Page 144 - 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 1541

的SFD，应留有足够的安全裕度. 如图6(d)所示，静偏 2.3 进动半径对油膜动特性影响分析
心率增大，无空气吸入时，刚度沿周向坐标变化幅值 为了研究进动半径对空气吸入SFD油膜动特性系
增大；空气吸入时，变化幅值显著降低. 如图6(e)所示， 数影响规律，选取典型进动半径范围0.077~0.192 5 mm
静偏心率增大，无空气吸入时，3/4 T和T时刻刚度增 开展分析，提取吸入/无吸入情况下的动特性系数，其
大，1/2 T和1/4 T时刻刚度减小；空气吸入时，刚度增 分布规律如图7所示.
幅和具体数值较小. 如图6(f)所示，静偏心率增大，无 如图7(a)所示，进动半径增大，空气吸入时，阻尼
空气吸入时，平均刚度明显增大；空气吸入时，其增幅 沿周向坐标变化幅值较小，阻尼稳定性好. 如图7(b)所

和具体数值均较小. 示，进动半径增大，无空气吸入时，阻尼线性增大，且

14 11

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

12 0.077 0 mm 0.077 0 mm 10 9 θ=90° θ=90°
0.115 5 mm
0.115 5 mm
θ=180°
θ=180°
0.154 0 mm
0.154 0 mm
Damping/[10 3 N/(s·m)] 8 6 Damping/[10 3 N/(s·m)] 8 7 6 5
θ=270°
θ=270°
0.192 5 mm
0.192 5 mm
10
θ=360°
θ=360°
2 4 4 3
2
30 60 90 120 150 180 210 240 270 300 330 360 0.08 0.10 0.12 0.14 0.16 0.18 0.20
Circumferential coordinate/(°) Whirl radius/mm
(a) Variation of damping along the (b) Damping change diagram
circumferential coordinates
4.0 8
1.4 Without air ingestion With air ingestion Without air ingestion
6 0.077 0 mm 0.077 0 mm
With air ingestion
1.2 Without/with air ingestion 3.5 4 0.115 5 mm 0.115 5 mm
0.154 0 mm
0.154 0 mm
Negative work done/J 0.8 2.5 Without/with air ingestion Stiffness/(10 5 N/m) −2 2 0
0.192 5 mm
0.192 5 mm
1.0
3.0
0.6
2.0
0.4
0.2 1.5 −4
−6
0.0 1.0 −8
0.08 0.10 0.12 0.14 0.16 0.18 0.20 30 60 90 120 150 180 210 240 270 300 330 360
Whirl radius/mm Circumferential coordinate/(°)
(c) Graph of the change of negative work (d) Variation of stiffness along
done by oil film on the journal circumferential coordinates
35
With air ingestion Without air ingestion 21 With air ingestion
30
θ=90° θ=90° 18 Without air ingestion
25 θ=180° θ=180° 15
Stiffness/(10 5 N/m) 15 Average stiffness/(10 5 N/m) 9 6 3
θ=270°
θ=270°
θ=360°
θ=360°
20
12
10
0 5 −3 0
−5 −6
0.08 0.10 0.12 0.14 0.16 0.18 0.20 0.08 0.10 0.12 0.14 0.16 0.18 0.20
Whirl radius/mm Whirl radius/mm
(e) Stiffness variation diagram (f) Average stiffness variation graph
Fig. 7 Effect of whirl radius on dynamic characteristics at four typical moments with/without air ingestion
图 7 考虑空气吸入/不考虑空气吸入在4种典型时刻下进动半径对动态特性影响