The vibration of an elastic beam experiencing vortex-induced vibration is numerically analyzed employing a wake-oscillator model. The influence of the excited mode, the initial velocity, the shedding pulsation and the...The vibration of an elastic beam experiencing vortex-induced vibration is numerically analyzed employing a wake-oscillator model. The influence of the excited mode, the initial velocity, the shedding pulsation and the mass ratio on the energy transfer among modes and the vibration amplitude is determined. Multiple frequencies are detected, and the power spectral density of the beam tip time series is used to calculate the dominant frequency.展开更多
The invention of this study harvests a portion of hydropower in the fire hose to drive a micro turbine generator and the electric power generated is used to light the LED （light-emitting diode） attached on the fire ...The invention of this study harvests a portion of hydropower in the fire hose to drive a micro turbine generator and the electric power generated is used to light the LED （light-emitting diode） attached on the fire nozzle for the illumination of dark scene （it is called nozzle light in this study）. The simulation and experiment are done to match the design of nozzle light. Nozzle light provides firefighters a synergistic function to spray the water and illuminate the fire field at the same time without requiring any extra hand to handle the light. It indeed increases both the efficiency of putting off a fire and the safety of firefighters. The most innovative benefit is that neither heavy battery nor utility wires are needed to get the lighting.展开更多
文摘The vibration of an elastic beam experiencing vortex-induced vibration is numerically analyzed employing a wake-oscillator model. The influence of the excited mode, the initial velocity, the shedding pulsation and the mass ratio on the energy transfer among modes and the vibration amplitude is determined. Multiple frequencies are detected, and the power spectral density of the beam tip time series is used to calculate the dominant frequency.
文摘The invention of this study harvests a portion of hydropower in the fire hose to drive a micro turbine generator and the electric power generated is used to light the LED （light-emitting diode） attached on the fire nozzle for the illumination of dark scene （it is called nozzle light in this study）. The simulation and experiment are done to match the design of nozzle light. Nozzle light provides firefighters a synergistic function to spray the water and illuminate the fire field at the same time without requiring any extra hand to handle the light. It indeed increases both the efficiency of putting off a fire and the safety of firefighters. The most innovative benefit is that neither heavy battery nor utility wires are needed to get the lighting.
