Allocation and control of FACTS devices for steady-state stability enhancement of large-scale power system
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FACTS devices are recognized as a new damping resource for poorly damped, low frequency electromechanical oscillation, which usually takes place in a power system operating with long transmission lines under heavily loaded condition. Nevertheless, the damping effect of FACTS devices is known to be strongly influenced by their location and control system. This paper is motivated to cope with these two challenges. By ways of modal analysis, a location index for determining FACTS optimal location is proposed which is suitable and feasible for large scale power systems. A method for tuning parameters in the FACTS control system with a given configuration is presented simultaneously. Numerical results for a 7-machine power system has shown the validity and efficiency of the proposed method.Keywords:
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This paper integrates experiment modal analysis and the analytical modal analysis to study on the vibration phenomena occurring occasionally at the different components of a precise horizontal machining centre. The paper is focused on extracting the mode shape of the major components of the machine in order to ensure resonance phenomena as a cause of vibration. At first the main natural frequencies with the corresponding modes of vibration of the machine structure are obtained by the experiment modal analysis. Then the dynamic behavior of the machine components is simulated using a finite element simulation model. The comparison of the results based on finite element calculation with their experimental counterparts shows the reasonableness. The model is evaluated and corrected with experimental results by modal testing of the machine components.
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Experimental modal analysis has developed into a major technology for the study of structural dynamics. Complex structural dynamic responses can be represented using decoupled vibration modes, each of which is a single-degree-of-freedom (DOF) system governed by its natural frequency and mode shape. The study of the dynamic characteristics represented by modal properties, including the natural frequency and mode shape, is referred to as modal analysis. Theoretical modal analysis solves the differential equations of the motion (i.e. the analytical model) of a structure to compute the structure's modal properties. Experimental modal analysis, on the other hand, primarily concerns the determination...
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In this paper, a finite element model of an automotive air cleaner is established. Through the free modal analysis of this FEA model, combined with Modal Testing which modified the FEA model, different order modal frequency and modal characteristics are acquired, which supply the reference standard for dynamic design. According to the analysis, the local unreasonable structure will be optimized.
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Under the conditions of the rotatingwave,slowly varying envelope approximations.It was found that Variation of the driving field Rabi frequency doesn′t vary the oscillation (or nonoscillation) characteristic of the atomic response time evolution and the time needed for reaching to steady state,but will vary size of the oscillation frequency and steady value;increase of incoherent pumping rate doesn′t vary the oscillation frequency and steady value,but will make oscillation times decreasing,oscillation amplitude reducing,time needed for reaching to steady value shorting,however,the steady value of each atomic response doesn′t increase or decrease monotonously with incoherent pumping rate increasing;variation of initial condition of the system doesn′t vary the law of time evolution of atomic response and the steady value of each atomic response.
Oscillation (cell signaling)
Envelope (radar)
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Nature frequency is one of the most important dynamic characteristics of motorcycle structure. Detailed information has been acquired by the author using experimental modal analysis and mathematical modal analysis. According to the real situation, a simplified model was developed and constrains were loaded. With the aided of computer, a group of experimental nature frequencies and modal shapes were acquired. Meanwhile, a mathematical calculating was carried on by the ANSYS 9.0. Comparing the two groups of results indicates that: the simplified model of the motorcycle structure is reasonable and constrains applied to it are effective.
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One approach using modal analysis and harmonic response to analyze the characteristics of machine tools is proposed in this paper. Dynamic theory and modeling method of MDOF system are introduced. Modal experiment is carried out to obtain modal frequency, damping and shape. Based on these parameters, a virtual dynamic model is established to match the actual one. Meanwhile, simulation and modal analysis have been done using FEA to obtain the accurate dynamic characteristics. Moreover, studies of harmonic response are carried out to get the explicit characteristics of each part in the model. Additionally, there are some suggestions regarding to improvement in the future.
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