几乎所有这个系统中的转动惯量。
你会得到完全不同的转动惯量。
计算转动惯量，是一个枯燥的活。
我们要去计算关于这个点的转动惯量。
Well, we will try to compute now the moment of inertia about this point.
对圆盘，我们只需要，算出转动惯量。
For the disk, all we have to do now is calculate the moment of inertia.
也就是bMg除以,点P的转动惯量。
So it is bMg divided by the moment of inertia about that point P.
也就是，关于中心处转动惯量的3倍。
例如，关于z轴的转动惯量,是∫∫∫δ
For example, the moment of inertia about the z-axis is dV the triple integral of x squared plus y squared density dV.
它的转动惯量是多少呢？
不用说，转动惯量取决于，你选择的物体。
Needless to say, that the moment of inertia depends on what kind of object you have.
我现在只需要知道，点p的转动惯量是多少。
All I have to know now is what is the moment of inertia about P.
可以计算其转动惯量。
我们得到转动惯量。
若知道转动惯量我就能知道，转动动能是多少。
If I know the moment of inertia, then I know how much rotational kinetic energy there is.
关于绕z轴的转动惯量,到z轴的距离是多少？
OK, so moment of inertia about the z axis so, what's the distance to the z axis?
角频率是，点p的转动惯量。
And angular frequency is the square root inertia about point p.
但它完全不同，转动惯量，如果将其绕这轴旋转。
But it's completely different, the moment of inertia, if you rotated it about this axis.
至于转动惯量，要求的其实是到旋转轴距离的平方。
For the moment of inertia, we want the square of a distance to the axis of rotation.
这是转动惯量。
我这里有四个物体，它们的转动惯量也不同。
I have four objects here, and they all have different moments of inertia.
这有点奇怪，关于x轴的转动惯量跟y有关。
It is slightly strange but I have y in inertia about the x-axis.
提出了一种变等效转动惯量飞轮的设计方法。
The design methods of a flywheel with variable equivalent mass moment of inertial are presented in.
旋转东西有多难，换着来讲的话，是跟转动惯量有关的。
How hard it is to spin something, on the other hand, is given by its moment of inertia.
扭矩除以转动惯量,就会引起角加速度，也就是角速度的导数。
Torque divided by moment of inertia is what will cause the angular acceleration, namely the derivative of angular velocity.
质量块的转动惯量对于剪切失效具有不可忽略的影响。
It is also shown that the influence of the rotary inertia of the mass block on the shear failure is not negligible.
在旋转时，力变成力矩，质量变成转动惯量，加速度变成角加速度。
In rotation, force becomes torque, mass becomes moment of inertia, and acceleration becomes angular acceleration.
我会让你们求一些，比较奇怪的曲线的转动惯量，这些你们都应该知道。
I will ask you for a moment of inertia for some weird line or something like that. OK, but these you should know.
伺服电机有较长的过载能力，有较小的转动惯量和大的堵转转矩。
Servo motor has a long overload ability, have smaller rotary inertia and big plugging around moment.
伺服电机有较长的过载能力，有较小的转动惯量和大的堵转转矩。
Servo motor has a long overload ability, have smaller rotary inertia and big plugging around moment.
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