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Chap2 - 第 2章 力系的简化 力系的简化(Reduction...

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2 2 力系的简化 力系的简化 (Reduction of Force System)
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第 2 章 力系的简化 汇交力系 力偶系 空间任意力系的简化 讨论
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两个或两个以 上的力所构成的系 统称为 力系, 又称 力的集合. 力 系 汇交力系
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空间力系 风力 浮力 重力 阻力
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汇交力系 汇交力系 所有力的作用 线汇交于一点的力 系称为 汇交力系 (concurrent force system)
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汇交力系 一、力在直角坐标轴上的投影与分解 ° ± ° ² ü = = = g b a cos cos cos F F F F F F z y x ° ± ° ² ü = j = = g g j g cos sin sin cos sin F F F F F F z y x
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x y z x y z Fi F j Fk = + + = + + v v v v v v v F F F F 汇交力系
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合成 几何法 力多边形法则 二、汇交力系合成与平衡 汇交力系
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