284 results about "Strain type" patented technology

The strain-type flexible respiration transducer for electronic fabric includes transducer sensing element in the form of fabric comprising elastic conducting fiber and insulating fiber, and the transducer sensing element has lead or joint for electric connection. The clothing with the respiration transducer for monitoring the respiration of the human body is one maillot with at least one of this flexible respiration transducer in the chest part. The flexible respiration transducer and the clothing with the flexible respiration transducer may be bent, folded, kneaded and washed, are suitable for monitoring the respiration information in the worn state, and have simple structure, low cost and convenient use.

The invention provides a strain type force measuring device, more particular a sensor capable of simultaneously measuring component forces of a non-coplanar force at 6 different degree-of-freedom directions. Flanges (2) are arranged at the two ends of a thin-walled cylinder (1) and opened with mounting holes (3), an electric resistance strain gage and a temperature compensation strain gage are adhered on a specific position of the wall of the thin-walled cylinder (1) with a specific manner, and the electric resistance strain gage is bridged. The invention has the advantages of uniform radial mechanical properties, good longitudinal stability, simple structure, light weight, low inertia, no intervals and frictional force, high measurement accuracy and wide application range; and is suitable for measuring either small load and high load with large structure.

The invention discloses a strain type wireless sensor, comprising a strain measuring circuit module, a rotating speed measuring module, a data processing module, a wireless communication module and a power supply module, wherein an internal-arranged strain bridge is connected with a strain sheet which is mounted on an external transmission shaft through a lead wire so as to receive analogue voltage information output by strain bridge resistance variation which is caused by deformation of the strain sheet, and a voltage strain signal is output after the analogue voltage information is processed; the rotating speed measuring module is arranged at a position to be aligned to the rotating speed measuring module, is located in a magnetic field at a static state, and is used for outputting pulse voltage information; the data processing module is used for counting the pulse voltage information received within a time unit and converting the pulse voltage information into rotating speed information; the rotating speed information and a received voltage strain signal are output to the wireless communication module after being packaged; received information is sent in a wireless manner by the wireless communication module; and the power supply module supplies power to the strain measuring circuit module, the rotating speed measuring module, the data processing module and the wireless communication module. With the adoption of the strain type wireless sensor, the torque and the rotating speed can be measured simultaneously.

The invention provides a battery pack abnormality detecting device and a battery pack abnormality detecting method, belonging to the field of electric vehicles. The battery pack abnormality detectingdevice comprises an air pressure sensor, a strain type pressure sensor and a processor, wherein the air pressure sensor and the strain type pressure sensor are located in a battery pack; the air pressure sensor is connected with the processor and used for detecting air pressure in the battery pack; the strain type pressure sensor is connected with the processor and used for detecting the pressureof the inner wall of the battery pack; and the processor is used for determining whether the battery pack is abnormal or not on the basis of a first pressure value collected by the air pressure sensorand a second pressure value collected by the strain type pressure sensor, and generates first alarm information under the condition that the battery pack is determined to be abnormal. According to the invention, sensors are placed in the battery pack, so the alarm information generated by the processor on the basis of output pressure data can truly reflect whether the battery pack is really abnormal or not, and detection accuracy is improved.

The invention belongs to the metallurgical equipment field, which relates to a testing system for an impact force of a secondary cooling nozzle of a slab caster. The invention is characterized in that a waterproof strain type micro force value sensor (8) is fixed on a sensing shift mechanism, the waterproof strain type micro force value sensor (8) is driven to shift to a testing position through the sensing shift mechanism, a nozzle is fixed on a nozzle shifting mechanism, a nozzle (3) is arranged downwards, the nozzle (3) is shifted to the upper portion of the waterproof strain type micro force value sensor (8) through the nozzle (3) shifting mechanism, the nozzle (3) sprays water, the waterproof strain type micro force value sensor (8) is driven to shift through the sensing shift mechanism, a strain type electric signal is produced by a spraying percussive force in different space which is given by the waterproof strain type micro force value sensor (8), the signal is amplified through a signal conditioner 10, a data which is output by the signal conditioner 10 is transmitted to a data collecting and analyzing unit (11) of a computer, and an inundation distributing graph of three-dimensional water spraying percussive force is given. The invention can accurately measure the percussive force characteristics of a nozzle, which improves measuring accuracy, and reduces measuring cost.

The invention provides a pressure sensor based on MEMS. The pressure sensor based on MEMS comprises a base, a lower cover, a support, a pressure-sensitive core, an insulating pad, a signal processing circuit board, a shell, an electric connector and a lead board. The pressure-sensitive core is based on the sputtered film strain type principle and used for sensing pressure of a medium to be measured and outputting electric signals in proportion to pressure signal changes. A signal processing circuit is a highly integrated sensor signal processing circuit and used for supplying power to the pressure-sensitive core and meanwhile amplifying, calibrating and performing temperature compensation on signals output by the pressure-sensitive core, so that high-precision signal conditioning is achieved. The base and the shell provide connectors to pipelines and used for packaging the pressure-sensitive core and the signal processing circuit board. The pressure sensor is of an integrated structure, high in reliability, small in size, light in weight and suitable for accurately measuring the pressure of a high pressure gas cylinder of a small ultrahigh-pressure cool air propulsion system.

The invention discloses a strain-type intelligent tool handle system for two-dimensional milling force monitoring. The system is mainly composed of a standard tool handle, a circuit carrier, a sealing cover, a power supply module, an acquisition and emission module, and a strain sensor. When the system is working, The circuit carrier, sealing cover, power module, acquisition and emission module, and strain sensor rotate together with the standard tool handle. The power supply module supplies power to the strain sensor and the acquisition and emission module. The Wifi transmission method is transmitted to the host computer terminal for processing and display. The present invention adopts the monitoring scheme of strain sensor, signal collection and transmission assembled on the standard tool handle, which makes little change to the structure of the original tool handle, does not affect the installation and use of the tool and the grasping of the manipulator, and has the advantages of simple structure and strong practicability, etc. It is especially suitable for the cutting of large parts or heavy cutting conditions, which solves the problem that the dynamometer is limited by the size of the parts.

A strain type rockburst early warning method based on acoustic signal spectral analysis includes the following steps: acoustic signal acquisition equipment is utilized to acquire acoustic signals in a strain type rockburst destruction process in real time, the acquired acoustic signals are transmitted to an acoustic signal processing system, and are recorded and analyzed in real time; denoising processing is performed on the acquired acoustic signals first, and then spectral analysis is performed in real time on the acoustic signals after denoising, thereby obtaining an amplitude spectrogram of the acoustic signals; whether the development tendency of strain type rockburst exists is judged by analyzing spectrum characteristics of the acoustic signal, and if ''wideband low-amplitude and multi-peak'' acoustic signals appear later, that a strain rockburst disaster is very likely to happen is predicted, and the acoustic signal processing system gives an alarm at a server terminal. The strain type rockburst early warning method based on acoustic signal spectral analysis belongs to a non-contact real-time monitoring means, and has the advantages of remote controllability, safe installation operation, and reliable and stable signals.

The invention discloses a resistance strain diameter measuring device and a use method thereof. The resistance strain diameter measuring device comprises a resistance strain sensor with a pair of blades and twin cantilever girders, a U-shaped supporting saddle and a resistance strain measuring apparatus. The U-shaped supporting saddle is used for supporting the sensor and providing the locating restriction of a test sample, a cylindrical guide rod is horizontally arranged on the U-shaped supporting saddle, and a locating marble or a V-shaped slot are arranged on the top of the U-shaped supporting saddle. The sensor can be moved on the guide rod, a guide limiting slot is arranged at the bottom of the guide rod, a guide limiting pin is arranged at the bottom of the sensor, and the guide limiting slot and the guide limiting pin are combined, thus leading the blades of the sensor to be located right above the guide rod and rotate around the axial line of the guide rod by small angles; when measuring, the test sample is automatically located between the blades due to self gravity, the cantilever girders are led to generate deflection deformation, and the resistance strain measuring apparatus displays and records the diameter value of the test sample. The resistance strain diameter measuring device of the invention has simple structure, convenient use, high precision and good repeatability, can be conveniently used on line with computers, and consequently is suitable for the digitalizing development requirements of measuring techniques.

The invention provides a test device and method for assessing a non-smooth surface anti-drag effect. The device comprises a slab model, a strain type balance supporting force transmission rod, a force measurement element and a laser vibration measurement instrument. The slab model is hung in a water tunnel formed by the water tunnel side wall and the water tunnel bottom wall through steel wire ropes. The lengths of all the steel wire ropes are the same. The tops of the steel wire ropes are at the same height. The strain type balance supporting force transmission rod is vertically arranged in the water tunnel which contains liquid. The front end of the slab model is in contact with the strain type balance supporting force transmission rod. The force measurement element is arranged on the strain type balance supporting force transmission rod. When liquid is static, the reading of the force measurement element is zero. The laser vibration measurement instrument is arranged facing the steel wire ropes. Laser light paths generated by the laser vibration measurement instrument are parallel to the slab model which comprises a smooth surface slab and a non-smooth surface slab to be assessed. According to the test device and method, the test principle is simple, the evaluation method is visual, test results are reliable, and operation is convenient.

The invention provides a high-precision strain type torque sensor which comprises two changeover plates (1), four strain columns (2), strain pieces (3), a dynamic strain meter (4) and a data acquisition and processing system (5). The four strain columns (2) and the upper and the lower changeover plates (1) are fixed. The strain columns (2) are of square column structures, each strain column is provided with two semi-circular grooves, the strain pieces (3) are pasted on the backs, above the semi-circular grooves, of the two symmetrical strain columns (2), and the four strain pieces (3) are pasted totally. In the testing process, one changeover plate (1) is fixed, a vibration source is arranged in the center of the other changeover plate (1), and four kinds of strain generated by the four strain pieces (2) form a full-bridge. The dynamic strain meter (4) converts the strain generated by the strain pieces (3) into dynamic voltage signals. The data acquisition and processing system (5) collects the dynamic voltage signals, and torque is obtained according to the dynamic voltage signals.

The invention discloses an ultra-low frequency high-accuracy micro-vibration measuring system which is composed of a base, four adapter blocks, four strain-type force sensors, a load disc, a dynamic strain indicator, 48 strain gages and a data collecting and processing system. The strain gages are pasted on the strain-type force sensors. The strain-type force sensors are located between the load disc and the adapter blocks and are connected between the load disc and the adapter blocks in a tightened mode through bolts. The adapter blocks are located on the side surface of the base and connected with the side surface of the base in a tightened mode through bolts. Three dynamic forces and three dynamic force moments of a disturbance source are measured through the fact that the strain gages pasted on the strain-type force sensors are reasonably combined and connected with the dynamic strain indicator to form 12 full bridge circuits. The disturbance source can be installed inside the measuring system and can also be installed outside the measuring system. The strain gages are connected with the dynamic strain indicator through wires. The dynamic strain indicator is connected with the data collecting and processing system through a wire. The ultra-low frequency high-accuracy micro-vibration measuring system can accurately measure the vibratory force and the vibratory force moment of a tiny disturbance source, the measured frequency range is accurate to 0Hz, and the measuring reliability is high.

The invention discloses a method for determining a paste position of a strain gauge of a sensor. The method comprises the following steps: carrying out gridding treatment on an elastomer of a strain type sensor to divide the elastomer into a plurality of units; applying a vertically downward positive pressure to the elastomer to cause the elastomer to deform; measuring the unit deformation amount of the elastomer; and determining the paste position of the strain gauge of the strain type sensor according to the deformation amount. By adopting the embodiment of the invention, the measurement precision of the strain type sensor can be improved.

The invention discloses a strain type six-dimensional force transducer including a bottom cover, a base, a circuit board, elastic bodies, and a top cover. The bottom cover is connected with the bottom surface of the base, the circuit board is arranged inside the base, the four elastic bodies are uniformly distributed in the base, the outer side ends of the sensing elements of the elastic bodies are connected with the base, the inner side ends of the sensing elements of the elastic bodies are connected with the top cover, and the top cover is supported on the base through the elastic bodies. The strain type six-dimensional force transducer can better eliminate the inter-dimensional coupling due to the adoption of the plurality of elastic bodies and reasonable strain gauge bridge scheme design, and the strain type six-dimensional force transducer can have high rigidity and good sensitivity through the elastic bodies in a special structure.

A novel resistance strain type earth pressure cell sensor comprises an earth pressure cell side wall and an earth pressure cell end cover, wherein the earth pressure cell side wall is fixed to the earth pressure cell end cover, a stress film is arranged at one end of the earth pressure cell side wall, and an annular resistor strain gauge is arranged on the bottom surface of the stress film. The sensor further comprises an outer cover and a rubber force transmission block, wherein the earth pressure cell side wall is sleeved with the outer cover, and the rubber force transmission block is arranged between the bottom surface of the outer cover and the stress film. The novel resistance strain type earth pressure cell sensor is high in sensitivity and easy to calibrate.

The present invention relates to a temperature compensation method for strain-type weighing sensor. Inside or near the weighing sensor, a temperature sensor is installed, the temperature sensor is calibrated in zero point temperature-zero point output and temperature-elastic modulus, and zero point temperature-zero point output curve and temperature-elastic modulus curve are created in the weighing display. The operation includes first zero point temperature compensation based on the zero point temperature-zero point output curve in the weighing display, the elastic modulus compensation based on the temperature-elastic modulus curve, and final converting the measured weight into true weight based on the weight reference calibration value in the weighing sensor.

The invention relates to a strain type lateral expansion force testing device and a measuring method. The strain type lateral expansion force testing device comprises a measuring device, a data collecting device and a loading device. The measuring method comprises the following steps of performing water soaking expansion testing on specimens with same initial wet density states under non-load andnon-lateral strain conditions, and obtaining the expansion limit water content and corresponding dry density of the specimens with same initial wet density states under the condition of stable expansion; performing gradual loading type cementing testing on the specimens with same initial wet density states under the conditions of expansion limit water content and corresponding dry density, measuring the lateral pressure coefficient K0 at different dry densities, and stripping the lateral expansion force from the lateral resultant force. The strain type lateral expansion force testing device and the measuring method have the advantages that the testing method and the device are simple, the operation is convenient, the structure is reasonable, and the manufacturing cost is economical; the problem of stability of expanded soil edge slope after wetting expansion in the long-time expected precise evaluation process of the field is solved, the important design parameters are provided for thedesign of engineering structures and wall back buffer layers in the expanded soil area, and the device and the method are suitable for being popularized and applied in engineering.

The invention provides a strain type rockburst early warning method based on acoustic signal waveform change characteristics. The method includes the following steps: acoustic signals in a strain type rockburst destruction process are collected and transmitted to an acoustic signal processing system, the acoustic signal processing system performs denoising processing first, and then draws and analyzes an acoustic signal oscillogram, main forewarning information of occurrence of rockburst is that after small-amplitude fluctuation of the amplitude of the acoustic signals for a relatively long time, high-amplitude acoustic signals suddenly appear for a short period of time, and soon afterwards, a ''relative quiet period'' of continuous low-amplitude acoustic signals appear; a curve of a time fractal dimension value changing with time is drawn, another piece of forewarning information of occurrence of rockburst is that after continuously increasing to a relatively large value, the value of the time fractal dimensions D<t> continuously declines in a period of time and approaches a historical minimum value; and finally, an alarm is given in the form of sending out high-decibel sound or changing screen graphics. The strain type rockburst early warning method based on acoustic signal waveform change characteristics belongs to a non-contact monitoring means, and has the advantages that the installation operation is safe and the signals are reliable and stable.