15 results about "Torsional wave" patented technology

The invention relates to the technical field of hemispherical harmonic oscillator assembly, in particular to a welding method and device for an assembled hemispherical harmonic oscillator, and the device comprises a vibration welding platform and a clamping assembly located above the vibration welding platform; the vibration welding platform is used for bearing the sensitive base and providing a thermal field and a vibration field needed by welding, and the clamping assembly is used for clamping the center shaft and sending the center shaft into a center hole of the base. A heating unit and a composite vibration ultrasonic transducer are arranged in the platform, and the platform is configured to apply high-frequency vibration formed by superposition of vertical longitudinal waves and horizontal torsional waves to the base. The high-frequency vibration thixotropic effect is used for reducing the viscosity of the molten solder, the ultrasonic cavitation effect is used for forcibly discharging bubbles at the bottom of the blind hole, and the sound radiation pressure generated by the vibration standing wave field is used for driving the center shaft to achieve friction-free self-centering in the hole. According to the device, the problems of air bolt pseudo soldering and rigid assembly clamping stagnation in the traditional process are solved, and the assembly coaxiality and the connection strength of the harmonic oscillator are remarkably improved.

The invention relates to the technical field of underground water level monitoring, and discloses a magnetostriction float type underground water level meter and an underground water level measuring method and device. Comprising a coiled pipe body, and the cross section of the coiled pipe body is provided with a central large circular hole and a plurality of small circular holes which are symmetrically distributed; a water inlet hole blocked by permeable stone is formed in the bottom of the pipe body capable of being coiled; the electronic bin is in sealed connection with the top of the pipe body capable of being coiled, the electronic bin is fixedly connected with the ground protection pipe through a tensile steel wire rope, and scale information is arranged on the surface of the tensile steel wire rope; the floater assembly is arranged in the central large circular hole and comprises a hollow floating body and a built-in permanent magnet; the waveguide sensing assembly is characterized in that a closed-loop measuring loop formed by a waveguide sensing wire and a cable is arranged in a small circular hole, and the closed-loop measuring loop generates a torsion wave signal through an excitation circuit in an electronic bin; the magnetostriction signal processing module is arranged in the electronic bin; and acquiring the extension length of the measured tensile steel wire rope, and calculating the underground water level according to the extension length and the relative displacement.

The present application relates to the technical field of pipeline nondestructive testing, and discloses a pipeline defect diagnosis method based on guided wave technology. The method obtains original guided wave response signals under multiple excitation frequencies through a guided wave sensor array arranged on the outer wall of the pipeline, performs multi-stage analysis and separation on the signals, extracts a set of independent wave mode components directly related to the defects, including longitudinal wave components, torsional wave components and surface wave components. According to the propagation time delay and energy distribution of each component, a multi-dimensional defect feature tensor is constructed, input into a trained pipeline defect discrimination network for feature mapping and abstraction, and a preliminary diagnosis report of the defect category and geometric profile is output. Combined with the pipeline service environment parameters, the physical field coupling correction is carried out to generate the final diagnosis result. The method solves the problems of serious mode aliasing and poor environmental adaptability in the traditional guided wave technology, and realizes accurate identification and positioning of defects.

The invention discloses a control rod position measuring device, method and system for a miniaturized lead-based reactor. The device comprises a permanent magnet arranged on a control rod and used for generating an axial bias magnetic field; the protection tube is parallel to the control rod, and a first detection coil and a second detection coil sleeve two ends of the protection tube; the magnetostrictive waveguide wire in the protection tube responds to the pulse current to generate a pulse magnetic field; the magnetostrictive waveguide wire excites torsional waves propagating along the two ends of the magnetostrictive waveguide wire based on the superposed spiral magnetic field; the first detection coil and the second detection coil respectively induce torsion waves to generate voltage signals; the signal processing module is used for amplifying, filtering and digitally processing the two paths of voltage signals and determining the distance between the permanent magnet and the top of the magnetostrictive waveguide wire according to the two paths of digital signals, so that the rod position of the control rod is accurately represented. According to the invention, a double-detection coil structure is adopted to eliminate a measurement blind area, and the device is compact in structure, has temperature drift resistance and is suitable for spatial constraint of a miniaturized lead-based reactor.

This invention provides a signal processing system for a magnetostrictive level gauge, relating to the field of signal processing technology. The system includes a pulse current generator, a waveguide wire, a receiving coil, a signal amplification circuit, a signal amplitude filter, a signal pulse width filter, and a processing chip with a high-speed timer function. The pulse current generator applies a pulse current to the waveguide wire; the waveguide wire generates a torsional wave signal when the pulse current is applied; the receiving coil generates an induced voltage pulse signal in response to the torsional wave signal; the signal amplification circuit amplifies the signal; the signal amplitude filter performs amplitude filtering on the signal; the signal pulse width filter performs pulse width filtering on the signal; and the processing chip with the high-speed timer function measures the propagation time of the torsional wave signal based on the received signal. This system can accurately measure the propagation time of the torsional wave, ensuring the measurement accuracy of the magnetostrictive level gauge.

The invention provides an ultrasonic guided wave online monitoring device and method for corrosion of an offshore wind power jacket, and the method comprises the steps: generating four-channel excitation signals with a preset phase relation through a DSP signal processing and control system, and respectively driving four quadrants of a four-quadrant piezoelectric ceramic transducer array; the modal suppression sensor group monitors the propagated wave field; and the DSP signal processing and control system analyzes the signals, identifies a residual interference mode, adjusts excitation signal parameters of the four-quadrant piezoelectric ceramic transducer array, feeds back and controls in real time, and suppresses the interference mode to the lowest level. After the pure torsion wave is propagated along the jacket pipe and interacts with the corrosion defect, the four-quadrant piezoelectric ceramic transducer array collects a reflected echo signal. And the DSP signal processing and control system processes the collected echo signal, outputs a detection signal with a high signal-to-noise ratio, and evaluates the corrosion state of the jacket according to the signal. According to the invention, reliable and long-term on-line monitoring of the corrosion state of the jacket is realized.

A dynamic torsion-tension / compression synchronous combined loading device and loading method, through a delay pulse generator, a torsional wave and a tensile / compressive wave are simultaneously arrived at a sample, and finally a torsion, a tensile / compressive composite dynamic loading is realized. In the application, energy is stored through a rotating torque loading mechanism, and the size of the energy is obtained in real time through a strain flower pasted on a torsional incident rod. After the energy storage is completed, the clamping bolt of the rotating clamping mechanism is clamped to make the broken bolt be broken under tension, so that the energy stored in the energy storage section of the torsional incident rod is transmitted to the sample in the form of a stress wave, the strain flower located on the torsional incident rod can record the waveform of the torsional wave, and the sample is dynamically torsionally loaded when the torsional wave reaches the sample. Through accurate control of the delay time, the torsional wave and the tensile wave can be simultaneously arrived at the sample, and the dynamic tensile-torsion composite loading of the sample is realized. A data collector simultaneously records the stress wave pulse signals on the torsional incident rod and the tensile incident rod.

The present application relates to the technical field of hemispherical resonator assembly, and particularly relates to a welding method and device for an assembled hemispherical resonator, which comprises a vibration welding platform and a clamping assembly above the vibration welding platform; the vibration welding platform is used for bearing a sensitive base and providing a thermal field and a vibration field required for welding, and the clamping assembly is used for clamping a central shaft and feeding the central shaft into a central hole of the base. The platform is internally provided with a heating unit and a composite vibration ultrasonic transducer, which are configured to apply high-frequency vibration of superimposed vertical longitudinal waves and horizontal torsional waves to the base. The present application utilizes the thixotropic effect of high-frequency vibration to reduce the viscosity of molten solder, utilizes the ultrasonic cavitation effect to forcibly discharge bubbles at the bottom of a blind hole, and utilizes the acoustic radiation pressure generated by a vibration standing wave field to drive the central shaft to realize self-centering without friction in the hole. The device solves the problems of air lock virtual welding and rigid assembly jamming in the traditional process, and significantly improves the coaxiality and connection strength of the resonator assembly.

The application provides a signal enhancement detection device of a magnetostrictive liquid level meter and a preparation method thereof, and belongs to the technical field of liquid level measurement. The device comprises a support, one end of the support is fixedly connected with a copper sleeve, one end of a waveguide wire penetrates through the copper sleeve and is welded with an end face of the copper sleeve. A detection band is further welded on the waveguide wire and located on the front side of the welded end face of the copper sleeve. A coil protection tube is fixedly arranged on the detection band. A detection coil is arranged outside the coil protection tube and fixed with the support. A permanent magnet is fixedly arranged outside the coil protection tube, the permanent magnet is fixed with the support and located below the detection coil. The device can effectively enhance the signal amplitude of the torsional wave, improve the measurable range of the magnetostrictive liquid level meter, and realize the liquid level measurement of multiple liquid surfaces without adding damping.

The invention discloses a municipal pipeline internal blockage three-dimensional positioning and quantitative evaluation method based on cooperation of pulse pressure waves and ultrasonic guided waves. Comprising the following steps: S1, acquiring basic parameters of a target pipeline and initializing a propagation model; s2, performing pressure wave excitation and multi-point signal acquisition; s3, establishing an in-pipe pressure wave propagation model and introducing blockage equivalent impedance; s4, performing pulse pressure wave-based blockage axial position inversion and blockage degree preliminary quantification; s5, performing ultrasonic guided wave excitation and annular signal acquisition; s6, enabling the blockages attached to the inner wall of the pipe to be equivalent to a local contact stiffness-additional mass-damping system, constructing a circumferential abnormal index, and calculating the circumferential position angle of the blockage, so as to achieve the circumferential accurate positioning of the blockage based on the torsional wave characteristics without reflecting echoes; s7, fusing the pressure wave information and the guided wave information, and performing blockage position three-dimensional schematic reconstruction; and S8, carrying out joint inversion and correction on the blockage degree.

A wireless downhole information transmission system is presented, which is preferably adapted for operation in a well (wellbore) and in particular in a well of the oil and gas and geothermal industry. The information transmission system comprises an elongated pipe (completion) having a plurality of pipe sections, including a first end pipe section and a last end pipe section, an information signal generator arranged at or near the first pipe section of the elongated pipe, the information signal generator being designed as a torsional wave generator for transmitting a torsional wave information signal along the elongated pipe, and an information signal receiver arranged at or near the last pipe section of the elongated pipe, wherein the elongated pipe between the signal generator and the signal receiver constitutes a carrier for transmitting the information signal between the signal generator and the signal receiver.

The invention discloses a dynamic measuring device, method and system for the gauge of a railway stock rail, and the device comprises a magnetostrictive displacement sensing part which comprises an electronic cabin and a measuring rod, and the electronic cabin is internally provided with a control and collection module and a processor; the first detection magnetic block and the second detection magnetic block are fixedly arranged on the rail webs of the left stock rail and the right stock rail respectively and generate a magnetostrictive effect with the measuring rod; wherein the control and acquisition module is used for sending excitation pulses to the measuring rod and receiving torsional wave echo signals generated by the first detection magnetic block and the second detection magnetic block; the processor calculates the distance between the first detection magnetic block and the second detection magnetic block according to the torsional wave echo signal, and the distance serves as a gauge value. Compared with the prior art, the magnetostrictive displacement sensor is combined with the double detection magnetic blocks, and the magnetostrictive effect is utilized, so that real-time and high-precision dynamic monitoring of the rail gauge of the railway stock rail is realized.

The invention relates to a high rigidity superstructure drill rod with a low frequency multidirectional vibration band gap, and relates to the technical field of mechanical vibration, the drill rod comprises a base rod, the base rod is in a hollow cylinder shape, a plurality of additional layers are respectively arranged on the base rod along the axial direction, and each additional layer comprises a scatterer ring layer and two soft material ring layers. The soft material ring layer, the scatterer ring layer and the hard ring are periodically arranged to form the local oscillator, when the corresponding waveform excitation frequency is close to the fixed frequency of the local oscillator, the vibration mode of the local oscillator can be activated and amplified into a main mode which is coupled with the vibration mode of the superstructure base rod, and the vibration mode of the local oscillator is coupled with the vibration mode of the superstructure base rod by applying counter-acting force to the superstructure base rod. The vibration mode of the base rod in the waveform propagation direction is restrained, so that the medium-wave propagation mode of the base rod disappears, transverse waves, longitudinal waves and torsional waves cannot be propagated in the super-structure drill rod and are superposed to form a complete band gap, simultaneous control over vibration of the longitudinal waves, the transverse waves and the torsional waves in the low-frequency range in engineering is achieved, and safety and efficiency in drilling operation are improved.

A method and system for damping high frequency torsional oscillations (HFTO) of a downhole system including a motorized or non-motorized BHA, the damping system including a drilling system disposed at an end of the downhole system in operative connection with a drill bit, and a damping system installed on the drilling system, the damping system comprising a plurality of drill string subs distributed periodically along the drill string, the subs of the plurality designed and configured to put HFTO frequencies in passbands of torsional wave at a damper section, each sub comprising at least one damper element configured to dampen at least one HFTO mode, and stopband features directly adjacent at least some of the damper elements. A model of a drill string within a simulation may be used to determine design aspects of the damper sub that provides passband features and a stopband sub.

This invention discloses an ultrasonic scalpel holder that achieves pure torsional output through helical grooves, comprising a scalpel holder, an ultrasonic transducer, an amplitude transformer assembly, a first connector, and a second connector. The ultrasonic transducer includes a primary amplitude transformer and two identical ultrasonic generating assemblies symmetrically connected to both ends of the primary amplitude transformer. A first flange is provided in the middle of the primary amplitude transformer, and a first helical groove and a second helical groove are symmetrically formed on both sides of the first flange on the outer wall of the primary amplitude transformer. The structural parameters of the first and second helical grooves are determined by a method including the following steps: constructing stress-strain equations for the incident, reflection, and refraction of plane waves at the first and second helical grooves; solving the stress-strain equations to determine the torsional principal stress wave and the torsional principal stress angle, which are dominated by the synthesis of reflected longitudinal waves and refracted transverse waves propagating circumferentially; and determining the structural parameters of the first and second helical grooves based on the torsional principal stress wave and the torsional principal stress angle.