45results about How to "Large vibration amplitude" patented technology

A piezo-electric actuator is provided which is capable of providing large vibration amplitude, is adjustable for resonance frequency, and has high reliability while avoiding an increase in outer dimensions. A piezo-electric actuator comprising: piezo-electric element la having piezo-electric body 3 a which is provided with at least two opposing surfaces, wherein the surfaces perform an expanding and contracting motion in accordance with the state of an electric field; a constraint member 21 a for constraining piezo-electric element 1 a on at least one of the two surfaces, a supporting member disposed around constraint member 21 a, and a plurality of beam members 22 a each having both ends fixed to constraint member 21 a and supporting member 4 a, respectively, wherein each beam member has a neutral axis for bending in a direction substantially parallel with the constrained surface, wherein the constraint member vibrates by vibration which is generated by the constraining effect between the constraint member and the piezo-electric element, and is amplified by the beam members.

A system incorporating a balanced mechanical resonator and a method for vibration of a sample composed of granular material to generate motion of a powder sample inside the sample holder for obtaining improved analysis statistics, without imparting vibration to the sample holder support.

The invention relates to a one-way double-acting high-frequency vibration hot-pressing vacuum sintering furnace. The one-way double-acting high-frequency vibration hot-pressing vacuum sintering furnace comprises a control center (47), a hydraulic station (46), a cooling water station (49), a vacuum extractor (50), a furnace body (48), a high-frequency vibration boosting device (13) and a furnace frame (51). The control center (47), the cooling water station (49) and the vacuum extractor (50) are connected with the furnace body (48), the hydraulic station (46) is connected with the high-frequency vibration boosting device (13), the high-frequency vibration boosting device (13) is connected with the furnace body (48), and the furnace body (48) and the high-frequency vibration boosting device(13) are arranged in the furnace frame (51). According to the sintering furnace, high-performance ceramic, metal and some refractory metal compound products are prepared in the manner that high-frequency vibration and static load pressure are combined, the one-way double-acting high-frequency vibration hot-pressing vacuum sintering furnace has the beneficial effects that the vibration amplitude is large, vibration pressure is easy to control, the precision is high, and the cost is low, and therefore broad market prospects are achieved.

The embodiment of the invention discloses a method for controlling noise reduction of a smoke exhaust ventilator. The method comprises performing vibration compensation on a smoke exhaust ventilator component according to a preset compensation frequency spectrum, detecting a vibration frequency spectrum of the smoke exhaust ventilator component, and if the vibration frequency spectrum of the smokeexhaust ventilator component does not satisfy the predetermined condition, adjusting the compensation frequency spectrum. Through adjusting the compensation frequency spectrum, the closed-loop control of the vibration compensation of the smoke exhaust ventilator component is realized so that the noise of the smoke exhaust ventilator is well reduced and the noise reduction effect is improved.

The invention discloses a mechanical rectification type piezoelectric cantilever beam vibration energy collector. The energy collector includes a base, a fixed support end fixed to the base, a piezoelectric cantilever beam fixed to the fixed support end, and a piezoelectric cantilever attached to the tip of the piezoelectric cantilever beam. The mass block and the electrode bracket, the upper and lower surfaces of the mass block are respectively provided with an upper movable electrode and a lower movable electrode, and the upper movable electrode and the lower movable electrode are respectively connected to the two lead wires of the piezoelectric cantilever beam; the electrode bracket is fixed on the base, and the electrode bracket The upper fixed electrode, the middle fixed electrode and the lower fixed electrode are arranged from top to bottom, the upper fixed electrode is located above the upper movable electrode, the middle fixed electrode is located between the upper movable electrode and the lower movable electrode, and the lower fixed electrode is located on the lower movable electrode. Below, the upper fixed electrode is connected to the lower fixed electrode. The invention can convert piezoelectric alternating current generated by vibration into direct current through a mechanical rectifier, avoiding the voltage drop of a traditional electronic rectifier.

The invention relates to a magnetic field coupling wave energy collector which comprises multiple magnetic coupling unit assemblies and a rope. The multiple magnetic coupling unit assemblies are connected through the rope and are arranged in an array way; the magnetic coupling unit assemblies are formed by side-by-side superimposing multiple magnetic coupling units aligned in centers in an array way; the magnetic coupling units comprise movable magnets, and anti-magnet pyrolytic graphite plates, magnetism adjusting parts and electricity generation parts symmetrically arranged on two sides of the movable magnets; the movable magnets are cylindrical permanent magnets; the magnetic pole directions of the movable magnets are thickness directions; the movable magnets are built in a rolling springback rail and are consistent to a thickness direction of the rolling springback rail; the rolling springback rail is embedded into an outer sleeve and is coaxial to the outer sleeve; and the anti-magnet pyrolytic graphite plates are arranged on two sides of the rolling springback rail and are embedded into the outer sleeve. Compared with the prior art, the magnetic field coupling wave energy collector provided by the invention can be beneficial to improving the output power, can effectively work under microwave, adapts to multi-directional wave excitation, and overcomes the defect of low output power of an existing small wave energy collector.

The invention discloses a gain-adjustable surface acoustic wave micro-gyroscope based on graphene thin films. The gain-adjustable surface acoustic wave micro-gyroscope comprises a piezoelectric substrate, a surface acoustic wave resonator and a surface acoustic wave detector and is characterized in that the surface acoustic wave resonator comprises interdigital transducers, metal lattices are arranged between the interdigital transducers, and reflectors and sound absorption rubber are arranged on the outer sides of the interdigital transducers; the surface acoustic wave detector comprises delay lines symmetrically arranged on two sides of the surface acoustic wave resonator, and the delay lines are parallel with the surface acoustic wave resonator; each delay line comprises a pair of single-phase one-way interdigital transducers, one graphene thin film, a metal electrode I and a metal electrode II, the graphene thin film is arranged between the single-phase one-way interdigital transducers and provided with the metal electrode I and the metal electrode II, and the metal electrode I and the metal electrode II are vertical to the acoustic wave propagation of the surface acoustic waveresonator. The gain-adjustable surface acoustic wave micro-gyroscope has the advantages that by applying voltage to the electrodes to form electric fields, Coriolis effect secondary surface acousticwave gain is regulated, and the sensitivity, accuracy and stability of the micro-gyroscope are increased effectively.