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惯性矩.
惯性矩可以指:
- 转动惯量:SI 单位为
,可说是一个物体对于旋转运动的惯性,定义为:
![{\displaystyle I_{x}=\int y^{2}\,\mathrm {d} m}](https://wikimedia.org/api/rest_v1/media/math/render/svg/0556cb9e7c0028bccebf12d00ec0ebbbc9f42941)
截面的面积为A,则
![{\displaystyle I_{x}=\int y^{2}\,\mathrm {d} A}](https://wikimedia.org/api/rest_v1/media/math/render/svg/ff3bfda90df3d3d9a929a1cc9e20dab7b6fb781d)
![{\displaystyle I_{y}=\int x^{2}\,\mathrm {d} A}](https://wikimedia.org/api/rest_v1/media/math/render/svg/f3ad9da2e74d53267f23701c0463e3ecd33c9a1d)
分别表示截面对坐标轴x与y的惯性矩,第一式中的y和第二式中的x分别表示面积微元dA到x和到y轴的垂直距离。
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