37results about How to "Increase test frequency" patented technology

The invention is a pollutant aerobic-biodegradation breathing measuring method and device, relating to a method and device for measuring oxygen utilization ratio in the course of processing waste water by aerobes. And the measuring method comprises the steps of: checking dissolved oxygen sensor, keeping temperature of water tank constant, putting in microbial mixed solution, blending, circulating mixed solution, setting parameters, putting in to-be-measured sample and calculating; and the measuring device comprises water tank, magnetic blending mechanism, aeration mechanism, aeration chamber, breathing chamber, measuring chamber, pH sensor, dissolved oxygen sensor, signal transmit lines, transducer terminal box, computer and oxygen utilization ratio measuring software. And the invention has advantages of less interference, high testing accuracy and frequency, high instrument automation degree, etc. and it is applied to the aspects of city sewage composition characterization, inlet water toxicity detection, evaluation and early- warning in sewage factory, process control and operation management in sewage factory, etc.

The invention provides a method for testing the high-cycle fatigue performance of an engine fan blade, and relates to the technical field of structural mechanical performance tests. The technical point is that the inherent frequency of the engine fan blade is obtained by a sweep frequency test, and whether the vibration shape of the blade meets the test requirements is judged a phase relationshipbetween vibration data collected by sensors at different positions of the blade; and by adoption of the method provided by the invention, the vibration shape of the fan blade can be accurately judgedbased on a limited number of sensors, the test state of the fan blade can be accurately determined, the test frequency is improved, the test time is shortened, a plurality of check positions are provided for selection, the fatigue performance of the engine fan blade can be comprehensively evaluated, and the reliability in an external field service process is improved.

The invention relates to a method for preparing high-dielectric constant barium titanate ceramic. The preparation method comprises the following steps of: mixing solution A and solution B; reacting to obtain a sol state substance at the temperature of between 40 and 80 DEG C; precipitating the sol state substance for 4 to 6 hours in the air; drying the sol state substance in an oven at the temperature of between 100 and 160 DEG C for 10 to 24 hours to obtain xerogel; sintering the xerogel twice in a muffle furnace at the temperature of between 700 and 1,100 DEG C, and grinding the xerogel for 1 to 3 hours during the sintering; taking powder out, grinding the powder in the air for 0.5 to 1 hour; compressing the powder into wafers with the diameter of between 10 and 20mm under the pressure of 1GPA with a powder compressing machine; and sintering the wafers in the muffle furnace at the temperature of between 1,250 and 1,340 DEG C to obtain secondary-sintered barium titanate ceramic. The maximum dielectric constant of the barium titanate ceramic prepared by the preparation method can reach 24,173 when the frequency at room temperature is 100Hz. Compared with the conventional method for preparing barium titanate, a sol-gel method can reduce the temperature, and a secondary sintering method can greatly improve the dielectric constant of the barium titanate.

The invention discloses a wideband rotating magnetic characteristic measuring system and method based on a flexible excitation coil. The measuring system comprises a detection device, a digital signal processing unit, a power amplifier, and a differential amplification circuit. The digital signal processing unit is connected with the power amplifier and the differential amplification circuit. The detection device is connected with the power amplifier and the differential amplification circuit. The detection device comprises a three-stage frustum-shaped excitation winding, a sample holder, a horizontal structure magnetic ring, a center pillar, a buckle, a corner pillar and a base. The excitation winding of the measuring system is designed as a multi-stage frustum-shaped structure to realize a wideband magnetic characteristic test. The measuring method comprises first giving an excitation signal with a low frequency, gradually increasing the frequency of the excitation signal until the sample is saturated; replacing the excitation winding connection mode after the sample is completely measured in the excitation winding connection method, and repeating the measurement process until the highest detection band.

The invention provides a dielectric constant extracting method based on a coplanar waveguide transmission line and terminal equipment. The method comprises the following steps: designing a plurality of redundant transmission lines as a standard to cover a to-be-detected sample dielectric constant frequency range, analyzing errors in a TRL calibration process, and establishing an error analyzing model of a solving transmission constant; selecting common lines according to an effective phase transfer rule, forming line pairs by using the obtained common transmission lines and other transmissionlines to repeatedly and independently measure the various line pairs, and acquiring observation values of a plurality of transmission constants according to the error analyzing model; and determiningunit length resistance and unit length inductance of the transmission lines according to the observation values of the various transmission constants to finally obtain substrate dielectric constants of the transmission lines. By the method and the terminal equipment, the testing frequency of the dielectric constant can be greatly improved, test of wide-broadband dielectric constant is supported, the testing efficiency is improved, and the test is simplified.

The invention belongs to the technical field of ground and foundation engineering and oceanographic engineering, and relates to a rock-inserted steel pipe pile load test device and method under the cyclic loading effect. Oriented pulleys are installed and fixed to the ends of a cuboid model box. A steel pipe model pile and a steel block weight are connected together through a thin long steel wireby means of the oriented pulleys at the ends. After a steel pipe model pile is inserted in rock by a certain depth, the horizontal cyclic load is simulated by applying the steel block weight, the horizontal displacement of the ends of the steel pipe model pile is recorded by a laser displacement sensor after the steel block weight is applied, and therefore the horizontal bearing property of the steel pipe model pile under the effect of different rock insertion depth and different loads and frequencies is obtained, and the theoretical basis is provided for the design of the large-diameter super-long steel pipe pile under actual working conditions. The rock-inserted steel pipe pile load test device and method are simple in structure, convenient to operate, accurate in test data, low in costand friendly to the environment.

The invention discloses capacitance test circuit and test method under a DC bias condition. The circuit comprises a DC voltage stabilizing power source, an inductor, a diverter switch, a first capacitor, a second capacitor, an impedance tester and a bidirectional diverter switch. The DC voltage stabilizing power source and the inductor are connected in series and then are connected with a capacitor to be tested through the diverter switch; the first capacitor and the second capacitor are connected with the two ends of the capacitor to be tested, and the impedance tester is connected between the first capacitor and the second capacitor through the bidirectional diverter switch. The method comprises: switching on the diverter switch, connecting the bidirectional diverter switch to one end of the second capacitor, and charging the capacitor to a stable value; and then connecting the bidirectional diverter switch to the impedance tester, switching to an impedance test state, adjusting the impedance tester to obtain impedance, and then calculating to obtain the impedance of the capacitor to be tested. According to the invention, a charging process and an impedance test process can be switched, the impedance characteristics with in a wide DC bias scope and a wide frequency scope can be measured, and the impact caused by charging and discharging currents of the capacitor to the impedance tester is eliminated.

The invention discloses test equipment and a test method to leak of RF cable assemblies. Microwave test signals are sent to measured cable assemblies from the RF signal source, and signals are absorbed by matched load through cable assemblies. Microwave pathway is constituted of RF signal generator, cable assemblies, matched load. There is microwave signal leakage existing around the object when the signal goes through the objects. These signals are collected by signals collection device and sent into microwave receiver. We can get the decibel value of the corresponding pieces of RF leakage through the readings letters of RF signal source and microwave receiver.

The invention discloses an online titration method for measuring proton variation rate (HVR) in biological wastewater treatment. The HVR in the biological treatment is obtained by measuring pH values of an inlet and an outlet of a reaction chamber by two pH electrodes and controlling titration based on pH1 and pH2. The method helps realizes continuous high-precision measurement of the HVR in the wastewater treatment and also realizes field online measurement of the HVR in an actual wastewater treatment system without sampling. The invention also discloses an online titration device for measuring the HVR in biological wastewater treatment, which is used for realizing the method.

The invention discloses a bed fatigue test controller for a light, mechanical and electronic integration medical instrument, belonging to the technical field of light, mechanical and electronic integration. The bed fatigue test controller comprises a base, wherein support pillars are respectively arranged on the left side and the right side of the bottom part of the base; support frames are respectively arranged on the left side and the right side of the top part of the base. Compared with an existing bed fatigue test controller for the light, mechanical and electronic integration medical instrument, the bed fatigue test controller for the light, mechanical and electronic integration medical instrument, provided by the invention, adopts ultrasonic fatigue testing; compared with other fatigue testing machines, the test frequency of an ultrasonic fatigue testing machine is larger, so that a test result is more accurate; in addition, on the basis of the existing bed fatigue test controller for the mechanical and electronic integration medical instrument, an image acquisition sub-system and an image analysis sub-system are added, so that a direction and speed of crack propagation of a sample can be analyzed and calculated through real-time monitoring the sample when the sample is subjected to fatigue test, the force analysis is cooperatively carried out on the sample, and thus analyzed data is more accurate.

The invention discloses a DC bias feature test circuit and test circuit of a capacitor. The circuit comprises a DC voltage-stabilizing power supply, a test instrument, a first capacitor, a second capacitor, a first switch and a second switch, wherein the first capacitor and the second capacitor are connected in parallel, one end of the DC voltage-stabilizing power supply is connected with one end of the first capacitor and one end of the second capacitor, the other end of the DC voltage-stabilizing power supply is connected with the other end of the first capacitor through the first switch, the other end of the first capacitor is connected with the other end of the second capacitor through the second switch, the test instrument is connected with the two ends of the second switch, and the first capacitor is a capacitor to be tested; and the second capacitor is a capacitor to be tested which has the same structure and performance as the first capacitor or a voltage source with known impedance or a capacitor with known parameters. According to the invention, the problem of testing a capacitor load under DC bias is overcome, measured capacitance data of the DC bias in a high-frequency circuit is particularly accurate and effect, and the measured data does not need complex operation.

The invention provides a method for increasing testing signal frequency and testing signal generation equipment. The method for increasing the testing signal frequency comprises the following steps: 1, generating a first primary testing signal by using a first output channel of a testing machine; 2, generating a second primary testing signal by using a second output channel of the testing machine, wherein the duration of the high level of the first primary testing signal is within that of the low level of the second primary testing signal, and the duration of the high-level of the second primary testing signal is within that of the low level of the first primary testing signal; and a combination step of the primary testing signals, comprising combining the first primary testing signal and the second primary testing signal to generate a final testing signal, wherein when one of the first primary testing signal and the second primary testing signal is at the high level, and the final testing signal is at the high level during the corresponding duration.

The method comprises: making match for the first bit instruction of the asynchronous signals of the chips under test; by control the clock signals of previously matched chip, making the multi asynchronous tested chips keep synchronous; continuously comparing the responded multi-bit instruction to realize the match for multi-bit asynchronous signals when realizing the match for the multi asynchronous tested chips.

The present invention discloses a test platform for high-frequency cable, comprising conductive contacts and clamps for pressing a conductor of the cable on the conductive contact, and comprising a splitter seat, which comprises a top surface and a plurality of varied sides, the conductive contacts are respectively arranged on the sides, the clamps are arranged at a peripheral of the splitter seat and is opposite to the conductive contact, the splitter seat is further provided with a splitter channel, and the splitter channel slantingly connects the top surface to the sides. The present invention adopts a splitter seat with a polyhedral structure, which may shorten the stripped length, and prevent for vertically bending the core, thereby reducing the damage to the cable structure to the greatest extent, and greatly increasing the test frequency.

An indium tin oxide film hand-held probe testing device and its method, which can increase the measurement tempo by more than 3 times, reduce wear, bending and deformation, and reduce repair and maintenance costs; the device and its method are simple and reasonable, convenient and quick to use, and ensure reading Numerical measurement accuracy and measurement repeatability greatly improve work efficiency and yield; effectively prolong service life, reaching more than 2000 hours, energy saving and environmental protection. An indium tin oxide film hand-held probe testing device is composed of: a resistance tester device, a hand-held probe testing device shell, a self-weight counterweight, an upper sliding rod, an inner baffle plate of the shell, a test inner core device, and a base support anti-slip device, Smooth probe needle, sliding rod device, wire, test probe sleeve, S-shaped cantilever spring; base support anti-skid device is set above the indium tin oxide film, and a hand-held probe test device shell is set above the base support anti-slip device; to meet the needs of users and market demand.

The invention belongs to the technical field of bridge construction and relates to an automatic online monitoring method and system for cable clamp slippage and a readable storage medium. Displacementdata, collected by a displacement meter, of a cable clamp relative to a main cable are sampled according to a preset sampling frequency; temperature data collected by a temperature meter are sampled;an average temperature vector T of the same section temperature of the main cable is obtained according to the temperature data; a displacement monitoring vector X of the cable clamp relative to themain cable is obtained according to the displacement data; a corrected cable clamp slippage value is obtained according to a linear correlation equation of the average temperature vector and the displacement monitoring vector. According to the automatic online monitoring device for the cable clamp slippage, cable clamp slippage displacement data and structure temperature near the cable clamp are sampled through the displacement meter and the temperature meter; a temperature meter measurement result and a displacement meter measurement result can be combined; temperature influences are eliminated through algorithm correction, and therefore, the accurate cable clamp slippage value is obtained.