Research on the Heat Generation Mechanism and Thermodynamic Model of Hydro-pneumatic Spring for Tracked Vehicles

doi:10.12382/bgxb.2023.0626

Abstract

Abstract:

A parametric thermodynamic model for the hydro-pneumatic spring of tracked vehicle is established to explore the mechanism of heat generation of hydro-pneumatic spring during working process. The damping indicator characteristics of hydro-pneumatic spring are numerically fitted through test data acquisition, and a mathematical expression of piston velocity-damping force is obtained by data fitting. Based on the analysis of the heat transfer path and characteristics of hydro-pneumatic spring, a thermal resistance network model of hydro-pneumatic spring is established, and the temperature changes of two working medias of hydro-pneumatic spring are calculated. The calculated results of thermodynamic model for the hydro-pneumatic spring are verified by test. The results show that the work done by the damping force is the main heat source for the temperature rise of hydro-pneumatic spring. Under the same working condition, the oil temperature rises faster than the gas temperature and the oil equilibrium temperature is higher. The thermodynamic model can accurately calculate the temperature rise of hydro-pneumatic spring in different working medias, and provides a reference for studying the thermo-mechanical coupling dynamics of hydro-pneumatic spring.

Key words: heat generation mechanism, energy exchange, thermal resistance network, temperature distribution, equilibrium temperature

CLC Number:

TB123

NIE Wei, HE Hongwen, SUN Yu, WAN Yiqiang. Research on the Heat Generation Mechanism and Thermodynamic Model of Hydro-pneumatic Spring for Tracked Vehicles[J]. Acta Armamentarii, 2024, 45(10): 3555-3563.

Figures/Tables 17

Fig.1 Structure diagram of hydro-pneumatic spring

Fig.2 Velocity-damping force relationship

Fig.3 Velocity-friction relationship

Fig.4 Thermal resistance network diagram of hydro-pneumatic spring

Fig.5 Thermodynamic model of hydro-pneumatic spring

Table 1 Simulation parameters

材料参数	数值
油液导热系数/(W·m^-1·K^-1)	0.145
油液比热容/(J·kg^-1·K^-1)	1910
油液动力黏度/(N·s·m^-2)	1.35×10^-2
金属导热系数/(W·m^-1·K^-1)	51.9
金属比热容/(J·kg^-1·K^-1)	489.9
氮气导热系数/(W·m^-1·K^-1)	2.05×10^-2

Fig.6 Simulated results of oil temperature rise under different excitation frequency

Fig.7 Simulated results of gas temperature rise under different excitation frequencies

Fig.8 Simulated results of oil temperature rise under different external wind speeds

Fig.9 Simulated results of gas temperature rise under different external wind speeds

Fig.10 Photo of hydro-pneumatic spring test

Fig.11 Comparison of test data of oil temperature rise under different excitation frequencies

Fig.12 Comparison of gas temperature rise test data under different excitation frequencies

Table 2 Comparison of simulated and experimental data under different excitation frequencies

频率	时间/ s	油液温度/℃			气体温度/℃
频率	时间/ s	仿真结果	试验数据	相对误差%	仿真结果	试验数据	相对误差%
	7000	79.2	79.9	0.88	27.9	25.3	9.32
1.0	8000	79.5	79.3	0.25	28.0	26.6	5.00
	9000	79.9	81.0	1.38	28.0	25.8	7.80
	7000	130.7	135.9	3.98	45.0	42.7	5.11
1.5	8000	136.4	125.8	7.77	45.1	42.2	6.43
	9000	136.7	126.5	7.46	45.2	42.7	5.53
	7000	166.0	158.1	4.76	60.8	58.8	3.29
2.0	8000	166.6	159.6	4.20	61.0	58.6	3.93
	9000	167.1	159.2	4.73	61.1	60.1	1.64

Fig.13 Comparison of oil temperature rise test data under different external wind speeds

Fig.14 Comparison of gas temperature rise test data under different external wind speeds

Table 3 Comparison of simulated and experimental data under different heat-dissipating conditions

风速/ (m·s^-1)	时间/ s	油液温度/℃			气体温度/℃
风速/ (m·s^-1)	时间/ s	仿真结果	试验数据	相对误差/%	仿真结果	试验数据	相对误差/%
	7000	98.6	95.4	3.25	32.8	33.9	3.35
10	8000	98.9	96.7	2.22	32.9	33.8	2.74
	9000	99.3	97.0	2.32	33.0	33.5	1.52
	7000	88.7	88.7	0	29.4	29.1	1.02
12	8000	89.0	87.8	1.35	29.4	30.4	3.40
	9000	89.5	88.1	1.56	29.4	30.5	3.75
	7000	80.2	78.4	2.24	25.2	25.4	0.79
14	8000	80.3	78.0	2.86	25.2	26.6	5.56
	9000	80.5	79.1	1.74	25.2	26.3	4.37

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