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1517results about How to "The testing process is simple" patented technology

Dual-redundancy autonomous flight control system for micro-miniature unmanned helicopters

The invention discloses a dual-redundancy autonomous flight control system for micro-miniature unmanned helicopters, which comprises an airborne control system and a ground remote control and remote measuring system, wherein the airborne control system acquires the flight data of a helicopter, controls the unmanned helicopter to fly in accordance with scheduled subjects according to a flight control algorithm, and sends the flight data and algorithm results to the ground remote control and remote measuring system through an airborne data transfer radio in the airborne control system; and the ground remote control and remote measuring system receives the data sent by the airborne control system, displays the data through a ground station so as to enable ground experimenters to know the flight and control states of the helicopter, and uploads a control instruction in real time through the ground station so as to adjust and change the flight subjects and control state of the helicopter. According to the invention, the autonomous capacity of small unmanned helicopters can be improved, and the reliability of the system can be increased; and especially, when a flight control computer has failures, the safety of a test platform can be ensured to the maximum extent.
Owner:BEIHANG UNIV

Device and method for testing low-permeability core starting pressure gradient at high temperature and high pressure with unsteady state method

The invention discloses a device and a method for testing a low-permeability core starting pressure gradient at the high temperature and the high pressure with an unsteady state method. The method comprises steps as follows: a to-be-tested low-permeability core sample is prepared and placed in a core holder; an automatic water pump is used for providing required confining pressure and return pressure for the core holder; a third valve is closed, and a gas pressurization device is used for pressurizing a standard bottle; after a second pressure sensor stably reads, the third valve is opened, and gas in the standard bottle permeates an inlet of the core holder; a controller records a pressure value, changing over time, read by the second pressure sensor and stops recording until the change rate of a reading number of the second pressure sensor is lower than a threshold value; and the core starting pressure gradient is calculated according to the reading number, changing over time, of the second pressure sensor. According to the device and the method, all that is required is to add a high-precision pressure sensor at an outlet of the standard bottle for recording pressure of the outlet, the high-precision pressure sensor has characteristics of low cost, high test precision, large range and the like, and the measurement problem of low flow speed is solved.
Owner:SOUTHWEST PETROLEUM UNIV

Experiment-numerical analysis combined determination method for relative permeability coefficient of unsaturated soil

The invention relates to an experiment-numerical analysis combined determination method for the relative permeability coefficient of unsaturated soil. The method comprises simple experiment tests and numerical analyses, the relative permeability coefficient equation of soil under unsaturated state is obtained via simple laboratory experiments and numerical optimization fitting analyses, therefore, the relative permeability coefficient of the unsaturated soil is obtained by calculation. The method is mainly suitable for cohesive soil with a small permeability coefficient. At the same time, the invention provides a numerical analysis procedure which comprises a basic analysis module and an optimization back analysis module, wherein the basic analysis module simulates the dehydration process of test specimens under the condition of a given boundary; the optimization back analysis module takes a determined dehydration mass-time curve as basic input to confirm two parameters Pr and m describing the changes of the relative permeability coefficient of the unsaturated soil along with saturation via an orthogonal optimization method in the numerical analyses. The method is simple in experiments, convenient to operate, wide in usable ranges and good in accuracy; the determined relative permeability coefficient equation can be directly applied to soil engineering structure analyses.
Owner:SHANDONG AGRICULTURAL UNIVERSITY

Method, device and system for testing web page

The invention discloses a method, device and system for testing a web page. The method comprises the steps that the web page to be tested, the URL of the web page to be tested, page controllable elements extracted from the web page to be tested and the page logical description information of the web page to be tested are sent by a client side and received by a web page test server, and the URL and the page controllable elements of the web page to be tested are added to a page element base; the web page test server generates a graphic user interface according to the page logical description information of the web page to be tested and the page element base; an instruction for selecting the page controllable elements in the web page URL is received, the corresponding page controllable elements in the web page URL are selected from the page element base according to the instruction through the graphic user interface, and a test script is generated according to the page logical description information; the web page test server sends the generated test script and the web page to be tested to a tester for web page testing, web page logic is tested through the graphical test scheme, and the threshold of the web page logic testing is lowered.
Owner:TENCENT TECH (SHENZHEN) CO LTD

Binocular photogrammetry method of large flexible structure vibration displacement

The invention provides a binocular photogrammetry method of large flexible structure vibration displacement, and belongs to the technical field of flexible structure dynamic analysis and measurement. The binocular photogrammetry method of large flexible structure vibration displacement aims to solve the problem that the existing contact measurement impacts performance of a flexible structure. Firstly, industrial cameras are demarcated; then, shock excitation is conducted on the flexible structure to be tested, all the industrial cameras are controlled to be triggered synchronously through a single-chip microcomputer, and shooting of vibration displacement is conducted on the point to be tested of the flexible structure to be tested; next, images obtained by shooting of all the industrial cameras are dealt with, pixel coordinates of the point to be tested are obtained through an angular point detection algorithm, object space coordinates of the point to be tested at each point of time are obtained through a binocular three-dimensional reconstruction technology, and thus the vibration displacement curve of the flexible structure to be tested is obtained. The binocular photogrammetry method of large flexible structure vibration displacement is applied to measuring vibration displacement of the flexible structure.
Owner:HARBIN INST OF TECH

Simple carrier rocket launching system

The invention discloses a simple launching system for measuring and launching a carrier rocket. The simple carrier rocket launching system comprises multiple adapter plates fixedly connected with the ground; levelling support legs and a speed reducer are sequentially arranged on the multiple adapter plates from bottom to top; the speed reducer is fixedly connected with the lower surface of a table body; an operation platform is arranged on the upper surface of the table body; multiple support devices are uniformly distributed on the circumferential direction of the operation platform; the support devices are used for supporting the carrier rocket; the simple launching system also comprises an electrohydraulic control system for controlling the speed reducer to act so as to drive the levelling legs for levelling. The simple carrier rocket launching system is simple in structure and good in machining manufacturability; when being overturned, erected and vertically positioned on a launcher, the rocket can be secondly finely tuned by the levelling support legs; the use is convenient, the measuring and launching process of the carrier rocket is simplified, and the response and adaptivity capacities of the launching task are improved; the simple carrier rocket launching system can be used in a site with easy facilities for performing a simple, fast and automatic measuring and launching task; the simple carrier rocket launching system has a function of being used repeatedly for multiple times, and has the advantages of high safety and reliability and the like.
Owner:GUIZHOU AEROSPACE TIANMA ELECTRICAL TECH

System and method for testing dynamic friction parameter

The invention discloses a test system and method of dynamic friction parameter, the test system is characterized in that's: an absolute encoder 14 is arranged on a motor 13, a moment sensor 4 is arranged axially between a test part, a weight fixing device 6 and a locking mechanism 2, the test part is arranged at upper and lower layers of the weight fixing device, when testing, the operation of the motor is controlled by a controller, moreover the parameters including the sampling time, friction moment, rotating speed, rotating angle and motor winding current are recorded synchronously, the evaluated value of current friction parameters are set at Sigma 0, Sigma 1, Fc, Fs, Omegas, and Sigma, and then differential equation of systematic movement is solved so as to obtain the evaluated value Theta(t) of moment motor rotating angle of each sampling time, thereby respectively calculating the errors of the evaluated values of the moment motor rotating angle and the friction moment of each sampling time, the error parameters are contrasted with the set testing parameters so as to meet the required evaluated value of the output friction parameters, otherwise correction is re-made. The test system and method of dynamic friction parameter has the advantages of convenient testing and high precision. The test system is applicable for dynamic friction parameter test on various materials.
Owner:XIDIAN UNIV
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