13 results about "Flexural vibration" patented technology

This invention discloses a distributed, event-triggered, low-communication fine-grained attitude control method for spacecraft, aiming to overcome the problems of high communication frequency, severe resource waste, and difficulty in effectively compensating for multi-source interference in existing technologies. This method constructs a deeply coupled attitude model for the spacecraft, comprehensively considering the dynamic effects of combined interferences such as center-of-mass changes and flexural vibrations; designs an event-triggered mechanism based on changes in control signals to update control commands as needed, thereby reducing the communication frequency; and constructs an adaptive composite controller to estimate and compensate for interference and communication errors online, ensuring attitude control accuracy. In a 50-second simulation, this method triggers only 75 communications while controlling the attitude tracking error to within 5 × 10⁻⁶. ‑3 Within rad, it has the advantages of low communication load, high control precision, and strong anti-interference capability, and is suitable for distributed spacecraft systems with strict requirements for attitude stability and communication resource consumption.

The invention relates to the technical field of submersible pumps, in particular to a small brushless direct-current energy-saving submersible pump which comprises a pump shell, an impeller, a flow guide part, a motor stator and a permanent magnet rotor, the permanent magnet rotor is connected with the impeller through a driving shaft, and a first radial bearing and a second radial bearing are arranged at the two ends of the driving shaft respectively to form a double-end supporting structure; an independent thrust bearing is arranged at the permanent magnet rotor end of the driving shaft, and an axial force transmission interface is formed by the pressure bearing face of the thrust bearing and the permanent magnet rotor end cover. The service life is prolonged; and the operation reliability is improved.

A three-dimensional ultrasonic elliptical vibration cutting device has a two-dimensional ultrasonic vibration transducer, an asymmetric ultrasonic horn, and a cutter. The cutter is installed at the output end of the asymmetric ultrasonic horn, the two-dimensional ultrasonic vibration transducer is used for outputting ultrasonic longitudinal-flexural complex vibration, the asymmetric ultrasonic horn is used for converting and decomposing longitudinal vibration output by the two-dimensional ultrasonic vibration transducer into second-phase flexural vibration and longitudinal vibration, and outputting a three-dimensional ultrasonic elliptical vibration trajectory on the cutter in combination with first-phase flexural vibration output by the two-dimensional ultrasonic vibration transducer. A three-dimensional ultrasonic elliptical vibration trajectory is output in a double-excitation mode. The output three-dimensional ultrasonic elliptical vibration trajectory is adjusted according to different cutting applications and machining requirements.

A vibratory measurement recorder (100) for measuring a mass flow rate, comprising: a line inlet portion (18); a vibratable S-shaped measuring line (10) for conducting the medium, having a dual rotational symmetry with respect to an axis running perpendicular to the plane of the measuring line; a line exit portion (19); at least one vibration exciter (53) for exciting a flexural vibration of the measuring line (10) in a flexural vibration mode of operation; at least two vibration sensors for detecting vibrations of the measurement line; a support body (30); an inlet-side bearing body (21) and an outlet-side bearing body (22); wherein the measuring line (10) is fixedly connected to the support body (30) by means of the bearing body and is delimited by the bearing body; wherein the measuring line (10) adjoins the line inlet portion and the line outlet portion; wherein the measuring line (10) has two vibration nodes spaced apart from the bearing body in an F3 flexural vibration mode of operation; wherein two damper mass bodies (56, 58) are attached to the measurement pipeline (10), each having a center of gravity that does not exceed half of the outer diameter of the measurement pipeline (10) from a position where the closest vibration node is positioned when the measurement pipeline is filled with water.

A vibronic measuring sensor (1) comprises: an oscillator (10) having at least one first measuring tube (10.1, 10,2; 20.1, 20,2; 30.1, 30,2) for carrying a medium; a first electrodynamic exciter (15; 25; 35) for exciting the oscillator (10) to produce flexural vibrations of the at least one first measuring tube (10.1, 10,2; 20.1, 20,2; 30.1, 30,2), the first electrodynamic exciter (15; 25; 35) comprising a first excitation coil (15.1; 25.1; 35.1) and a first excitation magnet (15.2; 25.2; 35.2); which interact to excite the flexural vibrations; at least one second electrodynamic exciter (18; 28, 29; 38) for exciting the oscillator (10) to produce flexural vibrations of the at least one first measuring tube (10.1, 10,2; 20.1, 20,2; 30.1, 30,2); the at least one second electrodynamic exciter (18; 28, 29; 38) comprising at least one second excitation coil (18.1; 28.1, 28.2; 38.1) and at least one second excitation magnet (18.2; 28.2, 29.2; 38.2); which interact to excite the flexural vibrations; at least one inlet-side electrodynamic sensor arrangement (12a) for detecting the flexural vibrations of the at least one first measuring tube (10.1, 10,2; 20.1, 20,2; 30.1, 30,2); and at least one outlet-side electrodynamic sensor arrangement (12b) for detecting the flexural vibrations of the at least one first measuring tube (10.1, 10,2; 20.1, 20,2; 30.1, 30,2); a measuring and operating circuit which is configured to drive the electrodynamic exciters with excitation signals; and to detect sensor signals from the electrodynamic sensor arrangements in order to determine a mass flow measured value and / or a density measured value, and to determine a value of a monitoring parameter which depends on a state of the measuring tube; characterized in that the first excitation magnet has a first hard magnetic material, and the second excitation magnet has a second hard magnetic material, the first hard magnetic material being stronger and having lower long-term stability at high tempera

According to an example aspect of the present invention, there is provided a biopsy needle device comprising a biopsy needle attachment mechanism arranged to mechanically couple a biopsy needle to the biopsy needle device, an actuator mechanism comprising a transducer configured to interconnect electrical signals at one port to mechanical motion at another port, the actuator mechanism configured to transmit flexural vibration to the biopsy needle when the biopsy needle is coupled to the biopsy needle device, a sensor device configured to measure a power of the flexural vibration transmitted to the biopsy needle via the transducer and a reflected power of flexural vibration received by the biopsy needle device from the biopsy needle, and circuitry configured to determine a difference between the power of the flexural vibration transmitted to the biopsy needle and the reflected power of flexural vibration received by the biopsy needle device from the biopsy needle.

The invention relates to a method (100) for monitoring a Coriolis mass flowmeter having an oscillator with at least one measuring tube, the method comprising: - exciting (110) the oscillator in order to induce a flexural vibration of a first anti-symmetrical vibration mode by means of an excitation signal at a resonance frequency of the first anti-symmetrical vibration mode; - sensing (120) a vibration amplitude of the first anti-symmetrical vibration mode at the resonance frequency of the first anti-symmetrical vibration mode; - sensing (130) a time constant of a damped free vibration of the first anti-symmetrical vibration mode; and - determining (140) a modal elastic property of the oscillator with respect to the first anti-symmetrical vibration mode based on the vibration amplitude of the first anti-symmetrical vibration mode, the excitation signal and the time constant.

The present invention provides a liquid lens device capable of controlling the focal position without the need for mechanically moving parts. [Solution] A liquid lens device 1A comprising a case 2 having a cylindrical side wall portion 2a, a liquid lens 3 having liquid contained inside the side wall portion 2a, an annular ultrasonic transducer 4 positioned on the upper end side of the side wall portion 2a, and a drive control unit 5 that applies a voltage signal to the ultrasonic transducer 4, wherein visible light is transmitted through the case 2 and the liquid lens 3, the ultrasonic transducer 4 includes a plurality of transducer portions 4-1 to 4-8 divided in the circumferential direction, the drive control unit 5 applies voltage signals with different phases to the plurality of transducer portions 4-1 to 4-8, generates a traveling wave of flexural vibration propagating in the circumferential direction on the side wall portion 2a, propagates ultrasonic waves from the traveling wave into the liquid, and generates a swirling flow that flows in the circumferential direction in the liquid.

The method according to the invention serves to determine a mixture density measurement value ρ. m a gas-laden liquid using a Coriolis mass flow meter with a measuring tube for guiding the gas-laden liquid. The method comprises: determining (210) a mixture density start value based on at least one natural frequency of a bending vibration mode of the measuring tube; determining (220) a mass flow rate; determining (230) a gas volume fraction start value α s based on the initial mixture density value ρ s and a liquid density value ρ l ; Determining (240) a gas volume fraction final value α f based on the initial gas volume fraction value α s , and the mass flow rate; and (250) determining the mixture density value based on the liquid density value and the gas volume fraction final value α f .

A resonator is adapted to reduce or suppress forces transmitted from a vibrating part to a supporting part (Pf) of the resonator. To this end, the vibrating part comprises two extensions (P1, P2) each of which is shaped in such a way that two segments of each extension have respective velocity components oriented in opposite directions. Such a resonator, which is balanced, can advantageously be used in a gyro tester or a force sensor.

Vibronal measuring system, in particular a Coriolis mass flow meter or Coriolis mass flow / density meter, for measuring and / or monitoring at least one measured quantity, in particular a flow parameter, in particular a mass flow rate and / or a volume flow rate and / or a flow velocity, and / or a material parameter, in particular a density and / or a viscosity, of a fluid medium, in particular a gas, a liquid or a dispersion, which, in particular designed as an in-line measuring device and / or a compact measuring device, comprises: - a measuring transducer (10) -- with a pipe arrangement for guiding the flowing medium, -- mechanical power useful with an excitation arrangement for converting electrical power into the excitation and maintenance of forced mechanical vibrations of the pipe arrangement -- and with a sensor arrangement for detecting mechanical vibrations of the pipe arrangement and for providing vibration measurement signals representing the vibration movements of the pipe arrangement; - as well as a measuring system electronics (20) electrically coupled to the measuring transducer (10), namely both to its excitation arrangement and to its sensor arrangement, in particular by means of electrical connecting lines, in particular formed by means of at least one microprocessor and / or arranged in electronic protective housing, for controlling the measuring transducer and for evaluating vibration measurement signals supplied by the measuring transducer; - wherein the pipe arrangement comprises at least one, in particular at least partially curved and / or at least partially straight and / or first, pipe (111), -- which pipe extends from a first pipe end to a second pipe end with a pipe length, in particular more than 100 mm, and has a lumen enclosed by a pipe wall, in particular metallic, extending from the first pipe end to the second pipe end, -- and which pipe is set up to be flowed through by the measuring medium in at least one flow direction pointing from the first pipe end to the second pipe end and to be vibrated during this process, -- and wherein the tube possesses a plurality of vibration modes (natural modes) each having an associated resonance frequency (f1, f2, ... , fx), in which the tube can or does perform vibrational movements having one or more antinodes and two or more nodes, such that --- that the vibrational movements of the pipe in a fundamental vibration mode, namely a first-order vibration mode (f1-mode), in particular a first-order bending vibration mode, exhibit exactly one antinode and two nodes --- and that the vibrational movements of the pipe in a higher-order vibration mode, namely a second or higher order vibration mode (f2 mode, ... fx mode), in particular a second or higher order bending vibration mode, exhibit two or more antinodes and three or more nodes; - wherein the excitation arrangement includes a vibration exciter (31), in particular an electrodynamic one, -- mechanically connected to the pipe -- and is designed to convert electrical power into mechanical power using a time-varying electric current, such that a time-varying driving force acts on the pipe at a drive point formed by means of the vibration exciter on the pipe mechanically connected thereto, in particular such that a line of action of the driving force runs perpendicular to a normal of a driving cross-sectional area of ​​the pipe, -- wherein the vibration exciter (31) is positioned and aligned such that a drive offset (ΔE), namely a minimum distance between a drive cross-sectional area of ​​the tube enclosed by an imaginary circumferential line of the tube passing through the drive point and a predetermined reference cross-sectional area of ​​the at least one tube, determined in particular with an intact or original transducer, is no more than 3 mm, in particular less than 2 mm, and / or less than 0.5% of the tube length, in particular less than 0.2% of the tube length, in particular is zero with an intact or original transducer, wherein a vibration antinode formed between two antinodes of vibration movements of the at least one tube in a vibration mode (second or higher order) (deviating from the first order vibration mode), in particular(nominally) located at half a pipe length, vibration nodes of namely vibration movements lie within the reference cross-sectional area, . - and wherein the measuring system electronics (20) is configured to supply current to the vibration exciter (31), namely to supply electrical power to the vibration exciter (31) by means of an electrical driver signal (e1) having a time-varying electrical current, such that the tube performs forced mechanical vibrations, in particular bending vibrations, with one or more vibration frequencies specified by the driver signal (e1); - wherein the sensor arrangement includes a first vibration sensor, in particular an electrodynamic or optical one, -- which is positioned on the pipe, in particular at a distance of more than 10 mm and / or more than one fifth of the pipe length in the direction of flow, and in particular is at least partially mechanically connected to the pipe, is -- and which is equipped to detect vibrations of the pipe and to convert them into a first vibration measurement signal representing vibrations, in particular an electrical or optical signal, in particular such that the first vibration measurement signal contains one or more sinusoidal signal components, each with a frequency corresponding to a vibration frequency of vibrations of the pipe; - wherein the sensor arrangement includes at least one second vibration sensor, in particular an electrodynamic or optical one, -- which is positioned on the pipe, in particular more than 10 mm and / or more than one fifth of the pipe length away from the vibration exciter in the direction of flow and / or which is positioned away from the first vibration sensor in the direction of flow, in particular at least partially mechanically connected to the pipe, is -- and which is equipped to detect vibrations of the pipe and to convert them into a second vibration measurement signal representing the same vibrations, in particular an electrical or optical signal, in particular such that the second vibration measurement signal contains one or more sinusoidal signal components, each with a frequency corresponding to a vibration frequency of vibrations of the pipe; - and wherein the measuring system electronics are configured to receive and evaluate the first and second vibration measurement signals, in particular to determine and output the measured values ​​representing at least one measured quantity; - where the measuring system electronics are set up, -- to provide both the driver signal (e1) at least temporarily with a sinusoidal first (useful) current (eN1) having a first (alternating current) frequency, in such a way, --- that the tube performs at least partially, in particular predominantly, first useful vibrations, namely mechanical vibrations forced by the (energized) vibration exciter with a first useful frequency, namely a (vibration) frequency corresponding to the first (alternating current) frequency, in particular such that the first useful frequency deviates from a resonance frequency, f1, of the fundamental vibration mode by less than 1% of the same resonance frequency, f1, and / or by less than 1 Hz and / or that the first useful frequency deviates from a resonance frequency, f2, of the second-order vibration mode by more than 5% of the same resonance frequency, f2, and / or by more than 10 Hz and / or that the first useful vibrations are suitable to cause Coriolis forces in the flowing medium that depend on the mass flow rate, --- and that each of the first and second oscillation signals (s1; s2) has a first useful signal component (s1N1; s2N1), namely a sinusoidal signal component with a (signal) frequency corresponding to the first useful frequency, -- as well as on the basis of at least the first useful signal components (s1N1; s2N1), in particular on the basis of their (signal) frequency and / or on the basis of an amplitude of at least one of the first useful signal components (s1N1; s2N1) and / or on the basis of a phase angle of at least one of the first useful signal components (s1N1; s2N1), which represent at least one measured quantity, in particular mass flow values ​​representing the mass flow of the measured substance and / or density values ​​representing the density of the measured substance; - and where the measuring system electronics are set up, -- to provide both the driver signal (e1) at least temporarily, in particular during a test interval lasting more than 10 ms and / or limited in time and / or restarted repeatedly, with a sinusoidal second (useful) current (eN2) having a second (AC) frequency, in such a way, --- that the second (alternating current) frequency, in particular for two or more oscillation periods and / or a period of more than 10 ms, deviates from a resonance frequency, f2, of the second order oscillation mode by less than 1%, in particular by less than 0.1%, namely resonance frequency, f2, and / or by less than 1 Hz, in particular by less than 0.1 Hz, --- and that the pipe at least partially – in particular simultaneously with the first useful oscillations and / or stationary, namely for two or more oscillation periods and / or a period of more than 10 ms – performs second useful oscillations, namely mechanical oscillations forced by the (energized) vibration exciter with a second useful frequency, namely one corresponding to the second (alternating current) frequency, whereby each of the first and second oscillation signals has a second useful signal component (s1N2; s2N2), namely a sinusoidal signal component with a (signal) frequency corresponding to the second useful frequency, -- as well as on the basis of at least one of the second useful signal components (s1N2; s2N2), in particular on the basis of their (signal) frequency and / or on the basis of a (signal) amplitude of at least one of the second useful signal components (s1N2) and / or on the basis of a phase angle of at least one of the second useful signal component (s1N2), to carry out a (self-)diagnosis of the measuring system, in particular to check the functionality of the measuring system and / or to (re-)calibrate the measuring system and / or to determine whether there is a fault in the measuring system.

An ultrasonic tonometer includes an ultrasonic actuator having an ultrasonic element and configured to irradiate the subject eye with ultrasound generated by the ultrasonic element. The ultrasonic actuator includes: a sonotrode propagating ultrasound generated by the ultrasonic element into air; a flexural vibration portion disposed on a distal side of the sonotrode in an axial direction of the ultrasonic actuator; and a reflecting portion covering, with a gap with the flexural vibration portion, at least a part of the flexural vibration portion in a circumferential direction.

The utility model provides comprehensive test equipment for pressure resistance, alternating bending, vibration and impact of a pipeline. The comprehensive test equipment comprises a sample table and a butt-clamping follow-up sample seat, compared with the prior art, the sample holder has the advantages that through the matched arrangement of the butt-clamping follow-up sample holder, the sample holder body, the follow-up shaft, the manual clamping wheel, the clamping wheels, the follow-up bearing, the positive and negative screw rod and the nuts, the manual clamping wheel is rotated, the positive and negative screw rod rotates, the nuts are driven to be close to each other, the clamping wheels are close to each other, samples are clamped, and the sample holder can adapt to clamping and fixing of samples of different sizes; the adaptability is high, the device can be used for positioning and detecting samples with different sizes, and the use is flexible; according to the testing machine, a servo control system is adopted, axial reciprocating vibration displacement can be achieved, the vibration frequency range is 0-20 Hz, and the amplitude is adjustable in the range of-5 mm to + 5 mm. A plunger type high-pressure pump or a high-pressure air pump is adopted to provide stable pressure, and the pressure efficiency is high and the stability is good. The device is wide in measurement range, high in precision, flexible and convenient to use and fatigue-resistant.