Page 146 - 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 1543

如图8(a)所示，间隙比增大，最大压力范围增大， 如图9(b)所示，间隙比增大，无空气吸入时，阻尼线性
最小压力范围减小；空气吸入时，最小压力范围较小. 减小，降幅较大；空气吸入时，阻尼略微降低后趋于稳
如图8(b)所示，间隙比增大，空气吸入程度降低；无空 定，数值较小. 如图9(c)所示，间隙比增大，无空气吸入
气吸入时，空化效应减小. 如图8(c)所示，间隙比增大， 时，等效阻尼线性降低；空气吸入时，等效阻尼值略有

空化效应减小；空气吸入时，空化效应受到抑制. 减小，具体数值较小；2种情形下数值比降低. 如图9(e)
提取吸入/无吸入情况下的动特性系数，得到如图9 所示，间隙比增大，无空气吸入时，刚度减速下降；空
所示的分布规律. 如图9(a, d)所示，间隙比增大，阻尼 气吸入时，刚度线性降低. 如图9(f)所示，间隙比增大，

和刚度沿周向坐标变化幅值减小，稳定性得到提升. 平均刚度减小；空气吸入时，降幅较小.

13

12 With air ingestion Without air ingestion 12 With air ingestion Without air ingestion
0.005 0 0.005 0 θ=90° θ=90°
0.005 5 0.005 5 11 θ=180° θ=180°
10 0.006 0 0.006 0 10 9 θ=270° θ=270°
0.006 5
0.006 5
Damping/(10 3 N·s/m) 8 6 Damping/(10 3 N·s/m) 8 7 6 5
θ=360°
θ=360°

2 4 4 3
2
30 60 90 120 150 180 210 240 270 300 330 360 0.005 0 0.005 5 0.006 0 0.006 5
Circumferential coordinate/(°) Clearance ratio
(a) Variation of damping along the (b) Damping change diagram
circumferential coordinates

12 4.0 40 With air ingestion Without air ingestion
Without air ingestion 3.6 35 0.005 0 0.005 0
Equivalent damping/(10 3 N·s/m) 8 6 3.2 Without/with air ingestion Stiffness/(10 5 N/m) 30
With air ingestion
0.005 5
0.005 5
10
Without/with air ingestion
0.006 0
0.006 0
0.006 5
0.006 5
25
20
2.8
15
2.4
10
1.6
2 4 2.0 −5 5 0
0.005 0 0.005 5 0.006 0 0.006 5 30 60 90 120 150 180 210 240 270 300 330 360
Clearance ratio Circumferential coordinate/(°)
(c) Graph of the change of negative work (d) Variation of stiffness along
done by oil film on the journal circumferential coordinates
40 25
With air ingestion Without air ingestion
35 With air ingestion
θ=90° θ=90° 20 Without air ingestion
30 θ=180° θ=180° 15
θ=270°
θ=270°
Stiffness/(10 5 N/m) 20 Average stiffness/(10 5 N/m) 10
25
θ=360°
θ=360°
15
10
5 5 0
0
−5
0.005 0 0.005 5 0.006 0 0.006 5 0.005 0 0.005 5 0.006 0 0.006 5
Clearance ratio Clearance ratio
(e) Stiffness variation diagram (f) Average stiffness variation graph
Fig. 9 Effect of gap ratio on dynamic characteristics at 4 typical moments with/without air ingestion
图 9 考虑空气吸入/不考虑空气吸入在4种典型时刻下间隙比对动态特性影响