稳态性能英语怎么说及英文单词

❶ 英语论文翻译

If the difference is positive and exceeds a threshold value, the modified method is selected to estimate the cutting force but the proportional constant is multiplied for about 0.2 second in order to consider the slip ratio.如果此差分是正的，并超过某一阈值，那么选择修改的方法来估计切削力，但比例常数被乘以0.2秒，以考虑进滑移率。The estimated cutting force from the synthesized monitor is illustrated in Fig. 2 with the measured signal. 由合成的监控器估计的切削力与实测信号一起图示在图2中。The estimation performance is satisfactory at the steady-state as well as at the transient state. 在稳态以及瞬态下的估计性能是令人满意的。The cutting force in turning process needs to be controlled such that the cutting force is maintained at the reference value regardless of depth of cut, cutting speed, workpiece and tools. 在车削过程中的切削力需加以控制，这样，不管切削深度、切削速度、工件和刀具如何，切削力都将保持在基准值。Because the cutting force cannot be easily measured, the estimated cutting force signal obtained in Section 3 is used for the turning force control.因为切削力不容易测量，所以在第3节中获得的估计的切削力信号被用于车削力的控制。 In order to minimize the error between the reference and the estimated cutting forces, the size of the feed override is determined based on the three control strategies: PI control, adaptive control and finally, fuzzy logic control. 为了尽量减小基准切削力和估计切削力之间的误差，进刀修调的大小要根据三个控制策略来确定：PI（比例积分）控制、自适应控制和模糊逻辑控制。The proposed turning force control system is constructed into the block diagram as shown in Fig. 3. 提出的车削力控制系统被构建成图3所示的框图。The main purpose of this section is to investigate the feasibility of utilizing the estimated cutting force for the turning force control, rather than to compare the control performance of the three strategies.本小节的目的是研究利用估计的切削力来控制车削力的可行性，而不是比较上述三种策略的控制性能。 Thus, the control performance using the estimated cutting force is compared to that using the measured force for each control strategy. 因此，利用估计的切削力进行控制的性能是与利用每种控制策略下的实测力进行控制的性能进行比较。Design of the PI controller requires a dynamic model of the turning process between the feedrate and the cutting force. PI控制器的设计需要车削过程中进刀速度和切削力之间的动态模型。 The turning process can be modeled into a first-order model [15] even if the model parameters, K, and T? 即使模型参数K和T，车削过程也可建模成一阶模型【15】 ？（请注意：这一句和下面一句提问时原文有错）can have different values depending on workpiece, tool, and cutting coditions.where a and f are the depth of cut and the feedrate, respectively 根据工件、刀具、和切削条件可以有不同的值。式中a和f分别是切削深度和进刀速度. A PI controller is designed from a nominal model and its gains are determined using the Ziegler-Nichols method. PI控制器是由标称模型设计的，它的增益用Ziegler-Nichols 方法确定The feed override of the CNC lathe is in the range of 0-255%. CNC车床的进刀修调是在0－255％的范围。The anti-winp regulation is added to the PI controller in order not to deteriorate the control performance when the override command is beyond the operation range. 为了在修调指令超出工作范围时不劣化控制性能，在PI控制器中加入了抗饱和调节。The PI controller can be substituted for the control strategy block in Fig.3. 可以用PI控制器来替代图3中的控制策略方框。In real turning process, parameters of the taming process model like Eq (10) are time-varying and nonlinear depending on cutting conditions, workpiece and cutting tools.在实际的车削过程中，像式（10）那样的车削过程的参数根据切削条件、工件和切削刀具是随时间变化的，而且是非线性的。 Thus, the control specifications such as stability cannot be guaranteed with the classical control approaches. 因此控制的技术条件，如稳定性，用传统的控制方法是不能确保的。Many adaptive control schemes [5-10, 12, 15, 16, etc.] have been developed in order to overcome the above limitations.为了克服上述限制，人们开发了很多自适应控制方案【5－10，12，15，16等】。Because the main purpose of this section is to investigate the feasibility of using the estimated cutting force for the turning force control, a variable gain adaptive controller presented by Lin and Masory [16] is adopted but modified slightly so that the estimated cutting force can be utilized.因为本节的主要目的是研究利用估计的切削力来控制车削力的可行性，所以采用了Lin和Masory【16】介绍的可变增益自适应控制器，但是稍加修改，所以可以利用估计的切削力。
问题补充：The adaptive controller is composed of a force feedback loop where the estimated cutting force is compared to the reference value and is controlled by changing the feedrate in the integrated manner.自适应控制器由一个力反馈回路组成，在这个回路中估计的切削力与基准值进行比较，并通过以整体方式改变进刀速度来加以控制。()are variable controller gain and reference cutting force, respectively. （ ）分别是可变的控制器增益和基准切削力。In order to determine the controller gain, the static gain of the cutting process is estimated first assuming that the estimated cutting force is true.为了确定控制器增益，先假设估计的切削力是正确的，然后估计切削过程的静态增益。 After the static gain is estimated, the controller gain, K., is adjusted to keep the open-loop gain constant. 在估计了静态增益后，控制器增益K被调节而保持开环增益常数。The adaptation loop gains are selected to optimal values [16] so that the controlled system is stable and has optimal performance. 自适应回路增益选为最佳值【16】，因此，受控的系统是稳定的，并具有最佳的性能。The control strategy block in Fig. 3 can be replaced by this adaptive controller.图3中的控制策略方框可以用此自适应控制器取代。4.3 Fuzzy Logic Control4.3 模糊逻辑控制 Because the characteristics of the cutting force versus the feedrate are very nonlinear and time-varying, a fuzzy logic [22] is applied to the controller design. 因为切削力相对于进刀速度的特性是非常非线性的，而且是随时间变化的，所以采用模糊逻辑【22】用于控制器设计。

❷ 稳态性能和稳定性区别

稳定性是动态性能，稳态误差是稳态性能。

以下是稳定性的相关介绍：

稳定性是指“测量仪器保持其计量特性随时间恒定的能力”。通常稳定性是指测量仪器的计量特性随时间不变化的能力。若稳定性不是对时间而言，而是对其他量而言，则应该明确说明。稳定性可以进行定量的表征，主要是确定计量特性随时间变化的关系。

自动控制系统的种类很多，完成的功能也千差万别，有的用来控制温度的变化，有的却要跟踪飞机的飞行轨迹。但是所有系统都有一个共同的特点才能够正常地工作，也就是要满足稳定性的要求。

以上资料参考网络——稳定性