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Article

Natural Frequency Sensitivity Analysis of Fire-Fighting Jet System with Adaptive Gun Head

by 1,2, 1,2, 1,2,*, 1,2 and 3,*
1
Hebei Key Laboratory of Heavy Machinery Fluid Power Transmission and Control, Yanshan University, Hebei, Qinhuangdao 066004, China
2
State Key Laboratory of Fluid Power & Mechatronic Systems, Zhejiang University, Zhejiang, Hangzhou 310027, China
3
National Research Center of Pumps, Jiangsu University, Zhenjiang 212013, China
*
Authors to whom correspondence should be addressed.
Processes 2019, 7(11), 808; https://doi.org/10.3390/pr7110808
Received: 14 October 2019 / Revised: 25 October 2019 / Accepted: 28 October 2019 / Published: 4 November 2019
(This article belongs to the Special Issue Smart Flow Control Processes in Micro Scale)
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. View Full-Text
Keywords: flow control; adaptive gun head; jet system; natural frequency; mode shape; sensitivity analysis flow control; adaptive gun head; jet system; natural frequency; mode shape; sensitivity analysis
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MDPI and ACS Style

Yuan, X.; Zhu, X.; Wang, C.; Zhang, L.; Zhu, Y. Natural Frequency Sensitivity Analysis of Fire-Fighting Jet System with Adaptive Gun Head. Processes 2019, 7, 808. https://doi.org/10.3390/pr7110808

AMA Style

Yuan X, Zhu X, Wang C, Zhang L, Zhu Y. Natural Frequency Sensitivity Analysis of Fire-Fighting Jet System with Adaptive Gun Head. Processes. 2019; 7(11):808. https://doi.org/10.3390/pr7110808

Chicago/Turabian Style

Yuan, Xiaoming, Xuan Zhu, Chu Wang, Lijie Zhang, and Yong Zhu. 2019. "Natural Frequency Sensitivity Analysis of Fire-Fighting Jet System with Adaptive Gun Head" Processes 7, no. 11: 808. https://doi.org/10.3390/pr7110808

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