40results about "Analysing solids using sonic/ultrasonic/infrasonic waves" patented technology

Disclosed herein is a scanning device for performing ultrasonic nondestructive testing of a tube, comprising a housing; the housing having bottom surface that is concavely curved with cavities to accommodate a waveguide assembly and an encoder assembly; where the waveguide assembly comprises a waveguide and a probe that are in communication with one another; the waveguide having at least one surface that is contoured to match an outer surface of the tube; where the waveguide facilitates the transmission of ultrasonic signals into the tube generated by the probe; and where the encoder assembly comprises a spring loaded wheel that contacts the tube; and where the encoder assembly provides a signal indicative of a location of the probe relative to a position on the tube as the scanning device is moved in a direction of a longitudinal axis of the tube.

The invention discloses a ground empty drum knocking device for engineering technology detection. The ground empty drum knocking device comprises a supporting plate, a driving motor, a worm, a knocking hammer and a rotary disc, wherein the two sides of the bottom of the front of the supporting plate are respectively and rotatably connected to driven wheels; the two sides of the bottom of the backof the supporting plate are respectively and rotatably connected to driving wheels; a driving motor is fixedly arranged on the top of the back of the supporting plate; the output end of the driving motor is rotatably connected to the worm; a bearing at the end of the worm is rotatably connected to a bracket; the top of the front of the worm is meshed with a first worm wheel; the first worm wheel is rotatably connected to the upper end of a holder; the upper end of the bracket is rotatably connected to a residual gear; the residual gear is connected to the first worm wheel through a synchronousbelt I, partially has teeth and partially has no teeth; a part of the residual gear with the teeth is meshed with a rack plate; the rack plate is fixed to the side surface of an expansion link; the expansion link is a square link; a square sleeve for passing of the expansion link is fixed to the surface of the supporting plate; the knocking hammer is fixedly connected to the lower end of the expansion link; a sleeve is nested on the upper part of the expansion link; a spring is fixed inside the sleeve; and the lower end of the spring is fixed to the upper end of the expansion link.

A method is provided for detecting a perturbation with respect to an initial state, of a device comprising at least one resonant mechanical element exhibiting a physical parameter sensitive to a perturbation such that the said perturbation modifies the resonance frequency of the said resonant mechanical element. A device is provided for detecting a perturbation by hysteretic cycle comprising at least one electromechanical resonator with nonlinear behaviour and means for actuation and for detection of the reception signal via a transducer so as to analyse the response signal implementing the method. A mass sensor and a mass spectrometer using the device are also provided.

Disclosed is an apparatus that transmits an elastic wave to an object and receives a reflected wave, this apparatus including: a transmitting and receiving unit having elements for converting an elastic wave to an electric signal, and being arranged at least in one direction; an element controlling unit that inputs an electric signal to the element and causes the element to transmit an elastic wave; and a detecting unit that detects a reflected wave to be received by the element, wherein the electric signal to be inputted to the element is an encoded pulse signal encoded among the elements, and the detecting unit decodes the reflected wave and executes at different time points aperture synthesis processing of synthesizing the decoded reflected wave with respect to the intersections of two axes at different time points.

A contact type rolling machine integrated compaction sound wave detection system comprises a sound emission sensor, an industrial personal computer, a data acquisition instrument, a GPS / BDS receiver and the like, when a filling layer is rolled, a sound wave field time domain signal formed near the rolling layer is received by the sound emission sensor vertically installed on a support directly connected with a vibration wheel, and a sound wave field digital signal is formed through sampling; meanwhile, the GPS / BDS receiver provides a space signal related to a rolling position, filtering and spectral analysis are carried out on the sampled sound wave signal, an effective sound signal harmonic amplitude is obtained, a contact type sound compaction index is established according to the correlation between the amplitude ratio and the compaction degree of the filling material, and a space-time compactness distribution diagram of a rolling area is displayed on an airborne display in combination with GPS space position information. The system has the advantages of being accurate, continuous, real-time, small in discreteness, low in cost and the like and is suitable for continuous compaction quality control of filling materials, and the intelligent continuous compaction function can be easily achieved by controlling operation parameters of the rolling machine through compaction degree feedback.

The invention discloses a method used for obtaining the service life and the reliability of a high-temperature high-pressure component by utilizing ultrasonic, belonging to the technical field of high-temperature component service life prediction. The method is characterized by comprising the steps of obtaining the ultrasonic velocity V1 in the material to be detected by using an ultrasonic apparatus; according to the ultrasonic velocity V1, obtaining a material damage state parameter Dv, and further obtaining a mean value * of the deviation of high-temperature permanent properties of the damaged material; and according to * is equal to A plus f (P (tr, T)) minus log (Sigma), calculating the service life tr of the component under the set temperature t and the stress Sigma, wherein A is a permanence property distribution parameter and obtained by the following formula: R is equal to Phi (A / s), wherein R is the selected reliability, Phi (A / s) is a normal distribution function, and s is distribution variance. The invention has the beneficial effects that the method not only can determine the service life of the high-temperature high-pressure component under the set reliability, but also can be used for determining the service reliability of the high-temperature high-pressure component under the set temperature, stress and service time.

The invention discloses a maintenance system for gear flaw detection. The system comprises a base, a case and a flaw detector, the case is fixedly mounted at the upper end of the base, a PLC is fixedly mounted on one side of the outer wall of the base, a box door is hinged to one side of the outer wall of the machine box, a first motor and two bearing seats are fixedly installed in one side of thebottom end in the machine box, a threaded rod is rotatably installed between the two sets of bearing seats, a threaded sliding seat is installed on the outer portion of the threaded rod in a threadedmode, and a supporting rod is fixedly installed at the upper end of the threaded sliding seat through a containing and carrying plate. According to the invention, a driving gear is installed, staticnondestructive flaw detection operation can be carried out on the gear, hidden structural dangers existing in gear production and machining can be found in time, structural flaw detection operation can be carried out on the gear under the dynamic operation condition, and therefore the stress and deformation conditions of the gear structure under the operation state can be mastered, and the detection effect is effectively improved.

The invention discloses an IGBT module bonding wire fracture detection method based on ultrasonic reflection. The IGBT module bonding wire fracture detection method comprises the following steps of S1, building a data acquisition platform, S2, collecting ultrasonic reflection output signals of an IGBT module with the same specification as the target IGBT module under different bonding wire breakage conditions, and performing frequency domain transformation, S3, according to the collected signal data, establishing a database of the relationship between the target IGBT module bonding wire fracture number and the ultrasonic reflection output frequency domain signal, and S4, acquiring an ultrasonic reflection output signal of the target IGBT, comparing the ultrasonic reflection output signal in the established database, and judging the number of broken bonding wires of the IGBT. Ultrasonic reflection is adopted to detect the bonding wire fracture condition of the IGBT module. Compared withother existing detection methods, ultrasonic reflection is used for detecting the bonding wire breakage condition of the IGBT module, and the method has the advantages that the cost is low, the precision is high, and the detection process does not depend on the working point of the IGBT.

The invention discloses a manual ultrasonic detection device for large pipe diameters. The manual ultrasonic detection device comprises an ultrasonic phase control array detector, a creeping wave probe and a mounting rack, wherein the creeping wave probe is mounted on a creeping wave probe wedged block; the ultrasonic probe of the ultrasonic phase control array detector is mounted on an ultrasonicprobe wedged block; the ultrasonic phase control array detector is connected with the creeping wave probe and the ultrasonic probe through data wires; the mounting rack consists of a limiting rod andtwo pressing rods; one ends of the two pressing rods are hinged together; the other ends of the pressing rods are respectively hinged to the creeping wave probe wedged block; the ultrasonic phase probe wedged block is fixed on the limiting rod; and the limiting rod is arranged between the two pressing rods in a sliding manner. The manual ultrasonic detection device for large pipe diameters, whichis disclosed by the invention, is simple in structure, simple to operate and high in detection rate.

The invention relates to a vehicle sound absorption and insulation performance tester which comprises a data processor and first and second data collectors. The first data collector is mounted in an engine during use, the second data collector is mounted in a compartment during use, both the first and second data collectors are in communication connection with the data processor, and each data collector comprises a sound pressure measuring probe. The tester can measure the sound insulation effect of the whole vehicle, can move with the vehicle, and measures sound absorption and insulation performances of the vehicles in different conditions of practical operation, and a measurement result can be used to reflect the practical sound insulation effect of the vehicle more.

The invention discloses a lightweight high-density road surface performance detection method. The method comprises the steps: installing a road surface detector in a to-be-detected area, starting a telescopic device of the road surface detector, driving a knocking hammer to knock a to-be-detected road surface, acquiring and recording a knocking sound frequency by an audio collector, according to the received knocking sound frequency, starting a pressurizing pump to inject quantitative water into a pressurizing cylinder, reading and metering road surface water seepage time, and calculating a road surface water seepage coefficient; starting a high-pressure air pump to inflate pressure gas into the pressurizing cylinder, observing and detecting whether water leaks from the road surface or not within a time interval, recording the pressure of the pressure gas when water leaks, and judging whether the water seepage performance of the road surface is qualified or not; and judging whether the road surface compactness, the structural strength, the road surface water permeability coefficient and the road surface water permeability performance are qualified or not by testing the knocking frequency, the pressurized water permeability test and the pressurized gas permeability test. The road is not damaged in the test, and the test is convenient and rapid.