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The perpendicularity of three-axis turntable directly affect the turntable's work precision, and orthogonal perpendicularity error of the three-axis turntable is mainly controlled by measuring length, dial gauge, precision and azimuth axis deviation comprehensively. Form an engineering reality, with dial gauge and three-dimension entity check stick, measurement method of orthogonal three intersecting...
The fault diagnosis for the overbalanced movement (dyspneaing vibration) phenomena of launching tower's pendulum system is researched. Firstly, an equivalent dynamic model is developed. Quasi-static method is used in the dynamic analysis of the model. The dynamic characteristic is researched based on the dynamic equation coming out of the dynamic analysis. Considering the dynamic characteristic, the...
To solve the issue of unbalanced system voltage and over current, a scheme based on decoupled current control and zero-sequence injection is put forward. Since STATCOM have to deal with the asymmetrical problem caused by power system fault, the balancing between three clusters becomes meaningful. To verify the strategy, a MATLAB/Simulink is used to build a simulation. And decoupled current control...
Trace elements are considered to be essential for anaerobic process. Laboratory-scale batch studies were undertaken to evaluate the effect of Fe2+on the biogas production from chicken manure at mesophilic condition (37 ±1°C). The biogas production increased by 26.6% within 11 days when Fe2+ concentration was 25 mg/L with VS concentration of 50g/L. With the increase of Fe2+ concentration, the biogas...
A detailed mathematical model of doubly-fed induction generator (DFIG) is derived according to generator convention. A novel S-Function is proposed to describe the mathematical model of DFIG. The simulation subsystems of no-load operation and generator operation are developed based on state equations. The control of the rotor current inner loop and the rotating speed outer loop are designed based...
The paper firstly calculates the optimal location of external torpedoes. And then the dynamics model of the UUV hanging torpedoes externally is established. Also, the force and moment the torpedoes exerted on the unmanned underwater vehicle are analyzed. Based on the model, the corresponding maneuverability simulation program is derived using SIMULINK. The results show the variation of the maneuverability...
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