這是我建立的模型：

就是在左上角的套筒添加動力，使繩子繞右上角的輪子提起重物
問題：每次進行仿真的時候都會彈出下面這段“WARNING”，不過仍然可以繼續進行仿真。后處理后，我將仿真的數據跟一些論文的數據對比了一下，其中發現了一段曲線（左上角套筒的主軸的角加速度）非常的奇怪（圖PO在下面），根據“WARNING”我也大概猜測是在“鋼絲繩”彎曲的部分的軸套力出現了什么問題。不過具體是什么問題我就想不到了，這個問題困擾了我幾天了，不知如何下手，所以想請教一下各位前輩，到底是那部分出錯了導致這樣的問題，學習一下。謝謝了。
異常的曲線：
相比于下面的曲線，它在7.5秒的曲線上下波動很奇怪
論文中的正常的曲線：

下面是每次仿真按鈕按下后，彈出的WARNING：
WARNING: During the construction of simi.bushing_48 an angle measure is created
between two markers, simi.part_48.MARKER_11048 and simi.part_49.MARKER_12048, which do not have
a near-parallel axis of rotation.
I[1.000000, -0.000000, 0.000000] J[0.923880, -0.382683, 0.000000]
WARNING: During the construction of simi.bushing_49 an angle measure is created
between two markers, simi.part_49.MARKER_11049 and simi.part_50.MARKER_12049, which do not have
a near-parallel axis of rotation.
I[0.923880, -0.382683, 0.000000] J[0.707107, -0.707107, 0.000000]
WARNING: During the construction of simi.bushing_50 an angle measure is created
between two markers, simi.part_50.MARKER_11050 and simi.part_51.MARKER_12050, which do not have
a near-parallel axis of rotation.
I[0.707107, -0.707107, 0.000000] J[0.382683, -0.923880, 0.000000]
WARNING: During the construction of simi.bushing_51 an angle measure is created
between two markers, simi.part_51.MARKER_11051 and simi.part_52.MARKER_12051, which do not have
a near-parallel axis of rotation.
I[0.382683, -0.923880, 0.000000] J[-0.000000, -1.000000, 0.000000]
WARNING: During the construction of simi.bushing_48 an angle measure is created
between two markers, simi.part_48.MARKER_11048 and simi.part_49.MARKER_12048, which do not have
a near-parallel axis of rotation.
I[1.000000, -0.000000, 0.000000] J[0.923880, -0.382683, 0.000000]
WARNING: During the construction of simi.bushing_49 an angle measure is created
between two markers, simi.part_49.MARKER_11049 and simi.part_50.MARKER_12049, which do not have
a near-parallel axis of rotation.
I[0.923880, -0.382683, 0.000000] J[0.707107, -0.707107, 0.000000]
WARNING: During the construction of simi.bushing_50 an angle measure is created
between two markers, simi.part_50.MARKER_11050 and simi.part_51.MARKER_12050, which do not have
a near-parallel axis of rotation.
I[0.707107, -0.707107, 0.000000] J[0.382683, -0.923880, 0.000000]
WARNING: During the construction of simi.bushing_51 an angle measure is created
between two markers, simi.part_51.MARKER_11051 and simi.part_52.MARKER_12051, which do not have
a near-parallel axis of rotation.
I[0.382683, -0.923880, 0.000000] J[-0.000000, -1.000000, 0.000000]
WARNING:
The Reconcile Acceleration-Force has detected a singular Jacobian matrix.
This problem may be caused by:
(a) A constraint equations that became almost redundant, e.g., the model
is at a singular configuration or at a bifurcation point.
(b) A massless PARTS in the model.
The Sparse Solver has detected row 1219 has zero length (during the symbolic pivot selection).
The corresponding equation is: Part/207 X Force
A minimization algorithm will be used to find a solution on the
projected constraint manifold.
WARNING:
The Integrator has detected a singular Jacobian matrix.
This problem may be caused by:
(a) A constraint equations that became almost redundant, e.g., the model
is at a singular configuration or at a bifurcation point.
(b) A massless PARTS in the model.
The Calahan Sparse Solver has detected an unexpected singularity at row 6072.
The corresponding equation is: Contact/Contact/Model X Force
A minimization algorithm will be used to find a solution on the
projected constraint manifold.