low damping 中文意思是什麼
low damping
解釋
弱阻尼-
Based on the situation of demand exceeds supply in the market, the author would like to find out the constraints of the water chestnut development by use of pra ( participatory rural appraisal ) in a survey to carry out stakeholder analysis including the water chestnut farmers, government and processing companies. also, the author applied a tool of system theory to analyze the constraints of water chestnut plant production development. the results are as following : the study shows that a main factor that restricts the plant yield ( per unit yield ) and quality ( product quality ) of water chestnut is the low level of prevention and control of water chestnut culms damping - off ; a disease of the water chestnut
針對賀州市荸薺產業發展中的「銷大於產」的突出矛盾，筆者通過運用pra （參與式農村評估）方法，對荸薺種植區的農戶、政府機構、加工流通企業等進行了調查研究，並運用系統科學的方法對荸薺種植系統的不同組成因子的制約因素進行分析，得出研究結論如下：農戶對荸薺稈枯病害的綜合防治水平偏低，制約其荸薺種植的產量（單產）和質量（商品質量） 。 -
Based on extensive investigation of construction technique history of chinese ancient buildings, the structure method, structure developing history and seismic behavior of chinese ancient timber structure buildings are analyzed in several respects of the structural system and form. through a series of experiments on constituent parts of chinese ancient timber building structure, including the tests on the corbels and brackets called dougong subjected to low cyclic reversed loadings, the tests on the wooden frame using the tenon - mortise joints as connections of column and beam subjected to low cyclic reversed loadings, the tests on vibration isolation effect of friction and slippage between column footing and their socle base, and a series of shaking table tests on a chinese ancient timber structure palace building mode under artificial earthquake at serving conditions, destroyed conditions and reinforced conditions, many valuable results of structures such as moment - curvature hysteretic loops of dougong structure and tenon - mortise joints under low cyckc reversed loadings, the static function, the seismic performance, energy dissipation, vibration reduction, energy - loss mechanism, nechanicalmode and failure mode were studied. aplenty of valuable parameters of the structure system were obtained, such as the natural period of structure, vibration modes, damping ratio, factor of vibration isolation, oscillate amplitude of ineitial accebration, velocity and displacement, magnitude of slippage, and the mechanism of structure failure and collapse etc. based on these research, the complete analysis of ancient timber structure under earthquake were carried out in which including mechanism analysis method, calculating mode, strength analysis of members and joints, strengthening methods for serving damaged ancient timber structure buildings were also taken into account
依照宋代《營造法式》建造了抬梁式殿堂木結構構件及結構模型，對中國古代木結構中的典型構造如：柱腳在礎石頂面平擱簡支、柱架榫卯連接、柱高不越間之廣、側腳、生起、斗拱等的構造機理及結構功能進行了量化分析和實驗研究： （一）通過木柱石礎靜摩擦試驗，測定了柱腳與石礎古鏡面間的摩擦系數及摩擦力隨上部結構荷載變化的規律； （二）通過單柱承載力試驗，測定了古建築中木柱的受力變形特徵、破壞模式、及模型材料的變形模量、極限承載力、極限變形等參量； （三）通過柱架低周反復荷載試驗，測定了柱架的抗側移剛度、柱架恢復力特性及滯回曲線、榫卯張角剛度及其變化規律、柱架及榫卯的極限承載力和極限變形、及榫卯減振參數； （四）通過斗?低周反復荷載試驗和受壓試驗，測定了古建築木構件與木構件間摩擦系數，斗?抗側移剛度，斗?恢復力特性及滯回曲線，斗?抗壓極限承載力及受力變形規律； （五）通過抬梁式殿堂間架模型振動臺試驗，測定了殿堂木構架結構自振周期，地震反應振形、阻尼特性及阻尼比；按結構分層特點對柱腳、柱頭和斗?層上的屋蓋的地震反應採用多點同步測量，對柱根滑移、榫卯變形、斗?的變形、復位、耗能減振參數等進行了定量分析。 -
Research on measurement of low - frequency and microamplitude of vibration in active damping of platform
主動隔振平臺的低頻微振動測量研究 -
The experimental results further demonstrate that the combination of incompatibility polydimethylsiloxane and polyacrylate by co - vulcanization improves the both compatibility and broadens the low temperature and high temperature functional region. while in sin, to improve microphase structures and damping properties, the design to increase compatibility between two compositions and modulate crosslinking density as well as relative reaction rate of two compositions, is also effective
以上實驗結果表明，在復合橡膠阻尼材料中將聚硅氧烷與聚丙烯酸酯通過共混硫化相結合，改進了二者的相容性，拓寬了其阻尼功能區的低溫和高溫溫域；而在sin中通過改善組四川大學博士學位論文分間相容性，調節交聯密度控制其微相結構和兩種組分相對反應速度的快慢，進而控制材料阻尼性能的設計是行之有效的。 -
However, because of the particularity that is hydraulic jump, before jumping, when water ' s froude number is less than four point five, the damping ratio is so low that energy dissipator ' s lower river produce serious flushing, so much so that it may threaten energy dissipation structure ' s safty
然而，因為水躍本身又具有其特殊性，在躍前水流佛汝德數（ froudenumber ）小於4 . 5時，消能率很低，致使消能工下游產生嚴重的沖刷，甚至危及消能建築物本身的安全。 -
According to these theories we know the reason of the emergence of low frequency oscillation is lacking positive damping even appearing negative damping. this problem can be classified as dynamic stability
從而得出，電力系統低頻振蕩是由於系統正阻尼不足甚至產生負阻尼而引起的，可以將其歸類為動態穩定問題。 -
Through the deep study of f. d. demello dynamic model of electromechanical transition and synchronous generator theory, we proposed a new control strategy of excitation device that can eliminate the negative - damping phenomenon, which is directly against the cause of producing negative - damping represented as low frequency oscillation in the system
通過深入研究f . d . demello機電暫態的動力學模型以及同步發電機理論，針對系統產生負阻尼即低頻振蕩的原因，我們提出了一種新的可消除負阻尼現象的勵磁控制策略。 -
This paper argues that the new track, because of its low cost and damping function, will become a widely adopted tack to replace the traditional ballast tad, ballastless bed and the expensive floating slab structure
試圖以其廉價及有效減振的特色，取代碎石道床軌道、無碴軌道和昂貴的浮置板軌道結構。 -
Stay cable, which is one of the important components in cable - stayed bridges, is susceptible to environmental excitation because of its small weight, large flexible, low damping, then the various vibration is induced, such as vortex - induced vibration, wake galloping, rain vibration, buffeting as well as parametric - induced vibration etc. in this paper, the vibration property of stay cable has firstly been introduced
斜拉索是斜拉橋的重要承力構件，由於拉索自身的質量輕、柔度大、阻尼小，在外界激勵下，易發生各種振動，包括渦激振、尾流馳振、風雨振、抖振以及參數振動等。 -
Stay cables of the long - span cable - stayed bridges are susceptible to vibration under wind loading, or wind incorporated rain excitation, or deck motion due to high flexibility, relatively small mass and very low inherent damping, such as vortex shedding, wake galloping, parameter resonance and wind - rain induced vibration. large - amplitude vibration of cables may reduce the life of cables and threaten safe traffic, and has been considered today as one of the most critical problems for this type of bridge
大跨度斜拉橋拉索具有較小的質量和極低的阻尼，在風、風雨及橋面振動等外部激勵下極易發生振動，如渦激共振、尾流馳振、參數共振和風雨振等，拉索的大幅振動對拉索的使用壽命和橋梁安全運營構成極大威脅，它已成為大跨度斜拉橋急需解決的關鍵問題之一。 -
Shock absorber is an important part of the vehicle suspension system. as an essential damping part of chassis components, shock absorber is closely connected with the operation, security and comfortabieness of the vehicle. the outer performance of shock absorber shall be indicated by the indicator diagram and the speed characteristic. the double - tube hydraulic shock absorber critical velocity is very low and easy to make outer performance degradation
減振器在車輛懸架系統中發揮著重要的作用，作為汽車底盤的主要阻尼元件，它不僅影響到車輛的舒適性，還關繫到車輛的操縱性及安全性，其外特性由示功圖和速度特性表示；普通雙筒液壓減振器臨界速度較低，易發生外特性畸變，且低溫條件下更易發生畸變。 -
Against the status of large scale ultra low frequency air spring vibration isolation platform, which is low damping and poor performance of low frequency, and after analyzing the existing key damping system, a new type differential electromagnetic damping system ( emds ) is developed in this article in order to reduce the resonance peak of the platform effectively and improve the low frequency performance of the platform
本文針對大型超低頻空氣彈簧隔振平臺阻尼小、低頻隔振性能較差的現狀，在比較多種提供阻尼力的方法后，提出了用電磁力作為隔振平臺的阻尼力，並開發研製了差動式電磁阻尼器系統。該系統可以有效降低隔振平臺的諧振峰值，從而達到了提高隔振平臺低頻性能的目的。 -
Finally, application of adams in the simulation analysis of the electromagnet damping system is based on velocity feedback. the result of the simulation is indicated that : the vibration effect of low frequency and resonance peak is decreased with increment of damping ratio, and the high frequency performance is not affected
最後採用adams對電磁阻尼隔振系統進行了振動模擬分析，模擬結果表明，合理設置阻尼比，能夠有效抑制諧振峰值，大幅度提高低頻隔振效果，並且對隔振平臺諧振頻率和高頻性能影響很小。 -
As the demand of low weight and high strength for high damping alloys, the composition of aluminum alloys was determined as al - 20 % zn - 6 % si - 0. 4 % mg ( i. e. azsm ) by the orthogonal experiments. furthermore, effects of alloyed elements, the modifying agents and heat - treatment on microstructures, damping capacities and mechanical properties of the azsm alloy were studied. finally, the damping mechanism of the azsm alloy was proposed
根據對高阻尼合金輕質高強的要求，採用正交試驗法確定了具有良好阻尼性能的鋁合金的成分為al - 20 zn - 6 si - 0 . 4 mg （下稱azsm合金） ；探討了合金化、變質和不同熱處理工藝對azsm合金組織、阻尼性能和力學性能的影響；最後提出了azsm合金的室溫阻尼機制。 -
In view of at present on the solid bridge the high - damping rubber dampers use the press capability of high damping rubber, the material utilization ratio is low, in this paper, the high damping rubber shearing damper has been put forward. by way of shearing capability trial of the high damping rubber damper test objects, the effects of laws concerning frequencies, temperatures and layer ' s thickness on the behavior of the damper are obtained ; and one kind of simple and convenient design method of high damping rubber shearing damper has put forward. finally high - damping rubber shearing damper is in simple comparison with viscous shearing damper
鑒于目前實橋上高阻尼橡膠圈是利用的高阻尼橡膠的擠壓性能，材料利用率低，本文提出了剪切型的高阻尼橡膠減振器，通過高阻尼橡膠減振器試件剪切性能試驗，獲得了頻率、應變幅值，厚度等各種參數對高阻尼橡膠減振器試件的影響規律，並提出了一種簡便的高阻尼橡膠剪切型拉索減振器的設計方法，最後並與粘性剪切型阻尼器做了簡單比較。 -
Owing to many unique properties of their own such as light self - weight, large flexibility and low damping, suspension cables often suffer large displacements but small strains each under normal work conditions. cables are also sensitive to dynamic loading with low frequencies such as wind loading
懸索具有質量輕、柔性大、阻尼低等特點，在正常工作情況下多處于大位移、小應變的變形狀態，對低頻荷載如風荷載等十分敏感。 -
Important missing aspects are : turbulent flow, numerical discretization techniques specially the relevant and difficult topic of numerical treatment of advection and related numerical methods of solution, variable property fluids, boundary layers, stability, etc. rather, it focuses on more primitive and fundamental issues of numerical treatment of advective equation and proper formulation of initial boundary value ( ib vp ). numerical problems associated with advective dominated transport include spurious oscillation, numerical dispersion, peak clipping, and grid oriention. however, the key of numerical solution of three - dimensional advective problem is searching for a high - precision interpolating function, which can keep the computational stability and low damping
3 、針對三維純對流方程提出了實用的擬協調單元模式，並與線性插值模式和協調單元模式比較后表明，在物理量大梯度變化的情況下，線性插值模式會產生較大的數值阻尼，導致解的失真；協調單元模式具有極高的計算精度和良好的計算穩定性，還可較好地克服數值阻尼，但由於計及物理量的二階導數項，計算工作量大，邊界條件給定尚存在一定的困難；而擬協調單元模式不僅具有協調單元模式計算精度高的優點，還避免了物理量的二階導數項，可大大地減少計算工作量。 -
Since long - span lattice roof structures are generally with whole rigidity and it ’ s characteristic of light, flexible and low damping. with the development of economy and progress of science and technology, more and more long - span roofs have been built, which have individual characteristics in architecture and structure
空間網格屋蓋結構因具有整體剛度好、質量輕、柔性大、阻尼小等特點，隨著經濟的發展，各種外形獨特、結構形式新穎的大跨度網格屋蓋結構大量涌現。 -
Accordingly, the problem of dynamical, such as seismic response, wind induced vibration, coupled dynamical vibration between bridge and vehicle should not be ignored. especially, stay cable, which is one of the main components in cable - stayed cfst arch bridge, is susceptible to environment and traffic excitations because of its flexible, low damping small weight, then the significant vibration is induced. the accurate analysis of the dynamic characteristics of cable - stayed cfst arch bridge is very important for the design of this type bridge
大跨斜拉鋼管混凝土拱橋作為一種新型的組合結構橋梁，由於結合了斜拉橋和拱橋的優點，已經運用到實際工程中，但其理論研究才剛剛起步，大跨斜拉拱橋與大跨拱橋、斜拉橋一樣，是一種柔性結構，應該重視其動力問題，地震、風振、車振等動力問題是該類橋梁所無法迴避的，尤其是斜拉拱橋的主要承力構件之一的斜拉索，由於其大柔度、小質量和小阻尼等特點，極易發生振動，準確分析斜拉拱橋及斜拉索的動力特性是斜拉拱橋設計的重要工作之一。 -
Stay cable, which is one of the main components in cable - stayed bridges, is susceptible to environmental and traffic excitations because of its flexible, low damping, small weight, then the significant vibration is induced. the accurate analysis of both the static and dynamic is very import for the design of cables in cable - stayed bridges
斜拉索是斜拉橋的主要受力構件之一，由於其大柔度、小質量和小阻尼等特點，極易發生振動，準確分析斜拉索的靜、動力特性並進行振動控制是斜拉橋設計的重要工作之一。
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