The modeling theory and techniques are studied here. The RBE3 element in NASTRAN is used to simulate the liquid propellant and a DMAP program is compiled to condense the matrix and abstract the model mass matrix. At last the correlation calculation is done between the analysis mode and test mode for CZ-2E/A scaled model rocket.
The main research include as follows:The virtual prototyping model has been built,and on the platform of ADAMS the dynamic property of virtual prototyping of V-22 1/5 scale model’s rotor and wing system have been simulated and studied, according to the compared result to show the feasibility to analyze the tilt-rotor with the technology of virtual prototyping.
Proceeds in the laboratory 1:10 of reduced scale ratio model test, make use of the underground protecting structure for procedure, right different form of FEM of LS- DYNA to proceeds to experiment at the same time different from numerical research that imitate, contrast under the same charge measure the term various protecting structure of respond to.
Thirdly, in order to validate the validity of results of analysis and computation, under the circumstance of normal room temperature and pressure, the acoustic experiment for scaling model of combustion chamber is performed, thereby the experimental result of acoustic oscillation frequency is obtained.
The association between the mother's grand multiparity and the offspring's adult hospital-treated psychiatric morbidity was analysed using a continuation ratio model, which is a modification of logistic regression.
Elasto-plasticity critical corrosive ratio model for RC structure corrosive expanding crack
We have concluded elsewhere that the sex ratios of this species cannot be satisfactorily explained by any general sex ratio model that is available.
Using ratio imputation method, the estimators of the current population mean are proposed, which are valid under uniform response regardless of the model and under the ratio model regardless of the response mechanism.
In addition, a non-linearf-ratio model is given which may be useful in practical studies on new production in Jiaozhou Bay.