关于ADAMS钢丝绳建模的一个问题，初学者来请教下各位前辈

这是我建立的模型：

就是在左上角的套筒添加动力，使绳子绕右上角的轮子提起重物
问题：每次进行仿真的时候都会弹出下面这段“WARNING”，不过仍然可以继续进行仿真。后处理后，我将仿真的数据跟一些论文的数据对比了一下，其中发现了一段曲线（左上角套筒的主轴的角加速度）非常的奇怪（图PO在下面），根据“WARNING”我也大概猜测是在“钢丝绳”弯曲的部分的轴套力出现了什么问题。不过具体是什么问题我就想不到了，这个问题困扰了我几天了，不知如何下手，所以想请教一下各位前辈，到底是那部分出错了导致这样的问题，学习一下。谢谢了。
异常的曲线：
相比于下面的曲线，它在7.5秒的曲线上下波动很奇怪
论文中的正常的曲线：

下面是每次仿真按钮按下后，弹出的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.