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.

The present disclosure relates to a downhole electrical energy generating device (105) and a method for transforming energy from a fluid flow (107) passing the device (105), including: at least one vibrating assembly (250) influenced by the fluid flow (107) to oscillate, the vibrating assembly (250) including an elongated body (206) having a longitudinal axis being arranged non-parallel with the fluid flow (107), a stiff body (205) connecting the elongated body (206) to a portion of the device located downstream of said elongated body (206); at least one energy harvester (203) influenced by the vibrating assembly (250), wherein the energy generating device (105) is provided with means (204) for influencing the oscillation frequency of the vibrating assembly (250).

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 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 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 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 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 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 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.

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.