直线函数 meaning in Chinese

straight line function

But modern electrohydraulic servo systems have obvious nonlinear characteristics and often are required to have the ability to trace any curve function and endure relatively big outer disturb . so the working dot of the system changes greatly during the working process , which makes the linear model inapplicable
然而电液伺服系统中存在着明显的非线性特征且近代电液伺服系统往往要求系统具有点点跟踪任意非直线函数的能力并能够承受较强的外负载干扰，因此工作过程中系统的工作点在较大的范围内变化，从而使增量线性化模型难于奏效。