513 results about "Environmental tests" patented technology

An autonomous driving test platform based on virtual-real integration technology, which platform belongs to the technical field of autonomous car testing. On the basis of cloud-edge-end three-level linkage, the platform combines real environment testing and sand table environment testing with virtual simulation technology. A vehicle-end real scene is an actual environment in which an autonomous vehicle is applied; and environmental information is collected, and feedback is provided for the environmental information and virtual-real fusion information. In a cloud-end virtual environment, in addition to building an autonomous driving virtual scene, data fusion is also performed on information from a real scene and a sand table scene, so as to generate virtual-real fusion data. A sand table environment is used as an edge portion to provide a relay space, which is used for bridging the cloud-end virtual environment to a vehicle-end real environment, digitally twinning the autonomous vehicle in the actual environment to a virtual simulation environment, and transmitting the virtual-real fusion information to the autonomous vehicle. The sand table environment, the virtual environment and the real environment fully interact with one another to implement data enhancement, thereby obtaining an optimal test effect.

The invention belongs to the technical field of material and coating corrosion tests, and relates to a whole sea area atmospheric environment comprehensive simulation test system, which adopts an integrated structural design, and performs integrated coupling of various environmental test simulation capabilities on the basis of a single-function test box. The device has the test capabilities of metal material corrosion acceleration test, organic composite material and coating aging evaluation and the like, can simulate the global marine atmospheric environment and coupling of multiple factors such as air temperature, humidity, salt mist and ultraviolet irradiation, can perform comprehensive test evaluation on the whole-sea-area marine atmospheric environment of typical materials, avoids the problem of inconvenient operation of corrosion tests, and has a wide application prospect. The device can be used for corrosion and ultraviolet aging tests of conventional marine atmospheric environment corrosion media, polar regions, tropical regions and other extreme marine atmospheric environments, and material corrosion tests for simulating marine splash zones, tidal range zones and the like. The device is simple in structure and convenient to operate, and coupling of multiple factors of high and low temperature, humidity, salt mist, ultraviolet illumination and periodic infiltration can be achieved.

The invention discloses an integrated buoy for ocean monitoring and a buoy testing method.The buoy comprises a floating body, a solar panel support, a sensor support and a data acquisition communication box are fixedly installed on the top of the floating body, and a plurality of solar panels with the bottoms inclined outwards are installed on the solar panel support; a plurality of sensors are installed on the sensor support, and communication equipment and a data collector are installed in the data collection communication box. According to the invention, the laboratory integration test, the coastal water surface test and the offshore laying test are combined, three times of data comparison and verification are carried out, the consistency and precision of the data can be effectively ensured, and in addition, the environmental simulation equipment is added during the offshore laying test to simulate different environments in the marine environment, so that the test efficiency is improved. The floating property and the stability of the buoy under different extreme conditions are tested, remote monitoring and self-diagnosis technologies are introduced into the buoy in a matched mode, personnel can conveniently and visually know the condition of the buoy in the testing process, and the use requirement is met.

The ATP Heavy allows for specific battery types to be easily inserted on shelving that can be configured depending on the battery type and testing needs. In one embodiment these shelves are then manually or pneumatically controlled to safely engage the battery to a connecting plate for connectivity and full power testing. This allows an operator / test technician to safely change the batteries and begin testing without any requirement to disconnect and reconnect external devices and test equipment. Time savings and testing density are optimized in the platform.

The invention discloses a leakage current test analysis method and platform for a low-power-consumption chip, and belongs to the field of semiconductor testing, and the method comprises the steps: collecting the chip feature data of a target low-power-consumption chip, and determining a plurality of environment parameter test ranges and working voltage test ranges of the target low-power-consumption chip; generating an environment test sequence and a voltage test sequence, combining the environment test sequence and the voltage test sequence, and generating an adaptive test scheme; constructing a leakage current data matrix based on the adaptive test scheme; obtaining a first analysis result; obtaining a second analysis result; and obtaining a leakage current characteristic evaluation result of the target low-power-consumption chip based on the first analysis result and the second analysis result. The technical problems that in the prior art, the leakage current testing condition is single, the characteristics of the low-power-consumption chip under the multi-environment parameter and voltage condition are difficult to comprehensively evaluate, and consequently the accuracy and applicability of the testing result are insufficient are solved.

The invention discloses a variable environment fuel oil atomization quality test system and test method. The system comprises a high pressure common rail injection system, a low temperature refrigeration system, an electronic control system, an image data acquisition system and an environment test chamber. The low-temperature refrigerating system reduces the temperature of fuel oil in the oil injector through convective heat exchange; the environment test cabin simulates the environment air pressure, temperature and humidity in the cabin according to the actual environment parameters in the cylinder in the engine operation process; the image data acquisition system acquires spray image information of low-temperature fuel oil in a variable environment and performs image processing, and by actually measuring the circulating oil injection quantity during fuel oil injection, the Sott average diameter is calculated according to different empirical formulas, and the fuel oil atomization characteristics are comprehensively analyzed. The invention provides a reliable experimental means for researching the fuel oil atomization condition of the fuel oil in a low-temperature state in a low-temperature environment in the cold start process of the engine, deeply analyzing the influence of a complex environment on the cold start of the engine, and seeking to improve the cold start performance of the engine.

The invention relates to the field of vehicle environment testing, in particular to a semi-wind tunnel system for vehicle testing environment simulation and a control method of the semi-wind tunnel system. The air supply unit, the air return unit, the circulation unit, the power unit, the power generation recovery unit and the control unit are installed on the system body. Wherein the air supply unit and the vehicle test position are correspondingly arranged on the front side of the system main body, the air return unit and the vehicle test position are correspondingly arranged on the rear side of the system main body, and the circulation unit and the vehicle test position are correspondingly arranged on the upper side of the system main body. The power generation recovery unit and a vehicle test position are correspondingly arranged on the lower side of the system main body. According to the semi-wind tunnel system for automobile test environment simulation, the defects of the environment simulation cabin and the heat energy wind tunnel are avoided, the advantages of the environment simulation cabin and the heat energy wind tunnel are integrated, and the semi-wind tunnel system for automobile test environment simulation is uniform in temperature and humidity, stable in airflow, low in manufacturing cost and low in energy consumption.

To provide an environmental test apparatus capable of performing a long-term deterioration test in which a test sample is exposed for a long period to methane-dissolved water under a low-temperature, high-pressure environment simulating a seafloor environment.SOLUTION: An environmental test apparatus 100 according to an embodiment is an environmental test apparatus for performing a long-term deterioration test in which a test sample is exposed to methane-dissolved water under an environment simulating a seafloor environment where methane hydrate is present and includes: a pressure-resistant vessel 110 which houses the test sample and in which the methane-dissolved water at a temperature and pressure corresponding to the seafloor environment flows through the test sample; a cooling unit 120 that cools and maintains the pressure-resistant vessel 110 at the temperature; and a pressurizing circulation unit 130 that pressurizes the methane-dissolved water flowing out from an outlet 110b of the pressure-resistant vessel 110 and sends it toward an inlet 110a of the pressure-resistant vessel 110.SELECTED DRAWING: Figure 1

The invention provides a vehicle body coating filamentous corrosion testing method which comprises the following steps: destroying a coating on the surface of a test piece, exposing a metal matrix, and cleaning chips on the surface of the test piece; introducing an electrolyte solution on the metal matrix at the damaged part of the coating; placing a cover plate at the damaged part of the coating; transferring the test piece with the cover plate into an environmental test box, and setting temperature, humidity and test time; the test piece is moved out of the environment test box, washed, dried and photographed, the filiform corrosion length is measured, and the filiform corrosion risk of the plated steel is judged according to the filiform corrosion length. The method provided by the embodiment of the invention can shorten the test time.

The invention belongs to the technical field of missile system testing and data processing, and particularly relates to a steering engine testing method and device, and the method comprises the steps: respectively testing a controller, a driver, an actuator, a cable and all parts of accessories which form a steering engine system; all the component units are assembled; carrying out matching test on each composition unit; the steering engine is assembled, and system electrical communication is completed; performing function test and performance test on the steering engine in a normal temperature state; performing performance test on the steering engine under various environment test conditions; testing the limits of the steering engine under various boundary conditions; carrying out local abnormal value detection and elimination on all test data; and analyzing the test data to obtain a steering engine test result, and generating a test report. By improving the testing method, coverage of ground testing content of the steering engine is guaranteed, and the reliability of the steering engine is improved; by designing a data processing and data analysis method, steering engine test data are processed, and the test efficiency is improved.

The invention discloses a low-speed compact wind tunnel experimental device suitable for building outdoor wind environment testing, which comprises a matrix fan system and a modularized segmented structure (sequentially comprising an air inlet section, a rectification section, a model placement area and an air outlet section), and all the sections are connected through flange plates and sealing parts to guarantee the sealing performance. Wherein the matrix fan system is composed of 4 * 4 fans, each fan is subjected to independent frequency modulation through a frequency converter, and the airflow speed is actively adjusted; each section in the modularized segmented structure is an independent module; the air inlet section is used for mixing jet flow generated by the matrix type fan system; a plurality of rectifying parts are arranged in the rectifying section, and the uniformity, turbulence intensity and wind speed gradient of airflow are passively adjusted by configuring different parts, so that specific wind field environment characteristics required by an experiment are accurately simulated; the model placing area is provided with a rotatable disc used for placing a building reduced scale model required by an experiment. The air outlet section is located at the tail end of the wind tunnel experiment device and is provided with an airflow outlet with an adjustable cross section area.

The invention discloses salt spray environment test equipment for environment test, and belongs to the technical field of environment test. The device comprises a test box, a spraying assembly is installed in the test box, a plurality of fans are fixedly installed in the test box, a plurality of heaters are fixedly connected in the test box, a test rack is placed in the test box, a clamping assembly is installed on the test rack, and a simulation assembly is further installed on the test rack. The simulation assembly comprises a shielding assembly, an impact assembly and a friction assembly, the shielding assembly comprises a supporting frame, and a hydraulic cylinder is fixedly installed on the supporting frame. In the circulating corrosion test process, the hydraulic cylinder can be started, atomized saline water is prevented from falling on a sample, and the shielding time can be manually set, so that a control test is formed, that is, one part of the sample is shielded, the other part of the sample is not shielded, and different shielding time can be set on different samples, so that the accuracy of the control test is improved. And test results are enriched.

The invention relates to the technical field of programmable multi-mode integrated control, in particular to an integrated control platform of a programmable multi-mode environmental test chamber, which comprises a multi-mode sensing unit, a dynamic logic reconstruction unit, a virtual verification sandbox unit and a feedback optimization unit, the multi-modal sensing unit synchronously collects parameters such as temperature and humidity to generate environment data streams, the dynamic logic reconstruction unit analyzes parameter interaction by using a long-short-term memory neural network in combination with a double-attention mechanism to generate an optimal control logic chain, the virtual verification sandbox unit constructs digital twin pre-execution control logic, and the virtual verification sandbox unit constructs digital twin pre-execution control logic. The physical actuator is activated after the error rate is ensured to be lower than a preset threshold value, the feedback optimization unit dynamically adjusts the function block selection weight according to the actual response time delay and the energy consumption deviation, and a high-precision and low-energy-consumption intelligent control scheme is provided for the reliability test of high-end products in the fields of aerospace, electronic components and the like.

The invention discloses a hot chamber high-voltage electrical penetration assembly composite stress aging state evaluation method and a test device, and relates to the technical field of electrical equipment aging tests, and the method specifically comprises the steps: synchronously obtaining the leakage current, the partial discharge amplitude spectrum, the temperature distribution matrix and the high-frequency current spectrum of a to-be-tested electrical penetration assembly; extracting a time domain feature from the leakage current, extracting a frequency domain feature from the partial discharge spectrum, and extracting a space gradient feature from the temperature field; carrying out weighted fusion on the time domain features, the frequency domain features and the spatial gradient features by adopting an attention mechanism; reducing the 128-dimensional features after the attention mechanism fusion to three-dimensional spatial features; processing the fused three-dimensional space characteristics by adopting a bidirectional long-term memory network to obtain a residual life prediction value of the electrical penetration assembly; judging the aging stage of the electrical penetration assembly according to the residual life prediction value; presetting an aging threshold value, and when the predicted aging stage exceeds the threshold value, automatically adjusting the temperature and humidity parameters of the environmental test box to a safe working condition; the method is used for solving the problem that a traditional evaluation result is inaccurate.

The invention discloses a test box for simulating an environment. The test box comprises a box body, a single-stage refrigeration system, a cascade refrigeration system, an environment monitoring system and a control system. The box body comprises a testing space and a working space which are communicated, and the testing space is used for placing a to-be-tested product; the environment monitoring system is used for monitoring the temperature and humidity in the test space; when a first extreme environment of a to-be-tested product is simulated and tested, a control system firstly controls a single-stage refrigeration system to be started and a cascade refrigeration system to be closed, so that the temperature and humidity in a test space reach an intermediate critical environment; and then the control system controls the single-stage refrigeration system to be closed and the cascade refrigeration system to be started, so that the temperature and the humidity in the test space are reduced to the first extreme environment from the intermediate critical environment. According to the scheme, on the basis that the gas environment is not changed, simulation of the extreme environment can be achieved without external connection of other devices, the requirements of the to-be-tested product during environment testing are met, and the testing complexity and the testing cost are reduced.

The invention relates to an environmental test box for realizing high and low temperature rapid alternating circulation, which is mainly applied to the technical field of environmental test equipment. The test box is provided with a high-temperature chamber and a low-temperature chamber which are independent from each other, a thermal insulation layer is arranged between the two chambers, and the test box can respectively keep constant temperature environments at the highest temperature of + 75 DEG C and the lowest temperature of-50 DEG C; during a test, a sample is placed in the test bed, and the rotating shaft structure driven by the motor periodically rotates in a reciprocating manner or rotates in the same direction among different temperature zones, so that high-low temperature rapid alternating circulation is realized. The operation mode of the motor is controlled through the control system so as to simulate the accelerated aging process of the component in the temperature rapid alternating environment. According to the test box, through the design of the control system, the forced convection fan and the middle thermal insulation layer, it is guaranteed that the temperature switching process is rapid, uniform and stable. Compared with the prior art, high and low temperature circulation can be completed without overall heating and cooling of the interior of the test box, and the test box has the advantages of being high in test efficiency, capable of remarkably improving the reliability and accuracy of the high and low temperature alternating circulation test of the sample and the like.

The invention discloses a linear cooling control method of an environmental test box and the environmental test box. The method comprises the following steps: acquiring the temperature in a to-be-controlled environment test box, the suction pressure of a variable-frequency compressor and the exhaust pressure of the variable-frequency compressor; calculating the linear cooling rate of the to-be-controlled environment test box based on the preset temperature parameter; according to the temperature in the box, the suction pressure of the inverter compressor, the exhaust pressure of the inverter compressor and the linear cooling rate, a database is obtained, and the target rotating speed of the inverter compressor, the target opening degree of an electronic expansion valve, the target rotating speed of an evaporator fan and the target rotating speed of a condenser fan of the to-be-controlled environment test box are calculated based on the database; and based on the calculated target rotating speed of the inverter compressor, the target opening degree of the electronic expansion valve, the target rotating speed of the evaporator fan and the target rotating speed of the condenser fan, the inverter compressor, the electronic expansion valve, the evaporator fan and the condenser fan of the to-be-controlled environment test box are controlled to act, so that linear cooling control over the to-be-controlled environment test box is achieved.

The present invention discloses a test device for a tumbling pretreatment stand for bulletproof vests and a method for using the same. The device comprises a base, wherein universal wheels are respectively installed at the corners of the base, the bottoms of the universal wheels are in contact with the inner wall of the bottom of a walk-in environmental test chamber, the surface at one end of the base is connected to the two ends of a push rod, the surface at one end of the base is installed with a driving device, the driving device is connected to a conventional roller through a support plate, the outer ring of the conventional roller is in contact with two groups of symmetrically arranged roller frames, and the outer ring of the conventional roller is equidistantly provided with a plurality of first perforations. The present invention mainly solves the problem that when a combatant wears a bulletproof vest and performs various tactical actions (such as lying down, lying down, and rolling), the bulletproof vest will be deformed with the various tactical actions, causing the combatant to feel uncomfortable or even unable to wear the vest, thereby affecting the combatant's tactical actions and life safety. The present invention also solves the problem of extremely important quality performance testing of bulletproof vests in different battlefield environments.

The invention relates to a self-adaptive control method, system and device for environment test equipment, and the method comprises the following steps: S1, data collection: collecting environment detection data and data of a corresponding actuator according to a to-be-controlled physical quantity; s2, selecting or constructing a control object according to the physical quantity to be controlled; s3, performing online identification operation when an identification condition is met, otherwise, directly executing the step S4; s4, feedforward and feedback: calculating feedforward compensation and feedback compensation according to the value of the to-be-estimated quantity, and superposing the feedforward compensation and the feedback compensation to obtain a control instruction; and S5, performing constraint allocation on the actuator: performing saturation constraint processing on the control instruction to obtain a control quantity of the corresponding actuator. Joint online identification can be carried out on the to-be-estimated quantity only through perturbation excitation; different loads and test object states are automatically adapted; saturation constraint processing is adopted; the model and the algorithm are low in calculation amount, and precision, speed and engineering realizability are considered.

The invention provides a dynamic cooperative control system of a high and low temperature environment chamber and a sunlight simulation system, and belongs to the technical field of environment testing. The system establishes a dynamic coupling model, integrates a plurality of core environment parameters, optimizes a combination problem in a high-dimensional parameter space by adopting a quantum annealing algorithm, and adopts edge computing nodes to realize the dynamic cooperative control of the high and low temperature environment chamber and the sunlight simulation system. And real-time issuing of the control instruction is realized. In addition, the refrigerating / heating power and the illumination intensity are dynamically adjusted through real-time sensor data, and closed-loop control over environmental parameters is achieved. The problem that dynamic environment parameters are difficult to cooperatively adjust in real time due to independent control of a high and low temperature environment chamber and a sunlight simulation system in a traditional environment testing system is solved.

According to the high-voltage wiring harness testing system and the control method thereof, the high-voltage wiring harness testing system integrates the mechanical strength testing unit, the environment testing unit and the electrical performance testing unit, vibration, high-low temperature and strong current can be applied at the same time, electric, thermal and mechanical vibration multi-physical field coupling is achieved, and the testing efficiency is improved. The test units are synchronously controlled by the central control system, so that the actual influence of a multi-scene superposition factor on the wire harness can be simulated; a sensor network in the system collects vibration test data, temperature test data, current test data and insulation performance data in real time and transmits the data to a central control system, and the central control system analyzes the performance of a to-be-tested high-voltage wire harness under the current test working condition by using the test data and then generates a test report. Therefore, the accuracy of the test result and the test efficiency are effectively improved.

The present invention discloses a high-temperature erosion test device and a test method for thermal barrier coatings of gas turbine blades, wherein the high-temperature erosion test device includes a high-temperature spray gun system, a test system, a cooling system, a central control system, and a dust removal system. The test device and the test method provided by the present invention can simulate the high-temperature erosion environment of gas turbine blades under working conditions to the greatest extent, simulate the position, speed, and angle relative to the coating surface of solid particles impacting the surface of the thermal barrier coating, and simulate the service environment in which particles impacting the surface of the thermal barrier coating rebound and impact other positions of the thermal barrier coating or other blade surfaces in different motion states, causing multiple erosion and wear to the coating. The test results can provide a reliable experimental basis for studying the service life of thermal barrier coatings, the selection of thermal barrier coating materials, etc.

The invention discloses a linear cooling control method of an environmental test box and the environmental test box. The method comprises the following steps: acquiring the temperature in a to-be-controlled environment test box, the outlet temperature of an evaporator, the liquid supply temperature of a condenser, the suction pressure of a variable-frequency compressor and the exhaust pressure of the variable-frequency compressor; according to the temperature in the box, the evaporator outlet temperature, the condenser liquid supply temperature, the frequency conversion compressor suction pressure, the frequency conversion compressor exhaust pressure and preset parameters, the frequency conversion compressor rotating speed, the electronic expansion valve opening degree, the evaporator fan rotating speed and the condenser fan rotating speed of the to-be-controlled environment test box are calculated; based on the calculated rotating speed of the inverter compressor, the calculated opening degree of the electronic expansion valve, the calculated rotating speed of the evaporator fan and the calculated rotating speed of the condenser fan, the inverter compressor, the electronic expansion valve, the evaporator fan and the condenser fan of the to-be-controlled environment test box are controlled respectively, and linear cooling control over the to-be-controlled environment test box is achieved.

The invention relates to the technical field of electrical detection, in particular to a multi-stress coupling environment reliability testing method for an electricity consumption information acquisition terminal. Comprising the steps of applying a combined stress field to an electricity utilization information acquisition terminal through an environment test box; acquiring power utilization information acquisition terminal parameters; the method comprises the following steps of: capturing metering pulse response and carrier communication interaction signals of an electricity utilization information acquisition terminal under the excitation of a combined stress field by utilizing an electrical sensor, extracting carrier signal-to-noise ratio data and metering reference drift data, and generating a reference voltage compensation coefficient and an impedance matching threshold value; projecting the carrier signal-to-noise ratio data to an impedance matching threshold value, and constructing a stress failure envelope surface according to a hardware overload protection threshold value; and mapping the communication quality distortion residual vector to a stress failure envelope surface, and calculating a reliability life prediction value. According to the method, a uniform excitation environment is constructed, and performance degradation of different dimensions is uniformly quantified into accumulative stress damage integral, so that the comprehensive anti-interference capability of the terminal in a multi-stress coupling environment can be truly reflected.

The invention provides a high-low temperature composite environment sensitive fracture test system. The high-low temperature composite environment sensitive fracture test system comprises a fracture testing machine, a high-low temperature composite salt spray test box and a host control cabinet, a test cavity of the high and low temperature composite salt spray test box is arranged in the environment sensitive fracture testing machine; a test piece is located in a test cavity of the high-low-temperature composite salt spray test box, and a high-low-temperature alternating corrosion environment is achieved through the damp and hot module, the low-temperature module and the spraying device. Salt mist, damp and hot, dry and low-temperature test sections are set through a control system, the time and the cycle index of each test section are adjusted, a high-low temperature composite salt mist environment is formed, and an environment sensitive fracture test in a multi-factor coupling environment can be achieved in cooperation with an environment sensitive fracture testing machine. The device is flexible in structure, large in adjustable range and high in test efficiency, test space is saved, and according to service environments of material test pieces under different working conditions, the environment sensitive fracture performance of materials can be examined in a multi-level mode by compositing multiple test environments, adjusting environment test parameters and simulating a real service environment.

To propose an environmental test device that can suppress a change of pressure in a laboratory when changing the environment within the laboratory.SOLUTION: An environmental test device 1 that can switch the inside of a laboratory 3 between a high-temperature environment and a low-temperature environment has inside / outside opening and closing means 18 that opens and closes the space between the inside of the laboratory and the outside, and has at least one of first control means that performs first control that sets a time zone in which high-temperature side opening and closing means 10 is closed during high-temperature / low-temperature shift during which the inside of the laboratory is switched from a high-temperature environment to a low-temperature environment, and in which the inside / outside opening and closing means 18 and low-temperature side opening and closing means 11 are open at the same time, and second control means that performs second control that sets a time zone in which the low-temperature side opening and closing means 11 is closed during low-temperature / high-temperature shift during which the inside of the laboratory is switched from the low-temperature environment to the high-temperature environment, and in which the inside / outside opening and closing means 18 and the high-temperature side opening and closing means 10 are open at the same time.SELECTED DRAWING: Figure 3

The embodiment of the invention discloses a linear cooling control method for an environmental test chamber, which comprises the following steps of: determining the rotating speed of a variable-frequency compressor of each equally divided cooling section according to a cooling theoretical parameter of each equally divided cooling section, a second cooling parameter of the environmental test chamber, a linear cooling rate and an operating parameter of the variable-frequency compressor; according to the cooling theoretical parameter of each equally divided cooling section, the third cooling parameter of the environmental test box, the linear cooling rate and the electronic expansion valve operation parameter, determining the electronic expansion valve step opening of each equally divided cooling section; according to the first operation data of the inverter compressor and the evaporator in each equally divided cooling section, the final temperature of the environmental test box, the operation parameters of the evaporator fan and the linear cooling rate, the rotation speed of the evaporator fan in each equally divided cooling section is determined; and according to the second operation data of the inverter compressor and the condenser in each equally divided cooling section, the operation parameters of the condenser fan and the linear cooling rate, the rotating speed of the condenser fan in each equally divided cooling section is determined.

The invention belongs to the technical field of low-temperature facility environment testing, and discloses a temperature and pressure environment test chamber and a test method thereof. The main body of the temperature and pressure environment test chamber is a test chamber body, and an external gas inlet branch on the test chamber body is used for conveying gas to the test chamber body; the air pressure adjusting branch is used for adjusting the pressure of the air inlet branch; the exhaust branch is used for exhausting gas in the test cabin body; the circulating gas branch is used for gas circulation in the test cabin body; the liquid nitrogen injection branch comprises a liquid nitrogen injection branch and a liquid nitrogen discharge branch, the liquid nitrogen injection branch is used for injecting liquid nitrogen into the test cabin, and the liquid nitrogen discharge branch is used for discharging nitrogen of the liquid nitrogen buffer tank. The test method comprises an air temperature and pressure environment test method and a nitrogen temperature and pressure environment test method. The temperature and pressure environment test chamber and the test method thereof are applied to the field of large low-temperature facilities and the field of temperature and pressure test such as aerospace exploration, plateau environment and high-altitude environment, and have practical value.

The invention relates to the field of automation, and discloses an EMS test method and system for a PLC, and the method comprises the steps: obtaining the basic EMS data and data fluctuation characteristics of a to-be-tested PLC according to the equipment parameters of the to-be-tested PLC; collecting electromagnetic interference data of the target environment, obtaining electromagnetic interference characteristics of the target environment according to the electromagnetic interference data, generating a target environment test case according to the electromagnetic interference characteristics of the target environment and the basic test case, and dividing the to-be-tested PLCs completing the basic test into an experiment test group and an environment test group; and if the use electromagnetic immunity of the target environment is consistent with the experimental electromagnetic immunity of the target environment, obtaining the electromagnetic immunity of the to-be-tested PLC and the updated target environment test case. According to the method, the cloud database and the real-time electromagnetic interference data are combined to generate the customized test case for the target environment, so that the accuracy and practicability of the EMS test are remarkably improved.

The invention provides a roadbed top surface equivalent maximum bearing capacity determination method and device considering a seasonal effect, and relates to the technical field of road engineering.The method specifically comprises the steps that firstly, a sample is manufactured based on a roadbed to be evaluated, and an environmental parameter combination is randomly generated according to the annual seasonal parameter range; constructing a simulation environment test to obtain related parameters and roadbed top surface equivalent maximum bearing capacity, constructing a response prediction model through data driving, weighting roadbed characteristics and response parameters, analyzing to generate a comprehensive evaluation coefficient, comprehensively evaluating roadbed performance, and optimizing an environment parameter combination by using a genetic algorithm in combination with the response prediction model. And constructing a bearing capacity prediction model by means of a long-short-term memory network, and dynamically predicting the equivalent maximum bearing capacity of the roadbed in the current time period. According to the method, the defects of static analysis in the prior art are overcome, and the problem that the result is inaccurate due to inconformity between reality and hypothesis in the prior art is solved.