Page 149 - 摩擦学学报2025年第10期
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1546                                   摩擦学学报(中英文)                                        第 45 卷

            效阻尼比降低. 如图11(e)所示,供油压力增大,无空气                       展分析,提取吸入/无吸入情况下的动特性系数,其分

            吸入时,刚度小幅降低,不同时刻下刚度大小为3/4 T>                        布规律如图12所示.
            1.0 T>1/2 T>1/4 T;空气吸入,刚度线性增大. 如图11(f)                 如图12(a)和(d)所示,空气吸入时,阻尼和刚度沿
            所示,供油压力增大,无空气吸入时,平均刚度小幅降                           周向坐标变化幅值较小,黏度影响较小. 如图12(b)和

            低;空气吸入时,平均刚度线性增大.                                  (e)所示,黏度增大,无空气吸入时,阻尼和刚度线性增
             2.7    滑油黏度对油膜动特性影响分析                             加,且增幅较大;空气吸入时,阻尼、刚度小幅增大后
                为了研究滑油黏度对空气吸入SFD油膜动特性系                         趋于稳定. 如图12(c)所示,黏度增大,无空气吸入时,
            数影响规律,选取典型滑油黏度范围0.03~0.06 Pa·s开                    等效阻尼线性增大;空气吸入时,等效阻尼趋于稳定.
                  14                                                  12

                      With air ingestion     Without air ingestion    11  With air ingestion  Without air ingestion
                  12       0.03 Pa·s      0.03 Pa·s                   10 9            θ=90°   θ=90°
                                                                                             θ=180°
                                                                              θ=180°
                           0.04 Pa·s
                                          0.04 Pa·s
                                                                              θ=270°
                                                                                             θ=270°
                                          0.05 Pa·s
                           0.05 Pa·s
                 Damping/(10 3  N·s/m)  8 6                          Damping/(10 3  N·s/m)  8 7 6 5
                                                                                             θ=360°
                                                                              θ=360°
                                           0.06 Pa·s
                  10
                          0.06 Pa·s
                   2 4                                                 4 3
                                                                       2
                    30 60 90 120 150 180 210 240 270 300 330 360        0.030  0.035  0.040  0.045  0.050  0.055  0.060
                          Circumferential coordinate/(°)                            Viscosity/(Pa·s)
                       (a) Variation of damping along the                     (b) Damping change diagram
                          circumferential coordinates
                  10                               4.0               40
                         Without air ingestion     3.6               35   With air ingestion  Without air ingestion
                   9
                  Equivalent damping/(10 3  N·s/m)  7 6 5 4  3.2 Without/with air ingestion  Stiffness/(10 5  N/m)  25    0.06 Pa·s    0.06 Pa·s
                                                                               0.03 Pa·s
                         With air ingestion
                                                                                             0.03 Pa·s
                                                                                              0.04 Pa·s
                                                                               0.04 Pa·s
                                                                     30
                         Without/with air ingestion
                   8
                                                                                              0.05 Pa·s
                                                                               0.05 Pa·s
                                                                     20
                                                   2.8
                                                                     15
                                                   2.4
                                                                     10
                                                   1.6
                   2 3                             2.0                5 0
                     0.030 0.035 0.040 0.045 0.050 0.055 0.060         30 60 90 120 150 180 210 240 270 300 330 360
                               Viscosity/(Pa·s)                               Circumferential coordinate/(°)
                     (c) Graph of the change of negative work                (d) Variation of stiffness along
                         done by oil film on the journal                       circumferential coordinates
                  30  With air ingestion  Without air ingestion       20      With air ingestion
                           θ=90°            θ=90°
                  25       θ=180°           θ=180°                    16      Without air ingestion
                                            θ=270°
                           θ=270°
                 Stiffness/(10 5  N/m)  15                           Average stiffness/(10 5  N/m)  12 8
                                            θ=360°
                           θ=360°
                  20
                  10
                   5                                                  4
                   0                                                  0
                    0.03       0.04      0.05      0.06                0.030  0.035  0.040  0.045  0.050  0.055  0.060
                                Viscosity/(Pa·s)                                    Viscosity/(Pa·s)
                         (e) Stiffness variation diagram                    (f) Average stiffness variation graph
                          Fig. 12    Viscosity effect on dynamic properties at 4 typical moments with/without air ingestion
                               图 12    考虑空气吸入/不考虑空气吸入在4种典型时刻下黏度对动态特性影响
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