查询词典 quasi-linear feedback control

The parameters optimization design model is proposed, which is based on a control model with the quasi-Euler angle, Euler angle velocity and absolute angular velocity as the feedback. The vibration-resistance parameters of the given controller are chosen as the optimization variables, and the on-off times of the engines is chosen as the optimization objective function.

基于一类采用拟欧拉角、拟欧拉角速度和飞行器绝对角速度为反馈信号的姿态机动控制模型，以其消振参数为优化变量，开关次数为优化指标，建立了姿态机动参数优化模型。

Analysis shows that the robot model containing uncertainty can be transformed into a quasi—linearized form by using nonlinear feedback and diffeomorphism. Based on this result, a simple design method is proposed for robot tracking control.

第一种算法将谈自忠等提出的机器人反馈线性化控制推广到存在不确定性的情形，指出通过非线性反馈和微分同胚变换可将含不确定性的机器人模型变换成准线性形式，基于此给出一种简单的跟踪器设计方案。

A novel quasi-constant frequency hysteresis PWM control approach is presented in this paper. Frequency feedback is introduced in hysteresis current control to stabilize switching frequency. Comparing with the common used constant frequency current mode control, the new approach has better stability, faster transient and higher precision, as well as elimination of sub-harmonic oscillation.

摘 要：本文提出了一种新的准固定频率滞环PWM电流控制方法，该方法在滞环电流控制的基础上，引入频率反馈控制，使开关频率基本固定，解决了目前广泛使用的固定频率电流控制方法具有的次谐波振荡的问题，并且具有稳定性好、相应速度快、控制精度高的优点。

With an output laser intensity induced negative feedback control of resonator gain, a quasi-continuous prelase with duration of ～100 μs is established, then Q-switch during this prelase .

用输出激光强度负反馈控制谐振腔的增益，建立了准连续的～ 10 0 μs宽预激光状态，然后在此预激光基础上调Q。

Prelase Q-switching method: By using output laser intensity to negatively feedback control the cavity loss, a smooth and quasi-continuous prelase of ～100μs width is built, then the cavity is Q-switched during prelase.

预激光调Q法：用输出激光强度来负反馈控制谐振腔的损耗，建立一个平坦的、准连续的～100μs宽预激光状态，然后在此预激光基础上调Q。

Cynanchum Lingtai apricot production in the average weight 65 grams, the brightly-colored fruit, juicy rich, sweet-sour taste, sweet from the nucleolus, when the late Qing Dynasty famous Shaanxi, Gansu provinces, the Qing imperial court Tongzhi tribute for years.

灵台生产的牛心杏平均单果重65克，果实色泽鲜艳，汁多味浓，甜酸适口，离核仁甜，清末时就驰名陕、甘两省，清同治年间曾为朝廷贡品。

Chenopodium album,Solanum nigrum, and Amaranthus retroflexus were very susceptible to the herbicides. Polygonum persicaria and Abutilon theophrasti were relatively less susceptible to the herbicides, and Lycopersicon esculentum was not susceptible to it. The relationship between reduction rates of weed biomass and PPM values of weed leaves 2,4, and 6 days after treatment was established.

供试的6种杂草对该混剂的敏感性存在显著差异：红心藜Chenopodium album、龙葵Solanum nigrum和反枝苋Amaranthus retroflexus对该混剂最敏感，ED90值分别为47.65、71.67和29.17g/hm2；春蓼Polygonum persicaria和苘麻Abutilon theophrasti敏感，ED90值分别为96.91、114.20g/hm2；而番茄不敏感。