2results about How to "Save test time" patented technology

The invention belongs to the technical field of aircraft fire extinguishing design, and provides a large amphibious aircraft water throwing efficiency data expansion method, which comprises the following steps: carrying out a pre-flight test of an aircraft to obtain test state points of aircraft water throwing efficiency, including typical test state points and atypical test state points; carrying out water throwing efficiency tests on different test state points, summarizing and analyzing test data, carrying out water throwing efficiency tests on test state points corresponding to invalid data again, summarizing the test data again, and fitting the test data to obtain different water throwing efficiency relation curves; and typical test state point results are extracted to fit coefficients of the water throwing efficiency relation curve, the coefficients are combed, a change relation curve of the water throwing efficiency and different test state points is constructed, and a change curve of the water throwing efficiency along with the water throwing height under each test state point of the airplane is expanded. According to the method, data validity judgment can be improved, the test process is accelerated, and unpredictability of environment variable control caused by an overlong test period is avoided.

The application relates to the technical field of metal plastic forming, and discloses a method and system for establishing a fracture model of metal hot forming under a complex stress state. According to the stress state evolution of a weak area in a forming process of a feature component, a sample structure and a test device which can reproduce the stress state are constructed, a simulated fracture test is carried out based on the material temperature and the deformation rate in the forming process of the complex component, and the fracture model of the metal material in the hot forming under the complex stress state is obtained by combining a basic fracture model determined by critical damage values of different fracture models under different stress states and parameters obtained by the simulated fracture test. The fracture model of the hot forming under the complex stress state can predict cracking defects in the hot forming process of the metal under the complex stress state, a scientific basis for quickly determining a reasonable forming process is provided, and test cost and time are saved.