lower control line 中文意思是什麼
lower control line
解釋
管制下限-
The conventional variable structure control technique for uncertain system requires that the uncertainty bound is known as a premise to assure robustness. the requirement creates an over - conservative controller and enlarges chattering. the proposed controller regards the influence of unknown disturbances and parameter uncertainties as an equivalent disturbance and generates an on - line estimation used in smc to cancel the slowly varying uncertainties by the mechanism of time delay. the reaching law approach is used to get the conditions and band of quasi - sliding mode. the new methodology offers a robust feedback control with much lower gains and reduces chattering without a prior knowledge of the uncertainty bounds or matched conditions
常規變結構控制用於不確定系統，須利用不確定性界確保系統的魯棒性，控制器過于保守且抖振變大.本文把未知干擾和參數不確定性的影響等效為名義系統的外界干擾，利用時延技術對干擾進行在線估計，並將估計值引入到變結構控制中，從而抵消掉系統中的慢變不確定性，利用離散趨近律法，推出了準滑動模態的存在條件及其帶寬.該方法克服了以往控制方法中須已知不確定性界的限制，且不必滿足匹配條件，用較低的控制增益保證了系統的魯棒性，降低了準滑動模態帶即削弱了抖振 -
Abstract : the conventional variable structure control technique for uncertain system requires that the uncertainty bound is known as a premise to assure robustness. the requirement creates an over - conservative controller and enlarges chattering. the proposed controller regards the influence of unknown disturbances and parameter uncertainties as an equivalent disturbance and generates an on - line estimation used in smc to cancel the slowly varying uncertainties by the mechanism of time delay. the reaching law approach is used to get the conditions and band of quasi - sliding mode. the new methodology offers a robust feedback control with much lower gains and reduces chattering without a prior knowledge of the uncertainty bounds or matched conditions
文摘:常規變結構控制用於不確定系統，須利用不確定性界確保系統的魯棒性，控制器過于保守且抖振變大.本文把未知干擾和參數不確定性的影響等效為名義系統的外界干擾，利用時延技術對干擾進行在線估計，並將估計值引入到變結構控制中，從而抵消掉系統中的慢變不確定性，利用離散趨近律法，推出了準滑動模態的存在條件及其帶寬.該方法克服了以往控制方法中須已知不確定性界的限制，且不必滿足匹配條件，用較低的控制增益保證了系統的魯棒性，降低了準滑動模態帶即削弱了抖振 -
* the huge american market results from huge military helicopter demand, oil crisis in 1970s, government policy and etc. but chinese market is confined by comparatively lower gdp, weak military demand, preliminary air control and powerless industry association. * facing the keen competition, catic should further strengthen its competitive advantage in helicopter sales ability, extend its business line to supply service for helicopters such as fixed base operation
*面對日益激烈的競爭環境，中航技公司應該大力增強其在銷售領域的競爭優勢，圍繞航空產品和技術進出口這一核心業務向外圍擴展，進入直升機運營領域開展直升機服務業務及運營通用航空服務站，在新產品的研發方面則應以起飛重量不超過4噸的單發渦軸直升機為主，採用合資合作等方式。 -
But in our country, the technique level of mdf production is relatively lower than that of foreign ' s. comparing with the introduced product line, the line of our country has some weak points still. and the domestic product line seldom designs the corresponding computer monitored control system
生產線尚存在一些不足之處，與引進生產線相比，國產的mdf生產線很少配套設計計算機監控系統，只是近幾年來部分工段採用了plc控制，計算機控制技術的應用則相對落後。 -
In this paper, aiming at the control communication problem of satellite communication antenna system, the particularity of the communication part of the equipments which have relative movement is analyzed, and comparing to formerly communicationg project, a new project to resolve the communication problem is put forward, namely lower voltage power line carrier technology
本文針對衛星通信天線系統中的控制通信問題，分析了有相對運動設備間通信的特殊性，並與之前所用的通信方案進行了對比，提出了一種新的方案來解決該通信問題，即利用低壓電力線載波技術來實現通信。
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