The existence conditions of helical equilibrium are discussed as a special configuration of the rod. 作为特殊的平衡状态,讨论杆的螺旋线平衡的存在条件。
The stability of the helical equilibrium is analyzed with phase plane method, and an analytical criterion of stability is revealed. 用相平面法分析螺旋线平衡的稳定性,导出解析形式的稳定性条件。