The LEACH is a popular protocol used in wireless sensor network analysis and simulation.This paper analyses the advantages disadvantages of then puts forward clustering routing for energy balance based on simulated annealing genetic algorithm.When nodes are deployed randomly area, Firstly, we cluster by algorithm calculate center each cluster.If node higher than average cluster, it will become candidate head; at last head becomes according to distance from cluster.Simulations show that new...

Airworthiness requirements for APU in-fight start function in CCAR 25 is analyzed.Based on the guidance advisory circular, a executable method compliance verification proposed and applied domestic civil aircraft. Binomial distribution introduced reliability tests to determine total number of test points need do.As result, first time, in-flight cold soak was carried out aircraft, time as long 4 hours. And, minimum 95% verified aircraft using established.

The inlet noise of auxiliary power unit (APU) for the civil aircraft, as a major source apron noise, has been widely discussed and concerned. Given its high-frequency dominant characteristics, this paper distinguishes itself from traditional uniform honeycomb core depth liners by optimizing four types acoustic liners: single-degree-of-freedom (SDOF) liners, double-degree-of-freedom (DDOF) parallel SDOF DDOF within their respective design spaces. goal is to achieve broader absorption...

In cases the total demand for aircraft exceeds APU capability, it may cause EGT over-temperature or power section compressor surge, which damage APU. Currently, most APUs of commercial are set with control logic to prevent over-temperature, but there is no similar method surge. this paper, an anti-surge based on generator priority was established. ECU monitors fuel flow and compare limit in real time determine whether operating point beyond surge line. If so, load prioritized, command IGV...

The precision of frequency tracking method and phase difference calculation affects the measurement Coriolis Mass Flowmeter directly. To improve accuracy mass flowrate, a novel signal processing for is proposed this time varying signal, which comprised modified adaptive lattice notch filter revised sliding recursive discrete-time Fourier transform algorithm. cannot only track change continuously, but also ensure when measuring difference. computational load small with higher accuracy....

We first analyze the effect of network-induced delay on stability networked control systems (NCSs). Then, aiming at stochastic characteristics time delay, we introduce a new Smith predictor to remove exponential function with in closed-loop characteristic equation NCS. Furthermore, combine fuzzy PID algorithm immune and present self-adaptive compensate influence model deviation controlled object. At last, kind based is presented apply The simulation research DC motor given show effectiveness...

Triblock copolymer P(THF-<italic>co</italic>-PO)-<italic>b</italic>-PB-<italic>b</italic>-P(THF-<italic>co</italic>-PO) with gradient copolyether segments was synthesized, and its elastomer exhibited excellent dynamic mechanical properties.

Macro evaluation indexes (penetration, ductility and softening point) are considered as an important basis for rational of asphalt service performance, but their micromechanisms have not been further studied. Thus, in order to establish the macro asphalt, grey relational analysis molecular dynamics simulation were applied study. Based on measured data, variation components analysed. Combined with characteristics (bond energy non-bond energy) 12-component molecules, relationship among...

The engine bleed air system (BAS) is one of the important systems for civil aircraft, and its operating state directly affects operational safety aircraft. effective risk warning BAS critical to improving aircraft operators' profits; thus, a multivariate estimation technique with dynamic process memory matrix proposed warn failure system. First, obtain optimal value observation vector, formed by searching first vectors that are similar each input vector from healthy data pool can cover...

Abstract This paper sets forth a method of compliance with the requirements CCAR 25.901(d) and 25.903(d)(1) [1] Civil Aviation Administration China(CAAC) pertaining to design precautions taken minimize hazards an airplane in event uncontained engine or auxiliary power unit (APU) rotor failures. A general methodology including safety risk analysis deal this issue is proposed. The principles determine factors are also discussed order provide practical decide key factor for use.

A novel signal processing method for Coriolis mass flowmeter (CMF) is proposed based on time-varying model. First, an adaptive lattice notch filter with the capability of tracking frequency variation applied to and calculate frequency. Then recursive DTFT algorithm negative contribution, which can largely shorten convergence stage, introduced into calculation real-time phase difference between two enhanced signals. Sampled data are intercepted by overlap windows a small length. With...

With the popularity and increasing of web services, how to composite automatically services by request user has become a challenge. Presents way dynamic composition based on domain ontology. This generates graphics that is ontology using semantic technology, according can support automatic discovery, dispatch, compositions services. considers synthetically support, characteristic In last, validates availability this way.

Low-rate Denial of Service (LDoS) attack and TCP flows are simulated in the time frequency domain for purpose analyzing their signatures extracting period T duration L LDoS attack, which two correlative parameters used proposed detecting approach. In correlation operation, reference signal is traffic built based on extracted L. The incoming hybrid (TCP plus Real attacks). A detect threshold established to be compared with results operation. If value exceeds threshold, determined. method has...

Aimed at the deficiency of existing PID controller for quad rotor UAV, a single neuron with gravity compensation is presented. After using feed forward control to compensate gravity, position loop adopts ensure accuracy, while attitude increase adaptive ability. Then, by Matlab/simulink simulation software, UAV carried out, and result shows, compared traditional double closed controller, algorithm based on Single Neuron can effectively improve robustness adaptability system.

Stabilization and autoignition mechanisms of lifted flames have been widely investigated to improve combustion efficiency safety equipment. This paper focuses on liftoff behavior characteristic methane propane under various coflow conditions in a burner. Unlike the case free jet flame ambient air, different tendencies height changes with velocity for both vitiated illustrate transition from conventional Moderate & Intense Low Oxygen Dilution (MILD) combustion. Flame temperature difference...

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In this paper, a theoretical model to analyze the mode coupling induced by heat, when fiber amplifier works at high power configuration, is proposed. The mainly takes into consideration field change due thermally refractive index and between modes. A method predict largest average output of also proposed according theory. large pitch with core diameter 190 μm an available pulse energy 100 mJ predicted be 540 W, which highest in fibers.