Natural Frequency Sensitivity Analysis of Fire-Fighting Jet System with Adaptive Gun Head
| Autor: | Yong Zhu, Lijie Zhang, Xuan Zhu, Chu Wang, Xiaoming Yuan |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
020209 energy
Acoustics Nozzle Firefighting Bioengineering 02 engineering and technology lcsh:Chemical technology law.invention jet system lcsh:Chemistry 0203 mechanical engineering sensitivity analysis law Normal mode 0202 electrical engineering electronic engineering information engineering Chemical Engineering (miscellaneous) lcsh:TP1-1185 adaptive gun head natural frequency Physics Process Chemistry and Technology Natural frequency Robot end effector flow control Flow control (fluid) 020303 mechanical engineering & transports Modal lcsh:QD1-999 mode shape |
| Zdroj: | Processes Volume 7 Issue 11 Processes, Vol 7, Iss 11, p 808 (2019) |
| ISSN: | 2227-9717 |
| DOI: | 10.3390/pr7110808 |
| Popis: | The gun head is the end effector of the fire-fighting jet system. Compared with a traditional fixed gun head, an adaptive gun head has the advantages of having an adjustable nozzle opening, a wide applicable flow range, and a high fire-extinguishing efficiency. Thus, the adaptive gun head can extinguish large fires quickly and efficiently. The fire-fighting jet system with an adaptive gun head has fluid-structure interaction and discrete-continuous coupling characteristics, and the influence of key design parameters on its natural frequencies needs to be determined by a sensitivity analysis. In this paper, the dynamic model and equations of the jet system were established based on the lumped parameter method, and the sensitivity calculation formulas of the natural frequency of the jet system to typical design parameters were derived. Natural frequencies and mode shapes of the jet system were determined based on a mode analysis. The variation law of the sensitivity of the natural frequency of the jet system to typical design parameters was revealed by the sensitivity analysis. The results show that the fluid mass inside the spray core within a certain initial gas content is the most important factor affecting the natural frequency of the jet system. There was only a 0.51% error between the value of the first-order natural frequency of the jet system determined by the modal experiment and the theoretical one, showing that good agreement with the first-order natural frequency of the jet system was found. This paper provides a theoretical basis for the dynamic optimization design of the adaptive gun head of the fire water monitor. |
| Databáze: | OpenAIRE |
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