【摘要】 因为奈魁斯特轨迹不能通过G(s)H(s)的极点和零点。如果G(s)H(s)具有在原点和jw轴上的零极点,则奈魁斯特轨迹必须修正。这篇文章使用的轨迹修正方法是在原点或jw轴上的零极点处使用半径为无穷小ε的半园,变点S沿半径ε(ε《1)的半园以顺时针方向从s=jo~-到s=jo~+。在这种情况下,奈魁斯特判据必须修正。本文给出证明和结论。更多还原

【Abstract】 Since the Nyquist path must not pass through poles or zeros of G_S H_S. If the function G_S H（S） has poles or zeros at the origin （or on the jw axis）, the contour in the splane must be modified. The article used way of modifying the contour near the poles or zeros at the origin cot on the waxis is to use a semicircle with infinitesimal radius Arepre sentative point Smoves along the semicircle of radius e （where ε《1） froms=jo^-to s=jo⁺ in the clockwise direction. In this case Nyquisth stability criterion must be modified. The Paper has given argument and conclusion.更多还原