[課業] 虛功原理
各位大大 您好,
請問一下虛功原理的正負號怎麼半段呢??
是否要依所訂定的廣義座標來看呢??
如: dW = 0
( + or - ) F1 * dx1 (+ or -) F2 * dy1 = 0
其中:F1 & F2 為外力或者反力
dx1 & dy1 為虛位移
那 + or -怎麼判斷呢?
請高手指點一下~感激!!
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