the detection folding beam, the framework, the detection quality block, the drive comb capacitance and the detection comb capacitance are symmetrically arranged relative to the X-axis and the Y-axis of the gyroscope; the movable electrode of the drive comb capacitance is fixedly connected with the detection quality block; the detection quality block is connected with the framework by the drive folding beam; the movable electrode of the detection comb capacitance is connected with the framework; the framework is connected with the anchor points by the detection folding beam; the anchor points are fixedly connected with the underlay; the fixing electrode of the drive comb capacitance and the fixing electrode of the detection comb capacitance are fixedly connected with the underlay by the anchor points of each own. The capacitance horizontal axis micro-mechanical tuning fork gyroscope has a simple technical process, can be compatible with a Z-axis tuning fork gyroscope, can be used for realizing a chip triaxial gyroscope and can realize batch production.

An electric power steering system causing an electric motor 6 to generate a steering assist force according to a steering torque, includes: a torque sensor 3 for detecting the steering torque; phase compensation means 15a, 15b acting when a target control value of the electric motor 6 is generated based on an output from the torque sensor 3; and means 15c for varying the characteristic of the phase compensation means depending upon whether a steering mode is steer with driving or steer without driving, whereby a loadless steering feeling due to phase lag is not encountered during driving even if vibrations during steer without driving are suppressed by a phase compensator.

A micro electric field transducer of static comb excitation differential detection type is prepared as setting positive induction electrode and negative induction electrode under shielding electrode or in the same plane of earthing shielding electrode, carrying out reciprocal and periodical vibration in said plane by shielding electrode under excitation of static comb to periodically shield and expose positive or negative induction electrode in order to let positive or negative induction electrode generate alternative induction current for realizing detection of external electric field.

A vibrating massager includes housing and clamping arms which fasten the device to the user's body. Mechanical vibrations, produced by a small electric motor spinning an eccentrically mounted weight are transmitted to the user via the arms. The device can be worn to target the areas on areas such as the shoulder that are aggravated by repetitive and extended use of a computer keyboard or mouse.

An integrated lead suspension (ILS) has a constrained layer damper (CLD) that attenuates vibration of the ILS. The CLD may be applied over an already assembled ILS such that the CLD is applied to the cover layer, to the base layer, or to both. Alternatively, the ILS may be encapsulated via a deposition process such that a damping layer is sandwiched between the conductor layer and the cover layer of the ILS, between the conductor layer and the dielectric layer of the ILS, or both.

The invention discloses a magneto-rheological hydraulic suspension device which comprises an upper connecting bolt, a synthetic framework, a rubber main spring and a main spring support. The main spring support is fixed on a support, the lower end of the support is connected with a lower connecting bolt, an upper liquid chamber partition plate and a lower liquid chamber partition plate are arranged at the junction of the main spring support and the support, and symmetrical tapered bosses are arranged at the centers of the upper liquid chamber partition plate and the lower liquid chamber partition plate and provided with tapered through holes. A rubber bottom film is clamped between the lower liquid chamber partition plate and the support, a chamber defined by the synthetic framework, the rubber main spring, the main spring support and the upper liquid chamber partition plate is an upper liquid chamber, a chamber defined by the lower liquid chamber partition plate and the rubber bottom film is the lower liquid chamber, a connecting rod is arranged in the upper liquid chamber, one end of the connecting rod is connected onto the synthetic framework, the other end of the connecting rod is connected with main electromagnetic coils, and the main electromagnetic coils are located in the tapered through holes. The magneto-rheological hydraulic suspension device enlarges a damping adjustment range and can isolate vibration and noise of an engine within a wide frequency band and improves the noise reducing performance of the suspension at high frequency.

The invention discloses a bionic hair sensor for being sensitive to flow velocity and accelerated velocity vectors and a detection method thereof; the bionic hair sensor includes a top polymer hair, a middle annular silicon micro-sensor structure, and a bottom signal wire prepared on a glass substrate. When acted by an external accelerated velocity or fluid, the top hair drives a round mass block and an annular mass block in the annular silicon micro-sensor structure to swing; with use of a negative stiffness effect principle of an electrostatic force, and through swinging of the round mass block and the annular mass block in the annular silicon micro-sensor structure, resonant frequencies of resonators arranged around the round mass block and the annular mass block are caused to be changed, and values of the flow velocity and the accelerated velocity are detected; with use of a coupling structure of the mass block and the annular mass block, the swinging direction of the top hair is subjected to vector decomposition, and the vector direction of the accelerated velocity or the fluid velocity is detected.

A series-mechanism adjustable passive negative-stiffness damper comprises a positive stiffness and negative stiffness series mechanism, and a common damper; the positive stiffness and negative stiffness series mechanism includes a positive stiffness unit and a negative stiffness unit; the positive stiffness unit includes a mechanical spring and upper and lower connectors, two ends of the mechanical spring are fixedly connected to the upper and lower connectors respectively, so that it is ensured that the mechanical spring can bear pull reciprocating load; the negative stiffness unit includes an outer frame, two pre-compression springs, a guide rod and a slider, the lower end of the guide rod is fixedly connected to the bottom center of the outer frame, the slider sleeves the guide rod and can slide freely along the guide rod to integrally serially connect a damping unit and the positive stiffness and negative stiffness series mechanism, and it is possible to adjust stiffness without changing damping; the common damper is partially parallelly connected to positive stiffness or negative stiffness through structures, and it is accordingly possible to adjust the stiffness and damping. The series-mechanism adjustable passive negative-stiffness damper can provide improved aseismic effect for civil structures, especially super-large civil structures.

The capacitor MEMS acceleration sensor is one sandwich type differential capacitor structure comprising an upper electrode, a middle electrode and a lower electrode, and the movable middle electrode includes one frame with slots, one mass block with one central hole and one cantilever beam. When the mass block moves up and down, the air inside the cavity may pass through the hole and flow out through the slots, and the enhanced air flow can prevent the mass block from moving freely, resulting low damp and less noise.

The invention discloses a blast tube of a tunnel. The blast tube is characterized in that explosive, supporting rods, a detonator, a detonating tube, a detonating cord, a water bag and a tamping plug are fixedly formed and are assembled in a plastic tube according to a certain sequence so as to form the blast tube of the tunnel; the utilization rate of blast holes is high, so that explosive is saved, the explosive force is strong and the environmental pollution can not be caused; the diameter of the section of the plastic tube is slightly less than the diameter of the blast hole, and the inner diameter of the plastic tube body is more than the diameters of the explosive, the tamping plug and the water bag. The plastic tube is good in flexibility, higher in strength, convenient for transportation, less in dampness when in filling, and is convenient for an operator to put assembled explosive tubes into the blast holes, so that the blast tube is convenient and fast in filling and safe in detonation.

The invention specifically relates to a method for retaining vertical impact of an impacting mechanism and a vertical-lift impact-cutting digger implementing the method, belonging to the field of machinery, especially to the field of mining. The digger comprises a body, the impacting mechanism and a vertical lift mechanism, wherein the impacting mechanism comprises a guiding member and an impacting head, the vertical lift mechanism comprises a vertical lift driving unit, a lifting and moving part, a supporting seat and the like, the lifting and moving part is movably connected with the supporting seat, the supporting seat is connected with the body, the impacting mechanism is arranged on the lifting and moving part, the vertical lift driving unit drives the lifting and moving part to vertically move up and down, and the lifting and moving part drives the impacting mechanism to vertically rise and fall. The digger provided by the invention has the advantages of a long service life, a small amount of maintenance, high work efficiency, shortened body length and applicability to a complex usage occasion.

The invention discloses an ultrasonic receiving transducer based on a Helmholtz resonant cavity. The ultrasonic receiving transducer based on the Helmholtz resonant cavity comprises the Helmholtz resonant cavity and an MEMS piezoelectric ultrasonic transducer which are combined through bonding, wherein the MEMS piezoelectric ultrasonic transducer is composed of a piezoelectric laminated structureand a silicon substrate with a cavity body, the Helmholtz resonant cavity is composed of a silicon structure with a cavity body and an upper opening, the silicon structure is located above the piezoelectric laminated structure, a Helmholtz resonant cavity hole is formed in the upper opening, and air in the Helmholtz resonant cavity hole forms an air column of the Helmholtz resonant cavity; the middle part of the silicon substrate structure with the cavity body and at the bottom is etched to form a bulged silicon substrate strut, an annular groove is etched in the piezoelectric laminated structure around the silicon substrate strut, a plurality of radial grooves are etched in the piezoelectric laminated structure by taking the silicon substrate strut as a center, and the piezoelectric laminated structure is partitioned into a plurality of fan-shaped structures or a plurality of trapezoidal structures; and the plurality of fan-shaped structures or the plurality of trapezoidal structuresform a cantilever beam, one end, making contact with the silicon substrate strut, of the cantilever beam, forms a fixed end, and one end, away from the silicon substrate strut, of the cantilever beam,forms a free end. The performance of the ultrasonic receiving transducer can be improved.

The low temperature airtight packaging method for wafer level micro mechanical device and photoelectric device features that semiconductor material or glass through wet etching or dry etching is airtight bonded at pressure of (1-3)í‡10<-5> Pa and vacuum degree of 10< -3 > Pa by using benzocyclobutene (BCB). The BCB bonded micro mechanical device and photoelectric device may reach air tightness of (2.1í½5.9)í‡10< -4 > Pa cu cm / s He and shear strength over 4.65 MPa. The packaging method of the present invention is suitable for MEMS device, micro acceleration meter, micro gyro, micro heat radiation instrument, etc. and can raise the performance of the packaged device obviously.

The invention relates to a high-energy consumption self-decoupling magnetorheological damper with damping force decoupling property and failure self-protection function. The damper not only has high energy consumption and output, but also can effectively prevent subsidence of magnetorheological fluid, therefore, the invention is suitable for civil engineering structures. The damper mainly comprises a master cylinder body (6), an auxiliary cylinder body (13), a main piston (8), two auxiliary pistons (23), a piston rod (25), and novel composite-structure energy accumulators (14 and 15). Permanent magnets (9) arranged in the main piston (8) and the two auxiliary pistons (23) can effectively prevent subsidence of magnetorheological fluid, and can still provide corresponding damping force under the condition of power supply failure to enhance the safety of the structure. Magnetic circuit guiding components improve the utilization factor of the magnetic field. A mechanical spring self-decoupling device is mainly operated on the condition that the damper is under low-frequency driving, thereby overcoming the disadvantage of low output of the damper under low-frequency driving.

The invention provides a large-travel active adjusting damper of a SMA wire split sleeve. The large-travel active adjusting damper of the SMA wire split sleeve comprises a split sleeve, a super-elasticity SMA wire, a piston, two external bolts, two damping rings and a mounting frame; the inner wall of the split sleeve is a periodic diameter change cylindrical surface, and is complementary with the outer wall of the piston in shape; two ends of the piston are connected with the external bolts for connecting the damper with other parts; two sides of the piston are respectively provided with one damping ring; and the super-elasticity SMA wire is uniformly wound on the insulation outer wall surface of the split sleeve. The large-travel active adjusting damper of the SMA wire split sleeve fuses the material damping of a super-elasticity memory alloy, the dry friction damping and the damping ring damping to improve the vibration reducing performance, uses the structure of the periodic friction surface to enable once travel of the damper to include multiple loading and unloading processes of the super-elasticity SMA wire to effectively increase the vibration amplitude borne by the damper, can realize self-adaption rigidity and damping adjusting functions through control of the SMA wire, prevents the failure problem of a sealing piece, and is long in service life, wide in application range and high in reliability.

The invention relates to a symmetric structure doublestage decoupling single crystal silicon micro mechanic gyroscope that includes glass base sheet, silicon sheet and the structure etched on the silicon sheet. The structure includes mass block, comb type driver and comb type detector. The fixed electrode is connected to bonding area. And the active electrode is connected to the frame. The detecting decoupling beam is set between the driving frame and the mass block. Flexible beam is set between the two ends of the frame. The invention could gain high quality gene under air environment and make the micro mechanic gyroscope have high sensitivity.

The invention relates to an automatic control variable damping oil-gas suspension cylinder, and belongs to the field of off-highway mining dumping trucks. A cylinder barrel is provided with an upper oil hole and a lower oil hole, the upper oil hole is communicated with piston upper hydraulic oil, the lower oil hole is communicated with an internal buffering cavity, the upper oil hole and the lower oil hole are connected through an externally-arranged oil channel, and an adjustable throttling hole and a solenoid valve are arranged on the externally-arranged oil channel. The externally-arranged oil channel, the adjustable throttling hole and the solenoid valve define an external buffering cavity in the traveling range of a piston rod, the solenoid valve is connected with a pressure switch, and the pressure switch is connected with high-pressure nitrogen inside the suspension cylinder. According to the automatic control variable damping oil-gas suspension cylinder, the external buffering cavity is controlled to be opened and closed under different working conditions through the pressure switch, the changes of the damping of the suspension cylinder under different working conditions are achieved, and thus optimal traveling smoothness and handling stability can be achieved.

Apparatus and methods for detecting subsurface tunnels employ an aboveground air pressure sensor and one or more subsurface air pressure sensors. The output of the aboveground sensor forms the input to a numerical model whose input parameters account for the effects of depth and permeability and porosity of the earth on the propagation of pressure variations from the surface to the location of each subsurface sensor. Tunnels are detected on the basis of a growing deviation between measured and modeled subsurface pressures using static model input parameters, or on the basis of changes in the model input parameters required to continue accurately approximating measured subsurface pressures, or on the basis of spatially anomalous values of the model input parameters corresponding to multiple horizontally separated subsurface sensors.

An apparatus for controlling sound within a vehicle includes an acoustical damping device operable to determine a measured sound. The acoustical damping device is operable to output a noise canceling signal to a vehicle audio system to dampen the measured sound. A sound controller is operably coupled to the acoustical damping device and is configured to automatically receive an environment signal from an environment sensor. The sound controller is configured to determine an operating mode of the vehicle based on the environment signal. The operating mode is selectable from an operating mode list that includes a stress operating mode and a calm operating mode. The sound controller is configured to cause alteration of the noise canceling signal and reduction in damping in the stress operating mode with respect to the calm operating mode.

The invention discloses a microgravity testing device based on a quartz flexible accelerometer. The microgravity testing device comprises a quartz flexible accelerometer assembly, a sampling circuit, a filter circuit, a gating circuit, an analog / digital (A / D) conversion circuit, a communication interface circuit and a field programmable gate array (FPGA) controller. The quartz flexible accelerometer assembly comprises the quartz flexible accelerometer and a temperature control system which comprises a temperature control circuit, a heating element, a heat preservation cover, an installation base body and a base. The microgravity testing device based on the quartz flexible accelerometer has the advantages of being low in noise, large in range, wide in transmission band, and capable of avoiding data loss caused by frame dropping, frame emptying, frame repetition, error codes and the like, and improving reliability of data.

The invention provides a controllable damping molecule spring vehicle suspension. The controllable damping molecule spring vehicle suspension comprises a compressible hydraulic cylinder, an incompressible auxiliary cylinder, a piston, molecular spring mixed mediums and a magnetorheological fluid; the compressible hydraulic cylinder comprises an end cap and a cylinder body which are mutually connected, a membrane sheet is arranged at the position between the end cap and the cylinder body, and a cavity formed between the membrane sheet and the cylinder body is fully filled with the molecular spring mixed mediums; the incompressible auxiliary cylinder comprises an auxiliary cylinder body, and the auxiliary cylinder body is arranged at the end, away from the cylinder body, of the end cap in asleeving mode; a first sealing ring is arranged between the inner wall of the auxiliary cylinder body and the outer wall of the end cap to form a sealed chamber, and the chamber is fully filled with the magnetorheological fluid; the piston comprises main pistons and an auxiliary piston, wherein the main pistons and the auxiliary piston are mutually connected, the main pistons are located in the end cap and the auxiliary cylinder body and sequentially penetrate through the end cap and the auxiliary cylinder body to extend to the exterior of the auxiliary cylinder body; and the auxiliary pistonis located in the cavity formed between the membrane sheet and the cylinder body. According to the controllable damping molecule spring vehicle suspension, the structure is simple, performance is superior, and ride comfort and the control ability of a vehicle can be effectively improved.

The invention discloses a combined shock-insulation support of a high-rise building. The support comprises an upper connecting plate, a lower connecting plate, a base plate, standard laminated rubber shock-insulation support bodies, a moving lever, a fixed lever, rubber pads, a limiting plate, tensile adjusting bolts, a returning positioning pin, a positioning ball, a positioning ball support, a limiting and positioning column and a resisting arm. According to the support, problems that the shock-insulation support is inadequate in tensile strength, poor in shock-insulation effect and weak in wind load resistance in the high-rise building are solved; problems that the excessively large displacement can be produced by low damping and the low damping can not overcome the wind load are solved; and the influence of the earthquake force is used, the instability of the positioning ball is exerted, and a shock-insulation self-starting device is designed, so that the support is simple, practical and reliable in performance.