Study on dynamic balancing method of double cantilever rotor in compressed air energy storage system

doi:10.19799/j.cnki.2095-4239.2024.1238

Abstract

Abstract:

Compressed air energy storage (CAES) systems are recognized for their large-scale capacity and high efficiency, making them one of the most promising technologies for large-scale energy storage. Within a CAES system, the stability of the double-cantilever rotor in the integral gear compressor is a critical focus area. To address rotor vibration alarms caused by the unbalance of the suspended impellers at both ends of the rotor, the multibalance plane field dynamic balancing is usually employed. However, to simplify the balancing process and prolong the service life of double-cantilever rotors, this study investigates the unbalance characteristics and dynamic balancing methods of double-cantilever rotors in CAES systems. First, a model analysis of the double-cantilever rotor of the compressor was carried out using finite element analysis software. The research shows that unbalance at both ends of the double-cantilever rotor can be decoupled into single-end unbalances. This approach eliminates the need for complex dynamic balancing during production. Next, a field dynamic balancing experiment was performed, focusing on one end of the impeller. The study compared the effects of different test weights on the shafting's dynamic balance performance. Experimental results show that greater vibration amplitude and phase changes caused by the addition of test weights led to improved balance effects when determining counterweights. Finally, at the other end of the impeller, the original unbalance of the impeller was completely simulated based on real-world conditions. This validated the effectiveness and universality of the research method. The balance efficiency reached 84.01%.

Key words: compressed air energy storage, rotor dynamics analysis, cantilever rotor, field dynamic balancing, influence coefficient method

CLC Number:

TH 113

Haojie MAO, Xuehui ZHANG, Hanhui JIAO, Heping LI, Yan LIU, Haisheng CHEN. Study on dynamic balancing method of double cantilever rotor in compressed air energy storage system[J]. Energy Storage Science and Technology, 2025, 14(5): 1954-1968.

Figures/Tables 37

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Table 1

Main parameters of double cantilever rotor"

部件	参数	数值	部件	参数	数值
一级叶轮	质量/kg	2.003	齿轮段	长度/mm	125
	直径转动惯量/kg· $m m 2$	3611		齿数	25
	极转动惯量/kg· $m m 2$	6159		齿轮旋向	左
二级叶轮	质量/kg	1.753	总轴段	长度/mm	854.01
	直径转动惯量/kg· $m m 2$	2680		质量/kg	27.829
	极转动惯量/kg· $m m 2$	4602		振动报警值/ $μ m$	40
配重盘	质量/kg	0.2749		振动停机值/ $μ m$	50
	直径转动惯量/kg· $m m 2$	212.65		额定转速/(r/min)	32620
	极转动惯量/kg· $m m 2$	408.26

Table 1

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Table 2

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Table 6

Vibration at each speed under 0.9g/183° test weight"

转子转速	传感器5振动	传感器6振动
6000 r/min	2.24 $μ m$ /-57.48°	1.83 $μ m$ /35.79°
8000 r/min	3.79 $μ m$ /-65.93°	3.89 $μ m$ /40.45°
10000 r/min	4.59 $μ m$ /-87.97°	7.69 $μ m$ /24.62°

Table 6

Table 7

Fig. 29

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参数	数值
轴向长度/mm	60
轴直径/mm	60
半径间隙/mm	0.09
瓦块数	4
瓦块包角/(°)	72

变量	数值
实验1(不同试重质量)	0.72 g/-90°
实验1(不同试重质量)	0.91 g/-90°

实验2(不同试重角度)	0.72 g/-60°
	0.72 g/-90°
	0.72 g/-120°

实验号	试重	转子转速	传感器7计算配重	传感器8计算配重	实际加重
实验1	0.72 g/-90°	6000 r/min	4.21 g/230.83°	4.58 g/222.08°	4.7 g/234.35°
		8000 r/min	4.34 g/235.03°	4.47 g/231.79°
		10000 r/min	4.62 g/236.64°	5.16 g/244.54°

实验2	0.91 g/-90°	6000 r/min	4.51 g/234.94°	4.47 g/221.6°	4.56 g/230.45°
		8000 r/min	4.02 g/232.98°	3.97 g/222.1°
		10000 r/min	5.48 g/236.38°	4.44 g/226.2°

实验号	试重	转子转速	传感器7计算配重	传感器8计算配重	实际加重
实验3	0.72 g/-60°	6000 r/min	2.89 g/228.74°	3.23 g/224.49°	2.84 g/229.75°
		8000 r/min	2.48 g/232.47°	2.61 g/225.63°
		10000 r/min	3.09 g/235.17°	2.70 g/231.95°

实验4	0.72 g/-120°	6000 r/min	7.66 g/232.9°	6.94 g/216.08°	6.23 g/235.96°
		8000 r/min	6.6 g/234.5°	6.44 g/218.31°
		10000 r/min	4.81 g/265.67°	4.92 g/248.33°

转子转速	传感器5计算配重	传感器6计算配重
6000 r/min	1.47 g/258.69°	1.17 g/235.6°
8000 r/min	1.06 g/272.14°	1.05 g/242.5°
10000 r/min	0.78 g/280.46°	1.06 g/243.14°