论文标题
使用线性独立转子旋转运动来识别环形间隙的动态力和力矩特征
Identification of the dynamic force and moment characteristics of annular gaps using linear independent rotor whirling motions
论文作者
论文摘要
如今，大多数关于环形差距动态特性的研究仅集中在翻译动作引起的力特征上，而倾斜和力矩系数的研究较少。因此，对于可用于验证目的的其他系数几乎没有任何可靠的实验数据。为了改善这一点，使用Kuhr（2022）首先提出的测试钻机用于实验确定三个不同长度的Annuli的动态力和矩特征。通过使用活跃的磁轴承，测量了转子用用户定义的频率激发转子，转子位置以及环路中流场引起的力和力矩被测量。为了获得准确且可靠的实验数据，进行了广泛的初步研究，以确定测试钻机的已知特征以及测试钻机施加的添加质量和惯性。随后，进行了详尽的不确定性定量，以量化测量不确定性。将实验结果，即48个旋转动力系数，与一种新的计算方法进行了比较。结果表明，提出的实验数据与计算方法非常吻合，特别是对于其他动力学倾斜和矩系数。此外，表明环长显着影响第一个亚矩阵的系数。额外系数对长度的依赖性是可识别的，但不太明显。即使是最短研究的环，即l = 1，由于转子角运动的力量引起的刚度系数与由于翻译运动的力引起的刚度系数的数量级相同。这支持了最近的结果，表明附加系数比整个文献中的假设要早得多，参见。 Childs（1993）。
Nowadays, most studies on the dynamic properties of annular gaps focus only on the force characteristics due to translational motions, while the tilt and moment coefficients are less well studied. Therefore, there is hardly any reliable experimental data for the additional coefficients that can be used for validation purpose. To improve this, a test rig first presented by Kuhr (2022) is used to experimentally determine the dynamic force and moment characteristics of three annuli of different lengths. By using active magnetic bearings, the rotor is excited with user-defined frequencies and the rotor position and the forces and moments induced by the flow field in the annulus are measured. To obtain accurate and reliable experimental data, extensive preliminary studies are carried out to determine the known characteristics of the test rig rotor and the added mass and inertia imposed by the test rig. Subsequently, an elaborate uncertainty quantification is carried out to quantify the measurement uncertainties. The experimental results, i.e. the 48 rotordynamic coefficients, are compared to a new calculation method. It is shown that the presented experimental data agree well with the calculation method, especially for the additional rotordynamic tilt and moment coefficients. Furthermore, it is shown that the annulus length significantly influences the coefficients of the first sub-matrix. A dependence of the additional coefficients on the length is recognisable, but less pronounced. Even for the shortest investigated annulus, i.e. L = 1, the stiffness coefficients due to the forces from the angular motion of the rotor are of the same order of magnitude as the stiffness coefficients due to the forces from the translational motion. This supports recent results, indicating that the additional coefficients become relevant much earlier than assumed throughout the literature, cf. Childs (1993).
