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276results about How to "Will not change" patented technology

Doppler distorted acoustic signal correction method based on microphone array

The invention discloses a Doppler distorted acoustic signal correction method based on a microphone array. The Doppler distorted acoustic signal correction method can correct Doppler distortion in the acoustic signal detected by a rail edge acoustic diagnosis system, and accurate diagnosis of train bearing faults can be achieved. The Doppler distorted acoustic signal correction method comprises carrying out Hilbert transformation to a detection signal, obtaining a complex signal, windowing the complex signal, obtaining a signal segment, calculating the acceptance angle corresponding to each signal segment, constructing a resampling time sequence in dependence on the relationship between the emission time and the reception time, carrying out cubic spline difference value resampling to a signal acquired a microphone in the center of the array, carrying out Hibert transformation and fast Fourier transform to a correction signal, and carrying out diagnosis. Compared with a conventional method based on a single microphone, the Doppler distorted acoustic signal correction method based on the microphone array is advantaged in that the algorithm is simple, the calculated amount is low, prior knowledge is not needed, noise robustness is good and the like, and the Doppler distorted acoustic signal correction method has obvious advantages in practical application.
Owner:UNIV OF SCI & TECH OF CHINA

Method and device for purifying refined aluminum and high-purity aluminum through continuous segregation

The invention relates to a method and a device for purifying refined aluminum and high-purity aluminum through continuous segregation and belongs to the field of casting metallurgy. The method and the device for purifying the refined aluminum and the high-purity aluminum through the continuous segregation are characterized in that crystallization of the refined aluminum and the high-purity aluminum is finished in flowing molten aluminum, the method and the device rely on a liquid supply system of production lines including a continuous casing production line, a continuous rolling production line and the like which need continuous liquid supply, the molten aluminum is from molten aluminum flowing out of a standing furnace, the flowing molten aluminum continuously provides a purification raw material, and continuous high-purity aluminum production is really achieved through the match of the method, the device and a rolling wheel crystal-pulling device. By means of the method, a stirring system is not required in the whole purification process, the energy consumption in the heat preservation process is reduced greatly, purified molten aluminum has no influence on follow-up production activities, the flowing molten aluminum enables the stability of purification raw material components to be ensured, and the uniformity of product components is ensured well under a certain process condition. The method greatly improves the production efficiency and simultaneously reduces the energy consumption, and a directional solidification and purification process is not influenced by the atmosphere environment inside a furnace.
Owner:KUNMING METALLURGY INST

Miniature wing surface electric heating deicing system icing wind tunnel test device

The invention discloses a miniature wing surface electric heating deicing system icing wind tunnel test device. A miniature wing sample, fastening nuts and self-locking pads are cooperatively arranged between the two side walls of an icing wind tunnel through a connecting rod and a hollow connecting rod, a rocking arm, a Z-shaped pointer, and a handle are arranged at the outer side of the icing wind tunnel at the side of the connecting rod, a corner scale is marked on the outer wall surface of the side wall of the icing wind tunnel, and the upwind angle of the miniature wing sample can be conveniently adjusted at the beginning of the test and in the process of the test according to the test requirement. The connecting rod and the hollow connecting rod are provided with the fastening nuts, the relative position of the miniature wing sample in the icing wind tunnel can be adjusted through the fastening nuts, the self-locking pads are arranged on the connecting rod and between the fastening nuts and the side walls of the icing winding tunnel, and the relative position of the miniature wing sample can be fixed after the nuts are fastened. The connection manners of the components can guarantee the axis of the rocking arm and the indicating section of the Z-shaped pointer to be parallel to the string of the miniature wing sample, so that the indicating angle of the Z-shaped pointer, namely, the upwind angle of the miniature wing sample can be guaranteed, and the accuracy of the angle readings can be guaranteed.
Owner:NORTHWESTERN POLYTECHNICAL UNIV

Deep sea extreme environment simulation system

The invention relates to a deep sea extreme environment simulation system. The deep sea extreme environment simulation system comprises a Raman reaction chamber, a sample injection supercharging device, a Raman spectrum collecting system and a temperature control device. The Raman reaction chamber comprises a chamber body, a chamber cover and an immersed type Raman probe. A sample injection supercharging channel is formed in the chamber body, the sample injection supercharging channel is connected with the sample injection supercharging device, the chamber cover is movably connected to the topof the chamber body, the immersed type Raman probe is fixed to the upper portion of the top of the chamber body through the chamber cover, the immersed type Raman probe is connected with the Raman spectrum collecting system, and the front end of the immersed Raman probe extends into the chamber body. The deep sea extreme environment simulation system is simple in structure, high in stability, andhigh in high temperature resistant and corrosion resistant ability, can remain the state of high temperature and high pressure for a long time, and can achieve simulation of the deep sea extreme environment at the pressure of 0-60MPa and at the temperature of 0-450 DEG C. The Raman spectrum collecting system with the long-term continuous monitoring function achieves real-time control over the ingredients and the concentration of a sample in the chamber, and the deep sea extreme environment simulation system can be widely applied to simulation of extreme environments such as deep sea hydrothermal solutions and cold springs.
Owner:INST OF OCEANOLOGY - CHINESE ACAD OF SCI

A capacitive contact-type displacement measurement sensor and sensing system

The invention provides a capacitive contact-type displacement measurement sensor and sensing system. The sensor comprises a fixed part and a moving part. The fixed part comprises a fixed insulation substrate and a capacitance electrode piece group fixed on the fixed insulation substrate, wherein the capacitance electrode piece group comprises conductive electrode pieces and fixed side thin film covering each conductive electrode piece. The moving part comprises a moving insulation substrate and a grounding electrode piece group located on the moving insulation substrate, wherein the grounding electrode piece group comprises conductive electrode pieces and moving side thin film covering each conductive electrode piece; the fixed part and the moving part are arranged to be opposite each other in a Z direction perpendicular to an X direction and the moving part and the fixed part are in contact-type sliding fit connection in the X direction so that the moving side thin film and the fixed side thin film can maintain zero clearance in the Z direction; the capacitance electrode piece group and the grounding electrode piece group can form a variable capacitor in a moving process. The sensor has the advantage that there is no need to perform compensation design for clearance changes, so that the structure can be simplified and the performance of the sensor can be improved.
Owner:TSINGHUA UNIV +1
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