基于气液耦合原理的飞机液压系统流体脉动消振器

doi:10.7527/S1000-6893.2024.30180

Abstract

Abstract:

As high demands of reliability and safety for aircraft hydraulic systems， the flow ripples caused by the aircraft hydraulic piston pump may lead to pipe vibration and components’ damage， which becomes the limitation of the high system reliability and long system lifetime. The attenuator utilized in the aircraft hydraulic system may demand wide frequency range， wide temperature range， effective attenuation effect and compact design， which are very challenging for the traditional attenuators. This paper presents the gas-liquid coupling principles theoretically， and proposes a novel fluid pulsation attenuator for wide range of frequencies and temperature. The mathematic model for the attenuator is established， and the design principles of the frequency range and temperature range are studied， and the positions of its installation are also studied. The prototype of attenuator is developed， and experiments are carried out on the aircraft hydraulic pump. The experimental results show that the attenuator has effective attenuation effect at frequency range from 394.2 Hz to 1 540 Hz， and the largest insertion loss value could reach up to 29.6 dB. At ambient temperature， the reduction rate could reach up to 75.7% in the time domain and 89.3% in the frequency domain； at high temperature， the reduction rate could reach up to 68.0% in time domain and 88.0% in frequency domain. The principles and model proposed in this work are proven to be effective and accurate， and the attenuation effects are validated in wide range of frequencies and temperature.

Key words: aircraft hydraulic system, pressure pulsation, flow ripples reduction, gas-liquid coupling principle, pulsation attenuation experiment

CLC Number:

V245.1

Yuanzhi XU, Renyuan WANG, Zongxia JIAO. Attenuator for fluid pulsation in aircraft hydraulic systems based on gas⁃liquid coupling principle[J]. Acta Aeronautica et Astronautica Sinica, 2024, 45(15): 630180-630180.

Figures/Tables 27

Fig.1

Fig.2

Fig.3

Table 1

Key parameters of attenuator

参数	数值	参数	数值
$P a$ /Pa	2.8×10⁷	$A b$ /m²	1.8×10^-3
$V a$ /m³	1.46×10^-5	$l e$ /m	2.5×10^-2
$ρ b$ /（kg·m^-3）	1.1×10³	$A e$ /m²	2×10^-4
$e b$ /m	2×10^-3	$r e$ /m	8×10^-3

Table 1

Fig.4

Fig.5

Fig.6

Fig.7

Table 2

Fig.8

Fig.9

Fig.10

Fig.11

Fig.12

Fig.13

Fig.14

Fig.15

Table 3

Attenuation effect at typical rotate speed at ambient temperature

转速/（r·min^-1）	压力脉动峰峰值 $P k$ /MPa		消振比 $R T a$ /%
转速/（r·min^-1）	无消振器	有消振器	消振比 $R T a$ /%
1 050	1.59	0.54	66.0
2 100	2.04	0.86	57.8
3 150	2.92	1.38	52.7
3 300	3.85	2.00	48.1
3 450	4.20	1.80	57.1
3 600	4.00	1.72	57.5
3 750	4.19	1.20	71.4
3 900	4.45	1.44	67.6
4 050	4.96	1.80	63.7
4 200	4.45	1.08	75.7

Table 3

Fig.16

Table 4

Attenuation effect at typical frequency at ambient temperature

倍频	频率/Hz	压力脉动幅值 $P k$ /MPa		消振比 $R T a$ /%
倍频	频率/Hz	无消振器	有消振器	消振比 $R T a$ /%
基频	192.5	0.10	0.08	20.0
	385.0	0.61	0.19	68.9
	577.5	0.90	0.15	83.3
	605.0	0.75	0.12	84.0
	632.5	1.09	0.19	82.6
	660.0	1.02	0.18	82.4
	687.5	0.97	0.14	85.6
	715.0	1.10	0.19	82.7
	742.5	0.88	0.17	80.7
	770.0	1.12	0.12	89.3
二倍频	385.0	0.18	0.06	66.7
	770.0	0.14	0.02	85.7
	1 155.0	0.20	0.05	75.0
	1 210.0	0.62	0.43	30.6
	1 265.0	0.42	0.29	31.0
	1 320.0	0.22	0.12	45.5
	1 375.0	0.20	0.12	40.0
	1 430.0	0.45	0.14	68.9
	1 485.0	0.63	0.25	60.3
	1 540.0	0.39	0.07	82.1

Table 4

Fig.17

Fig.18

Fig.19

Table 5

Attenuation effect at typical rotate speed at high temperature

转速/（r·min^-1）	压力脉动峰峰值 $P k$ /MPa		消振比 $R T a$ /%
转速/（r·min^-1）	无消振器	有消振器	消振比 $R T a$ /%
1 050	1.50	0.89	40.7
2 100	2.78	0.93	66.5
3 150	4.24	2.02	52.4
3 300	4.90	1.61	67.3
3 450	4.01	1.59	60.0
3 600	4.20	1.60	61.9
3 750	4.80	1.90	60.4
3 900	5.20	1.80	65.4
4 050	4.90	1.70	65.3
4 200	6.47	2.07	68.0

Table 5

Fig.20

Table 6

Attenuation effect at typical frequency at high temperature

倍频	频率/Hz	压力脉动幅值 $P k$ /MPa		消振比 $R T a$ /%
倍频	频率/Hz	无消振器	有消振器	消振比 $R T a$ /%
基频	192.5	0.22	0.18	18.2
	385.0	0.31	0.11	64.5
	577.5	1.10	0.18	83.6
	605.0	1.20	0.22	81.7
	632.5	0.87	0.14	83.9
	660.0	1.01	0.12	88.0
	687.5	1.07	0.15	86.0
	715.0	1.10	0.14	87.3
	742.5	1.02	0.13	87.0
	770.0	0.95	0.16	83.2
二倍频	385.0	0.23	0.03	87.0
	770.0	0.74	0.14	81.1
	1 155.0	0.58	0.35	39.7
	1 210.0	0.44	0.29	34.1
	1 265.0	0.18	0.13	27.8
	1 320.0	0.23	0.14	39.1
	1 375.0	0.75	0.24	68.0
	1 430.0	0.44	0.2	54.5
	1 485.0	0.17	0.11	35.3
	1 540.0	1.04	0.26	75.0

Table 6

Fig.21

References 23

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消振元件	质量/kg	反共振峰频率/Hz
消振器	0.4	786
0.3 L缓冲瓶	1.4	609
1 L蓄能器	5.7	67

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Attenuator for fluid pulsation in aircraft hydraulic systems based on gas⁃liquid coupling principle

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