59results about How to "The error of the test result is small" patented technology

The invention relates to a method for predicting the remaining service life of a universal circuit breaker operating accessory based on statistical data driving. The prediction method comprises the steps that distribution test is carried out on the relative increment of the operating time of the operating accessory from both qualitative and quantitative aspects to verify whether the relative increment conforms to normal distribution; on the basis, the maximum likelihood estimation method is used to estimate parameters in a degradation model; based on the concept of first arrival time, a remaining service life predicting model is established; and an analytical formula of the probability density function of the remaining service life is derived to predict the remaining service life of the circuit breaker operating accessory. According to the invention, the method considers the influence of uncertainties in the operation process of a device on the service life and can acquire the remaining service life distribution required for health management; the method does not use single point estimation; the method is convenient for quantifying the uncertainty of the prediction result of the remaining service life; and the efficiency of the operation and maintenance of a universal circuit breaker can be effectively improved.

The invention relates to a single-degree-of-freedom occlusion robot applied to food and dental monitoring. The robot comprises a static platform, a power device and a transmission device; the power device and the transmission device are in transmission connection with each other and are both arranged at the upper end of the static platform, an upper jaw fixed platform and a lower jaw adjustable platform are further up and down oppositely arranged at the upper end of the static platform, an upper jaw mounting platform is rotatably connected with the transmission device, and the lower jaw adjustable platform is slidingly connected with the static platform; the lower jaw adjustable platform includes a sliding flat plate, the upper end of the sliding flat plate is provided with a lower jaw mounting platform, and the lower jaw mounting platform is connected with the sliding flat plate through a platform lifting assembly; the upper jaw fixed platform and the jaw mounting platform are also provided with monitoring systems. The robot can simulate the occlusion process of teeth, the deformation state of food in the occlusion process is observed, the force bearing condition of a tooth modelis monitored through the monitoring systems, and therefore for different kinds of food, the whole force bearing conditions of the teeth in the occlusion process can be detected and analyzed.

Provided are a device and method for determining the gross volume density of a bituminous mixture through wax sealing. The determination device comprises a water tank with the top opened, a water-immersion balance is fixed at the top of the water tank through a support, a mesh basket used for containing a test piece is arranged in the water tank, and the mesh basket is connected with a hook of the water-immersion balance; the support comprises four supporting legs and a flat plate arranged on the top of the supporting legs, and the center of the flat plate is provided with a circular hole allowing the hook of the water-immersion to pass. The determination method comprises the following steps that 1, the mass of a dry test piece in the air is weighed; 2, standard sand is injected into the surface of the test piece, a paraffine film is formed on the surface of the test piece, and wax sealing is completed; 3, the mass of the test piece subjected to wax sealing in the air is weighed; 4, the test piece subjected to wax sealing is immersed in water, and the mass of the test piece in water is weighed; 5, the mass of the standard sand filled into the surface of the test piece is weighed; 6, the gross volume relative density of the bituminous mixture test piece is calculated according to a formula. The device is simple, implementation is convenient, and a test result error is small.

The invention discloses a machine tool guide rail installation plane parallelism quick measurement device and method, and the device comprises a sensor installation support and two measurement system supports, wherein the two measurement system supports are used for supporting the sensor installation support through leveling ruler sliding rails. The two measurement system supports are fixed on a machine tool guide rail installation plane, and the central lines of the two measurement system supports are coincided with the central line of the sensor installation support. A sliding block is disposed between the sensor installation support and the leveling ruler sliding rails, is fixed with the sensor installation support and drives the sensor installation support to move along the leveling ruler sliding rails. The sensor installation support is provided with electric vortex sensors, and the probes of the electric vortex sensors respectively face a side surface and a bottom surface in the machine tool guide rail installation plane. The method comprises the steps: support installation, sensor signal collection, sliding block movement, measurement circulating, and data processing. The electric vortex sensors are used for collecting data at different positions, and the parallelism error of the machine tool guide rail installation plane is fit. The device is simple in structure, is simple and convenient to operate, is small in testing result error, and is high in precision.

The invention relates to an optical insertion and return loss tester. The tester comprises a dual-wavelength laser, wherein the dual-wavelength laser is connected with an optical coupler through an optical path; the optical coupler is connected with a flange through an optical path; the flange is connected with the optical coupler through an optical path; the optical coupler is connected with a second detector through an optical path; the dual-wavelength laser is connected with a MCU (micro-programmed control unit) through an LD (laser diode) drive circuit; the second detector is connected with the MCU through an amplification circuit and an analog-to-digital conversion circuit; and the amplification circuit and the analog-to-digital conversion circuit are also connected with a first detector. The optical insertion and return loss has the beneficial effects of fast running speed, strong working performance, small errors in test results, simple structure, low cost, intuitive display and small volume and good portability, integrates functions of a plurality of instruments and is convenient to operate.

The invention discloses a method for controlling valve timing of a diesel engine. The method comprises the steps of barring the engine in a preset direction with the position where a piston is on a top dead center of compression as the initial position and detecting the lifting ranges of an inlet valve and an exhaust valve in real time; acquiring a first corner, relative to the initial position, of a flywheel of the engine at the moment when the lifting range, during closing, of the inlet valve is equal to a first preset lifting range; acquiring a second corner, relative to the initial position, of the flywheel at the moment when the lifting range, during opening, of the exhaust valve is equal to a second preset lifting range; adjusting the valve clearance and/or the position of a cam of the engine according to the first corner and the second corner to enable the first corner and the second corner to conform with a first standard corner range and a second standard corner range respectively. According to the method for controlling valve timing of the diesel engine, the corners corresponding the preset lifting ranges of the valves serve as reference values of valve timing to detect whether valve timing meets requirements accurately, adjustment is carried out in a targeted mode, and then technological requirements of the valve timing are finally met.

The invention, which belongs to the technical field of detection in food, particularly relates to preparation of an electrolytic solution and the use thereof for electrochemically detecting the content of sanshool quickly. The method comprises: providing an electrolytic solution containing a polar solvent and a supporting electrolyte; extracting a sanshool mother solution of a sample, carrying outdilution by using the electrolytic solution to obtain a to-be-tested solution, and adding an alpha-SOH standard solution to obtain a mixed solution; preparing an equal-concentration equal-volume to-be-tested solution again and adding two-times-volume alpha-SOH standard solution to obtain a mixed solution; repeating the process by multiple times and then detecting differential pulse voltammetry curves of sanshool substances in the mixed solution respectively by using a three-electrode system; and calculating the content of sanshool by combining a formula. The electrolytic solution has conductivity and no background interference exists during detection. The electrolytic solution has advantages of fast detection, high sensitivity, simpleness, high measurement accuracy, short time required for sample analysis, low cost, and great convenience in on-line detection and the like in the specific detection process.

The invention discloses a low-moisture industrial material lossless detecting method of electromagnetic wave technique, which comprises the following parts: metal resonance cavity, hollow dielectric tube and computer, wherein the metal resonance cavity is thermostatic and driven by electromagnetic wave; the hollow dielectric tube is set in the metal resonance cavity. The method comprises the following steps: (1) putting the coal powder with different filling densities and water in the metal resonance cavity; measuring the ªñf and attenuation of electromagnetic signal and coal powder temperature; storing the list in the computer to finish the scaling and calibration course; (2) reading the ªñf, attenuation of electromagnetic signal and temperature from the computer when the coal powder flows through the hollow dielectric pipe; obtaining the disposed coal powder moisture in the dielectric pipe time through checking the graph. The invention confines the error result of 0.31-1.49 percent moisture content less than 0.16 percent, which is a non-touchable measurement.

The invention relates to a dedicated mold for testing the electrical property of lithium iron phosphate. The dedicated mold comprises an insulating sleeve, two conducting compressing blocks and conducting housings, wherein the conducting compressing blocks are inserted into two ends of the insulating sleeve; the conducting housings are mounted at the two ends of the insulating sleeve; the space between the conducting compressing blocks is filled with lithium iron phosphate powder; a through hole is formed in the insulating sleeve; external threads are formed in two external ends of the insulating sleeve; inner threads matched with the external threads are formed in the conducting housings; the inner walls of the conducting housings are propped against and compress the conducting compressing blocks. Before tests, one conducting compressing block and one conducting housing are mounted at one end of the insulating sleeve, the insulating sleeve is uniformly filled with the lithium iron phosphate powder, and then the other conducting compressing block and the other conducting housing are mounted, so that the button cell utilized in the conventional charging and discharging tests can be replaced, and the test cost can be reduced; the conducting compressing blocks can get in direct and sufficient contact with lithium iron phosphate, so that the test data consistency of the lithium iron phosphate charging and discharging tests can be improved, and errors in the test results can be reduced.

The invention relates to a method and a device for indirectly measuring the leaking amount of a fire extinguishing agent in a low-pressure carbon dioxide fire extinguishing system, wherein the method and the device are used for judging the heat preservation and insulation effects in an indirect way. The method is favorable for overcoming the disadvantages of difficulty in hanging and transporting, low measurement precision and the like in the traditional direct weighing method. A collection container which is used for collecting the leaked carbon dioxide fire extinguishing agent and has a sealing performance is connected with a safety valve outlet of the low-pressure carbon dioxide fire extinguishing system; and the masses of the collection container and connection accessories of the collection container before the test and after the test are respectively measured and the difference of the masses of the collection container and the connection accessories of the collection container intwo times of weighing is the leaking amount of the fire extinguishing agent in the low-pressure carbon dioxide fire extinguishing system. According to the method and the device provided by the invention, a device and procedures for measuring the leaking amount of the fire extinguishing agent in the low-pressure carbon dioxide fire extinguishing system are simplified, the error of test results is small and the measurement precision is improved. Meanwhile, the installation, detachment and transportation of all the members are convenient, the operation is simple and easy, and the precision of a weighing device is high.

The invention discloses a high school physics free fall experiment simulation device, and particularly relates to the technical field of physics teaching equipment. The high school physics free fall experiment simulation device comprises a fixed base, wherein a balance plate is arranged at the top of the fixed base; two symmetrically distributed supporting sliding rods are arranged on the two sides of the top of the fixed base; sliding sleeves are slidably connected to the outer sides of the supporting sliding rods; an adjusting cross frame is arranged between the two sliding sleeves; and twosymmetrical mounting plates are fixedly connected to the top of the balance plate. According to the high school physics free fall experiment simulation device, by adjusting the heights of the adjusting cross frame and a bearing plate, a first experimental cylinder and a second experimental cylinder are slidingly stretched, the falling height of experimental spheres is adjusted, pumping is carriedout by a vacuum pump to enable the inner parts of a first experimental assembly and a second experimental assembly to be vacuum, the two experimental spheres with different masses are simultaneously released from the same height, free fall experiment demonstration is carried out, the influence by external force is small, the experiment result is accurate, the experiment error is reduced, the contrast is clear, and the relationship between mass and acceleration is convenient to observe.

The invention discloses an offline detecting device of a cigarette dropping pill. The device comprises a camera, a telecentric lens, a sensor, a culture dish, a parallel backlight source, a light source controller, a tablet computer, a bracket and an objective table. The bracket is mounted on the objective table; the camera is mounted on the top inside the bracket; and the telecentric lens is installed at the bottom of the camera. The tablet computer is installed in the middle of the outer side of the bracket. The culture dish is arranged on the objective table inside the bracket; the telecentric lens is arranged at the top of the culture dish; the parallel backlight source is disposed on the bottom side of the objective table and is arranged at the bottom of the culture dish. The sensor is arranged at the bottom of the inner side of the bracket, wherein the position of the sensor corresponds to the side of the culture dish. The light source controller is disposed at the bottom of theobjective table and is connected to the parallel backlight source. The sensor as a trigger source is connected with the camera; and the camera with the telecentric lens is connected to the tablet computer and image data are collected through the data line. The device has advantages of simple structure, small detection result error, high efficiency and accurate data.

The invention relates to an optical fiber barrier finder which comprises a flange and an optical coupler, and also comprises a CPLD (Complex Programmable Logic Device), wherein the CPLD controls an LD (Laser Device) to transmit optical pulses with different pulse widths and receives a PD (Photoelectric Diode) detector signal; the CPLD is also connected with an MCU (Microprogram Control Unit); the optical coupler is used for coupling light emitted by the LD and light emitted by the flange; and the light emitted by the LD is transmitted out from the flange through the coupler, and the light entering from the flange enters a PD detector through the coupler. The invention has the advantages of high operation speed, strong working property, long test distance, little test result error, simple structure, low cost, small volume, portability and audio-visual display.

The invention discloses a device for detecting green body strength of a nuclear fuel element. The device comprises a base, a vertical sliding mechanism, a clamping mechanism and a force measuring mechanism, wherein the vertical sliding mechanism is fixedly arranged on the base along a vertical direction; the clamping mechanism is transversely arranged along a horizontal direction; the clamping mechanism is provided with a mounting part and a clamping part used for clamping a green body; the mounting part of the clamping mechanism is connected with the vertical sliding mechanism in a sliding manner, so that the clamping mechanism can slide up and down along the vertical direction, and the vertical sliding mechanism can control the vertical sliding height of the clamping mechanism; the force measuring mechanism comprises a force measuring sensor and an impact plate which is transversely arranged along the horizontal direction; the impact plate is arranged on the base and positioned just under the clamping part of the clamping mechanism; and the force measuring sensor is mounted on the impact force to be used for detecting the impact force of the green body. The invention further provides a method for detecting the core block strength by using the device. The method is capable of effectively detecting external impact force stressed by a fuel core block, and has the advantages of small measuring error, stable and accurate data and the like, and is capable of greatly improving the detection efficiency.

The invention provides a device and a method for testing the pure shear creep property of an energetic material, relates to the technical field of energetic material mechanical property tests, in particular to the device and the method for testing the pure shear creep property of the energetic material. The device comprises a testing clamp suite, the testing clamp suite comprises an upper clamp and a lower clamp, and the upper clamp and the lower clamp are connected in a matched mode; an area enclosed by the upper clamp and the lower clamp is a test piece clamping area; the upper clamp comprises an upper clamp body and an upper clamping part fixedly connected with the support frame, one end, far away from the support frame, of the upper clamping part is fixedly connected with the upper clamp body, and the upper clamp body is provided with an upper accommodating opening for fixing one end of a test piece; the device is relatively simple in configuration and structure, can test the shear strength and the creep property of various energetic materials such as solid propellants and explosives under pure shear loading, breaks through the limitation that the existing energetic material pure shear creep property test method is insufficient, and can meet the requirement of long-time stable and reliable test.

The invention discloses a method for determining the content of ethylenediamine tetraacetic acid disodium salt in posaconazole injection, which comprises the following steps: (1) sample pretreatment:mixing posaconazole injection to be detected with a copper sulfate solution, adding a sodium hydroxide solution and water, performing mixing, performing filtering, and collecting the filtrate as a test solution; (2) elution: injecting the test solution into a chromatographic column, and pumping an eluent for elution; (3) detection: recording the peak area of the ethylenediamine tetraacetic acid disodium salt of the test solution; and (4) result calculation: comparing the test sample with the ethylenediamine tetraacetic acid disodium reference substance standard curve to obtain a detection result. According to the method disclosed by the invention, the residual sulfobutyl ether betadex sodium on the chromatographic column can be basically and completely eluted by adopting a gradient elutionhigh-proportion water phase, the influence of the sulfobutyl ether betadex sodium on the measurement of the disodium ethylene diamine tetraacetate is effectively eliminated, the error of a detectionresult is less than 1.5%, and the application requirements of related fields can be met.

The invention discloses a perpendicularity calibration degree detection device for constructional engineering, and relates to the technical field of building detection equipment. The perpendicularity calibration degree detection device for constructional engineering comprises a horizontal plate, a debugging structure is arranged below the horizontal plate, a rotating mechanism, a lifting mechanism and a detection mechanism are arranged above the horizontal plate, a base plate is fixedly installed at the top of the horizontal plate, and a sliding rail is fixedly installed at the top of the base plate. According to the perpendicularity calibration degree detection device for constructional engineering, through cooperative use of a right-angle rod, a sliding block, a spring, a connecting rod, a detection plate, a pointer and graduated scales, perpendicularity detection is conducted on a wall surface, the device is simple in structure and convenient to operate, meanwhile, a detection result can be visually observed by a user, and compared with traditional use of a traction rope and a lead weight, the device is not influenced by the working experience of operators, has small detection result error, is easier to operate, and is convenient to popularize and use.