Research on Parameter Vibration of Adaptive Head Jet System of Fire Water Monitor Considering Pressure Pulsation

doi:10.3901/JME.2020.20.246

Abstract

Abstract: The adaptive head of fire water monitor can automatically adjust the muzzle opening according to the change of fluid pressure and flow rate. Therefore, the jet performance of fire water monitor can be significantly improved. Considering the pressure pulsation of the fluid in the adaptive head jet system and combining the relationship between the fluid bulk modulus and the fluid stiffness, the parameter vibration model of adaptive head jet system based on the time-varying fluid stiffness is founded. By the multiscale method, the resonance response formulae of jet system are deduced when the excitation frequency is closed to natural frequencies and the combination frequency of the natural frequency and the pulsation frequency of jet system, and the main resonances and combined resonances of the jet system are analyzed. The results show that when the main resonance response of the jet system occurs, the dominant frequency in resonance responses is the excitation frequency, and the resonance amplitudes of the jet system is largest when it is close to the first-order natural frequency. When the combined resonance response of the jet system occurs, the influence of the combined frequency between the excitation frequency and fluid stiffness fluctuation frequency on the system response is related to the fluid pulsation frequency. The main resonances and combined resonances will seriously deteriorate the dynamics behaviour of adaptive head jet system. This research can provide a theoretical basis for further exploration of the dynamic characteristics of the adaptive head jet system of fire water monitor and optimizing the design parameters under different working conditions.

Key words: fire water monitor, adaptive head, jet system, parameter vibration, pressure pulsation

CLC Number:

TG156

YUAN Xiaoming, WANG Chu, ZHAO Shiyi, ZHANG Lijie. Research on Parameter Vibration of Adaptive Head Jet System of Fire Water Monitor Considering Pressure Pulsation[J]. Journal of Mechanical Engineering, 2020, 56(20): 246-254.

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