Page 148 - 摩擦学学报2025年第10期

第 10 期 孙逸豪, 等: 空气吸入对挤压油膜阻尼器油膜动特性影响研究 1545

宽度增大，无空气吸入时，平均刚度先稳定后线性增 周向坐标变化幅值较小，阻尼和刚度较稳定. 如图11(b)

大；空气吸入时，平均刚度线性增大，增幅较小. 所示，供油压力增大，无空气吸入时，阻尼略有增大，
2.6 供油压力对油膜动特性影响分析 不同时刻下阻尼大小为3/4 T>1.0 T>1/2 T>1/4 T；空气
为了研究供油压力对空气吸入SFD油膜动特性系 吸入时，阻尼增幅较大但数值较小，这是因为空气吸
数影响规律，选取典型供油压力范围10~40 kPa开展 入受到抑制，流体黏度增大，动压效应增强；设计时若
分析，提取吸入/无吸入情况下的动特性系数，其分布 需要更大阻尼，可通过提高供油压力实现. 如图11(c)

规律如图11所示. 所示，供油压力增大，无空气吸入时，等效阻尼略有增
如图11(a)和(d)所示，空气吸入时，阻尼和刚度沿 大；空气吸入时，等效阻尼线性增加；2种情形下的等
14 14

With air ingestion Without air ingestion With air ingestion Without air ingestion

12 10 kPa 10 kPa 12 θ=90° θ=90°
20 kPa 20 kPa 10 θ=180° θ=180°
θ=270°
θ=270°
30 kPa
30 kPa
θ=360°
θ=360°
Damping/(10 3 N·s/m) 8 6 Damping/(10 3 N·s/m) 8 6
40 kPa
40 kPa
10
2 4 4 2
30 60 90 120 150 180 210 240 270 300 330 360 10 15 20 25 30 35 40
Circumferential coordinate/(°) Oil supply pressure/kPa
(a) Variation of damping along the (b) Damping change diagram
circumferential coordinates
13 5.0 40
Without air ingestion
12 With air ingestion 4.5 30 With air ingestion Without air ingestion
10 kPa
10 kPa
11
Equivalent amping/(10 3 N·s/m) 9 8 7 6 5 4 4.0 Without/with air ingestion Stiffness/(10 5 N/m) 20
20 kPa
20 kPa
30 kPa
30 kPa
10
Without/with air ingestion
40 kPa
40 kPa
3.5
3.0
10
2.0
1 3 2 2.5 0
10 15 20 25 30 35 40 30 60 90 120 150 180 210 240 270 300 330 360
Oil supply pressure/kPa Circumferential coordinate/(°)
(c) Graph of the change of negative work (d) Variation of stiffness along circumferential
done by oil film on the journal coordinates
40
With air ingestion Without air ingestion 24 With air ingestion
θ=90° θ=90°
θ=180° θ=180° 20 Without air ingestion
30
θ=270°
θ=270°
Stiffness/(10 5 N/m) 20 Average stiffness/(10 5 N/m) 16 8
θ=360°
θ=360°
12
10
0 4
0
10 15 20 25 30 35 40 10 15 20 25 30 35 40
Oil supply pressure/kPa Oil supply pressure/kPa
(e) Stiffness variation diagram (f) Average stiffness variation graph
Fig. 11 Effect of oil supply pressure on dynamic characteristics at 4 typical moments with/without air ingestion
图 11 考虑空气吸入/不考虑空气吸入在4种典型时刻下供油压力对动态特性影响