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The non-laminar electron beams having an originally Gaussian current distribution is measured at IECAS, and the electron trajectories without and with RF signal are calculated using BWI code in the presence uniform magnetic and PPM focusing.
In this paper, the design of slow wave structures for an X-band broadband TWT with suppression of backward-wave using the helix pitch step method is present. An optimized design of a high-power X-band broadband TWT with improved BWO suppression and forward-wave saturated output power is presented.
Heat radiator for space traveling wave tube has been analyzed using ANSYS, and has been produced. The heat vacuum test shows that the experiment data agrees well with the simulated one.
This paper reports the design, simulation work and test results of a 150W Ku-band continuous wave space Traveling Wave Tube (TWT), which is fulfilled at the Institute of Electronics, Chinese Academy of Sciences. The double-anode gun, helix pitch-tapering slow wave structure, non-axisymmetric four-stage depressed collector and radiation-cooled radiator are used in this TWT. The test results indicate...
The study on the calibration method of FBG sensor used to measure strain of asphalt mixture is the precondition of FBG sensor application in asphalt pavement information monitoring. In this paper, monitoring results of indoor small size test process tested by traditional resistance strain gauge and FBG sensor are compared and analysed to complete FBG sensor calibration. The preparation process of...
Strengthening the competition ability is an urgent mission for China's air transport industry to survive in the market. In order to find the way of improving the industry competition ability, influencing factors of air transport industry competition ability were analyzed. The connotation of air transport product was defined, and its characteristics and competitive performance level were dissected,...
Aimed at the characteristics of strong nonlinearity, uncertainty, time-variance and, strong coupling etc for AC electric arc furnace (EAF), and the traditional PID can not achieve desired control effect. The paper proposes a PID control algorithm based on optimized BP neural network using genetic algorithm, which is applied in electrode regulator systems of electric arc furnace to design the optimized...
A constant-diameter cam gets its name because the centers of the rollers are a constant distance apart. This paper presents an Accuracy analysis and optimization design method for constant-diameter cam mechanism. Factors affecting the accuracy of cam are studied in the paper. The influences of the roller radial runout, cam machining error and the base circle radius on accuracy are analyzed. Then,...
An optical supporting structure is studied to improve its structure stiffness and reduce the rotate error to meet the requirement of aviation remote sensor. A formula to calculate fundamental frequency is proposed using Rayleigh-Ritz method, and a method of is analyzed. By means of OPTISTRUCT software, the maximum fundamental frequency is converted to object function, the deformation under the gravity...
In order to evaluate airlines' customer satisfaction properly, the fundamental of structural equation model (SEM) was introduced, the airline's customer satisfaction evaluation model was developed according to airline's operation characteristic, and Air China was taken as an example to validate the theoretic model. SEM given in this paper was proven to be suitable for comprehensively evaluating the...
A speech transmission system was designed to conquer the restriction of analog communication system in coal mine. After compressed by multi-band excitation, the voice data was transmitted on CAN (controller area network)-bus to achieve long transmission distance at low speed. Compared simulation data and experimental data, it got the result that CAN-bus can bare the speech data after MBE coding compression,...
This paper shows how to reduce the bullwhip effect by the linear control theory. First of all, the methodology of the supply chain and the bullwhip effect is given based on control engineering insights. By describing the sequence of events and analyzing of the transfer functions, a new stock policy which bases orders on the inventory position at an installation is given. The results are proved by...
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