34 results about "Strain gauge transducer" patented technology

The invention relates to a soil and rock mechanics feature test multi window data acquisition device. Four strain gages are sticking on the rock sample to form full bridge or half bridge output circuit that has four switches K1-K4. The output of every two bridge output circuit connects to the input end of an amplifier (5, 6). And the output end connects to the input of MCU (7). Two pressure sensors (8, 9) connect to power ground and connect to MCU (7). The displacement sensor connects to data working up chip (37) and signal transforming chip (18), which connects to signal transforming chip (20). The chip (20) connects to MCU (11). And MCU (11) connects to integration block (10) that is connected to 20 LED and key board, MCU (7), and MCU (12). MCU (11) and MCU (12) connect to LCD. The 20 LEDs forms four display window that each has five LEDs.

The invention discloses a plunger pump rotating speed measuring method and device. The device can comprise a strain gauge sensor, wherein the strain gauge sensor is located on a hydraulic pipeline connected with the output end of a plunger pump; a data acquisition module which is used for acquiring a measurement signals on the strain gauge sensor when the plunger pump outputs pulsating fluid to ahydraulic pipeline; and a signal processing module which is used for determining the pulsation frequency of the pulsating fluid in the hydraulic pipeline on the basis of the energy spectral density ofthe measurement signals and determining the rotating speed of the plunger pump on the basis of the pulsation frequency.

The invention provides an online testing scheme of pantograph-catenary contact force. Firstly, an experimental model is established; sensors are arranged at intervals along the Y-axis direction on the bow reed on the back of the pantograph, a clamp is set up on the slide plate and then a weight is hung in the center of the clamp. Record the grating wavelength of each measuring point in real time; obtain the static contact force change rule under different loads during static loading; then arrange the optical fiber strain gauge sensor on the bow reed, and arrange a high-speed camera in front of the pantograph to obtain the static contact force; through The unidirectional acceleration sensor first calculates the inertial force of the pantograph head to calculate its dynamic contact force online. The present invention proposes a scheme of installing a strain sensor at the reed of the bow head, which can not only obtain higher sensitivity, but also avoid the influence of regular replacement of the slide plate. Using the optical digital speckle correlation method, the direct measurement of the contact point position at any time during the loading process can be realized ， Combined with the strain value of the measuring point, the contact force can be directly reversed without simplifying the physical structure of the slide.

The invention discloses a measurement system and method for obtaining the natural frequency of a cycloid wheel of a reducer under different working conditions, including a fine-tuning displacement mechanism, a magnetic torque motor power device, a special pin gear housing for detection, an acceleration sensor, a strain gauge sensor, a sensor, The exciter, vibrometer and measurement and control system, the power device of the magnetic torque motor and the exciter are relatively arranged on the fine-tuning displacement mechanism, the power device of the magnetic torque motor is connected with the cycloid wheel to be detected, and the acceleration sensor is arranged on the cycloid wheel to be detected On the outer surface, the strain gauge sensors are respectively set at the tooth roots of the cycloidal wheel to be tested and the special pin gear housing for testing. On one side of the wire wheel, the force sensor is arranged at the front end of the exciter; the measurement and control system is respectively connected with the acceleration sensor, the strain gauge sensor, the exciter and the vibration measuring instrument. Realize the online rapid measurement of the natural frequency of the cycloid wheel vibration of the reducer under different working conditions, with high measurement accuracy and simple operation.

The invention provides an axial force measuring system for a turbocharger. The system comprises a combustion system, a lubricating oil system, a data control and acquisition processing system, an external pipeline auxiliary system, and sensors. The combustion system includes a fuel supply system and a combustion chamber connected with an external gas source. The lubricating oil system includes a lubricating oil box connected with a turbocharger by a pipeline. The sensors that are arranged inside a work device on a pipeline separated by the work device inside the turbocharger consists of a pressure sensor, a temperature sensor, a flow sensor, a rotating speed sensor, and strain gauge sensor. The external pipeline auxiliary system enables a gas circuit and an oil circuit to be connected. The data control and acquisition processing system is used for collecting sensor data and processing and outputting the data. In addition, the invention also relates a testing method. An all-condition condition can be simulated for testing; and testing not only can be realized on the measuring system but also can be realized on an engine. The system and method have advantages of good visual effect and high accuracy and sensitivity.

The present invention is applicable to the technical field of wind speed and direction detection, and provides a wind speed and direction testing device and a testing method. The wind speed and direction testing device includes: a test head, a support rod, at least two strain gauge sensors, a temperature sensor, a barometer and a main control plate. Wherein, the test head is a cylinder, and when the wind blows to the surface of the test head of the cylinder, the test head of the cylinder will produce regular strain, and the strain reflects the speed and direction of the wind flow. At least two strain gauge sensors are set on the test head to detect the strain on the cylinder test head, and the main control board can determine the current wind speed and wind direction according to the strain, current temperature and current pressure detected by at least two strain gauge sensors . The device does not need to be equipped with mechanical parts, and has the advantages of sensitive response, high testing precision and small error.

The invention discloses a vehicle rollover safety situation evaluation system based on an intelligent terminal, which comprises a vehicle situation data acquisition module, a vehicle situation information processing module, a vehicle situation data transmission module and a vehicle situation risk decision-making module connected in sequence. In the present invention, the vehicle situation risk decision-making module is implanted into the Android system or the iOS system intelligent terminal, and the strain gauge sensor in the vehicle situation data acquisition module obtains the strain of the vehicle leaf spring, calculates the vehicle LTR and TTR values, and monitors the vehicle running state accordingly. When the risk of rollover of the vehicle is detected, an early warning message is issued to the driver in time to remind the driver to correct the driving operation and avoid accidents. The invention carries out a portable design on the automobile early warning system, releases early warning information through an intelligent terminal, and can issue visual early warning information to drivers.

The invention relates to a shock absorber assembly load signal acquisition device which comprises a shock absorber assembly body, a first mounting hole, a second mounting hole and a third mounting hole are distributed in the shock absorber assembly body, and a first strain gauge mounting groove and a second strain gauge mounting groove are formed in the left side and the right side of the first mounting hole respectively. A third strain gauge mounting groove and a fourth strain gauge mounting groove are formed in the left side and the right side of the second mounting hole respectively, a fifth strain gauge mounting groove and a sixth strain gauge mounting groove are formed in the left side and the right side of the third mounting hole respectively, each strain gauge mounting groove is provided with a set of strain gauge sensors, the positions of each set of strain gauge sensors are divided into the outer side and the inner side, and each side is divided into the positive electrode and the negative electrode. Positive and negative electrodes of the six groups of strain gauge sensors are connected in series to form a signal collection unit with a signal positive electrode, a signal negative electrode, a power supply positive electrode and a power supply negative electrode; objective and accurate load signals can be obtained, the accuracy of virtual design is improved, the number of times of engineering change is reduced, the development time and cost are saved, and the vehicle development efficiency is improved.

The invention discloses a washing machine control method, a device, a machine-readable storage medium and a drum washing machine. The control method includes the steps of: S0: detecting the vibration of the drum washing machine (100) through an eccentricity detection bridge circuit (5), wherein the At least one bridge arm resistance in the eccentricity detection bridge circuit (5) is a resistive strain gauge sensor (4); S1: obtain the voltage signal of the bridge circuit output terminal (51) of the eccentricity detection bridge circuit (5) , the voltage signal characterizes the magnitude of the vibration of the drum washing machine (100); S2: Determine the detection result of the eccentricity of the laundry distribution in the drum washing machine (100) according to the fluctuation value of the voltage signal and a preset fluctuation threshold . The control method of the invention is novel, can realize stable, high-precision detection and control of the eccentricity of the washing machine, and has low cost.