59results about How to "Simple test principle" patented technology

The invention relates to a cable open-circuit point position detecting method, including the following steps: 1. selecting two uniform lead wires with equal distances and lengths from the cable, wherein the lead wire cd is an open-circuit lead wire; 2. connecting two test pens of a capacitance testing instrument or equipment with the end point a of the lead wire ab and the end point c of the lead wire cd to measure the distributed capacitance C1 between the lead wire ab and the lead wire cd; 3. connecting two test pens of the capacitance testing instrument or equipment with the end point b of the lead wire ab and the end point d of the lead wire cd to measure the distributed capacitance C2 between the lead wire ab and the lead wire cd; 4, calculating the relative distance X from the open-circuit point position to the end point c according to the formula. The method solves the technical problems that the existing cable fault point detecting method has high test requirement and complex test process, and has the advantages of convenience and easiness in operation.

The invention relates to a detecting method for a short dot position of a cable. The detecting method includes the following steps that (1) two even leads equal in length and interval are selected in the cable; (2) two testing meter pens of a resistance testing instrument or device are connected with an endpoint a and an endpoint c of the lead ab and the lead cd respectively to obtain resistance Rac; (3) the two testing meter pens of the resistance testing instrument or device are connected with the endpoint a and an endpoint b of the lead ab respectively to obtain resistance Rab; and (4) the two testing meter pens of the resistance testing instrument or device are connected with the endpoint c and an endpoint d of the lead cd to obtain resistance Rcd and the like. By means of the method, the technical problem that the existing cable fault point detecting method is high in testing requirements and complex in a testing process is solved. The detecting method has the advantages of being convenient, easy to operate and the like.

The invention relates to a device for testing reliability of a safety belt and a binding system of a baby carriage. The device comprises a directly-driven motor (DDR), an intelligent driver, a set ofhigh-speed silent screws, a set of linear bearing guide rods and a pair of quick-fixing fixtures (upper and lower fixtures), an S double-connection hole type force measurement sensor (a foil gauge type sensor), an amplifier and a data processing system are utilized to complete measurement, upper and lower limit positions of the device are respectively provided with a proximity switch, the equipment is guaranteed not to carry out over-travel operation, safety of equipment operation and testers is guaranteed, a man-machine dialogue mode is employed, so the force value and time and the repeated experiment frequency in the pulling process can be accurately guaranteed. The device is advantaged in that artificial interference is eliminated, data confirmation is directly utilized, and detection accuracy and efficiency are greatly improved.

The invention relates to a single tower cable-stayed bridge model test system based on damage identification for the field of bridge test science. The test system comprises a single tower cable-stayed bridge model, a lever loading system and a cable tension test system, wherein the single tower cable-stayed bridge model comprises a main bridge, a main tower, a stayed cable, a support, a base and a support upright which are assembled together; the lever loading system comprises a gantry device, a lever device and a lintel device, wherein the gantry is transversely arranged above the main beam of the single tower cable-stayed bridge model, and the lintel device is placed on the main beam of the single tower cable-stayed bridge model; and the cable tension test system comprises an anchoring screw, a leveling block, a pressure ring sensor and an adjusting nut which are mounted in a cable beam anchoring area. According to the invention, model tests for the dynamic and static performance ofthe cable-stayed bridge and experimental studies on the damage identification method of the cable-stayed bridge structure can be performed; and moreover, real-time and quick measurement of the cable tension can be realized without changing the cable rigidity, and thus the problem of difficult measurement of cable tension in the cable-stayed bridge model is solved.

The invention relates to a device and method for determining a molecular diffusion coefficient of a multi-component gas-liquid system in a rock core. The device mainly comprises an inlet pump, a confining pressure pump, a pressure returning pump, an intermediate container, a rock core clamper, an oil-gas two-phase separator, a pressure sensor and a computer, wherein one end of the intermediate container is connected with the inlet pump; thee other end of the intermediate container is connected with the rock core clamper; the rock core clamper is connected with the pressure return pump, the confining pressure pump and the oil-gas two-phase separator; and two ends of the rock core clamper are connected with the pressure sensor and the computer. The method comprises the following steps of: transferring an oil sample and a gas sample into the rock core through the inlet pump; contacting an oil phase with a gas phase to generate diffusion and cause the reduction of the gas phase pressure; monitoring the pressure change of a gas phase zone; after the gas and liquid reach the balance, enabling the drained fluid in the rock core to enter the oil-gas two-phase separator; and analyzing and testing the gas phase composition and the property change. The device and method disclosed by the invention are reliable in principle and simple and convenient in operation; and the molecular diffusion coefficient of each component of the multi-component gas-liquid system in real rock core in the gas phase and oil phase can be determined under different temperature and pressure conditions of an oil reservoir and reasonable base data is provided for quantitatively evaluating the influence on the improvement on the recovery ratio caused by a molecular diffusion effect.

The invention provides a gallium-based liquid alloy-based sphygmomanometer and a blood pressure calibration method, which relate to the technical field of medical equipment, and specifically use a gallium-based liquid alloy column as a pressure-sensitive liquid for blood pressure testing to measure the blood pressure of a human body; The capillary length cooperates with the pressure control chamber to control the pressure of the sphygmomanometer, realizes the precise control of the gallium-based liquid alloy column, improves the measurement accuracy and shortens the length of the glass capillary while preventing the gallium-based liquid alloy from being oxidized; the sphygmomanometer and the The proposal of the blood pressure calibration method can greatly reduce the society's dependence on harmful mercury metals, solve the problems of poor measurement accuracy of electronic thermometers, and is expected to be greatly popularized and applied.

The invention provides a gallium-based liquid alloy-based sphygmomanometer and a blood pressure calibration method, relating to the technical field of medical equipment, specifically using a gallium-based liquid alloy column as a pressure-sensitive liquid for blood pressure testing to measure blood pressure of a human body; proposed and constructed An inert gas double-chamber pressure control system realizes precise control of the pressure of the chamber, and improves the measurement accuracy while avoiding the oxidation of the gallium-based liquid alloy; The dependence on metal can solve the problems of poor measurement accuracy of electronic thermometers, and it is expected to be greatly popularized and applied.

The invention discloses a capacitance measuring method based on the principle of electrostatic self-excited vibration, which comprises a high-voltage DC power supply, positive and negative electrode plates arranged in parallel, conductive microbeams, insulating supports, sampling resistors, capacitance to be measured, and a signal collector. The conductive micro-beams are fixed on the insulating support and placed in the middle of the positive and negative electrode plates. The positive and negative electrode plates are respectively connected to the positive and negative electrodes of the high-voltage DC power supply. One side of the sampling resistor is connected to the negative electrode plate and the other side is grounded. The capacitor to be measured is connected to the Between the root of the conductive microbeam and the negative pole of the power supply. When high-voltage direct current is applied to the positive and negative electrode plates, the conductive microbeams excite self-excited vibrations in the middle of the electrode plates, and the signal collector measures the pulse voltage at both ends of the resistance. The pulse voltage amplitude is linearly related to the capacitance to be measured. The magnitude of the pulse voltage can be calculated to obtain the size of the capacitance to be measured. The capacitance testing method proposed by the invention has simple principle and high measurement precision, and is suitable for measuring tiny capacitance values ​​in the pF order.

The invention provides a test device which simulates a satellite in-orbit state and separates two independent stars A and B through unlocking and separating devices on the ground and a detecting method. According to the scheme, a simulated star A is suspended by a structure mainly, and is unloaded gravitationally so as to simulate a test environment during separation of the star A and the star B;an unlocking bolt is unlocked by gas separation equipment, and the simulated star A acquires an upward thrust through a separating spring; by a pulley block and a balance weight mode, the gravity of the simulated star A is balanced; and by T-Prob of a laser tracker, position postures (x, y, z, alpha, beta, gamma) of the simulated star A in a whole upward movement process are acquired in real time.The test principle is simple, and the test device is easy to operate; an in-orbit state can be simulated, and gravitational balanced unloading to a spacecraft is realized effectively; a separation route is not lower than 80 mm; a balance force in the route is stable, and deviation is not greater than 0.1%; and a separation route is finished, the gradient of a system is smaller than 1 degree, andthe stability of the system is good.