3,175 research outputs found
Dynamic model establishment of a deployable missile control fin with nonlinear hinge
No full textA deployable missile control fin has some structural nonlinearities because of the worn or loose hinges and the manufacturing tolerance. The structural nonlinearity cannot be eliminated completely, and it exerts significant effects on the static and dynamic characteristics of the control fin. Thus, it is important to establish the accurate deployable missile control fin model. In the present study, the nonlinear dynamic model of the deployable missile control fin is established. The deployable missile control fin can be subdivided into two substructures represented by linear dynamic models and a nonlinear hinge with structural nonlinearities. From dynamic tests, the nonlinear hinge parameters are identified and the nonlinear hinge model is established by the use of a system identification method such as the force-state mapping technique. The substructure modes are improved by the use of the frequency response method. The substructure models and the nonlinear hinge model are coupled to establish the nonlinear dynamic model of the fin by the use of the expanded substructure synthesis. Finally, the established nonlinear dynamic model of the deployable missile control fin is verified by modal and dynamic tests. The established model is in good agreement with test results, showing that the present approach is useful in aeroelastic stability analyses such as time-domain nonlinear flutter analysis
Chosen logistics processes in Škoda JS
No full textThis master thesis deals with the purchase and sale process in Škoda JS company. The aim of this work is to assess whether the setting of the purchase and sale process is met by the company also within a real business case, in compliance with set controls, and whether the degree of perfect delivery is sufficient. In the introduction, the author specifies the basic terms: logistics, logistic chain, customer benefits, information systems in logistics, buying and selling. The following chapter introduces Škoda JS company, including the sphere of its entrepreneurial activity. This chapter also deals with the nuclear power industry. In the crucial chapter, the author describes the process of purchase and sale in Škoda JS company and compares it with a real business case. In conclusion, the author evaluates discrepancies and suggests recommendations to avoid them
Estimation of expected utility gained from the helmet law in Taiwan by quality adjusted survival time.
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Using hierarchical modeling in genetic association studies with multiple markers: application to a case-control study of bladder cancer
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