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Proton Exchange Membrane Fuel cell has many perfect characters and becomes one of the most important research subjects among domestic and international fuel cell fields. Heat transfer management is one of the key technologies for PEM fuel cell. This paper built a temperature model of PEM fuel cell based on fuzzy technology, which divided the fuzzy space evenly by established rules, got the number...
With the widespread concern for the SoS(System of Systems), the attention that SoS task process received is continuously increasing. Due to the complexity of SoS and the system SoS task process, it is difficult to describe SoS and SoS task process. Trying to draw on the theory of FEMA and the IDEF3, this article attempts to model a SoS task process and calculate the reliability of it. First, a SoS...
This paper introduces the Modelica Buildings library which has been developed for the advanced simulation of building energy and control systems. Modelica offers benefits compared to conventional approaches for integrating models from different domains, and for simulating systems with largely varying time responses such as building energy systems and control algorithms. This paper also introduces...
The ultra-low orbit satellites generally orbit at an altitude about 200km, and have better performance of observing the Earth and receiving information while using the same observation instrument, thus have good economic benefits and broad application prospects. However, the aerodynamic forces and moments interference to the ultra-low-orbit satellites are dozens of orders of magnitude higher than...
To process the uncertainty of decision-making environment and the real-time during the tactical decision of UAV medium-range air combat, a hybrid tactical decision-making method based on rule sets and Fuzzy Bayesian network (FBN) was proposed. By studying the process of UAV air combat, the main factors that affect the tactical decision were analyzed. A corresponding FBN and expert system were built...
For the life of the aircraft air refrigerator trend analysis problems, this paper proposed the research method that based on a combination of SVM and neighborhood rough set attribute reduction. First, to find out the core factors which are the most significant ones affecting the life of the aircraft air refrigerator, the original information of the data is mined by the attribute reduction algorithm...
The continuous process of ILS (Integrated Logistic Support) tasks is attributed to the stable state of ILS process system composed of ILS activities. In terms of individual activity, the variation of the entire process state was random, but from an overall perspective, it followed certain statistical regularity. According to the above characteristics of ILS process, the author was able to discover...
A novel air-conditioning fuzzy controller based-on semi-tensor product (STP) is applied into a thermal comfort control system, according to difficulty for air conditioning to control indoor thermal comfort. Through STP of matrices, the measured sampling data of indoor temperature and humidity are used to obtain a matrix-based fuzzy relation structure model. Instead of the complex process of logical...
This paper focuses on the adaptive tracking problem for air-breathing hypersonic vehicles (AHVs) subject to aerodynamic uncertainties and unknown disturbances caused by modeling errors. Motivated by the nonlinear disturbance observer-based control approach (NDOBC), the parameter uncertainties are merged into the disturbances. A control law based on the tracking control method originally proposed by...
This paper reviews research results on flight control of air-breathing hypersonic cruise vehicles. The results are classified according to different flight control strategies. Their main ideas and drawbacks are analyzed. Finally, some suggestions on future work based on the analysis are pointed out.
As a new technology of renewable energy, ground-coupled heat pump system has been rising in our country in recently years. However because of the nonlinear and high degree of coupling, it is not clear to find out the relationship between control variables and total energy consumption of the system. This paper proposes a modeling way for ground-coupled heat pump system that uses artificial neural network,...
In the process of pursuing the target, we not only expect the least miss distance, but also a better attitude when the missiles impact the target. The better attitude can effect the power of missiles, and what's more, it can avoid the unnecessary disturbance. For instance, a missile always fails to lock the target owing to the too complicated background while attacking a low-attitude target. The strong...
In this paper, the design of simulation software and control system for unmanned aerial vehicle (UAV) during aerial refueling is proposed, in which the simulation software is constructed under Microsoft Visual Studio 2010, and control system is designed based on the linear control theory and assumption of relatively small perturbations during the docking. The proposed model has the merits of explicitly...
The fuel system is one of the most important component parts of aircraft and plays a vital role for the smooth implementation of the safety of aircraft mission. The platform uses computer software and hardware simulation technology (Making combination of software and hardware simulation which not only covers troubleshooting content requirements but also avoids assembling Air Material).The working...
Military and civil aviation are requiring higher performance for the aircrafts in recent years. The Morphing techniques can effectively improve aircraft's performance to meet the customer's multi-role requirement for the aircraft. The physical model of a variable-span and variable-sweep morphing aircraft is simplified. Based on the Kane's method, the morphing motions are assumed to be controllable...
With the fast development of the aerospace, the design and manufacture of landing gear are becoming hot topics nowadays. The development and application of the Virtual Prototyping Technology (VPT) have opened up a new field of the design and manufacture of the aircraft, the design, manufacture and test of the aircraft have made qualitative leaps in concept and method. Modeling and Simulation Techniques...
This paper presents a data-driven adaptive soft sensor approach to investigate the performance and optimal operation of cooling tower for energy conservation. To achieve this aim, first, the cooling tower process is characterized by an adaptive soft sensor with nonnegative garrote (NNG) variable selection procedure. Then, based on the statistics result of NNG variable selection, the effect of environment...
The changes of flow rate and heating value of blast furnace gas (BFG) make the boiler operation more like art than science. In this paper, statistics analysis methods are utilized to justify the significance of the derived variables for the thermal efficiency modeling. By employing nonnegative garrote (NNG) variable selection and auto-regression integrated moving average (ARIMA) correction, an adaptive...
Chillers operation energy efficiency is the main factors affecting the efficiency of air conditioning systems. A chillers operation energy efficiency model and its method for a real chiller plant were proposed in this paper, whose parameters were optimized by GA optimization algorithm. Moreover, as R_RMSE (Relative Root Mean Square Error) was adopted as the evaluation of the prediction accuracy, the...
Currently, it has a lot of uncertainty and is difficult to use expert knowledge to integrated support analysis process of military aircraft. This paper took the power system of a military aircraft as example, and created a integrated support analysis model based on fuzzy theory. Firstly, the author used the analytical hierarchy process (AHP) to determine the weight of three different factors which...
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