43results about How to "Small damping" patented technology

The invention discloses a device and a method for a low-speed wind tunnel gust or flutter half-mode test, belongs to the field of wind tunnel tests, and aims to solve the problems that an existing gust or flutter half-mode test device cannot realize complete release of heaving and pitching degrees of freedom and is difficult to share the two tests. The device comprises an overall frame, the overall frame is installed in a wind tunnel test section, two sliding rails are vertically arranged on the front end face of the overall frame, two sliding block sets are arranged on the left side and the right side of the rear end face of a tackle, the two sliding block sets are in sliding fit with the two sliding rails in a one-to-one correspondence mode, two spring seats are arranged at the top end of the overall frame, and horizontal shafts are arranged on the spring seats. The inner ring ends of the two clockwork springs are connected with the horizontal shafts of the two spring seats in a one-to-one correspondence manner, the outer ring ends of the two clockwork springs respectively droop to be connected with the pulley, and the model mounting seat is cylindrical and is in running fit with the pulley; the device can be used for a gust load retarding test and a body degree of freedom flutter test, and can be shared by the two tests.

The invention discloses a driving assembly, a wafer carrying device and a wafer carrying method, and relates to the technical field of semiconductors, the driving assembly at least comprises a driving integration part, the driving integration part comprises a plurality of direct drive motors arranged in parallel, and the driving integration part has a plurality of transmission level heights; wherein one of the direct-drive motors of the drive integration part drives the first arm to rotate around the elbow rotation center of the second arm, and the other direct-drive motors drive the at least two end effectors to relatively rotate around the wrist rotation center of the first arm at different heights. The driving device is used for driving the tail end driver in the wafer carrying process, the driving assembly is used for providing driving force in the wafer carrying process, and the driving assembly at least solves the technical problem that the occupied space is large due to longitudinal overlapping of motors; the wafer carrying device is used for carrying wafers, and at least solves the technical problems that the rotation angle of an end effector is limited and the wafer conveying rhythm efficiency is low.

The invention discloses a transformer fault diagnosis method based on an adaptive fault attention residual network, and the method comprises the steps: employing an MEMS photoacoustic sensor with a capacitor resonator, analyzing a sound wave signal through a photoacoustic spectrum and a signal processing technology, collecting soluble gas in oil, and forming a parameter sequence; introducing an adaptive activation function and a fault index function; the feature distribution of a source domain and a target domain is adjusted by using an LMMD and a domain discriminator, the data of the source domain and the data of the target domain are from different distributions but share the same label space, and the edge distribution difference of the features and conditions is minimized through the LMMD and the domain discriminator to realize cross-domain invariant feature learning; the performance of the model is optimized by balancing hyper-parameters, and the loss meaning in all aspects is balanced to realize dynamic balance. The method can be effectively applied to the fault diagnosis of the transformer, and the diagnosis accuracy is greatly improved.

The invention discloses an immersive cinema dynamic content adaptation control method based on multi-modal fusion, and the method comprises the steps: collecting at least one non-contact physiological signal of a target audience seat area in real time, the physiological signal comprising a respiratory wave signal collected by a millimeter wave radar or a photoplethysmography signal collected by a near-infrared photoelectric sensor; performing time-frequency analysis on the physiological signal, and extracting a physiological wake-up characterization value in a current time window; the physiological wake-up characterization value comprises a heart rate variability change rate and a heart rate deviation value; constructing a dynamic damping adjustment model, and calculating a virtual damping coefficient of the seat movement system at the current moment based on the physiological wake-up characterization value; and the virtual damping coefficient is converted into an execution instruction of a seat motion controller, and damping force output of the motion platform is adjusted in real time. The technical problem that the pre-programmed motion feedback is disjointed with the real-time physiological and psychological state of the audience can be solved, the experience adaptability and comfort of the cinema seat are improved, and the system safety is improved.

The invention provides a photoelectric sensing inertial sensor and a manufacturing method thereof, and the sensor comprises a semiconductor substrate which is internally provided with an annular cavity; a light conduction device is arranged in a circle defined by the annular cavity and is used for transmitting light to the inner side wall of the circumference of the annular cavity along the radius; the light source is used for emitting light rays vertically emitted to the circumferential plane of the annular cavity; a modulation device is arranged in a vertical projection area of the light source to the plane where the light conduction device is located and used for modulating a light source beam to the radius direction of the annular cavity; the light receiving devices are uniformly arranged on the circumferential side wall of the outer side of the annular cavity; and the inertial body is located in the annular cavity and can rotate around the annular cavity, and when the inertial body rotates to the position of a certain light receiving device, the inertial body can shield the light receiving device to receive light beams. According to the invention, the miniaturization of the sensing device is realized, the manufacturing cost is greatly reduced, the comprehensive damping is small, the test error is low, and the impact resistance is higher.

The invention relates to a gas injector for blowing in gaseous fuel, comprising: a magnetic actuator (2) having an armature (20), an inner pole (21) and a coil (22); a closing element (3) having a valve needle (30) and an armature bolt (23), the valve needle (30) releasing and closing a gas path (14) on a sealing seat (11) arranged at a first end of the gas injector, the armature (20) being connected to the armature bolt (23) and the armature bolt (23) being operatively connected to the valve needle (30); a closed lubricant chamber (4), which is filled with a lubricant and in which the armature (20) and the armature bolt (23) are arranged, the lubricant providing a lubricating action in the lubricant chamber (4); a restoring element (10) which resets the closing element (3) into a closed starting position, in which the lubricant chamber (4) is filled with a gas and a liquid lubricant for damping during the movement of the closing element (3), and in which the volume ratio of the liquid to the gas is in the range of 70% / 30 to 95% / 5%.

The utility model discloses a contact of a vacuum arc-extinguishing chamber, which belongs to the technical field of power transmission and transformation, and comprises cams, a plurality of cams are arranged in a ring sleeve, the cams surround the contact, the contact is arranged in the ring sleeve, the contact and the ring sleeve are coaxial, sliding sleeves are arranged on the cams in a sliding manner, a plurality of sliding sleeves are abutted against the outer wall of the contact, and the sliding sleeves are arranged on the outer wall of the contact. An anti-skid rubber pad is arranged on the face, making contact with the contact, of the sliding sleeve, and the bottom of the ring sleeve is in threaded connection with a bottom plate. The adjusting assembly is used for adjusting the relative height of the sliding sleeve on the cam; the positioning assembly is used for limiting the contact; according to the utility model, impurities can be effectively prevented from influencing the discharge stability of the contact.

The invention discloses a vibrating diaphragm assembly, a sound production device and electronic equipment. The vibrating diaphragm assembly comprises a ball top portion located at the center position and a folding ring portion arranged on the outer side of the ball top portion in the circumferential direction, the ball top portion and the folding ring portion are integrally formed in a foaming mode through the same base material, the thickness of the folding ring portion is smaller than or equal to that of the ball top portion, and the thickness of the folding ring portion is larger than that of the ball top portion. And the maximum foaming ratio of the folding ring part is smaller than that of the ball top part. According to the vibrating diaphragm assembly, the ball top part and the folding ring part are integrally foamed and formed by adopting the same base material, so that the connection strength of the ball top part and the folding ring part is remarkably improved, and a boundary line of combination of soft and hard materials existing in bonding connection of the folding ring part and the ball top part is prevented; therefore, the ball top part and the folding ring part are prevented from being peeled off in the large-amplitude vibration process, the reliability margin of the large-amplitude vibration of the vibrating diaphragm assembly is improved, the high-frequency vibration consistency is good, and the high-frequency curve is smooth.

The invention discloses a long-span, large-load-bearing, descaling, water-cooled furnace roller, comprising a roller shaft, a conical transition body and a furnace roller, the inner wall of the furnace roller being rotatably contacted and connected with a spiral strut, a load-bearing roller being fixed at the central axis position of the spiral strut, an axis cavity being provided at the central axis position of the load-bearing roller, a rotating groove being provided on the cavity wall of the axis cavity, a support frame being slidably provided in the rotating groove, a water-dividing, load-bearing transmission rod being fixed at the axis center of the support frame, the water-dividing, load-bearing transmission rod passing through the roller shaft at the water outlet end side of the long-span, large-load-bearing, descaling, water-cooling furnace roller of the invention being exposed to the outside, graphite thrust rings being fixed at both ends of the inner wall of the furnace roller, the spiral strut being in sliding contact with the graphite thrust ring, the invention has the characteristics of long span, large load-bearing, descaling, high heat dissipation efficiency, no deformation, no nodule, saving cooling water, reducing energy loss of high-temperature furnace, good economy, energy saving and environmental protection, and prolonging the service life of the product.

There is provided a method of enhancing a feature signal by synthesizing a complex frequency wave, comprising: obtaining a real frequency response based on a measurement of a spectroscopic signal; selecting a complex frequency so that the complex frequency can at least partially compensate spectral line broadening caused by loss; a complex frequency response is obtained based on a plurality of real frequency responses and the complex frequency to enhance the feature signal.

This invention discloses a highly sensitive detection device and method for immersion-type ultrasonic signal detection in liquids. The invention provides a circular diaphragm with concentric corrugations and a center-thinned structure, and uses this diaphragm as a reflective surface of an optical interference cavity to construct a highly sensitive detection device for immersion-type ultrasonic signal detection in liquids. The diaphragm, used to sense ultrasonic signals, has identical concentric corrugations and a center-thinned structure on both sides, enabling the diaphragm to achieve higher mechanical sensitivity without significantly reducing its natural frequency. The concentric corrugations effectively release initial residual stress introduced during processing and packaging, reducing surface warping and baseline drift. Simultaneously, a replaceable acoustic membrane is constructed in front of the diaphragm, achieving high sound transmission and anti-contamination under long-term immersion in liquid conditions. This detection device can be directly placed in the liquid for detection, improving the sensitivity of ultrasonic signal detection while maintaining a wide frequency range, preventing contamination of the detection element, and ensuring the long-term stability of the detection device.

The utility model belongs to the technical field of underwater vehicles, and particularly relates to a telescopic underwater vehicle which comprises a front cabin and a rear cabin, a vehicle connecting plate is fixedly installed on the right side of the front cabin, the rear cabin is installed on the right side of the vehicle connecting plate in a telescopic mode, and a gravity center transferring assembly is arranged in the rear cabin. The left side of the rear cabin is tightly attached to the right side of the aircraft connecting plate, four storage grooves distributed in an annular array mode are formed in the aircraft connecting plate, and take-off assemblies are arranged in the storage grooves. In the utility model, the servo motor is used for controlling the rotation of the adjusting screw rod to adjust the position of the balancing weight, so that the gravity center is changed, the underwater vehicle spans a medium in a posture perpendicular to the water surface, the damping when the underwater vehicle spans the medium is reduced, the loss of required energy is reduced, and amphibious sea and air is realized; uncertain factors influencing stable navigation of the underwater vehicle in an underwater environment are overcome, so that the underwater vehicle has stable water-air navigation and reliable cross-medium capability.

This invention discloses a method and apparatus for determining the optimal position of the shaft damping controller in a grid-type doubly-fed induction generator (DFIG). A damping controller based on rotational speed signals is added to different control loops. The differences in shaft damping caused by adding the damping controller to different control loops are compared based on the root locus diagram of the DFIG. Results show that implementing the damping controller in the active power loop reduces transmission system damping compared to the voltage loop. Furthermore, applying the damping controller to the q-axis voltage provides a better damping enhancement effect than applying it to the d-axis voltage.

The utility model discloses a motorcycle front magnetorheological damper and motorcycle, including working cylinder, guider assembly, piston assembly, floating piston assembly, magnetorheological fluid, outer tube support assembly, ECU control unit and sensor, guider assembly, piston assembly and floating piston assembly are located in the inside of working cylinder, and piston assembly includes built -in solenoid and damping passage, and damping passage penetrates the upper and lower end of piston assembly, and magnetorheological fluid fills the working cavity between guider assembly and floating piston assembly, and, outer tube support assembly is at least partially coated in the outside of working cylinder, and is connected with guider assembly, and ECU control unit and solenoid electric connection are used for the signal adjustment input to solenoid's current according to sensor, like this through solenoid and the combination of magnetorheological fluid, ECU control unit can real -time regulation magnetic field intensity, change the viscosity of magnetorheological fluid to dynamic control damping force.

The utility model provides a pressure cooker structure capable of switching cooking modes, a stirring piece, a warping plate piece and a sliding piece are further arranged on a cooker cover, the stirring piece is rotatably connected to the cooker cover, the stirring piece is connected with a knob piece which is held by a hand to push the stirring piece to rotate, and the middle of the warping plate piece is rotatably connected to the cooker cover. The front portion of the warping plate piece is located below the shifting piece, the rear portion of the warping plate piece is located below the exhaust valve block, and the bottom of the shifting piece is provided with a jacking part which can press down the front portion of the warping plate piece in the rotating process of the shifting piece so that the rear portion of the warping plate piece can lift the exhaust valve block upwards. The cooker body is provided with a proximity sensor used for sensing the sliding piece, the proximity sensor is electrically connected with the control module, and a linkage structure capable of pushing the sliding piece to be close to or away from the proximity sensor in the rotating process of the stirring piece is arranged between the stirring piece and the sliding piece. The pressure cooker structure capable of switching the cooking modes is more convenient and safer to operate.

The present invention relates to a rotary kiln, and in particular to a rotary kiln with adjustable speed and adjustable inclination angle, comprising a rotary kiln assembly, wherein the rotary kiln assembly comprises a kiln, a gas distribution cabinet, a discharge collection box, a lifting platform and a base, wherein the gas distribution cabinet is arranged on the base, and the discharge collection box is arranged on one side of the base. The present invention facilitates the adjustment of the inclination angle of the kiln through the cooperation of a driving member and a mandrel, and facilitates limiting the speed of the expansion and contraction of the piston rod and the mandrel of the driving member through the cooperation of an inclined wedge telescopic member, a bidirectional damping rod and an adjusting rod, so that the inclination angle of the kiln can be adjusted while limiting the speed of adjusting the inclination angle of the kiln. Only a small damping is required to limit the speed of the piston rod of the driving member, and the bidirectional damping rod at the edge can be removed, thereby achieving the effect of reducing the damping, thereby increasing the speed of the driving member adjusting the angle of the kiln.

This invention relates to the field of grid converter control technology, and more particularly to an adaptive hybrid synchronization control method for a grid converter, comprising an active power outer loop controller, a hybrid synchronization control link, and an adaptive link; the system control angular frequency in the active power outer loop controller serves as the system control angular frequency input to the adaptive link; the adaptive angular frequency adjustment output by the hybrid synchronization control link is connected to the active power outer loop angular frequency of the active power outer loop controller; and the adaptive link outputs the hybrid synchronization adaptive gain of the hybrid synchronization control link. This invention can adaptively adjust the equivalent damping of the system according to the system state, ensuring a sufficiently fast power step response during normal system operation, and providing sufficient equivalent damping to ensure transient stability when the system enters a fault state.

The utility model discloses an asymmetrical damping tensioning wheel with a combined damping piece structure, which is characterized by comprising a body, a spring, a combined damping piece and a support plate, a support plate limit structure is arranged on the support plate, the body is rotatably connected with the support plate, the spring is arranged between the body and the support plate, and the combined damping piece is arranged on the body. A combined damping part is further arranged between the body and the supporting plate, the outer side of the combined damping part is attached to the inner wall of the body, the two ends of the spring make contact with the body and the combined damping part respectively, the combined damping part is arranged on the supporting plate, and when the body and the supporting plate rotate relatively, the combined damping part moves along with the supporting plate. The spring and the combined damping piece generate damping between the body and the supporting plate. The tensioning wheel achieves large damping in the loading process and small damping in the unloading process, damping has asymmetry, and belt shaking can be effectively restrained.

The utility model discloses a wave compensation hydraulic system which comprises a piston type energy accumulator, a low-pressure gas cylinder, a high-pressure gas cylinder, a three-cavity oil cylinder, an oil supplementing pump and an oil tank. The low-pressure gas cylinder and the high-pressure gas cylinder are respectively connected with a gas cavity of the piston type energy accumulator, and the oil supplementing pump is connected with the oil tank; the piston type energy accumulator is provided with a first displacement sensor used for monitoring the displacement change of a piston, and the three-cavity oil cylinder is provided with a second displacement sensor used for monitoring the displacement change of a piston rod. The three-cavity oil cylinder comprises a driven cavity, a rod cavity and a rod inner hole cavity, the driven cavity is communicated with a liquid cavity of the piston type energy accumulator, the rod cavity and the rod inner hole cavity are respectively communicated with the oil tank, and the rod cavity and the rod inner hole cavity are respectively connected with the oil supplementing pump. Under the conditions of different sea conditions and load changes, the compensation capacity of the wave compensation hydraulic system can be adjusted in real time, and the output force of the piston rod is kept stable.

The application discloses a reef limestone underground chamber damping system and belongs to the field of damping devices. The reef limestone underground chamber damping system comprises an elastic bearing assembly, micro-grouting hole pipelines, composite variable resistors and pressure sensors. The elastic bearing assembly comprises basalt micro-tendon and stainless steel energy dissipation nodes. A plurality of basalt micro-tendons form a constraint network along the circumference and axis of the chamber on the inner wall of the chamber. The stainless steel energy dissipation nodes are arranged at the intersection connection between the basalt micro-tendons. A plurality of micro-grouting hole pipelines are arranged in the constraint network along the axis of the chamber. The pressure sensors are embedded in the rock above the chamber. A plurality of composite variable resistors are arranged at the arch foot of the chamber. The three-stage collaborative mechanism of "basalt micro-tendon constraint-SMA-MRF collaborative energy dissipation-SMA heating phase change recovery and micro-grouting" solves the adaptability bottleneck of traditional anti-seismic technology in reef limestone underground space, and improves the anti-seismic performance and long-term service reliability.

The utility model discloses an automatic reset electric control operating handle, which relates to the field of electronic controllers, and comprises a mounting plate, a handle controller and a fixing pipe, and the mounting plate is mounted on the handle controller; the lower end of the fixing pipe penetrates through an opening in the mounting plate and is fixedly connected with a control rod on the upper side of the handle controller, a grip is arranged at the upper end of the fixing pipe, and a control button is arranged on the grip; a sliding sleeve is slidably arranged on the surface of the fixing pipe. The device has the beneficial effects that when the fixed pipe is pushed through the grip, the fixed pipe drives the control rod to drive the handle controller, so that inclination of a machine and the fixed pipe is controlled to enable the circular plate to incline along with the machine, meanwhile, the circular plate pushes the sliding sleeve upwards, the sliding sleeve and the threaded sleeve are matched to compress the spring, and after a driver loosens the grip, the spring pushes the sliding sleeve downwards, so that the sliding sleeve and the circular plate are reset; therefore, automatic reset of the fixing pipe is achieved, manual misoperation is avoided, the fixing pipe returns to the middle vertical position, simplification of the operation handle is achieved, and blind operation of operators is facilitated.

The invention relates to the technical field of ruggedized computers, in particular to a variable-rigidity variable-damping self-adaptive vibration reduction device and method.The variable-rigidity variable-damping self-adaptive vibration reduction device comprises a mounting bottom plate and a rack bottom plate, vibration reducer shells are mounted at the four corners of the mounting bottom plate, and the rack bottom plate is fixed to the upper portions of the vibration reducer shells; a motor unit is arranged on one side of the mounting bottom plate, a management unit is arranged on the rack bottom plate, and acceleration sensors are arranged on the two sides of the rack bottom plate; a shock absorber assembly is arranged in the shock absorber shell, the motor unit comprises a plurality of motors, gears are arranged at the tail ends of rotating shafts of the motors, and the gears and the shock absorber assembly jointly form a space gear mechanism. Compared with the prior art, in the low-frequency stage, the damping assembly can automatically increase damping to reduce the response of a resonance point; in the high-frequency stage, the rigidity of the vibration reduction assembly is gradually increased, so that the whole machine has proper rigidity, and proper self response is ensured; and if the response cannot meet the required value, the damping reduction response is automatically reduced or increased.

This invention relates to the field of suspension system technology for engineering vehicles, and discloses a hydropneumatic suspension system and a tracked engineering vehicle, including a front suspension cylinder, a middle suspension cylinder, a rear suspension cylinder, a front swing arm, a middle swing arm, a rear swing arm, a buffer cylinder, a tensioning cylinder, a brake arm, and an eccentric shaft; one end of each of the front, middle, and rear suspension cylinders is hinged to the vehicle frame, and the other end is hinged to the front, middle, and rear swing arms, respectively; a tensioning cylinder cylinder seat is fixedly connected to the rear of the cylinder barrel of the tensioning cylinder, and the cylinder barrel of the buffer cylinder is placed inside the tensioning cylinder cylinder seat, allowing it to swing within the tensioning cylinder cylinder seat; the piston rod end of the buffer cylinder is hinged to the brake arm; the piston rod end of the tensioning cylinder is hinged to the vehicle frame. The beneficial effects of this invention are: it can significantly attenuate the vibration generated during high-speed operation, improve the overall comfort of the vehicle, and ensure that the tracks are tensioned in real time during high-speed operation, preventing slippage and derailment, thus guaranteeing the vehicle's mobility and passability.

The invention discloses an open type all-position multi-layer rotation stroke amplification mechanism, and relates to the field of field pipeline welding. Comprising an input layer, 0 to a plurality of derived intermediate layers, an intermediate layer and an output layer which are arranged in sequence; the device is formed by connecting a plurality of rotary layers in series, the rotary layers are provided with overlapped notches at the initial phase, and the device can be mounted or dismounted on a to-be-welded pipeline when the notches are overlapped; the stroke of each layer is symmetrical relative to the initial phase and is gradually amplified along with the increase of the number of layers, the sum of the positive stroke and the negative stroke can reach more than 360 degrees after the stroke is subjected to multi-stage rotation amplification, and a plane welding table can be driven to complete a pipeline girth welding task; the open-type all-position multi-layer rotation stroke amplification mechanism is compact in structure, high in precision, capable of using a high-rigidity and low-damping guide rail and suitable for field pipeline girth welding tasks with high welding quality requirements in a narrow space.

The invention provides a shock absorber and a bottom valve thereof so as to change the damping characteristic of the shock absorber during high-speed movement, so that the shock absorption effect of the shock absorber at the high-speed stage is improved, the running comfort of a vehicle is improved, and relates to the technical field of automobile shock absorption. According to the shock absorber bottom valve, an oil inlet throttling channel and an oil outlet throttling channel are formed in a valve body, an oil inlet one-way valve assembly and an oil outlet one-way valve assembly are arranged on the valve body, and a first elastic piece for controlling the opening pressure of the oil inlet one-way valve assembly is arranged on the oil inlet one-way valve assembly; a second elastic piece for controlling the opening pressure of the oil outlet one-way valve assembly is arranged on the oil outlet one-way valve assembly, an auxiliary oil outlet throttling channel is further arranged in the valve body, an auxiliary oil outlet one-way valve assembly matched with the auxiliary oil outlet throttling channel in a sealing mode is further arranged on the valve body, and an auxiliary oil outlet one-way valve assembly for controlling the opening pressure of the auxiliary oil outlet one-way valve assembly is arranged on the auxiliary oil outlet one-way valve assembly. The opening pressure of the third elastic piece is larger than that of the oil outlet one-way valve assembly.

The present invention discloses a micromechanical gyroscope using piezoresistive / piezoelectric detection, comprising one or more lever coupling detection mechanisms, a driving capacitor, a detection mass block, an external decoupling mechanism, an internal decoupling mechanism and a rhombus coupling mechanism, wherein the lever coupling detection mechanism is connected to the external decoupling mechanism, the external decoupling mechanism is connected to the detection mass block, the detection mass block is connected to the internal decoupling mechanism, adjacent internal decoupling mechanisms are connected via a rhombus coupling mechanism, and each mechanism and the driving capacitor are fixed via respective anchor points. The use of piezoresistive / piezoelectric detection is beneficial to reducing the volume of the gyroscope and improving the accuracy; the use of the lever coupling detection mechanism and the rhombus coupling mechanism improves the adaptability of the gyroscope to the mechanical environment; the piezoresistive / piezoelectric detection beam is connected to the lever to improve the sensitivity of the gyroscope; the two ends of the lever are connected to the detection mass block via an external decoupling mechanism, which is beneficial to improving the sensitivity and accuracy of the gyroscope.

The utility model provides a kind of scooter steering damping structure and scooter, it is related to scooter technical field.The utility model provides the steering damping structure of scooter, including and the head tube of body connection, the vertical pipe of rotatablely being arranged in head tube, friction plate, compression component, connecting piece, elastic member and adjusting mechanism;Friction plate is arranged between the inner wall of head tube and the outer wall of vertical pipe, compression component is arranged on the outside of head tube, alternatively, part of compression component is located outside head tube, another part is from the outside of head tube and into the inside of head tube;Friction plate and compression component are connected together along the radial direction of head tube by connecting piece, elastic member is arranged between compression component and head tube, adjusting mechanism is arranged on the outside of head tube;The adjusting end of adjusting mechanism is abutted to compression component, to adjust the compression degree of elastic member by adjusting mechanism.The utility model provides a kind of scooter steering damping structure and scooter, can reduce the dither of steering system, improve the safety of riding.

The invention relates to a bulk acoustic wave device (100) comprising a first electrode (1a) and a second electrode (2a) and a piezoelectric element (3a) arranged between the first electrode and the second electrode, the piezoelectric element being designed such that a first electromagnetic signal fed into the first electrode is converted into an acoustic signal in the piezoelectric element, the acoustic signal is inverted in the second electrode into a second electromagnetic signal. The piezoelectric element comprises at least two piezoelectric layers (31, 33) having polarity in the same direction and at least one intermediate layer (32a) between the at least two piezoelectric layers. The acoustic layer thickness of the piezoelectric layer and the acoustic layer thickness of the intermediate layer are respectively equivalent to odd times of the semi-acoustic wave length of an acoustic signal to be transmitted.

The application provides a kind of gearbox oil temperature control system, control method and wind turbine unit, gearbox oil temperature control system includes temperature sensor, heater, controller, temperature sensor is set to gear box, the temperature measuring part of temperature sensor is located in gear box, temperature sensor is used to detect the lubricating oil temperature in gear box;Heater is set to gear box, heater is used to heat gear box;Controller is used to control heater to heat gear box according to the oil temperature detected by temperature sensor.The gearbox oil temperature control system of the application detects the lubricating oil temperature in gear box in real time through temperature sensor, the controller can control heater to heat gear box according to the oil temperature detected by temperature sensor, realize the accurate regulation and control of lubricating oil temperature, effectively reduce the damping generated by viscosity increase of lubricating oil in low temperature environment, improve the starting performance and working reliability of gear box in low temperature working condition.