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The model of steering gear hydraulic system is established based on the analysis that the working principle of the pump-control type steering gear, and the model combined with Nomoto ship model, the influence of the interference for the marine navigation was fully considering, the design of the automatic steering control system was complete. The mathematical model of oil pump flow, the flow balance...
The injury outcomes in side impact are correlated to the door trim design, vehicle motion, as well as the side restraint system. A well controlled side intrusion can vastly reduce the injury index of the thorax, abdomen during the side impact. For the safety issue, it is essential to know the sensitivity of side structure's intrusion velocity upon occupant injury in side impact. Objective: This paper...
The Q1 dummy FE model was used to analyze different restraint paths of a G0+ group of CRS based on UN R129 rear facing sled test method. Four difference seatbelt restraint paths of the rear facing CRS were analyzed and the displacement of the CRS and physical injury parameters of Q1 dummy were compared. The results showed that the head maximum displacement of Q1 dummy was reduced by 35.05 mm and chest...
Vehicle safety airbags can protect occupants from vehicle collisions, but there are still some shortcomings, thus need to be constantly improved. In occupant restraint system simulation, the establishment of a reasonable airbag model determines whether the simulation results are consistent with the actual test results. The aim of this study is to establish a precise airbag model for vehicle occupant...
The efficiency of communication system is the key factor for the operational capability of naval ship. Through analyzing the evaluation index of naval fleet's communication system, a satisfactory-degree based on efficiency evaluation model is founded by applying the grey relational analysis. The steps of the model include gathering index data based on index tree, constituting the reference sequence...
In this paper, an approximate formula for the value of American option with a stock price driven by a geometric fractional Black-Scholes model is derived. A special case of the model would be the model driven by the standard Brownian motion.
A dynamic analysis model of the novel lander is created, and all possible landing conditions at touchdown are considered. Through analyzing the landing process of free-fall landing mode, some shortcomings are found. To improve the landing stability of the novel lander, low-speed landing mode is proposed, namely, the main engine and attitude control engines are switched off soon after the lander is...
Given to the specificity of positioning in fire ground, inertial navigation positioning technology based on Pedestrian Dead Reckoning (PDR) is most widely used. Stride estimation algorithm is the core of PDR. In order to improve the accuracy of it, in this paper, we selected three factors of stride (acceleration amplitude, step frequency and height) to build an empirical model for stride estimation...
The calculation results of the embedded real-time system correctness depends not only on the logical system, and the results also spent time, the system must ensure in response to external events in a predictable period of time. Worst Execution Time (the worst case execution time (Case) is the maximum execution time of the program in the process of running. It plays a very important role in the research...
Mountainous terrain is very complex. Although there are a lot of randomness on the surface features, but also have a certain correlation. Based on the basic features of the mountainous terrain, the wavelet analysis is introduced to the high frequency part of the mountain area, and the whole fluctuation part corresponds to the low frequency part, and the terrain analysis model is established. The wavelet...
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