30results about How to "Reduce vibration coupling" patented technology

The invention discloses a pantograph active control method based on state feedback accuracy linearization. The method comprises the following steps of (1) constructing a ternary bow net coupling dynamics model; (2) carrying out state feedback linearization; (3) calculating a linear equation and acquiring a transfer function; and (4) carrying out zero pole configuration. In the invention, active control is performed on a pantograph so that a coupling vibration condition among bow nets is reduced, generation of abnormal conditions of an off line state, arc burning and pantograph slide plate wear and the like caused by a violent fluctuation of contact pressure among the bow nets is alleviated and safe operation of a train is guaranteed.

The invention relates to a surface mount type I-shaped four-footed linear ultrasonic motor vibrator, belonging to the technical field of piezoelectric ultrasonic motors. The surface mount type I-shaped four-footed linear ultrasonic motor vibrator provided by the invention eliminates various adverse impacts caused by coupling bending vibration in the traditional rectangular four-footed linear ultrasonic motor vibrator. Two end faces of a vertical beam of the vibrator are respectively provided with an amplitude transformer, binding site of the two amplitude transformers is a big end face of the amplitude transformer, the two end faces of a horizontal beam are respectively provided with one amplitude transformer, the binging site of the two amplitude transformers is the big end face of the amplitude transformer, the vertical beam is respectively fixedly connected with middle position of inner side walls of the two horizontal beams by virtue of small end faces of the two amplitude transformers of the two end faces of the vertical beam; the outer side wall, the upper side wall and the lower side wall of each horizontal beam are respectively provided with one piezoelectric ceramic wafer, one piezoelectric ceramic wafer is respectively arranged at the two sides of the amplitude transformer on the inner side wall of each horizontal beam, the upper side wall and the lower side wall of the vertical beam are respectively provided with one piezoelectric ceramic wafer, and the inner side wall and the outer side wall of the vertical beam are symmetrically provided with two piezoelectric ceramic wafers at the two sides of a thin walled beam. The surface mount type I-shaped four-footed linear ultrasonic motor vibrator provided by the invention can be applied to the field of manufacturing of ultrasonic motors.

The invention discloses a middle-speed magnetic levitation vehicle walking mechanism with six suspension modules. On the basis of an existing middle-speed magnetic levitation vehicle walking mechanismwith five suspension modules, another suspension module is added, and therefore the running speed of a maglev train can be increased to a high and middle speed range. The maximum applicable speed ofthe walking mechanism is not lower than 180 km / h, and the application market of current middle-low speed maglev trains is expanded. Each suspended rack adopts a pair of bag-type large air springs distributed on the left and right sides of the middle part of the suspended rack, the dynamic effect between the suspended racks and a circuit is small, the coupling vibration of train tracks can be remarkably reduced, and the suspension stability of the maglev trains is improved. Optimal design is conducted on power units, suspension units and the suspended racks of the suspension modules, the walking mechanism is simplified, and more convenience is provided for daily use and maintenance.

The invention provides a plate-type damping suspender and relates to the field of bridges. The plate-type damping suspender comprises a hanger plate and a wind resistance device which are mounted on the hanger plate, and the wind resistance device comprises a fixed plate, a rain diversion edge and a rotation component; the fixed plate is fixed mounted on the hanger plate, the rain diversion edge is mounted on the fixed plate, and the rain diversion edge changes wind field to have rain water diverted so as to reduce wind-induced vibration of the suspender; the rotation component comprises a rotation shaft, a first rotating piece and a second rotating piece; the rotation shaft is connected with the fixed plate, the first rotating piece and the second rotating piece are respectively fixedly mounted on the rotation shaft and can rotate around the rotation shaft respectively to break the even wind field, and meanwhile, the wind-induced vibration of the suspender can be further lowered through rotational energy consumption of the suspender. The plate-type damping suspender is ingenious in structural design, the wind-induced vibration can be lowered through change of the wind field and rotational energy consumption of the suspender, wind resistance is good, and high reliability is achieved; by the arrangement, wind and rain resonance can be effectively prevented, and stability of the suspender is improved.

The invention discloses a hex-blade conical ball milling cutter used for machining an impeller deep hole. The hex-blade conical ball milling cutter is composed of a cutter handle (1), a cutter pole (2) and cutting edges (3) disposed at the front end of the cutter pole (2). The hex-blade conical ball milling is characterized in that diameter of the cutter is within the range of 8-16mm, six cutting edges are disposed on the cutter; length of each cutting edge is 15-80mm, valid length of each cutter head is 20-60mm; the cutter handle (1) of the cutter is of a conical-handle structure, conical degree is between 1.5 DEG C and 6.5 DEG C; and cutting line speed Vc of the cutter is 60-200m / min. By means of the hex-blade conical ball milling cutter, efficiency and quality of deep hole machining are improved. As the machining efficiency and machining quality are improved, work time of equipment is reduced, depreciation of equipment is reduced, and labor cost is reduced.

The invention relates to the technical field of electronic materials, in particular to a boron-containing spiro compound and an organic electroluminescent device. The boron-containing spiro compound provided by the invention has a structure as shown in a formula I. The boron-containing spiro compound provided by the invention effectively improves the aggregation-induced fluorescence quenching effect caused by a rigid plane structure of a boron-nitrogen condensed ring and the defect that the half-peak width is increased due to aggregation, and reduces the half-peak width, so that in the process of increasing the doping ratio, the light-emitting property and the color purity of the device are not reduced but are improved to a certain extent.

The invention discloses a sensor assembly for a Coriolis mass flowmeter. The flowmeter includes an upstream pipeline connector used for being connected to an upstream fluid pipeline and a downstream pipeline connector used for being connected to a downstream fluid pipeline. The axis of the upstream pipeline connector and the axis of the downstream pipeline connector are positioned on one central axis; the sensor assembly is arranged in a shell of the flowmeter and comprises a vibration part and a non-vibration part which are separated by a vibration isolation structure; the vibration isolationstructure at least includes a first vibration isolation piece which divides the fluid flow pipe into a vibration pipeline and a non-vibration pipeline, and the first vibration isolation piece is close to a central axis. By arranging the first vibration isolation piece close to the central axis, the distance between the first vibration isolation piece and the upstream and downstream pipeline connectors is short; if vibration leaks from the vibration part, correspondingly the distance between an exciting force formed on a vibration isolation sheet and an upstream and downstream junction is short, and the flowmeter cannot rotate because of eccentricity of the exciting force.

The invention discloses a sensor assembly for a Coriolis mass flowmeter. The flowmeter includes an upstream pipeline connector used for being connected to an upstream fluid pipeline and a downstream pipeline connector used for being connected to a downstream fluid pipeline. The axis of the upstream pipeline connector and the axis of the downstream pipeline connector are positioned on one central axis; the sensor assembly is arranged in a shell of the flowmeter and comprises a vibration part and a non-vibration part which are separated by a vibration isolation structure, and the gravity centerof the sensor assembly is basically positioned on the central axis. By positioning the gravity center of the sensor assembly basically on the central axis, when vibration leakage happens at the vibration part, since the gravity center of the sensor assembly is as close as possible to the central axis of the upstream and downstream pipeline connectors or is positioned on the central axis of the upstream and downstream pipeline connectors, the rotation radius of a sensor about the axis of an upstream and downstream junction is decreased. Therefore, no matter what causes vibration leakage of thevibration part of the sensor, vibration of the non-vibration part of the whole sensor is unlikely to happen, and the stability of the flowmeter is improved.

The invention discloses an active control device for propeller shaft transverse vibration. The active control deice comprises a stern bearing, a middle bearing and a thrust bearing which are sequentially distributed in an axial direction of a propeller shaft, and further comprises an electromagnetic bearing assembly, wherein one end, close to the stern bearing, of the propeller shaft is connectedto counterweight, and the other end of the propeller shaft is connected to a motor; the electromagnetic bearing assembly comprises an electromagnetic bearing, a displacement sensor, a controller and apower amplifier, wherein the electromagnetic bearing is arranged on the propeller shaft; the displacement sensor is mounted on the electromagnetic bearing; the displacement sensor is connected to thecontroller; and the power amplifier is separately connected to the controller and the electromagnetic bearing. The active control device can reduce load of the stern bearing or the middle bearing, sothat bearing friction force is reduced or eliminated.

The invention discloses a quartz crystal oscillator cutting method. The cutting method comprises the following steps: acquiring a chip shaft of a quartz crystal rod; based on the chip shaft, measuringthe angle of a crystal bar, and fixing an angle according to the measured angle; cutting the crystal bar in an AT cutting mode according to the fixed angle; and subjecting the large square sheet obtained through cutting in the AT cutting mode to axial reverse cutting with the Z axis as the long edge, and completing cutting of the quartz crystal bar. According to the method, the size of the Z-axisis changed by the Z-elongated (the long edge is the Z-axis), so that the surface shear vibration vibrating along the Z-axis is weakened, resonance generated by the surface shear vibration and the thickness shear vibration is inhibited, the TC (temperature characteristic curve) performance of a product at different temperatures is improved, and a large amount of coupling vibration is reduced.

The invention belongs to the technical field of underwater sound, and particularly relates to a reflection type underwater sound metasurface design method for realizing underwater sound regulation and control. On the basis of acoustic surface impedance boundary conditions, an underwater acoustic metasurface unit for realizing theoretical acoustic surface impedance is designed by adopting a topological optimization mode, and the limitation of vibration coupling of the underwater acoustic metasurface unit is introduced into a topological optimization framework, so that the coupling of solid vibration of the metasurface is very effectively reduced, and the effectiveness of underwater acoustic metasurface design is ensured; therefore, the regulation and control of the underwater reflection sound field are realized. According to the design mode provided by the invention, artificial participation is not needed, customization as required can be realized, the replaceability of the underwater acoustic metasurface unit is high, the designed underwater acoustic metasurface regulation and control mode is flexible, a new scheme is provided for the design of the underwater acoustic metasurface, the practical application of the underwater acoustic metasurface in various fine and complex underwater sound field control can be promoted; the invention has important application value in the engineering fields of seabed resource exploration, acoustic particle manipulation, medical holographic imaging and the like.

The invention discloses a Coriolis mass flowmeter and a sensor assembly thereof. The flowmeter includes an upstream pipeline connector used for being connected to an upstream fluid pipeline and a downstream pipeline connector used for being connected with a downstream fluid pipeline. The sensor assembly comprises a fluid flow pipe, a first vibration isolation piece and a connection structure; thefluid flow pipe is provided with a fluid input pipeline, a fluid output pipeline and a double loop pipeline connected between the input pipeline and the output pipeline in series; the first vibrationisolation piece is arranged on the double loop pipeline to divide the double loop pipeline into a vibration pipeline and a non-vibration pipeline; one end of the connection structure is fixedly connected to the double loop pipeline, and the other end of the connection structure is fixedly connected to the upstream pipeline connector and / or the downstream pipeline connector to enable the non-vibration pipeline to be flexibly connected with the upstream pipeline connector and / or the downstream pipeline connector correspondingly.

The rocker mechanism is used to control the shooting angle of the camera. One end of rod one is connected to the frame and the other end is connected to one end of rod two. The other end of rod two is connected to one end of rod three, and the other end of rod three is connected to one end of rod four. , the other end of rod four is connected to the frame, one end of rod eight is connected to the frame, the other end is connected to the first sliding sleeve, the first sliding sleeve is set on rod six, one end of rod nine is connected to the frame and the other end is connected to the frame One end is connected to one end of rod ten, the other end of rod ten is connected to one end of rod eleven, the other end of rod eleven is connected to the second sliding sleeve, the second sliding sleeve is set on the moving arm, and one end of the rotating shaft is fixed to the inner ring of the bearing For installation, the outer ring of the bearing is fixed on the boom, and the other end of the rotating shaft is connected to the actuator; Installed in the helical groove of the cylinder, one end of the force application rod is connected to the actuator, the other end of the force application rod is connected to the slider, and the slider is embedded in the rail groove of the ring rail plate.

The invention relates to a multi-dimensional vibration simulation device based on structural coupling. The multi-dimensional vibration simulation device comprises an upper platform, a simulation connecting piece and a lower platform; the lower platform is fixedly mounted on a mounting table board of a one-dimensional vibration table; the upper platform and the lower platform are in rigid connection through the simulation connecting piece; and a tested load is fixedly installed on the upper platform. Different modal frequencies and vibration modes of the upper platform can be constructed by adopting different forms of simulation connecting pieces, structural coupling in different directions is generated with one-dimensional vibration of the one-dimensional vibration table, three-dimensionalsimulation vibration meeting the requirement is constructed, and the measurement requirement of a three-dimensional test is met; a mechanical vibration isolation environment can be constructed through different simulation connecting pieces, coupling vibration in the non-main-vibration direction is reduced, the flexibility of a vibration test is greatly improved, and the test efficiency is improved.

The invention relates to a mass flowmeter. The mass flowmeter comprises two metering tubes, a vibration exciter and two detectors, the metering tubes are arranged in parallel and are identical in structure, each metering tube is symmetrically U-shaped around a longitudinal center and is provided with two straight tube sections, a middle straight tube section and arced tube sections, two ends of each middle straight tube section are vertically connected with the corresponding straight tube sections, the arched tube sections are used for smooth connection with the corresponding straight tube sections and middle straight tube section, the vibration exciter is arranged at the centers of the middle straight tube sections, a coil and a magnetic steel of the vibration exciter are positioned on different metering tubes respectively, the detectors are symmetrically arranged on two sides of the vibration exciter, and a coil and a magnetic steel of each detector are arranged on different metering tubes respectively. When fluid flows through the two metering tubes at identical mass flow, the vibration exciter vibrates the two metering tubes to trigger the Coriolis effect, and the detectors detect vibration signals so as to obtain the mass flow of the fluid. The mass flowmeter has the advantages of high sensitivity, low-pressure loss, easiness in processing and matching and the like.

The invention relates to a double-axis solar panel driving control method, which comprises the following steps of: calculating an orbit illumination condition, namely an included angle beta between an orbit system sun vector So and an orbit surface, through an attitude and orbit control system according to a time module and an orbit determination module; according to the feedback SADA rotation angle and the solar vector of the system measured by the satellite platform, calculating the included angle between the normal of the sailboard and the solar vector of the system in real time; different control mode states of the sailboard driving mechanism are determined according to the solar vector of the orbital system and the included angle beta of the orbital plane; and performing control instruction distribution on each axis of the double-axis SADA according to each refined control mode. According to the method, on the basis of ensuring on-satellite energy when the SADA controls the sailboard to face the sun, vibration coupling caused by double-shaft rotation in an existing design can be reduced as much as possible, and satellite attitude stability is ensured; secondly, the load working loss time and the working attitude stability are reduced, and the effective working life of the satellite is guaranteed; in addition, on-satellite shunting pressure and heat dissipation pressure can be reduced.

The invention relates to a surface mount type I-shaped four-footed linear ultrasonic motor vibrator, belonging to the technical field of piezoelectric ultrasonic motors. The surface mount type I-shaped four-footed linear ultrasonic motor vibrator provided by the invention eliminates various adverse impacts caused by coupling bending vibration in the traditional rectangular four-footed linear ultrasonic motor vibrator. Two end faces of a vertical beam of the vibrator are respectively provided with an amplitude transformer, binding site of the two amplitude transformers is a big end face of the amplitude transformer, the two end faces of a horizontal beam are respectively provided with one amplitude transformer, the binging site of the two amplitude transformers is the big end face of the amplitude transformer, the vertical beam is respectively fixedly connected with middle position of inner side walls of the two horizontal beams by virtue of small end faces of the two amplitude transformers of the two end faces of the vertical beam; the outer side wall, the upper side wall and the lower side wall of each horizontal beam are respectively provided with one piezoelectric ceramic wafer, one piezoelectric ceramic wafer is respectively arranged at the two sides of the amplitude transformer on the inner side wall of each horizontal beam, the upper side wall and the lower side wall of the vertical beam are respectively provided with one piezoelectric ceramic wafer, and the inner side wall and the outer side wall of the vertical beam are symmetrically provided with two piezoelectric ceramic wafers at the two sides of a thin walled beam. The surface mount type I-shaped four-footed linear ultrasonic motor vibrator provided by the invention can be applied to the field of manufacturing of ultrasonic motors.

The invention discloses a pantograph active control method based on state feedback accurate linearization, and the invention includes the following steps: (1) constructing a ternary pantograph-catenary coupling dynamics model; (2) state feedback linearization; (3) Find the linear equation to get the transfer function; (4) Zero-pole configuration. The invention actively controls the pantograph to reduce the coupling vibration between the pantograph and catenary, alleviates the occurrence of abnormal situations such as off-line, arcing and pantograph sliding plate wear caused by the violent fluctuation of the contact pressure between the pantograph and catenary, and ensures that the train safe operation.

The invention discloses a hex-blade conical ball milling cutter used for machining an impeller deep hole. The hex-blade conical ball milling cutter is composed of a cutter handle (1), a cutter pole (2) and cutting edges (3) disposed at the front end of the cutter pole (2). The hex-blade conical ball milling is characterized in that diameter of the cutter is within the range of 8-16mm, six cutting edges are disposed on the cutter; length of each cutting edge is 15-80mm, valid length of each cutter head is 20-60mm; the cutter handle (1) of the cutter is of a conical-handle structure, conical degree is between 1.5 DEG C and 6.5 DEG C; and cutting line speed Vc of the cutter is 60-200m / min. By means of the hex-blade conical ball milling cutter, efficiency and quality of deep hole machining are improved. As the machining efficiency and machining quality are improved, work time of equipment is reduced, depreciation of equipment is reduced, and labor cost is reduced.

A measuring device for determining a fluid variable includes a control device, a measuring tube and a first vibration transducer arranged at the measuring tube. The first vibration transducer containsa vibration element. The vibration element has a vibration body, a first electrode on the measuring tube side and a second electrode averted from the measuring tube. The first electrode extends overa first end face of the vibration body. The second electrode extends to a second end face that lies opposite the first end face. A respective conductive contact element contacts the first electrode ata first end face and the second electrode at a second end face electrically and mechanically such that the vibration element is supported by the contact elements. A voltage between the first and second electrodes can be varied through the vibration element to excite a guided wave in a side wall of the measuring tube.

The invention discloses a Coriolis mass flowmeter and a sensor assembly thereof. The sensor assembly comprises a fluid flow pipe, a vibration isolation structure and a weight addition structure; the fluid flow pipe is provided with a fluid input pipeline, a fluid output pipeline and a double loop pipeline connected between the input pipeline and the output pipeline in series; the vibration isolation structure is arranged on the double loop pipeline to divide the double loop pipeline into a vibration pipeline and a non-vibration pipeline; the weight addition structure is arranged on the non-vibration pipeline, and the weight addition structure and the non-vibration pipeline are not in contact with a shell. According to the Coriolis mass flowmeter and the sensor assembly thereof, the gravitycenter of the sensor assembly is adjusted by arranging the weight addition structure on the non-vibration pipeline, so that the vibration state is improved, and the vibration coupling between the non-vibration pipeline and the vibration pipeline is reduced. Moreover, the weight addition structure and the non-vibration pipeline are not in contact with the flowmeter shell, so that a non-vibration part of the sensor assembly is not rigidly connected with the flowmeter shell, the vibration isolation effect is improved, and the flowmeter obtains a stable zero point and achieves excellent meteringperformance conveniently.

The invention discloses a three-freedom degree controllable mechanism type mobile mechanical arm. A tenth revolute pair and a ninth revolute pair are arranged on an operation platform of the mobile mechanical arm; a fourth connecting rod is triangular; the lower end of a first driving component is connected to a turning table; the upper end of the first driving component is connected with a first connecting rod; the other end of the first connecting rod is connected with one end of a second connecting rod; the other end of the second connecting rod is connected with the operation platform; the lower end of a big arm is connected to the turning table; the upper end of the big arm is connected with a first end of the fourth connecting rod; the lower end of a third connecting rod is connected to the turning table; the upper end of the third connecting rod is connected with a second end of the fourth connecting rod; one end of a fifth connecting rod is connected with a third end of the fourth connecting rod; the other end of the fifth connecting rod is connected with the operation platform; the lower end of a second driving component is connected to the turning table; the upper end of the second driving component is connected with one end of a sixth connecting rod; the other end of the sixth connecting rod is connected to the big arm. According to the three-freedom degree controllable mechanism type mobile mechanical arm provided by the invention, rotational inertia and vibration coupling in a movement process of the mechanical arm are reduced, and the bearing capacity of the mechanical arm is improved.

A ceramic embedded I-shaped four-foot linear ultrasonic motor vibrator belongs to the technical field of piezoelectric ultrasonic motors, eliminating various adverse effects caused by the coupled lateral vibration of the conventional rectangular four-foot linear ultrasonic motor vibrator. A piezoelectric ceramic sheet of the ceramic embedded I-shaped four-foot linear ultrasonic motor vibrator is excited by two-phase alternating voltage signals of which the amplitude values are equal, the frequencies are the resonance frequency of the vibrator and the phase difference is plus 90 degrees; piezoelectric ceramic sheets on a horizontal metal beam and a vertical metal beam of the ceramic embedded I-shaped four-foot linear ultrasonic motor vibrator are excited by two-phase voltage respectively; two vibrating modes are excited in the vibrator through the telescopic vibration of the piezoelectric ceramic sheet; the two vibrating modes are superposed on four terminals of the horizontal metal beam, namely generating an elliptic movement track by particles on the surfaces of four driving feet; and when the four driving feet contact rotors on two sides of the four driving feet under a certain prepressure, a macroscopic movement output can be realized by frictional coupling between the driving feet and the rotors. The ceramic embedded I-shaped four-foot linear ultrasonic motor vibrator is applicable to manufacturing of a ultrasonic motor.

A vibration damping seat and a vibration damping method for an aircraft are disclosed. The vibration damping seat can comprise a base and a seat basin, the bottom of the seat basin is supported by the base, the seat basin is provided with a cushion opposite to the bottom, the seat basin comprises an active vibration damping device installed between the bottom of the seat basin and the cushion, the active vibration damping device comprises a servo control air pump and an air cylinder, the air cylinder is provided with a piston plate which is used for sealing gas in the air cylinder and can move in the air cylinder, the piston plate is connected with the cushion through a telescopic rod, and the servo control air pump inflates the air cylinder when detecting vibration. The seat vibration damping method for the aircraft is also disclosed.

The invention discloses a secondary vibration feedback control device for a Coriolis mass flow meter. The device comprises two coils, two columnar steel magnets and a Coriolis twisting control circuit, wherein the two coils and columnar steel magnets are arranged on the Coriolis mass flow meter; the Coriolis twisting control circuit is used for acquiring voltage signals from two velocity sensors;a current signal leading to a moment coil is generated through an input / output signal conditioning circuit, an A / D or D / A conversion circuit and a singlechip so as to enable the two coils to generatea magnetic field; and the two columnar steel magnets generates a moment opposite to a secondary vibration twisting moment of the Coriolis mass flow meter under the action of the magnetic field so as to counteract the secondary vibration twisting moment of the Coriolis mass flow meter. The device can acquire the magnitude of flow rate by detecting the amplitude of the control signal, greatly expand the range of the Coriolis mass flow meter and reduce the coupled vibration of the Coriolis mass flow meter.

The invention relates to a small-sized electronic element double-deck shock absorber based on a flat spring. The shock absorber comprises the flat spring, a middle mass block, at least one secondary spring and a mounting plate for mounting a to-be-damped element, wherein the mounting plate is positioned above the flat spring; a through hole for providing shape change space for the secondary spring is formed in the flat spring; one end of the secondary spring is mounted on the lower end face of the mounting plate; the middle mass block is mounted on the lower side face of the flat spring; the other end of the secondary spring penetrates through the through hole in the flat spring to be connected with the middle mass block. The small-sized electronic element double-deck shock absorber based on a flat spring realizes the double-deck effect in a single shock absorber and has the advantages of being small in size, low in centroid and effectively reducing vibrational coupling in the height direction.