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

The invention relates to a sandwich I-shaped four-footed linear ultrasonic motor vibrator, belonging to the technical field of piezoelectric ultrasonic motors. The sandwich 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. The sandwich I-shaped four-footed linear ultrasonic motor vibrator comprises two horizontal compound beams and one vertical compound beam, wherein the two horizontal compound beams and the vertical compound beam are arranged in an I shape, piezoelectric ceramic wafers on the horizontal compound beam and the vertical compound beam are respectively excited by adopting two-phase voltage, stretching vibration of the piezoelectric ceramic wafers is used for exciting two vibration modes during vibration, the two vibration modes are superposed onto four driving feet, namely terminals of four horizontal amplitude transformers, surface material points of the driving feet generate an elliptic motion trail, and when the four driving feet and an active cell at the two sides of the four driving feet are contacted under certain pre-pressure, macroscopic motion output of the active cell is realized by virtue of friction coupling between the driving feet and the active cell. The sandwich I-shaped four-footed linear ultrasonic motor vibrator provided by the invention is applicable to manufacturing of ultrasonic motors.

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 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 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 planing and milling wheel controlling mechanism for a planing and milling machine. One end of a rod 1 is connected to a rack; the other end of the rod 1 is connected with one end of a rod 2; the other end of the rod 2 is connected with one end of a rod 3 through an axial mobile pair; the other end of the rod 3 is connected to an actuator; one end of a rod 4 is connected to the rack while the other end of the rod 4 is connected with one end of a rod 5 through an axial mobile pair; the other end of the rod 5 is connected to a sliding bush; the sliding bush is mounted at one end of a rod 6 in a sleeving manner; the other end of the rod 6 is connected with one end of a rod 7 through an axial mobile pair; the other end of the rod 7 is connected to the actuator; one end of a rod 9 is connected to the rack while the other end of the rod 9 is connected with one end of a rod 10 through an axial mobile pair; the other end of the rod 10 is connected with one end of a rod 11; one end of a rod 13 is connected to the rack while the other end of the rod 13 is connected with one end of a rod 14 through an axial mobile pair; the other end of the rod 14 is connected to a sliding block; one end of a shaft rod is connected to the rod 10 through an axial mobile pair 21 while the other end of the shaft rod is connected to the rod 14 through an axial mobile pair 22.

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.

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 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 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 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.