33results about How to "Long test cycle" patented technology

The present invention relates to a kind of dynamic monitoring method of aircraft structure fatigue test measurement data, it is characterized in that, comprises the following steps: Step 1, carry out static strain displacement measurement; Step 2, establish static strain displacement measurement basic data template; Step 3, Carry out fatigue strain displacement measurement; step 4, establish a basic data template for fatigue strain displacement measurement; step 5, conduct a formal fatigue test and perform static error calculation and judgment; step 6, conduct a formal fatigue test and perform fatigue error calculation and judgment. The theoretical basis used in the invention is correct, the implementation steps are clear and simple, the computer is easy to control and implement, and the engineering concept is clear. The proposal of the invention solves the problem that it is difficult to determine whether the test runs normally in the aircraft structure fatigue test.

The present invention provides a method and a device for compressing non-constant amplitude domain data. The method determines whether a small load event is in an ascending load event or a descending load event in the rain flow counting statistics. If the small load event is a small load event in the ascending load event and the small load event is smaller than a minimum stress range, a half cycle of the period in which the small load event is counted in the rain flow counting statistics is removed. If the small load event is a light load event in the descending load event and the product of the small load event and the empirical parameter is less than the minimum stress range, a half cycle of the period in which the small load event is counted in the rain flow counting statistics is removed. The non-constant amplitude data compression of different load events is realized. Under the premise of fatigue damage equivalence, the compression efficiency is improved and the test period is shortened.

The present invention relates to a system for evaluating the environmental stress cracking resistance of a polyethylene resin, wherein the system comprises the aqueous solution of a nonionic surfactant and an anionic surfactant, and further has the following advantages that 1) the electrostatic stability of the mixed surfactant is improved to make the active agent molecular chain easily form micelles so as to provide a synergistic effect and substantially improve the efficiency of the surfactant; and 2) the surfactant component cannot release nonylphenol and other components toxic and harmful for human body during the use process, such that the advantages of safety and environmental protection are provided.

The invention discloses a multi-physics coupling field calculation method of a reflector antenna, relates to the technical field of reflector antenna analysis, and aims to provide a calculation method with high precision, no conversion error and strong practicability. The present invention mainly includes the following processes: establish models and assign values ​​in the fluid field and temperature field respectively, enter the solid field analysis after format conversion, obtain surface precision under different working conditions, and then perform surface precision synthesis; deformed reflective surface and The results of the feed vector are superimposed, imported into the high-frequency electromagnetic EDA software, and the boundary of the reflective surface is determined, and the data points of the reflective surface are interpolated to form a continuous reflective surface, and the calculation parameters are set. After calculation, the final electromagnetic result. The invention effectively integrates multi-field coupling analysis, and is especially suitable for the design, index budget and strength check of various reflector antennas.

The invention belongs to the technical field of electronic parking of passenger cars, and specifically relates to a simulation and testing method of a functional mode of an electronic parking system. This method uses a rapid prototyping system to replace the ECU, using a real EPB sample and a virtual electronic parking switch. The control method is as follows: the upper computer sends control signals (including EPB switch mode signals, etc.) The forward and reverse signals are sent to the driving end of the rapid prototyping system, and the driving end of the rapid prototyping system sends the EPB motor circuit current signal to the signal acquisition module, and the current digital signal is sent back to the mode control module by the signal acquisition module, forming a closed-loop control, driven by the rapid prototyping system The terminal drives the EPB to work to realize the emulation of the EPB function mode. The measurement of the EPB functional mode is realized by the clamp release time measurement module.

The invention discloses a device and a method for testing the corrosion of electrically accelerated concrete under a high hydraulic gradient. The device comprises a test chamber, an external pressuremachine, an external power supply and test electrodes, wherein the test chamber is internally provided with at least one pressure test cabinet, a test piece fixing groove is formed in the middle partof the pressure test cabinet, and a concrete test piece is used for partitioning the pressure test cabinet into a positive electrode test area and a negative electrode test area; the test electrodes comprise a test positive electrode and a test negative electrode, the test positive electrode is arranged inside the positive electrode test area, the test negative electrode is arranged inside the negative electrode test area, and each of the positive electrode test area and the negative electrode test area is filled with a conductive corrosion solution; the external pressure machine is connectedwith a pressure pipeline, and the other end of the pressure pipe stretches into the conductive corrosion solution in the positive electrode test area; and drainage sampling pipes are arranged at the bottom of the positive electrode test area and the bottom of the negative electrode test area respectively. The influence of permeating corrosion for concrete performance can be tested under long-termconstant high hydraulic gradient effect, related test data can be measured, and concrete corrosion test research is carried out.