切壓制模法 的英文怎麼說
中文拼音 [qiēyāzhìmófǎ]
切壓制模法
英文
hubbing-
To avoid the serious electromagnetic interferer, the analog signals are transformed to frequency pulses which are transferred to the kernel of the system. in the measure of the groove voltage, the method of float - ground is adopted to avoid the high common signal and the range switch circuit is designed to solve the conflict of the wide dynamic range and the high precision. least square curvefit is adopted to reduce the system error
鋁電解生產現場電磁干擾非常嚴重，為此我們將需要測量的模擬信號就近轉換為頻率脈沖后再傳送到控制核心；採用浮地接入方式消除槽電壓信號中的共模成分；設計了量程自動切換電路以解決槽電壓的動態范圍寬和測量精度高的矛盾；用最小二乘法進行曲線擬和以降低測量的系統誤差。Making use of many layers composite technique and heat press technique to make artificial skull, through a series of performance testes ( including elongate performance, compress performance, curve performance, concussion performance, lay cut performance, concussion cut performance ), making use of drainage method to calculate its average density, which is 1. 25kg / m3, and combustion method to calculate its content of macromolecule, which is 57. 7 %
利用多層復合技術和模壓技術制備來的人工顱骨復合材料，通過對其一系列性能測試（包括拉伸性能、壓縮性能、彎曲性能、沖擊韌性、層間剪切強度和沖擊剪切強度等） ，證明了該復合材料具有良好的物理機械性能。採用排水法計算復合材料的平均密度為1 . 25kg m ~ 3 ，採用灼燒法計算復合材料的含膠量為57 . 7 ，證明該復合材料比強度較高。This paper put forward a method of using amending sine value in the spwm sine table. this method can correct the distortion of the output voltage waveform, which resulted from the dead time used to the voltage type whole bridge main circuit. the inverter system adopts digital fuzzy controller with feed forward correction and which proportion coefficient and integral coefficient is changeable, so dynamic response is improved
本文提出了一種採用修補spwm正弦表值的方法，用以改善電壓型全橋逆變主電路因上下橋的功率器件切換時先關斷后導通的死區時間而引起的輸出電壓波形畸變；逆變系統採用帶前饋校正的變比例變積分系數的模糊控制器，提高了系統的動態響應指標；系統設計了完善的保護措施，並具有市電電網的故障診斷功能。( 3 ) based on the analyses results of simple inference method and seismic focal mechanism and on the statistic results of measured geostress data, the direction of principal stress was derived and based on the analyses results of macro geological estimate and on the statistic results of measured geostress data the magnitude of principal stress was derived too. the influence of rapidly down - cutting of yellow river on geostress field of studied zone was discussed. then the evolution of geostress field accompanying with the down cutting of yellow river and was simulated with fem and the spatial distribution features of geostress were discussed
根據簡易推斷法、地震震源機制分析法以及地應力實測資料統計分析結果，綜合確定了工程區的主壓應力方向；運用地質宏觀判斷法並結合地應力實測資料的統計分析結果對地應力的量級進行了綜合評價，並進一步討論了黃河快速下切對研究區地應力場的影響；運用有限元法模擬了研究區地應力場的形成過程，並探討了地應力的空間分佈規律。Although the law of land contract, promulgated lately by the government, is likely to prevent further distribution of rural land in the eye of the law, peasants ' opportunism motivation of continuous land distribution is not easy to put an end, on the ultimate pressure of the contradiction of population growth and land reduction due to the vague property of rural collective land, and some illegal administrative adjustment of rural contracted land by township or village for the purpose of most peasants are inevitable constantly
《農村土地承包法》雖然從法律上切斷了農地繼續細分的制度路徑依賴，但是，由於農村集體土地產權模糊，在人地矛盾日益緊張的壓力下，今後很難阻止農民繼續要求平分集體土地的機會主義動機；而農村基層政權組織為了滿足多數農民的強烈願望違法調整農村承包地的行政行為也會經常性發生。Firstly, this paper introduces the asynchronous motor model, and compares it with the dc motor ’ s. then the paper studies the principle of vector control, and proposes an improved current model of rotor flux observer. this paper also studies the three - level inverter ’ s topology, working principle, the neutral - potential unbalance mechanism and its controlling strategy. the paper especially studies the svpwm in details. the interface between the vector control and the three - level inverter is studied in details, including the generation of reference voltage vector, its judging of the sector and triangular regions, and the working mechanism after it sent into three - level inverter. when synthesizing the reference voltage vector, select the vector which only includes p and o states as the starting vector, thus eliminate the vector shift problem when sector changes. this paper fully takes advantages of the powerful functions of matlab / simulink to set up the simulation model. this construction is very explicit. the simulation results verify the inverter voltage output is correct, the rotor flux is steady, the asynchronous motor ’ s dynamic and steady state performances and speed modulation are excellent
本文首先介紹了異步電機的數學模型，在此基礎上將異步電機的數學模型與直流電機的數學模型進行了比較;然後介紹了矢量控制的基本原理，採用了一種改進的轉子磁鏈電流型觀測模型;對三電平逆變器的電路拓撲、工作原理、中點電位不平衡的機理及控制方法進行了介紹，詳細分析了空間矢量脈寬調制策略。本文對異步電機的矢量控制與三電平逆變器之間的介面進行了詳細的研究，包括:參考電壓矢量的形成、所落扇區與具體小三角形區域的判斷、送入逆變器之後的工作機理。在參考電壓矢量的合成時，選擇只包含p 、 o狀態的空間電壓矢量作為起始矢量，解決了扇區切換時的矢量突變問題。Aerospace series - collars, flanged swage locking, sheartype, in titanium ti - p99002, metric series
航天航空系列. ti - p99002型鈦合金米制系列法蘭連接模壓鎖緊切變型墊圈The module will itself react if a dangerous situation should occur, which including under - voltage, over - voltage, over - current and short - circuit. it can block the operation of the battery and stop work, even completely shut down the working circuit to protect the battery. in the module we design the liquid crystal display to show the characters and the running state of the battery
電池運行狀態監控模塊關注于電池的電壓、電流和溫度的採集以及soc等參數的計算方法;利用總線方式使電池能夠與智能充電器和主機通訊;模塊內部設計了電池保護電路，當電池在使用過程中出現過壓、欠壓、過流和短路時，對電池進行控制使其停止工作甚至切斷工作迴路達到對電池的保護作用;為了更直觀的了解電池當前的運行狀態，還為模塊設計了液晶顯示屏來實時顯示電池當前的運行狀態。This paper introduces the principle and method of forced - air cooling system of transformer controlled by dsp, according to the season and load of transformer, the designed system can automatically accomplish frequency conversion and the cooling device ' s devotion by fuzzy - neural network controller
摘要介紹了以dsp作為核心控制器件的大型變壓器風冷控制系統的原理和實現方法，根據變壓器負荷、季節等變化，通過模糊神經網路調節器自動投切冷卻器組數以及是否進行變頻運行。The study shows that this control approach can overcome those shortages of the methods which are adopted to control voltage and reactive power in substation nowadays, it can hold the voltage level in the regular bound and maintain the balance of reactive power in substation to the greatest extent, and it have the ability to seek the best solution. adopting this methods, the switching times of loaded taps and capacitors can be decreased efficiently and advance the running life - span of the transformer and capacitors and improve the economy benefits. this control approach is a advanced way ii and it is worth to study more and utilize
利用模糊神經網路對較好地實現對變電站的電壓、無功自動控制，能克服了目前在變電站電壓無功控制中普遍運用的分區方法存在的不足之處，不但可保持變電站電壓在合格的范圍內，盡量維持無功功率平衡，而且具有較好的尋優能力，有效減少變壓器有載調壓開關的切換次數和電容器組的投切次數，提高了變壓器和電容器的運行壽命，提高了經濟效益，是一種值得進一步探索和運用的較為先進的方法。In order to realize automatic and intelligent control better ; and to enhance the effect of electric power system ' s reactive power compensation and the economy of power network ; and to minimizing the times of checking in or out capacitor banks makes reactive power adjustment optimum, fuzzy control technology and genetic algorithm for reactive power optimization are proposed. we also mention how to make voltage and reactive power control optimum in the integrated automatization system of substation
為了充分實現控制的自動化與智能化，進一步提高系統無功補償的效果和電網運行的經濟性，保證無功調節達到最佳的狀態而投切的電容器次數最少，還引入了模糊控制技術和遺傳演算法進行無功優化，探討了如何在變電站綜合自動化系統中實現電壓無功的最優控制。Two network analysis and operation algorithms for balanced radial distribution systems, called forward - backward sweeping method of power flow solution and real - time control of capacitors installed on distribution systems, are presented in this thesis. distribution networks have characteristics such as mesh network on planning and radial networks on operation. the radial topology of distribution networks has been fully exploited such that a systematic branch and node numbering scheme is utilized to achieve storage and computational economy
本文對配電網路中電壓的調整，就電容器投切控制問題進行了深入的研究，在前人研究成果的基礎上，針對配電網路結構特點，提出了採用前推回推法計算配電網路潮流，對配電網路就地補償電容器的控制採用模糊控制技術，對全局優化控制採用逐次線性規劃演算法。First, because pipelines are so complex that controlled object is high order, delay, coupling, nolinear and time - varing, it is difficult to realize closed loop control for it using valid mathematic model. to resolve this problem, the paper presents a fuzzy - pid control algorithm with self - adjusting regulation factor. second, if a moving motor supplied by inverter power is switched to be supplied by power supply, the impact of overload - voltage and overload - current appears
主要針對中、大容量供水系統中，由於供水管網鋪設復雜、彎管多、控制對象具有高階、滯后、耦合、非線性及參數時變的特點，難以利用有效的解析式數學模型進行閉環控制，以及多臺水泵並聯運行時，水泵電機由變頻電源供電向工頻電源供電切換過程中產生的過電壓過電流沖擊這兩個難題，提出了可調整因子fuzzy - pid控制演算法及利用鎖相環控制實現水泵電機由變頻電源向工頻電源的同頻同相平滑切換。分享友人