Transient Dynamic Response Analysis on Large Turbine Generator Set
In order to study the unit's movement law,a transient dynamic response model of large hydroelectric machines is established.The model couples the whole unit such as main shaft,generator rotor,turbine runner and various bearing supporting,and involves consistent quality of the unit shaft,gyroscopic inertia and angular inertia.The finite element method and direct numerical integration method are used in the calculation.Through an engineering example,the numerical simulations of time-course response and axes contrail are respectively carried out when the units are acted under transient initial displacements and transient imbalance loads.The calculated results are discussed and analyzed.By means of comparison between calculated and measured data,their results are close.
Natural resource preservation has recently become a significant concern,and has motivated research and development efforts to assist in both conservation and management.Electricity usage in residential and commercial buildings represents a significant fraction of total energy expenditure.A key prerequisite for energy conservation is knowing when and where energy is being spent.However,in the current energy reporting devices only provide coarse grained information.This paper presents a fine grained power auditing system based on the sensor networks.This system can provide detailed information about the total energy consumption in any period for each appliance and thus will become an efficient tool for future real-time pricing.At the same,some behavior model can be drawn from the collected data based on the proposed system.