31results about How to "Controllable test conditions" patented technology

The invention discloses a micro-surfacing mixture noise indoor-test method which relates to a micro-surfacing mixture noise test method, aiming at solving the problems in the prior art that micro-surfacing road noise is difficulty tested, evaluated and estimated with effectiveness before the construction, and the selection of micro-surfacing mixture gradation is not benefited. The test method mainly comprises the following steps of: 1, selecting a lab; 2, preparing a micro-surfacing mixture test piece; 3, mounting the test piece; 4, selecting and mounting a sound level meter; 5, pretreating the test piece, checking a wear tube before test, replacing the wear tube and then starting the test if the wear tube is severely worn, starting a wet wheel abrader in order to avoid instability in operation when the instrument is started, so that the wear head rotates for 10 seconds and stops, and slightly brushing worn floating particles which float on the surface of the test piece; 6, performing data acquisition, and testing an equivalent sound level value of the average noise level; and 6, checking the data validity. The method is used for testing and evaluating the micro-surfacing mixture noise.

An unmanned vehicle in the development process requires a large number of experiments to verify whether the intelligent decision-making level has reached the conditions of completely autonomous driving. An unmanned vehicle test platform is used for providing simulation test scenes for the unmanned vehicle. The unmanned vehicle test platform comprises a main control computer, a projector, a motionsimulation platform, a motion simulation platform controller, the unmanned vehicle and a switch, wherein the motion simulation platform controller is connected with the motion simulation platform, theunmanned vehicle is arranged on the motion simulation platform, the main control computer is used for coordinating normal operation of all the parts of the platform, functions include generating simulation traffic scenes, communicating with the unmanned vehicle through the switch, transmitting the gesture information to the motion simulation platform controller and recording test data in the testprocess, and the projector is used for projecting the simulation traffic scenes generated by the main control computer onto a screen. The unmanned vehicle test platform is advantaged in that virtualtraffic scenes are used instead of the traditional actual road test environment, test conditions are controllable, and the emergency handling ability of the unmanned vehicle can be tested.

The invention discloses a test device used for testing resistance reduction performance of an antifouling coating. The device comprises three units, respectively a resistance test box, a navigation simulation test device and a software control system. The resistance test box comprises a load bearing, a connecting shaft, a sample loading device, a torque sensor and a test tank; the connecting shaft is sequentially provided with a motor, a connector A, a torque sensor, a connector B, a load bearing and a sample loading device from the top bottom; the test tank is located below the connecting shaft; and the navigation simulation test device is composed of a plurality of independent navigation simulation test boxes, each independent navigation simulation test box is internally provided with a motor rotation drive, and the navigation simulation test box is internally provided with sea water. Through controlling changes and frequencies of factors such as the flow speed and the temperature, different turbulence states are formed, resistance changes of the energy-saving resistance-reduction coating in ship navigation simulation state can be tested, and the resistance-reduction effects of the coating can be evaluated.

The invention discloses an efficient identification method for the drought resistance ability of alfalfa varieties. The method comprises the following steps: carrying out polyethylene glycol PEG-6,000-simulated drought stress treatment; measuring physiological indexes with the most sensitive change and sensitive thresholds of the alfalfa varieties with different drought resistance levels when responding to different stress intensity; building sensitive physiological index groups and sensitive threshold index systems corresponding to the drought resistance levels of the alfalfa varieties; and dividing to-be-identified alfalfa varieties into high drought resistance, medium drought resistance and low drought resistance. According to the identification method, when the drought stress is simulated by different concentration of PEG-6,000, the sensitive physiological index groups and the sensitive threshold index systems corresponding to the drought resistance levels are built on the basis of physiological indexes which are closely related to the alfalfa varieties with different drought resistance levels and the sensitive thresholds as identification bases, and the drought resistance ability of the alfalfa is graded, so that the comprehensive evaluation result of the drought resistance of the alfalfa is improved, the method has good operability and reliability, identification of the drought resistance can be completed in a laboratory, the conditions are easy to control and the cost is low.

The invention discloses a system for measuring the comprehensive radiation absorption coefficient of the surface of a building material. The system comprises a thermal insulation box, a solar total radiation sensor, an anemometer, a small automatic weather station, a thermocouple temperature sensor, an air temperature sensor, a water temperature sensor and a building materials test piece. The building material test piece and the thermal insulation box form a closed box, and the water temperature sensor is arranged in the box; the thermocouple temperature sensor is arranged on the surface of the building material test piece; the air temperature sensor is arranged in a test environment; the solar total radiation sensor and the anemometer are arranged nearby the building material test piece;the total solar radiation sensor is used for detecting the total solar radiation quantity; the anemometer is used for detecting the speed of wind flowing through the outer surface of the building material test piece; and the small automatic weather station is used for collecting and storing data in real time. The comprehensive radiation absorption coefficient is directly measured in a natural environment in order to well simulate the radiant heat behavior of an actual engineering structure material in a service environment.

The invention discloses a building material surface radiation absorption coefficient calculation method considering long and short wave difference, which comprises the following steps: S1, putting a building material test piece wrapped by a thermal insulation box in a surrounding open and unshielded natural environment, and establishing a thermal boundary equilibrium equation when only the upper surface of the building material test piece is in contact with the surrounding environment; s2, recording related data; s3, selecting a certain time period in the time section of continuous heating or continuous cooling of the building material test piece, and calculating the thermal change quantity Qs, the convective heat exchange quantity Qc and the thermal radiation quantity Isr of the building material test piece; s4, in a natural environment which is cloudy and rain-free at night and is open and free of shielding, the quantity of direct solar radiation and scattered solar radiation is zero, and the long-wave radiation absorption coefficient of the outer surface of the building material test block is calculated through a transformation formula; and S5, selecting system heat exchange in a certain time period in a natural environment which is sunny in the daytime and is open and unshielded in the surrounding, recording related data, and calculating the short-wave radiation absorption coefficient of the building material test piece.

The invention relates to a metal hose flow characteristic testing device and method. Each of front and back pressure difference current stabilizing tubes of the device is communicated with the two ends of multiple parallel pressure difference testing pipes, the back pressure difference current stabilizing tube is connected to a pressure stabilizing water tank, an outlet of the pressure stabilizingwater tank is connected to multiple parallel flow testing pipes, and each flow testing pipe comprises front and back flow current stabilizing tubes; a heating device is installed in the pressure stabling water tank, and forms cooling circulation together with a cooling set; the signal output end of each of an upper pressure sensor, a lower temperature sensor, a pressure difference sensor and a flowmeter is connected with the controlled ends of a pressure regulator valve, the heating device and the cooling set via a control unit; a pressure difference and flow selected control output end of the control unit end is connected to the controlled end of a pressure difference selected control valve and a flow selected control valve; and the control unit includes an intelligent device and a display device. Thus, influence of temperature instability on flow resistance can be avoided, the proper control selective pipe can be selected automatically, an accurate test structure is obtained, and the working efficiency is improved.

The invention discloses a stability index test platform of a mountain crawler tractor. The test platform is composed of a mechanical system, an image collection system, a light supplementing system, and a data acquisition and analysis system. The mechanical system consists of a hydraulic power console, a hydraulic cylinder, a soil tank and soil. The image collection system includes a camera console and an industrial camera group. The light supplementing system is a high light lamp group. The data acquisition and analysis system includes a dynamic signal test analyzer, a synchronous clock signal generator, a pressure sensor network, and an upper computer. According to the invention, the test platform can be applied to stability testing of a mountain crawler tractor on the slope working condition; and the real-time collection, real-time storage, real-time display, and real-time analysis of the mechanical performance index and related data of the tractor on the slope condition can be realized. Therefore, the stability index test platform having high practicability has the great promotion and application value.

The invention discloses a measurement system for a building material surface convective heat exchange coefficient. The measurement system consists of a thermal insulation box, industrial fan, an anemometer, a small automatic weather station, thermocouple temperature sensors, an air temperature sensor, a water temperature sensor and a building material test piece. Thermal insulation box and the building material test piece compose an enclosed box; the water temperature sensor is disposed in the thermal insulation box; the thermocouple temperature sensors are disposed on the surface of the building material test piece; the air temperature sensor is arranged in an external environment; and the thermocouple temperature sensors, the air temperature sensor, the water temperature sensor and the anemometer are all connected to the small automatic weather station for real-time acquisition and storage of test data. Based on the theory of heat transfer, the measurement system and method providedby the invention can achieve efficient, simple and accurate measurement of the convective heat exchange coefficient between a building material and the external environment, also take the heat absorption and heat release processes into account, can better simulate the thermal behavior of an actual engineering structural material in a service environment, and have good application prospects.

The invention discloses a mechanical property testing bench for a hilly area crawler tractor. The mechanical property testing bench consists of a mechanical system, a camera system, and a data collection and analysis system, wherein the mechanical system comprises a hydraulic power control panel, a hydraulic cylinder, a soil tank and soil; the camera system comprises a high-speed camera, an endoscope control panel and an industrial endoscope; the data collection and analysis system comprises two dynamic signal test analyzers, a synchronous clock signal generator, a single-layer pressure sensornetwork, a multi-layer pressure sensor network and an upper computer. The mechanical property testing bench for the hilly area crawler tractor has the advantages that the mechanical property testingbench can be applied to the stability test and the traction and attachment property test of the hilly area crawler tractor under the working condition of hilly area, and various mechanical property indexes and related data of the tractor under the working condition of hilly area can be collected, stored, displayed and analyzed in real time; the practicality is strong, and the popularization and popularization value is stronger.

The invention discloses an indoor soil explosion dust test system, which belongs to the technical field of explosion testing. The system includes an explosion hole, an explosion subsystem, a flash X-ray subsystem, a high-speed camera subsystem, a laser transmission characteristic test subsystem and a trigger device. The explosion hole has a double-layer structure inside and outside; the explosion subsystem is set in the inner layer of the explosion hole to generate soil explosion dust; the flash X-ray subsystem can capture the dust image of the soil explosion at a specific moment in the early stage of the explosion; the high-speed camera subsystem can record The dust diffusion process of the soil explosion; the laser transmission characteristic test subsystem can collect and store the echo data of the laser in the dust environment of the soil explosion; the trigger device can realize the simultaneous triggering of each subsystem. The invention can not only record the diffusion process of the soil explosion dust, but also obtain the echo data of the laser in the soil explosion dust environment, the test environment condition is controllable, the test is safe and the cost is low.

The invention discloses a mountain caterpillar tractor traction adhesion performance test platform. The test platform is composed of a mechanical system, a camera system, a lighting system and a dataacquisition and analysis system. The mechanical system includes a hydraulic pump station, a hydraulic cylinder, a soil groove and soil; the camera system includes a camera console and industrial camera groups; the lighting system includes strong light groups; the data acquisition and analysis system includes two dynamic signal test analyzers, a USB3.0 hub, a synchronous clock signal generator, pressure sensor networks and an upper computer. The mountain caterpillar tractor traction adhesion performance test platform can be used for a traction adhesion performance test of a mountain caterpillartractor under slope working conditions and determination of correlated parameters, real-time acquisition, real-time storage, real-time display and real-time analysis of mechanical performance indexesand correlated data of the tractor under the slope working conditions can be achieved, the practicality is high, and the popularization and application value is high.