42results about How to "Enables indirect measurements" patented technology

The invention discloses a toll station vehicle dynamic weighing estimation method and device. The method comprises the steps that a laser emitter set and a photoelectric receiver set are arranged on the left side and the right side of a toll station road respectively; a vehicle to be measured blocks laser emitted by the first laser emitter at first and then blocks laser emitted by the second laser emitter, an MCU control system calculates the speed of the vehicle to be measured when the vehicle passes through an impact force measurement device, and a left pressure sensor set and a right pressure sensor set input signals of impact force of a left wheel and a right wheel into the MCU control system; the speed and impact force of the vehicle to be measured serve as input of BP artificial neural network model, mass of the vehicle to be measured serves as output, and the mass of the vehicle is estimated. According to the toll station vehicle dynamic weighing estimation method and device, the relation between the kinetic energy of the moving vehicle and the impact force generated when the vehicle collides with a force measurement device is comprehensively considered, a road speed bump is utilized, the vehicle is allowed to keep a certain speed when passing through the speed bump, and meanwhile the artificial neural network technology is utilized, so that indirect measurement of the vehicle mass is achieved, and toll station going-through efficiency is improved.

The present invention discloses a busbar voltage detecting system and a fault diagnosis method based on a wireless sensor network (WSN). A plurality of busbar voltage detecting points are arranged in turn on each busbar trunk line; each MCU control circuit box is internally provided with a busbar A phase power picking device, a busbar zero phase power picking device and an MCU integrated circuit; each busbar voltage detecting point sends data to the least busbar voltage detecting point on the corresponding busbar trunk line through a corresponding node wireless module, and the last busbar voltage detecting points send all the data to an upper computer for processing through a terminal node device; and the upper computer calculates a voltage difference and a resistance changing value between two adjacent busbar voltage detecting points, compares the resistance changing value with a preset resistance changing value, and determines if faults exist within a busbar region between the two adjacent busbar voltage detecting points. The number of busbar voltage detecting devices can be effectively reduced, diagnosis of busbar fault regions is realized combining the WSN technology.

The invention relates to a method for obtaining lightning current based on an artificial neural network, which belongs to the lightning monitoring technology in the field of electric engineering. The method includes: using electric field and magnetic field sensors at different distances from the observation point in a lightning optical and electromagnetic synchronous observation system to obtain data of the electric field and magnetic field The training sample set and the test sample set are composed, and then preprocessing measures such as wavelet noise reduction and smoothing are performed on the data in the training sample set, and the artificial neural network is trained through the training sample set to obtain the network parameters of the artificial neural network: connection weights, Finally, use the test sample set to test the trained artificial neural network. The present invention is based on the Elman artificial neural network, and uses the electromagnetic field generated by the measured lightning discharge to calculate the lightning current data, thereby obtaining characteristic parameters such as the amplitude of the lightning current, providing basic parameters for lightning protection, and making lightning protection targeted.

The invention discloses a device and a method for detecting blood pressure and oxyhemoglobin saturation simultaneously, and belongs to the technical field of radial artery detection. By the device and the method, the problems that the blood pressure and the oxyhemoglobin saturation are needed to be detected by using separate sensors at present, so more electronic components of a detection device are needed, and the detection device is complex in structure are solved. The device comprises a cuff, a pulse generator, a photoelectric plethysm sensor, a wave crest retainer, a first high-pass filter, a first low-pass filter, a second high-pass filter, a second low-pass filter, an analog to digital (A/D) converter, a digital to analog (D/A) converter, a computer, an electro-pneumatic converter, an air pump, a power amplifier, and a pressure sensor; and according to the method, the radial artery is used as a detected target, the blood pressure, and the oxyhemoglobin saturation of arterial and venous blood can be detected simultaneously, and the oxyhemoglobin saturation of the venous blood is measured indirectly. The device and the method are suitable for detecting the blood pressure and the oxyhemoglobin saturation simultaneously.

A test method for steam internal leakage quantity of a low-pressure bypass valve of a thermal generator set comprises the following steps of (1) selecting a set load for performing internal leakage test on a bypass voltage of a low-pressure cylinder; (2) determining a boundary condition of experiment; (3) obtaining steam parameter change conditions of a low-pressure bypass system before and afterdesuperheating water flow change by changing bypass desuperheating water flow of the low-pressure cylinder; (4) recording an experiment parameter of each working condition point, and forming originalexperiment data; and obtaining internal leakage steam flow of the low-pressure bypass valve by calculation. An energy balance, mass balance and same boundary loss item offset method is employed, the internal leakage steam flow of the low-pressure bypass valve of the thermal generator set is obtained by accurate and quantitative calculation of experiment, quantitative analysis and calculation is performed for the low-pressure bypass valve of the thermal generator set when internal leakage occurs, and the most direct data support is provided for power plant running economy and maintenance operation of the low-pressure bypass valve of a power plant.

The invention relates to an inspection device used in the sliding rail production process, in particular to a sliding rail outer rail measuring device. The sliding rail outer rail measuring device comprises a base, wherein an end blocking plate and a measuring scale are respectively fixed at two ends of the base surface, a sliding rail is fixedly arranged on the upper surface of the base, two ends of the sliding rail are respectively connected with the positions of the end blocking plate and a base plate of the measuring scale, a measuring table and a slide block are arranged on the sliding rail in a sliding mode, a second measuring rolling wheel and a third measuring rolling wheel are fixedly arranged on one side of the upper surface of the measuring table close to the slide block, and a connection line formed by the second measuring rolling wheel and the third measuring rolling wheel is parallel to the long side of the measuring table. A first measuring rolling wheel and a measuring blocking plate are fixed on the top face of the slide block, the end of a measuring rod of the measuring scale abuts against the measuring blocking plate, and a spring is arranged between the measuring table and the slide block. The sliding rail outer rail measuring device can conveniently and quickly measure whether a sliding rail outer rail meets fixed specification parameters or not.

The invention provides a simple tool for detecting the strength of coal briquettes. The simple tool comprises a support and a full-sealed water tank, a threaded sleeve is vertically installed on the support, a lead screw installed in the threaded sleeve in a threaded fit mode penetrates through the threaded sleeve, and the full-sealed water tank comprises a tank body with an opening in the upper portion and a leather cover buckled on the opening in the upper portion of the tank body; the tank body is communicated with a water pipe, a pressure gauge is installed at the end, exposed out of the tank body, of the water pipe, a horizontal base plate is arranged on the leather cover, the full-sealed water tank and the water pipe are filled with water, and coal briquettes are placed on the horizontal base plate during work. According to the invention, the coal briquettes are pressed on the full-sealed water tank, the pressure borne by the coal briquettes is converted into the water pressure in the full-sealed water tank in real time, and then the pressure gauge is used for monitoring the change of the water pressure in the full-sealed water tank, so that the indirect measurement of the compressive strength of the coal briquettes is realized, and the maximum value of the pressure gauge (the value monitored by the pressure gauge when the coal briquettes are about to break) can be used for representing the compressive strength of the coal briquettes.

The invention provides an ankle joint recovery stressed-force measuring device. The ankle joint recovery stressed-force measuring device comprises a bracket; a measuring plate is fixedly mounted at the bottom of the bracket; a first force sensor, a second force sensor, a third force sensor and a fourth force sensor are arranged on the measuring plate; the force sensor is a resistance strain sensor; two resistance strain sensors are symmetrically mounted under heel node landing positions, and two resistance strain sensors are mounted at the landing positions of the first head of phalanx and the fifth head of phalanx, respectively; the device further comprises a measuring device controller which is glued to the shank portion of the bracket by use of an adhesive tape; the first force sensor, the second force sensor, the third force sensor and the fourth force sensor are connected to an amplifier for inputting into a single chip MSP430F4270IDL, respectively; the single chip is connected with an LCD, a key and an audible and visual alarm, respectively; the measuring device communicates with an upper computer by use of a wireless module PTR2000. The ankle joint recovery stressed-force measuring device realizes indirect measurement of ankle joint recovery stressed force and torque and is convenient for patients to control the recovery strength under the guidance of a doctor.

The invention relates to a proportional valve, in particular to an intelligent calibration device and method for a steady-state fluid force of a valve element of a proportional valve. The proportionalvalve with a valve controller is mounted in a mounting table of a pressure adjustable hydraulic system valve; a circuit board for calibration is connected to the valve controller, and a D/A module onthe circuit board sends out a position command to the valve controller, so that the circuit board is controlled in a target position, and the A/D module receives a valve element position fed back bythe valve controller and a current signal of the proportional valve; the circuit board is programmed by using a singlechip microcomputer or other microprocessors, a signal collected by a program is processed to obtain a fluid force of a measuring point and a position command signal of a next measuring point is sent out till the fluid forces of all measuring points are measured, and at the moment,the circuit board for calibration sends measured data to a computer by way of serial communication or bus communication. According to the intelligent calibration device and method, the amplitude of the fluid force can be calibrated automatically without detaching a proportional valve body.

The invention relates to a system and a method for measuring pulverized coal concentration and speed deviation of a boiler pulverized coal pipeline. The system comprises a mixing unit and a measuring unit. The mixing unit comprises a luminous powder falling pipe used for being connected with the coal falling pipe, the luminous powder falling pipe is connected with a luminous powder bin, the luminous powder bin is provided with an adjusting door used for adjusting the powder falling amount, and a lighting device used for light absorption of luminous powder is arranged in the luminous powder bin. The measuring unit comprises a section of transparent pipeline arranged on the primary powder pipe, high-speed cameras are arranged on the periphery of the outer side of the transparent pipeline, and the high-speed cameras are connected with the control module and the image processing unit. The flow and flow velocity of the pulverized coal airflow can be accurately measured by using one set of equipment under the condition that the pulverized coal airflow is not contacted, and the reliability is relatively high. And after the flow, namely the flow velocity, of the pulverized coal airflow is measured, an operator can adjust the flow and the flow velocity of each branch pulverized coal pipe according to a measurement result, so that safe and stable operation of the boiler is ensured.

The invention discloses a primary side coil current measurement circuit of a magnetic-induced radio energy transmission system. The magnetic-induced radio energy transmission system comprises a groundcontrol circuit and a primary side coil arranged on the ground; the primary side coil current measurement circuit comprises an output voltage sampling circuit for processing output voltage of a ground control circuit and outputting the processed output voltage of the ground control circuit; and an output current sampling circuit for processing the output current of an inverter and outputting thevoltage corresponding to the processed output current of the inverter. The primary side coil current measurement circuit can realize indirect measurement on the primary side coil current, and then a system running state is judged by monitoring the primary side coil current in real time, and the reliability of the system running is guaranteed; and the primary side coil current measurement circuit is simple in structure, low in cost and capable of realizing remote measurement.

The invention discloses a non-contact electromagnetic detection method for discrete phase non-conductive particles, which belongs to the field of electromagnetic measurement. The method specifically comprises the steps of firstly, applying alternating magnetic field excitation by using a multi-turn micro coil, and acquiring an induced voltage signal; utilizing a phase-locked loop principle to carry out frequency-mixing low-pass filtering processing on the induced voltage signal and a reference signal, demodulating a phase, judging whether the phase corresponding to the induced voltage signal is equal to the phase when no non-conductive particles pass through, if so, determining that a discrete phase is normal, and repeatedly executing the induced voltage signal at the next moment; otherwise, determining that the non-conductive particles pass through the discrete phase; obtaining the phase corresponding to each moment through uninterrupted measurement, and finally, comparing each phase value one by one according to a selected threshold tau, so that the count of the discrete phase non-conductive particles is obtained by counting the number of times of phase abnormality. According to the invention, efficient real-time detection of the flowing discrete phase non-conductive particles is realized.