Applied Mechanics and Materials Vols. 713-715

Abstract: In this paper stochastic resonance was studied in radar driven by noise frequency modulation signal. According to the intrinsic relations between the stochastic differential and the radar jamming signal processing, the stochastic calculus was used in the radar jamming signal processing in this paper. The noise frequency modulation signal was particularly analyzed. The Fokker-Planck equation of noise frequency modulation was presented and the Motion-Group Fourier Transform was used by converting the partial differential equation into the variable coefficient homogenous linear differential equations. Then the solutions were given.

Abstract: In chaotic speech signal encryption, masking is the most direct and convenient method. But the chaotic signals usually have a narrow spectral range in low frequency region. In order to overcome the disadvantage that the higher frequency signals can not be completely covered up, UPT is used to conduct a nonlinear transformation to chaotic signal. After UPT, chaotic types are increased, chaotic characteristics are improved and spectral range is widened. Simulation experiments are done respectively from frequency domain and spectrogram perspectives. The chaos before and after transformation are used to mask speech signal. Decoding experiment is taken on the speech encrypted by transformed chaos. Experiment results show that, after UPT, the encryption effect of speech signal is improved obviously. This method has a high security and a strong anti-attack ability.

Abstract: Existed in the work of wireless positioning error, the need to suppress NLOS (Non line of sight) transmission problem of positioning the bad influence of the NLOS system model is put forward and the novel geometric positioning model, the introduction of appropriate NLOS channels model to suppress NLOS error, and make full use of the propagation characteristics of derived meet MS (Mobile Station) coordinates equation, with two NLOS paths can only calculate the position of MS, and using only a single base Station can complete the MS positioning, overcome the base Station number too little to pinpoint the flaws of the MS. This paper also gives a method of least squares and maximum likelihood algorithm, using the NLOS paths to improve the positioning accuracy. So as to realize the movement of the MS in NLOS environment position tracking. Through the theoretical analysis and computer simulation analysis, the results show that the positioning method in NLOS environment on the effectiveness and accuracy of the MS positioning.

Abstract: In this paper, the advantage of hybrid electric vehicle (HEV) equipped with dual clutch transmission (DCT) was presented. Five HEV simulation models equipped with DCT were built on the basis of AVL CRUISE software. According to different power-train configurations, different control strategies were built by MATLAB/SIMULINK. The advantage and disadvantage of each power-train configurations was analyzed through simulation. The results supplied the foundation for the next step vehicle development.

Abstract: In this paper, A new type of power-split HEV system based on Ravigneaux Planetary Mechanism is introduced. Using AVL Cruise software established the hybrid passenger car simulation model. The energy management system control strategy based rules is also studied. The effectiveness of the control strategy for the vehicle is proved by UDDC driving cycle. According to the results, fuel consumption saving of five percent than that of the prototype.

Abstract: As the national economy sprawls and urbanization progresses, riding on vehicles has become a dominant way of travel in recent years. Different from developed economies where people normally travel in their private cars, public transit tools are still the first choice for the Chinese population. the enormous quantity of automobiles in service will mean huge pressure on energy and environment. Traditional petroleum-based automobile industry will be faced with great challenge. China will be facing even fiercer challenge in its petroleum safety and transportation energy. Energy consumption is becoming a bottleneck for the nation’s transportation business. To improve the urban air environment and quality, Pure electric buses has a wide application value,one of the best solutions could be battery electric buses.

Abstract: In this paper, we studied the positive integer solutions of a typical Diophantine equation starting from two basic equations including a Diophantine equation and a Pell equation, and we will prove all the positive integer solutions of the typical Diophantine equation.

Abstract: Due to the impact of capacity change on traffic flow in single-aerodrome terminal airspace, a strategy to balance traffic flow and capacity in single-aerodrome terminal airspace is studied by introducing the idea of collaborative decision making and law of economics. First, considering factors such as airline’s gross income, operation cost and delay cost, an optimization model based on traffic flow to maximize total airline’s net income is established, and constraints including capacity of single-aerodrome terminal airspace are imposed as well. Then, a genetic algorithm to optimize the above model is proposed and realized. Traffic flow and capacity in single-aerodrome terminal airspace can be balanced by using the proposed strategy, while the total airline’s net income is increased at the same time.

Abstract: A novel composite framework of Cuckoo Search (CS) and Particle Swarm Optimization (PSO) algorithm called CS-PSO is proposed in this paper. In CS-PSO, initialization is substituted by chaotic system, and then Cuckoo shares optimums in the global best solutions pool with particles in PSO to improve parallel cooperation and social interaction. Furthermore, Cloud Model, famous for its outstanding characteristics of the process of transforming qualitative concepts to a set of quantitative numerical values, is adopted to exploit the surrounding of the local solutions obtained from the global best solution pool. Benchmark test results show that, CS-PSO can converge to the global optimum solution rapidly and accurately, compared with other algorithms, especially in high dimensional problems.

Abstract: In this paper, the development of Joint Direct Attack Munition (JDAM) and the importance of firepower assignment are introduced, as well as the analysis on the bombing ways of JDAM. Consider the target threat level and comprehensive favorability about the targets distribution problem when taking barrage firing method to JDAM. It gets the optimal distribution of shooting based on example and data.