Page 142 - 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 1539

16 16

With air ingestion Without air ingestion With air ingestion Without air ingestion
14 50 Hz 50 Hz 14 θ=90° θ=90°
100 Hz 100 Hz 12 θ=180° θ=180°
150 Hz
150 Hz
θ=270°
θ=270°
12
θ=360°
200 Hz
200 Hz
θ=360°
Damping/(10 3 N·s/m) 10 8 6 Damping/(10 3 N·s/m) 10 8 6
2 4 4 2
0 0
30 60 90 120 150 180 210 240 270 300 330 360 60 80 100 120 140 160 180 200
Circumferential coordinate/(°) Whirl frequency/Hz
(a) Variation of damping along the (b) Damping change diagram
circumferential coordinates
2.2 4.0 90 With air ingestion Without air ingestion
2.0 Without air ingestion 3.8 50 Hz 50 Hz
With air ingestion
1.8 Without/with air ingestion 3.6 80 100 Hz 100 Hz
150 Hz
150 Hz
70
Negative work done/J 1.4 3.2 Without/with air ingestion Stiffness/(10 5 N/m) 60
200 Hz
1.6
200 Hz
3.4
50
1.2
3.0
40
1.0
2.8
30
0.8
0.6
2.4
10
0.4 2.6 20
2.2
0.2 0
60 80 100 120 140 160 180 200 30 60 90 120 150 180 210 240 270 300 330 360
Whirl frequency/Hz Circumferential coordinate/(°)
(c) Graph of the change of negative work (d) Variation of stiffness along
done by oil film on the journal circumferential coordinates
80 60
With air ingestion Without air ingestion With air ingestion
70 θ=90° θ=90° Without air ingestion
θ=180° θ=180° 50
60 θ=270° θ=270° 40
θ=360°
Stiffness/(10 5 N/m) 40 Average stiffness/(10 5 N/m) 30
θ=360°
50
30
20 20
10 10
0 0
60 80 100 120 140 160 180 200 60 80 100 120 140 160 180 200
Whirl frequency/Hz Whirl frequency/Hz
(e) Stiffness variation diagram (f) Average stiffness variation graph
Fig. 5 Effect of whirl frequency on dynamic characteristics at four moments with/without air ingestion
图 5 考虑空气吸入/不考虑空气吸入在4种时刻下进动频率对动态特性影响
如图5所示，图例中“With air ingestion”对应实线表 示，进动频率增大，无空气吸入时，阻尼线性减小；空
示考虑空气吸入时的数值变化，“Without air ingestion” 气吸入时，阻尼轻微下降后逐渐趋于稳定. 如图5(c)所
对应虚线表示不考虑空气吸入时的数值变化，图5(c) 示，进动频率增大，油膜对轴颈所做负功呈线性增大；
中“Without/With air ingestion”对应实线表示不考虑 空气吸入时，增幅及具体数值较小. 如图5(d)所示，空
空气吸入情形与考虑空气吸入情形数值的比值，后续 气吸入时，沿周向坐标的刚度波动和具体数值都较小.
表示方法相同，不再赘述. 如图5(a)所示，空气吸入时， 如图5(e)所示，进动频率增大，无空气吸入时，刚度线
阻尼值小，稳定性好，这是因为空气吸入使得流体黏 性增大；空气吸入时，刚度趋于稳定. 如图5(f)所示，进
度降低，静偏心对阻尼稳定性影响减小. 如图5(b)所 动频率增大，无空气吸入时，平均刚度线性增大；空气