positive beam 中文意思是什麼
positive beam
解釋
帶正電子粒子束-
Oxidezed aluminum reflector in positive pole, which is designed for narrow & medium light beam
進口陽極氧化鋁反光器，眩光更小 -
( 3 ) it is known that load effect is not consistent with the section resistance incommon section continuous composite beam. a kind of composite beam with itsrational section size is suggested, which is consist of the t shape concrete beam andsteel girder. this kind of composite beam not only has enough carrying capacity, almost has same positive and negative resistance moment, but can decrease theamount of the steel
（ 3 ）分析可知連續組合梁的跨中、支座截面處荷載作用效應及截面抗力規律不匹配，本文提出了採用t形混凝土梁和工字鋼代替一般的混凝土板和工字鋼的組合梁截面形式，並給出了截面尺寸比例，能使正負截面抵抗矩接近，符合組合梁受力特徵，減少了材料用量，滿足承載力和剛度等要求。 -
Rigid - flexible coupling system ; rotating flexible beam ; active vibration control ; positive position feedback ; piezoelectric ceramic
剛柔耦合系統旋轉柔性梁振動主動控制位置正反饋壓電陶瓷 -
The proposed control system includes the attitude controller acting on the rigid hub, designed by using pulse - width pulse - frequency ( pwpf ) modulation integrated with command shaping technique based on csvs method, and the piezoelectric material elements as sensors / actuators bonded on the surface of the beam appendages, designed by the optimal positive position feedback ( oppf ) control technique, in which the selection of ppf gains is determined via introducing a cost function to be minimized by feedback gains which are subject to the stability criterion at the
設計的控制器僅利用輸出信息，從而避免設計撓性模態狀態觀測器以及引入狀態觀測器誤差;在此基礎上，採用分力合成方法設計命令成形控制器來抑制撓性附件的振動，設計的優化命令成形控制信號在理論上可以對系統的各階撓性模態完全抑制。但考慮到模型不確定性和外部擾動，在內迴路又設計了最優正位置反饋（ oppf ）補償器以增加撓性結構的阻尼，使撓性結構的振動能夠很快衰減。 -
Compared with the rigid - flexible coupling dynamic models that had been constructed in other published papers, comprehension about the equation of rotating flexible beam based on the method of small element is presented, and some fuzzy understanding are clarified. numerical simulations on the vibration control of rotating flexible beam with positive position feedback are carried out. more over, using piezoelectric ceramic as sensors and actuators, several experiments are performed, their results are shown and discussed
在綜合比較已有文獻所建立的剛體-柔性附件耦合系統動力學模型的基礎上，以微元法為根據提出對旋轉柔性梁運動方程中各項的理解，澄清了某些文獻中模糊的認識。利用位置正反饋控制律，對旋轉耦合系統中柔性梁的振動控制進行了數值模擬。 -
An existence theorem of twin positive solutions to a nonlinear elastic beam equation
非線性彈性梁方程的一個孿生正解的存在定理
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