11 results about "Mechanical vibration" patented technology

The present invention provides a method for determining arc discharge as well as failure of mechanical vibration and abnormal displacement in power equipment using acoustic energy feature. Here, acoustic energy feature is firstly introduced to realize real-time, online inspection of failure in power equipment, enabling qualitative determination of discharge as well as mechanical vibration and abnormal displacement, so as to improve early warning before damage. Two factors, in which one is early detection of discharge, and the other is early detection of mechanical vibration and abnormal displacement, are considered. When abnormality of any one of these factors is emerged, it is demonstrated that hidden trouble is presented. Here, acoustic energy feature is used to perform real-time, online monitoring. Due to reliable diagnosis and strong interference resistance provided by sound source signals, the operating condition in which the equipment is situated may be reflected clearly, avoiding damage to electric power grid.

A fabrication process produces markers for a magnetomechanical electronic article surveillance system. The marker includes a magnetomechanical element comprising one or more resonator strips of magnetostrictive amorphous metal alloy; a housing having a cavity sized and shaped to accommodate the resonator strips for free mechanical vibration therewithin; and a bias magnet to magnetically bias the magnetomechanical element. The process employs adaptive control of the cut length of the resonator strips, correction of the length being based on the deviation of the actual marker resonant frequency from a preselected, target marker frequency. Use of adaptive, feedback control advantageously results in a much tighter distribution of actual resonant frequencies. Also provided is a web-fed press for continuously producing such markers with adaptive control of the resonator strip length.

The invention discloses an ultrasonic improved fabric dyeing device and a process thereof. The ultrasonic improved fabric dyeing device comprises a dyeing furnace and a workbench; a dyeing cylinder isfixedly arranged in the dyeing furnace; a temperature sensor A is fixedly mounted on an inner side of the dyeing cylinder; an electric heating thermostatic water bath is fixedly arranged on an outerside of the dyeing cylinder; a support A is arranged on an upper end of an inner cavity of the dyeing furnace; and an ultrasonic transmitter A and a transducer A are arranged on an upper end of the support A. The ultrasonic improved fabric dyeing device and process can measure and obtain the dyeing rate at different dyeing temperatures and radiation frequencies, and compare and obtain the dyeing temperature and the radiation frequency at the best dyeing rate; an ultrasonic frequency signal emitted by an ultrasonic transmitter B is converted into co-frequency mechanical vibrations through a transducer B, the dye liquor is irradiated in an ultrasonic longitudinal wave form so as to enhance the stirring and diffusion effect of the dye, the dissolution of the soluble dye is accelerated, and the dyeing rate is improved. The best dyeing temperature and radiation frequency can be measured when different fabrics are dyed so as to improve the dyeing rate, and measurement is convenient.

The embodiment of the invention provides a vibration absorber, a floating plate track, and a vibration reduction method, and relate to the field of mechanical vibration reduction. The vibration absorber comprises an elastic cushion and a first mass block fixed to the elastic cushion, wherein the elastic cushion is arranged on the surface of an object to be damped. The vibration absorber generatesa resonance frequency similar to the resonance frequency of the object to be damped through the elastic cushion and the first mass block, so that the vibration energy generated by the object to be damped is transferred to the vibration absorber. Compared with the prior art, the vibration absorber has the beneficial effects that the resonance frequency of the vibration absorber is close to the resonance frequency of the object to be damped; and the vibration energy of the object to be damped near the natural frequency is transferred to the vibration absorber through the vibration absorption effect of the vibration absorber so as to weaken the vibration of the object to be damped.

The invention relates to a transverse anti-symmetric elastic wave excitation device, which comprises a piezoelectric vibration assembly, a connecting and fixing piece and a wiring group of the piezoelectric vibration assembly. The piezoelectric vibration assembly comprises two identical piezoelectric electret films, namely a first piezoelectric electret film and a second piezoelectric electret film of which the short sides are aligned with each other. The connecting and fixing piece is used for fixing the piezoelectric vibration assembly to the surface of a structure and ensuring that the piezoelectric electret films are insulated from the surface of the structure. The first piezoelectric electret film and the second piezoelectric electret film are respectively connected with excitation voltage signals which are provided externally and have a phase difference Pi through the wiring group so as to convert the excitation voltage signals into mechanical vibration, and the mechanical vibration is conducted to the surface of the structure through the connecting and fixing piece to complete excitation of transverse anti-symmetric elastic waves. Compared with the prior art, the transverse anti-symmetric elastic wave excitation device has the advantages that the structure is simple, preparation is convenient, and the blank that there is no transverse anti-symmetric elastic wave excitation device at present is filled.

The invention belongs to the field of dust falling and environmental protection, and provides a rapid replacement device suitable for a dust falling nozzle on a mine continuous mining machine. The invention relates to a nozzle core assembly and a nozzle holder. The nozzle core assembly is composed of a nozzle core 1, a hexagon nut 2, a rubber gasket 3 and a fastening pin 5. The two ends of the fastening pin 5 are placed in the corresponding L-shaped groove channels in the nozzle base 4, installation of the nozzle is completed through clockwise screwing, and disassembly is completed through anticlockwise screwing. The fastening pin penetrates through the nozzle core, the nozzle core assembly is tightly connected with the nozzle seat 4, and the nozzle core is prevented from loosening and falling off due to mechanical vibration or external force. And the rubber gasket 3 is used for preventing the nozzle core and the nozzle seat from directly contacting to cause abrasion at the contact part, and also plays a sealing role. The whole device is made of stainless steel materials, and corrosion is prevented. The device has the advantages that a matching structure of the nozzle and the nozzle holder is designed, so that quick mounting and dismounting are realized when the nozzle is replaced, and the device is time-saving, efficient and reliable.

The invention discloses a low-temperature cold superconducting vibration isolation device for a space low-temperature refrigerator. An upper cover plate and a lower cover plate are both horizontally arranged and arranged in a vertically spaced mode, a cold superconducting spring comprises a sectional material, the sectional material is vertically and spirally arranged, located between the upper cover plate and the lower cover plate and connected to the upper cover plate and the lower cover plate, a cavity is formed in the sectional material in the length direction of the sectional material, the upper end of the sectional material is a closed end so as to close the upper end of the cavity, the lower end of the cavity is exposed out of the lower end of the sectional material, one end of the connecting pipeline is connected with the lower end of the sectional material and communicated with the lower end of the cavity, the other end of the connecting pipeline is communicated with an expansion container, a liquid filling pipe is arranged on the expansion container, and the expansion container, the connecting pipeline and the cavity are filled with the low-temperature cold conduction working medium. The device can effectively isolate mechanical vibration of the cold head of the low-temperature refrigerating machine, has the advantages of being good in cold conduction effect, light in weight and small in size are achieved, and can effectively solve the problems of cold conduction and mechanical vibration isolation between the cold head of the low-temperature refrigerating machine and a cooled object.

The invention belongs to the field of mechanical vibration control, and aims to provide an insect-imitating low-frequency vibration isolation structure. According to the structure, the bearing capacity and rigidity of the vibration isolator can be adjusted, and broadband and low-frequency vibration isolation can be achieved through nonlinear rigidity and damping. According to the technical scheme, the insect-imitating low-frequency vibration isolation structure is characterized in that the low-frequency vibration isolation structure comprises an upper base plate and a lower base plate which achieve relative movement in the vertical direction through a vertical direction guide structure, a serial rhombic structure arranged between the upper base plate and the lower base plate and used for applying a restoring force, and a horizontal direction guide structure connected to the serial rhombic structure in series so as to increase the non-linear inertia force and the non-linear damping force to the upper base plate and the lower base plate.

The earthquake experience platform is driven by a crank-connecting rod mechanical vibration source. In the figure, 1 is the top frame of the platform, 2 is the center column, 3 is the driving mechanism in the X direction, 4 is the driving mechanism in the Y direction, and 5 is the driving mechanism in the Z direction. During operation, the X-direction vibration source, the Y-direction vibration source, and the Z-direction vibration source start at the same time, and the X-direction vibration source drives the center column 2 and the platform top frame 1 to reciprocate along the X direction, and the Y-direction vibration source is driven by the Y-direction telescopic rod. The platform support reciprocates along the Y direction, and the Z-direction vibration source drives the platform top frame to reciprocate along the vertical direction through the L-shaped swing frame and the double ten-byte mechanism. The platform support simultaneously performs horizontal X-direction, horizontal Y-direction and vertical composite Movement and movement in all directions do not interfere with each other, increase the vibration frequency of the platform, and increase the authenticity of the earthquake experience.

The invention discloses an automotive air conditioner compressor shell structure. The automotive air conditioner compressor shell structure comprises a shell body, and the shell body is provided withmultiple compressor installing supporting lugs; a first rib plate and a second rib plate are arranged on the inner side face of the bottom of the shell body, the first rib plate and the second rib plate are perpendicular to each other to form a cross-shaped partition rib, and the two sides of the first rib plate and the two sides of the second rib plate are connected with the inner wall of the shell body separately; an annular rib which axially extends along the shell is arranged among the cross-shaped partition rib formed by the first rib plate and the second rib plate, and four fan-shaped sound insulation cavities are formed between the annular rib and the cross-shaped partition rib and used for dispersing impact of high-pressure gas in the shell; and an arc-shaped rib is arranged at thebottom of the shell, and the two ends of the arc-shaped rib extends to the compressor installing supporting lugs. According to the automotive air conditioner compressor shell structure, the strengthand the rigidity of the bottom of the shell are improved, shell bottom noise caused by mechanical vibration is reduced, impact of gas pulsation to the shell bottom is dispersed through height difference formed among the fan-shaped sound insulation cavities and formed between the sound insulation cavities and an exhaust port, and noise generated by compressors is reduced.