drift n. 1.漂亮;(潮流的)推进力。 2.漂流物;吹积物;堆积物;【地质学;地理学】冰碛,漂砾。 3.倾向,趋势;动向。 4.大意,要点,要旨。 5.(政策等的)坐观,放任自流。 6.流速;(船等的)流程,漂流距离;(滑车的)伸展距离。 7.(仪表的)漂移;偏移;【海,空】偏航,偏流;(飞弹的)航差;【无线电】偏移;偏差。 8.【矿物】水平巷道;小平道。 9.〔南非〕浅滩,滩。 10.【机械工程】冲头,冲孔器;打桩器。 11.〔方言〕(鸟等)群。 against the drift of a current 顶着潮流的压力。 be in a state of drift 心不自主,放任自流。 D- is as bad as unthrift. 放任自流和浪费一样坏。 a policy of drift 放任主义[政策]。 a drift of snow [leaves] 吹积成的雪[树叶]堆。 the amount of drift (船的)漂流距离。 a drift toward nationalism 民族主义的倾向。 the drift of an argument 争论的要点。 catch the drift of a talk 抓住谈话的要点。 a drift of ice 流冰。 a drift of sheep 羊群。 the drift of Nature 造化的威力。 electronic drift 电子(仪器)的漂移。 vt. 1.使漂流;使漂积[冲积];把…吹积;(吹积物等)覆盖。 2.【机械工程】(用冲头)冲孔。 The current drift-ed the boat to sea. 水流把船冲到海里去了。 a trail drift-ed with leaves 满是落叶的小道。 The wind drifted the snow. 风把雪吹成小堆。 vi. 1.漂,漂流;漂移;游荡。 2.被吹积成堆。 3.心不由主地走;不知不觉地陷入 (into) 渐渐趋向 (toward)。 perfume drifting into the room 飘进屋里的香气。 drift toward ruin 逐渐走向毁灭[破产]。 He drifted from town to town. 他在各个城市流浪。 drifting sand 吹积成的沙堆。 drift apart from sb. 逐渐疏远某人。 drift off to sleep 慢慢地睡着了。 drift down the river 顺流而下。 drift (along) (through life) 随波逐流地过一辈子。 drift into (errors) 不自觉地犯了错误。 let things drift 听天由命。
Adopting new-type temperature stick, have steady performance, small parameter drifts, high precision, the error is smaller than 采用新型温度探头,性能稳定,参数漂移小,精度高,误差小于
In this thesis, we investigate the fault diagnosis for a hydraulic system with severe nonlinearity under nine different operation conditions using bp neural networks . sensors " fault are considered, which include abrupt parameter changes and slowly parameter drifting 对很多系统而言,当系统性能下降时(非故障引起),如果这时系统某一部位发生故障,由于故障受系统自身的非线性特性影响,使故障诊断变的十分困难,从而会引起误报或漏报。
By combining the parameter smooth projection algorithm and the integral-type lyapunov design technology with the sliding mode design technology with boundary layer, the performances for the system to avoid the parameter drift phenomena, the chattering phenomena, and the controller singularity problem were improved 通过将参数光滑投影算法,带饱和层的滑模面设计技术以及积分型李雅普诺夫设计技术集成起来,使得算法提高了系统在抑制参数漂移、抖振现象、控制器奇异等方面的能力。
Because the essence of fuzzy control is nonlinear control and adaptive control, fuzzy control could be well done for those complicated, nonlinear systems with the characteristic of the parameter drift and the inaccurate examining signal in the complicated industry controlled process, the controlled objects usually own the nonlinear, time-change characteristic and exists the category of interferences 由于模糊控制的本质是非线性控制和自适应控制,对于参数波动或检测信号不太精确的复杂非线性多变量系统也能很好地工作。特别是对于参数波动和负载干扰的影响,具有较强的鲁棒性。
In this controller, online parameters estimating algorithm is added to classical sliding mode controller to achieve both robustness and adaptability, to prevent noise and disturbances from causing parameter drift, a dead-zone is added to shut adaptation off for small tracking errors, and the adaptation law is modified to guarantee the estimated parameters in previously known ranges 其特点是在滑模控制的基础上引入自适应机制,在线估计不确定参数,从而消除参数不确定性对系统性能的影响,在保证鲁棒性的基础上减小了滑模控制附加项的幅值。考虑到可能出现的参数漂移,提出了自适应律的两点改进。