31results about How to "Shorten vibration time" patented technology

Provided are a motor driving method, a program therefor, and a motor driving apparatus which can shorten starting time of a vibration wave motor. A driving circuit of the vibration wave motor includes a control unit. The control unit controls two-phase driving voltages applied to an electro-mechanical energy conversion element of the vibration wave motor. The control unit controls a phase difference between the two-phase driving voltages to drive a driven member at a predetermined speed in a fixed state of frequencies of the two-phase driving voltages. In this case, when the phase difference is set outside a predetermined range, the control unit changes the frequencies of the two-phase driving voltages.

The invention relates to an in-plane-control-based active vibration control method for a wrinkled film. On the basis of the analysis on the influence on dynamic characteristics of a film structure bya wrinkle form, a dynamic model of a wrinkled film is established; according to a modal superposition method, a space vector based on a natural mode of vibration is obtained and dynamic models of thewrinkled film under different loads are established; condensation polymerization is carried out on the dynamic models according to contributions to system vibration deformation by all orders of modes,so that a control-oriented film structural dynamic model is established; and with a model reference adaptive controller, a PID-MRAC control method based on in-plane-control multi-model switching is proposed. According to the method provided by the invention, no actuator needs to be pasted on the surface of the film; the out-of-plane vibration of the film is suppressed effectively; the characteristics of the film are not affected; the high stability of the film structure is ensured; and compared with the conventional PID control method, the in-plane-control-based active vibration control method enables the vibration time to be shortened by about 39.7%.

The invention belongs to the field related to additive manufacturing and discloses a powder distribution device and an additive manufacturing device. The powder distribution device comprises a powder spreading platform and hoppers arranged above two sides of the powder spreading platform, powder materials are placed in the hoppers, powder-material placing locations are arranged on the two sides of the powder spreading platform, the powder materials are transferred to the powder-material placing locations through the hoppers, scrapers vertically arranged above the powder spreading platform are allowed to move along the horizontal direction as well as the vertical direction, and the scrapers are respectively located on one sides of the powder-material placing locations when moving along the vertical direction. The powder distribution device is provided with the scrapers allowed to move along the horizontal direction as well as the vertical direction, two-way powder scraping is realized, thickness of powder layers is evener as compared with the existing one-way powder scraping, and powder spreading efficiency is improved. Further more, the scrapers are vertically arranged, so that two-way powder scraping can be better realized, and waste of the powder materials is avoided.

The invention discloses a damping material, a preparation method thereof and a piezoelectric ceramic ultrasonic probe. The damping material comprises the following components in parts by weight: 60-120 parts of high-molecular polymer, 30-60 parts of inorganic fillers with sheet structure, 5-15 parts of inorganic fillers with ball structure, 0.5-5 parts of silane auxiliaries and 10-30 parts of solvents. The damping material provided by the invention can effectively prevent the long curing time and insufficient conduction caused by the increase of tungsten powder content as well as the interference to the ultrasonic signal caused by the middle layer formed by bonding the damping block with the piezoelectric ceramic wafer of the present damping material; the curing time is stable, the material is non-conducting and the damping coefficient is higher; a filling method is applied to the piezoelectric ceramic ultrasonic probe, so that the vibration damping of the piezoelectric ceramic wafer is greatly increased; the vibration time of the piezoelectric ceramic wafer is shortened; the absorption of the piezoelectric ceramic wafer for the echo signal is benefited; the definition of ultrasonic testing for multilayer gluing structure defect is increased.

The invention provides a multi-split conductor deicing and overturning prevention device which comprises a spacer, a swing rod and a balancing weight. The spacer is clamped on the multi-split conductor bundle and is provided with a central shaft; the upper end of the swing rod enters the spacer and is hinged with the central shaft of the spacer, and the lower end of the swing rod is connected withthe balancing weight, so that the problems of static twisting and torsional vibration of the multi-split conductor caused by uneven ice coating and asynchronous deicing of the sub-conductors are solved, the vibration time is shortened, the vibration can be stopped quickly, and the damage to the sub-conductors, the sub-conductor spacer and the inter-phase spacer is avoided. The multi-split conductor deicing and overturning prevention device has simple structure, the deicing and overturning phenomena of the multi-split conductor can be well prevented and treated, and the condition that the sub-conductors and the spacer are damaged due to deicing and overturning of the multi-split conductor is avoided; and the multi-split conductor deicing and overturning prevention device is convenient to install, high in reliability, adjustable in rigidity of the spring, weight of the balancing weight and distance between the upper edge of the balancing weight and the lower edge of the middle frame ofthe spacer, and wide in range of application.

The invention discloses a damping system for a forward gantry of an electric forward forklift, which comprises an oil tank connected with an oil inlet pipe and an oil return pipe, wherein the oil inlet pipe and the oil return pipe are both connected to a multi-way control valve which is externally connected with a forward cylinder, a gear pump is in external transmission connection with an electric motor and is arranged inside the oil inlet pipe, a two-position four-way solenoid valve is arranged inside a connecting pipeline between the multi-way control valve and the forward cylinder, a travel switch in control connection with the two-position four-way solenoid valve is arranged outside a piston rod of the forward cylinder, and when the two-position four-way solenoid valve is powered on, the two interfaces of the two-position four-way solenoid valve are communicated with each other. The problems of poor stacking safety and long storage time caused by the long-time vibration of the gantry of the electric forward forklift in the forward stacking operation process are solved. According to the damping system disclosed by the invention, the gantry can be quickly stabilized from vibration so that the amplitude of vibration can be quickly attenuated in an integrated mechanical-electrical-hydraulic manner on the basis of not influencing on the normal forward stacking operation of the electric forward forklift, so that the safety and storage efficiency of the forklift are greatly improved.

The invention provides a concrete brick forming machine good in synchronism and low in noise. The synchronous brick forming machine comprises a synchronous pressing head mechanism used for achieving synchronous brick pressing, a concrete brick mold frame arranged below the synchronous pressing head mechanism, a vibration transmission connecting piece connected to the lower end of the concrete brick mold frame and used for directly transmitting vibration force to the concrete brick mold frame, a vibration mechanism fixedly arranged on the vibration transmission connecting piece and used for providing a vibration source, a concrete brick supporting plate arranged at the bottom of the concrete brick mold frame, a vibration reduction and knocking supporting mechanism arranged below the concrete brick supporting plate and used for supporting the concrete brick supporting plate and a lifting mechanism used for driving the concrete brick mold frame and the vibration transmission connecting piece to move up and down together. The concrete brick forming machine has the advantages that synchronism and the brick making effect are good; the filler vibration compaction effect is good, the quality of formed concrete bricks can be guaranteed, and the product percent of pass can be increased; the whole machine is low in working noise and beneficial to protecting the health of workers; and theforming speed is high, and high-efficiency and high-yield production can be realized.

The invention discloses an automatic feeding device and control method for buzzer dispensing. The device comprises a vibration conveying device and a dispensing positioning device. The vibration conveying device comprises a vibration plate, a first feeding guide rail, a second feeding guide rail and a direct vibration device. A first positioning convex strip and a second reflective photoelectric sensor are arranged on the side, in the direction opposite to the conveying direction of the second feeding guide rail, on a dispensing platform. A push mechanism is arranged at the end, in the direction perpendicular to the conveying direction of the second feeding guide rail, on the dispensing platform, and a second positioning convex strip and a first reflective photoelectric sensor are arrangedat the other end of the dispensing platform. By the adoption of the automatic feeding device for buzzer dispensing, whether the number of workpieces in the second feeding guide rail reaches the fullcapacity or not is judged according to a signal of an opposite-type optical fiber sensor, and the vibration disc is controlled to stop vibrating. When the number of workpieces in the second feeding guide rail reaches the set lower limit value, the vibrating plate is started, so that the continuity of the feeding is ensured, the vibration time of the vibrating plate is shortened, the energy is saved, the starting and stopping frequency of the vibrating plate is reduced, and the service life of the vibrating plate is prolonged.

The invention discloses a balance control device for spray boom arms of a high-ground-clearance boom sprayer. The balance control device comprises: supports; supporting shafts, which are respectivelyarranged on the supports; a driving motor, which is used for driving the supporting shafts to rotate; cable recycling wheels and coil spring assemblies, which are respectively arranged on the supporting shafts; and circumferential limiting pieces, which are fixedly arranged on the supports and can circumferentially limit one ends of the coil spring assemblies, so the coil spring assemblies can berotated and tightened. According to the invention, cables are wound on the cable recycling wheels, and when the tail ends of the spray boom arms move downwards, the cables are pulled out, and the coilspring assemblies are gradually tightened to generate a force for preventing the spray boom arms from moving downwards; and when the tail ends of the spray boom arms move upwards, the driving motor drives the supporting shafts to rotate, and the cables are wound around the cable recycling wheels again. The balance control device provided by the invention can reduce the vibration frequency and vibration time of the spray boom arms, so the spray boom arms can be restored to a balance position as soon as possible; and the influence of vibration of a vehicle body on a pesticide application effectis reduced.

The invention discloses a compressor vibration damping method and system and an electrical appliance product including the system and relates to the technical field of compressor vibration damping. The compressor vibration damping method is characterized in that a compressor is connected to a vibrating device used for driving the compressor to vibrate, and includes the steps of judging whether ornot resonance between the compressor and an external device occurs; if yes, controlling the vibration frequency of the vibrating device to be maintained beyond a preset frequency range in order to enable the compressor and the external device to stay in a non-resonance state, wherein the preset frequency range is a running frequency range of the compressor to cause resonance of the external device. In this way, by adding vibration of the vibrating device to prevent resonance between the compressor and the external device, the problem that a big noise is generated during resonance is solved, and the problem of damage of the compressor and external device due to resonance is also solved.

The invention relates to a variable-frequency vibration forming process for carbon electrodes and is applicable to vertical vibration forming of electrodes with diameters ranging from phi 800mm to phi 1400mm. The variable-frequency vibration forming process includes four stages including mold entering vibration, lower-frequency transformation, lower-frequency high pressure and high-frequency high pressure. Vibration time, compared with the prior art, is shortened by 5 to 8 minutes, green-pressing volume density of the processed electrode is improved from 1.68 g/cm<3> to 1.70g/cm<3>-1.72g/cm<3>, no internal quality defects and no breakage accidents are caused in use,, and producing efficiency and product quality are improved.

The invention relates to an active adjusting system for a vehicle attitude and a vehicle. The active adjusting system for the vehicle attitude comprises a connecting rod mechanism which is co-definedby a first connecting rod, a first crank, a first rocking bar and a frame; the movement track of the first end of the first connecting rod is approximately a straight line. When the wheels bump up anddown in the vertical direction, the wheels drive an axle to move up and down, the axle drives the first end to move vertically, and the position of the frame is not changed. The active adjusting system for the vehicle attitude absorbs part of kinetic energy through the connecting rod mechanism, so that stability of the vehicle is improved. The active adjusting system for the vehicle attitude controls the rotation angle of the first crank through a first motor, so that a rotation angle of the first connecting rod and a rotation angle of the first rocking bar are controlled to reduce vibrationtime of the frame, and therefore, damping performance of the vehicle is improved, and stability of the vehicle is improved. Besides, the active adjusting system for the vehicle attitude further can adjust the vehicle attitude through the first motor, and improves comfort and safety.

The invention provides an anti-seismic support acting on installation of a high-floor rainwater drainage pipe, and relates to the technical field of drainage pipe seismic resistance. The support comprises a fixing assembly; a mounting mechanism is mounted at the top of the fixing assembly, a driving part is mounted in the mounting mechanism, two groups of connecting devices are mounted inside the mounting mechanism, and a clamping mechanism is mounted at the tops of the two groups of connecting devices; the number of pushing parts is two, and the two pushing parts are installed at the top of the fixing assembly; and triggering devices are installed on the outer sides of the two groups of connecting devices. When the drainage pipe vibrates, the vibration time of the drainage pipe can be shortened while damping is conducted, the situation that the drainage pipe is damaged due to long-time vibration is avoided, and the service life of the drainage pipe is prolonged; and the problem that the drainage pipe is prone to being damaged due to long-time vibration is solved.

The invention discloses a four-shaft united excitation vibration power device. The four-shaft united excitation vibration power device comprises a box body; a first main shaft, a first driven shaft, asecond driven shaft and a second main shaft are sequentially installed in the box body side by side; a first driving gear and a second driving gear are installed on the first main shaft and the second main shaft correspondingly; a first driven gear engaged with the first driving gear and a second driven gear engaged with the second driving gear are installed on the first driven shaft and the second driven shaft correspondingly; the first main shaft and the second main shaft penetrate through the box body and are connected with a driving device; first eccentric blocks are installed on the first main shaft; and second eccentric blocks are installed on the second main shaft. According to the four-shaft united excitation vibration power device, the driving device drives the first eccentric blocks and the second eccentric blocks installed at the two ends of the first main shaft and the second main shaft to rotate to generate vibration; due to the fact that the first main shaft, the secondmain shaft, the first driven shaft and the second driven shaft are installed side by side, the contact area with a vibration table is increased, the needed vibration time is shortened, the amplitude is reduced, and the needed excitation vibration force is convenient to adjust due to the design of the eccentric blocks at the two ends.

The invention discloses an environment-friendly aviation skin damper, and relates to the technical field of aviation. The environment-friendly aviation skin damper comprises a steel plate, and the upper side surface of the steel plate is fixedly connected with a damping reinforcing patch. According to the environment-friendly aviation skin damper, the bending vibration strength of a metal component is weakened through the damping reinforcing patches, and when the metal component is bent and vibrates, vibration energy is rapidly transmitted to the damping reinforcing patches coated on the metal component, so that internal friction and mutual dislocation of the damping reinforcing patches are caused, then most of the vibration energy is changed into heat energy to be consumed, the noise energy radiated by bent vibration is reduced, meanwhile, the damping reinforcing patches can further shorten the excited vibration time of the metal component, equivalently, the total energy of noise radiated by the metal component is reduced, and therefore the problems of fatigue damage of aircraft structures and failure of electronic equipment due to the fact that multi-peak resonance of naval vessels, aircraft structures and electronic equipment thereof is frequently excited due to the fact that broadband vibration sources generated in the using process of existing aircrafts are too large are solved.

The invention relates to mask processing, in particular to a traditional Chinese medicine mask preparation technology and a traditional Chinese medicine mask. The traditional Chinese medicine mask preparation technology comprises the following steps that Step 1, traditional Chinese medicine raw materials are ground and screened to obtain powder; Step 2, the powder is mixed with a liquid raw material to obtain paste; Step 3, the paste is added into a mask packaging bag, and the paste is hot-pressed in one area of the mask packaging bag; Step 4, a moisturizing stock solution is added into the mask packaging bag, and the moisturizing stock solution is hot-pressed into the other two areas of the mask packaging bag; compared with a facial mask towel, the paste mask can be used for flexibly wet-compressing the part to be wet-compressed.