241 results about "Resonance vibration" patented technology

To conduct a fluid, the transducer has a flow tube which in operation vibrated by an excitation assembly. Inlet-side and outlet-side vibrations of the flow tube are sensed by means of a sensor arrangement. To produce shear forces in the fluid, the flow tube is at least intermittently excited into torsional vibrations about a longitudinal flow-tube axis. An internal portion of the transducer, formed at least by the flow tube, an antivibrator, the sensor arrangement, and the excitation assembly and mounted at least on the inlet and outlet tube sections, has a centroid which is located inside the flow tube. The transducer is suitable for use in viscometers or Coriolis mass flowmeter-viscometers. In spite of using only a single straight flow tube, it is dynamically well balanced in operation, and the development of bending moments by the torsionally vibrating flow tube is largely prevented. This also effectively prevents the transducer case or the connected pipe from being excited into sympathetic vibration. Measurement signals representative of mass flow rate are readily distinguishable from measurement signals representative of viscosity, particularly if the sensors used for the viscosity measurement are also used for the mass flow measurement.

The invention provides resonant vibratory sensors to render such resonant vibratory sensors more beneficial than conventional MEMS-based and non-MEMS-based resonant vibratory sensors for various usage applications, such as portable applications requiring navigation-grade performance. The resonant vibratory sensors include as examples an oscillator, a vibratory gyroscope and a vibratory accelerometer. In one embodiment, the resonant vibratory sensor is a disk resonator gyroscope. The improved resonant vibratory sensors employ materials having an ultra low thermal expansion coefficient, which provides an improved thermoelastic quality factor.

The invention provides a magnetic coupling resonance-typed wireless energy transmission device, relating to the field of wireless energy transmission and solving the shortage that the prior art can not carry out the transmission with the barrier or has short transmission distance. The magnetic coupling resonance-typed wireless energy transmission device consists of an energy emission source and an energy receiver; by virtue of the two electromagnetic systems with the same special resonance frequency, with a certain distance, the energy transmission is carried out as the resonance is generated owing to the identical vibration frequency. The energy emission source consists of a magnetic field resonance excitation and driving circuit and a resonance emission circuit; the resonance emission circuit consists of a resonance emission coil and a resonance emission capacitor; the energy receiver consists of a resonance receiving circuit and a high-frequency rectifier circuit; the resonance receiving circuit consists of a resonance receiving coil and a resonance receiving capacitor; the magnetic field is generated by the resonance emission coil; the resonance receiving coil and the magnetic field have the same oscillation frequency and generates the magnetic resonance; the energy in the resonance receiving coil is continuously collected and can be subsequently provided to the loads through the high-frequency rectifier circuit. The magnetic coupling resonance-typed wireless energy transmission device has the advantages of long transmission distance and no barriers.

A method for utilizing a stainless steel framework for changing the resonance frequency range of a flexure nose portion of a head gimbal assembly is disclosed. The method provides a slider coupled with the head gimbal assembly, the slider having a read/write head element thereon. In addition, a flexure nose portion is coupled with the head gimbal assembly. A stainless steel framework is provided between the flexure nose portion and the head gimbal assembly for changing the resonance vibration frequency of the flexure nose portion.

An apparatus for active vibration is provided for control of resonance vibrations in a computed tomography (CT) system. The apparatus comprises a sensor coupled to a support frame of the CT system for detecting resonance vibrations and and convert the vibration signal to a corresponding electrical signal. The apparatus further comprises a control device coupled to the sensor for implementing a control algorithm to process the electrical signal to generate a corresponding control signal, which is used for counteracting the resonance vibrations in the support frame.

At least one apparatus capable of producing resonant vibrations, such as at least one vibrational therapy apparatus that includes at least one platform member having at least one vibrating plate assembly for providing vibrational energy is disclosed. The platform member is configured for mounting to a patient support structure such as a bed or a surface of a pallet. The vibrational therapy apparatus includes a mounting apparatus configured to receive the at least one vibrating plate assembly for securely positioning and removably mounting the at least one platform member to the patient support structure, such as with respect to a surface of the bed or of the pallet. A mounting apparatus is configured to support at least one apparatus capable of producing resonant vibrations, wherein the mounting apparatus is configured for and adapted for mounting the at least one apparatus capable of producing resonant vibrations to a patient support structure.

Methods, systems and computer program products for assessing residual life of an airfoil, which would experience high cycle fatigue failure under at- or near-resonance vibration condition, are provided. The method includes receiving, at a processing system, at least one vibration response parameter associated with the airfoil. The method processes at least one cracked airfoil finite element model. Processing the cracked airfoil finite element model includes accessing the cracked airfoil finite element model, computing a modal stress intensity factor (SIF) of the cracked airfoil finite element model using fracture mechanics based finite element analysis, and computing a vibratory SIF based, at least in part, on the modal SIF and the at least one vibration response parameter. The method then computes a residual life indicator of the airfoil based, at least in part, on the vibratory SIF.

A double resonance vibration motor includes a housing, vibration parts in the housing, a coil fixed in the housing, and elastic connectors to support elastically the vibration part. The vibration parts include a mass block, a first magnet group and a second magnet group installed in the mass block. The coil is opposite to the first magnetic group and the second magnetic group. The driving force generated by the first magnetic group and the coil makes the vibration motor vibrate along the first direction. The driving force of the second magnet group and the coil makes the vibration motor vibrate along the second direction. The first direction and the second direction are intersected. Two different directions have respectively one resonance frequency. Two different resonant frequencies can vibrate alone or at the same time, to realize the control in different vibration directions.

The invention relates to a power machine assembly used for an electric vehicle, and belongs to the technical field of electric drive system structures. The power machine assembly comprises a motor hollow gear shaft connected with a hollow shaft motor; the motor hollow gear shaft is connected with a motor gear sleeve through a spline; the motor gear sleeve is engaged with a bull wheel (7) of a stepped gear arranged on a gear supporting shaft through a gear structure; a small wheel of the stepped gear which is integrated with the bull wheel of the stepped gear is also arranged on the gear supporting shaft; the small wheel of the stepped gear is engaged with an inner gear through the gear structure; the inner gear is connected to a differential mechanism shell through the spline; a differential mechanism is arranged in the differential mechanism shell; and the differential mechanism is linked with a half shaft. By using the power machine assembly used for the electric vehicle, the structure is simple, the noise is low, the efficiency is high, the resonance vibration is small, the start is fast, and energy saving is realized.

The invention discloses a sub-ultrasonic high-frequency fatigue testing machine. An energy converter used as a driving force source, the energy converter, a tested sample and a driven amplitude transformer form a resonance system, and a prearranged static loading mechanism provides static load for a test piece. The energy converter can be a full-wavelength energy converter or a half-wavelength energy converter. The energy converter converts an electric signal into mechanical vibration under the driving of an external alternating voltage, so the whole system is in a resonance state, and the tested sample has resonance vibration and a stress, thereby the fatigue detection can be realized. The energy converter can be a piezoelectric energy converter or a giant magnetostrictive energy converter. The sub-ultrasonic high-frequency fatigue testing machine allows the sub-ultrasonic high-frequency fatigue tests of the test piece under different stress ratios to be carried out according to the system prearrangement state; compared with traditional high-frequency fatigue testing machines, the sub-ultrasonic high-frequency fatigue testing machine has the advantages of simple structure, small volume, test period shortening, high efficiency and energy saving; and compared with present ultrasonic fatigue testing machines, the sub-ultrasonic high-frequency fatigue testing machine has the advantage of reduction of the frequency effect and the dimension effect to the material fatigue performances.

An automobile test bench comprises a portal frame, at least one group of actuator, a clamp mechanism and a supporting mechanism which supports the structure of the whole test bench, the clamp mechanism is respectively connected with the actuator and the supporting mechanism and used for fixing a test article, the actuator is movably installed on the portal frame and comprises a sliding mechanism, an actuating cylinder and spherical hinges, wherein the sliding mechanism is installed on a beam of the portal frame, the spherical hinges are arranged at the upper and lower ends of the actuating cylinder, the sliding mechanism is connected with the actuating cylinder through the upper end spherical hinge, and the clamp mechanism is connected with the actuating cylinder through the lower end spherical hinge. The actuator is connected through the gapless spherical hinges, the problem of resonance vibration caused by fit clearance is eliminated, moreover, the actuating cylinder is capable of moving, convenience of the installation of the test article is increased, and working efficiency is improved.

A discharge region of a centrifugal compressor is provided. A scroll casing is asymmetrically formed in a circumferential direction and configured to be positioned in different angular positions in the circumferential direction. A vaned diffuser is configured to be positioned in different angular positions in the circumferential direction. The vaned diffuser includes a plurality of guide elements configured to be arranged in a distributed manner in the circumferential direction. Means are provided for positioning the vaned diffuser with regard to an angular position of the asymmetrically formed scroll casing. An angular spacing of two guide elements which are arranged adjacently to each other differs from an angular spacing of two other guide elements which are arranged adjacently to each other. By varying the angular spacings between two adjacent guide vanes of a diffuser along the circumference, the resonance vibration of the compressor can be reduced.

A piezoelectric vibrator comprising: a thin rectangular piezoelectric plate formed of a material having a Young's modulus having to short edges surfaces and two long edge surfaces and two long planar face surfaces which plate has transverse resonant vibration modes parallel to its short edges and longitudinal resonant vibration parallel to its long edges and is formed with at least one cavity; and least one electrode on each of the planar surfaces that is electrifiabie to excite at least one vibration mode of the plate, wherein the at least one cavity is not filled with a material having a Young's modulus substantially equal to the Young's modulus of the material from which the place is formed, such that the presence of the at least one cavity shifts a resonant frequency of at least one vibration mode of the plate with respect to the resonant frequency that characterizes the at least one vibration mode in the absence of the at least one cavity.

A cleaning attachment for an ultrasonic powered handle includes a shaft mounting a cleaning implement (brush or scraper) at a tip end and either two parallel transverse channels in a front surface near the cleaning implement, or two parallel transverse channels in opposite side surfaces, so as to increase the resonant vibrational frequency of the cleaning implement beyond that expected from vibration generated by the ultrasonic powered handle.

This invention relates to one semiconductor mixture contraction measurement method based on freedom load flow absorption technique, which is characterized by the following: using one beam of photon with energy larger than the continuous laser with light intensity modulation of forbidden band as pump light source; using another beam of light smaller than semiconductor forbidden band width as detector light source; two beams of light are lighting onto same or adjacent positions on semiconductors; the semiconductor absorbs pump light to generate modulation free load flow; due to modulation free load flow absorbing through semiconductor or reflection detector light intensity by lock phase type or reflection detecting light signals for once resonance vibration and phase to get the mixture concentration.

The invention discloses a vibration-damping and noise-eliminating thermal expansion valve, which comprises a valve body (1), a power head (2), a push rod sleeve (3), a push rod (4), a steel ball valve core (5), a valve core holder (51), a damping clamp (6), a spring (7), an adjustment nut (8), and an O-shaped ring. According to the invention, the nylon push rod sleeve is arranged on the position where the push rod vertically penetrates through an air passage of the valve body; a refrigerant flow separating the air passage affects an aperture of the steel ball valve core by generating radial vibration to the push rod; and the damping clamp which is connected with the valve core holder and is elastically connected with the wall of a valve core hole is arranged in the valve core hole of the valve body, so that the aperture response motion of the steel ball valve core is lagged by friction damping between the damping clamp and the valve core hole, a flow adjustment response frequency of the thermal expansion valve is staggered with a peak phase of a vibration field frequency of an automobile, a sympathetic vibration technical scheme is avoided, and the sympathetic vibration and noise of an automotive air conditioning system during running can be eliminated.

The invention discloses a structure for reducing the equivalent unsprung mass of a single cross arm suspension wheel-side electric driving system; an elastic rubber is supported on a rack in a hinging way; one end of an oscillating arm of a single cross arm suspension is connected with the elastic rubber in a hinging way; the other end of the oscillating arm of the single cross arm suspension is connected with an electric machine which is fixedly arranged on a speed reducing case; the speed reducing case is connected with a half shaft sleeve pipe; a power output end of the electric machine isconnected with a pinion gear which is meshed with a main gear; the main gear is connected with the half shaft sleeve pipe; and after the electric machine is decelerated by the gears, the power is output to rims so as to drive wheels. The distance from the mass center of parts which are not concentric with the wheels to the oscillation central axis of the single cross arm suspension is reduced, namely, the equivalent unsprung mass is reduced. The structure has the advantages of reducing the equivalent unsprung mass of the wheel-side driving system so as to increase vibration frequency of the wheels, reduce resonance vibration and impact and vibration from road surfaces and improve smoothness of automobile driving.

An apparatus for generating electricity comprises a vibration plate, a supporting board, at least one side-wall unit and at least one piezoelectric substrate having a first- and a second end surfaces covered with a first- and a second electrodes, respectively. They all together form at least one cavity resonator. If a sound pressure from the outside arrives at the vibration plate, an acoustic vibration is excited in the vibration plate, and thereby a resonance vibration is induced in the cavity resonator. In this time, the piezoelectric substrate responds actively to the resonance vibration. Thus, a resonance energy occurred in the cavity resonator is converted into an electric energy, which is delivered through the first- and second electrodes.

A method and apparatus for reducing undesirable pressure fluctuations over predetermined pressure and frequency ranges in a working fluid system, facilitating maintenance of appropriate levels of stored energy in the fluid system. Embodiments may be employed within a fluid system to dampen pressure fluctuations over an adequately large pressure range, for example in a resonant vibratory system. In such systems, pressures vary dramatically depending on whether resonance is achieved. An apparatus comprises a pressure vessel having a self equilibrating flexible piston device. The piston separates a gas volume from a fluid volume exposed to the system flow. The piston translates within the pressure vessel to equilibrate the gas and fluid pressures. A flexible portion of the piston deflects at high frequency and adequate volume to reduce undesirable pressure fluctuations. The flexible portion translates force via its outer periphery to a ring portion which translates within the pressure vessel.

A system for insertion of a probe into a pressurized fluid stream by means of a threaded body formed to engage an elastomeric seal employed to form a fluid barrier thereabout. The present invention contemplates a system which effectively lessens resonance vibration effects and associated damage resulting there from in fluid sampling probes operating in high velocity fluid streams and the like, utilizing mechanical dampening properties associated with its seal(s) and insert(s), forming non-rigid attachment to support the length of the probe in a manner which facilitates resonance absorption and dampening, so as to lessen associated vibration/oscillation in the system. The threaded body forms, in effect, helical strakes to facilitate aerodynamic stabilization and reduce oscillations/vibration, as well as reduce force and deflection caused by high velocity fluid flow passing thereby.