Influence of Oil Characteristics on Flow Pulsation of Axial Piston Pump of Large Displacement Under Solid-Liquid-Temperature Coupling

doi:10.12141/j.issn.1000-565X.220651

Abstract

Abstract:

In the working process of large-scale construction machinery such as excavators and shield machines, due to the complex working conditions and changeable environment, the hydraulic system power component axial piston pump of large displacement has greater hydraulic impact than the conventional piston pump, and it causes greater flow pulsation and pressure pulsation. In order to reduce the flow and pressure pulsation of axial piston pump of large displacement under excavation, shield and other working conditions, reduce the impact damage of oil medium on downstream components, and provide theoretical guidance for selecting oil medium methods, this paper built a mathematical model of oil dynamic viscosity, density and bulk elastic modulus based on the influence of temperature field. On this basis, a mathematical model of piston pump with solid-liquid-temperature coupling was established. ADAMS and AMESim software were used to complete the joint simulation of 750 mL/r piston pump under the coupling of solid-liquid-temperature, and the variation law of flow pulsation and pressure pulsation of piston pump under different temperature was obtained. The influence of oil temperature on the pressure pulsation of the piston pump was investigated by the whole pump test, and the correctness of the solid-liquid-temperature coupling simulation model of the 750 mL/r piston pump was verified. According to the three characteristics of oil, the orthogonal test method and the single factor analysis method were used to consider their influence degree and influence law on the flow pulsation rate of the piston pump, respectively. The results show that the outlet flow pulsation and pressure pulsation of the piston pump increase with the increase of temperature. Under the set condition, the influence of oil bulk modulus on flow pulsation rate is 97.19%, the density is 2.03%, and the dynamic viscosity is 0.78%. In order to reduce the influence of oil characteristics on the pulsation rate of piston pump outlet, hydraulic oil with larger bulk modulus and smaller density should be selected.

Key words: axial piston pump, oil characteristics, flow pulsation, dynamics, temperature field

CLC Number:

TH322

XIA Yimin, LI Zhenghui, TAN Shunhui, et al.. Influence of Oil Characteristics on Flow Pulsation of Axial Piston Pump of Large Displacement Under Solid-Liquid-Temperature Coupling[J]. Journal of South China University of Technology(Natural Science Edition), 2023, 51(9): 44-55.

Figures/Tables 20

Fig.1

Fig.2

Fig.3

Table 1

Table 2

Fig.4

Fig.5

Fig.6

Fig.7

Fig.8

Table 3

Table 4

Orthogonal test results and analysis"

试验号	A	B	C	试验方案	脉动率/%
1	875	0.120	1 590	A1/B1/C1	27.69
2	875	0.039	1 440	A1/B2/C2	32.28
3	875	0.017	1 320	A1/B3/C3	36.16
4	875	0.009	1 210	A1/B4/C4	39.96
5	861	0.120	1 440	A2/B1/C2	32.20
6	861	0.039	1 590	A2/B2/C1	27.51
7	861	0.017	1 210	A2/B3/C4	39.92
8	861	0.009	1 320	A2/B4/C3	36.11
9	849	0.120	1 320	A3/B1/C3	36.07
10	849	0.039	1 210	A3/B2/C4	39.89
11	849	0.017	1 590	A3/B3/C1	27.39
12	849	0.009	1 440	A3/B4/C2	32.08
13	837	0.120	1 210	A4/B1/C4	39.87
14	837	0.039	1 320	A4/B2/C3	35.96
15	837	0.017	1 440	A4/B3/C2	31.96
16	837	0.009	1 590	A4/B4/C1	27.26
K₁_i	136.09	135.81	109.86
K₂_i	135.73	135.64	128.52
K₃_i	135.42	135.43	144.29
K₄_i	135.06	135.42	159.64
$K ¯ 1 i$	34.02	33.95	27.47
$K ¯ 2 i$	33.93	33.91	32.13
$K ¯ 3 i$	33.86	33.86	36.07
$K ¯ 4 i$	33.76	33.85	39.91
R	0.26	0.10	12.44

Table 4

Fig.9

Fig.10

Fig.11

Fig.12

Fig.13

Fig.14

Fig.15

Fig.16

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温度/℃	密度/（kg·m^-3）	动力黏度/（mPa·s）	体积弹性模量/MPa		密度/（kg·m^-3）	动力黏度/（mPa·s）	体积弹性模量/MPa
-20	899	3 200.0	1 910	100	823	5.9	1 100
-10	893	1 200.0	1 830	110	816	4.8	1 050
0	887	500.0	1 750	120	810	3.9	1 000
10	881	230.0	1 670	130	804	3.3	960
20	875	120.0	1 590	140	798	2.8	920
30	869	65.0	1 510	150	792	2.4	880
40	862	39.0	1 430	160	786	2.0	850
50	855	26.0	1 350	170	780	1.7	820
60	849	17.0	1 300	180	774	1.4	790
70	843	13.0	1 250	190	768	1.2	770
80	837	9.0	1 200	200	762	1.0	750
90	830	7.0	1 150

参数	数值
仿真步长/s	1×10^-5
仿真时间/s	0.1
负载压力/MPa	30
主轴转速/（r·min^-1）	1 500
斜盘倾角/（°）	9.33
缸体锥度/（°）	5
柱塞球头下死点轨迹半径/mm	95.6
柱塞半径/mm	22.5

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