damping ratio 中文意思是什麼
damping ratio
解釋
衰減系數,阻尼比-
The method proposed in this thesis do well in solving the problems of multi - damping - ratio - spectra simulation. it is convenient to obtain the pareto optimal solution set of the multi - object question by using implicit parallel genetic algorithms and the method can meet the practical needs for simulating ground motions coinciding with multi - damping - ratio - spectra in seismic design. the crossing rate and variance rate are important parameters of genetic algorithms which affect the rate of convergence, the adapting rate of cross and variation in this paper can auto - adapt and according to stand or fall of current sample, it assures the sample approach to the pareto optimal solution set in fast convergent speed
較好地解決多阻尼比反應譜擬合問題；本文方法通過一次運行就能獲得一組具有集系特性的地震動，在擬合多阻尼比反應譜的人造地震波集系的模擬方面有傳統方法所不能比擬的優勢，產生的人造波或人造波集系可滿足工程抗震設計需要；在遺傳演算法中，交叉概率和變異概率是影響收斂速度的重要參數，本文採用的改進自適應交叉概率和變異概率，可以根據當前樣本的好壞程度來自動地選擇適當的交叉概率和變異概率，以保證演算法始終以較好的速度向pareto最優解集逼近。 -
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。 -
The records we used are mainly from three parts : strong ground motion data before 1992 ' s ; data from scec ( south california earthquake catalog ) ; nsmp ( national strong motion project ). after we developed the attenuation laws, we analysis the attenuation characteristics for the pga and sa with different damping ratio. here we mainly concentrate on the effect of the distance and the magnitude
在回歸出中小地震的衰減關系后，本文對峰值加速度（水平向與垂向） 、加速度反應譜（阻尼比分別為0 . 005 、 0 . 02 、 0 . 05 、 0 . 1 、 0 . 2 ）的衰減特性進行了分析，影響因素主要考慮了震級與距離這兩個方面。 -
Considering the similitude law for shaking table test, we study the test results and obtain some conclusions which are a ) generally, the silty soil in test box liquefies and the liquefied time has relation with the amplitude of acceleration, b ) when the intensity is on and above eight degree, the silty soil deposit will be liquefied dramatically, c ) the relationship of the pore water pressure is relevant to the cycle loading which represents when the cycle loading ranges from little to great, the relationship is represent as a concave curve, or else as a protruding curve and tends to stability. ( 3 ) based on the triaxial compression test and the resonant column test, some studies are made such as a ) the duncan - chang parameters of constitutive model, b ) the dynamic shear modulus ratio and c ) the damping ratio of the site soil deposits. in order to deal with the test data, a computer program is compiled
（ 2 ）利用小型振動臺進行了k _ 0固結狀態下粉土的振動液化模擬研究，通過分析正弦荷載作用下的試驗資料，驗證了粉土的孔隙水壓力增長模式的合理性；從微分方程推導了基於土體振動臺模型試驗的相似律，並從模型實體、孔壓時程曲線和相似律等方面做出了分析，得出了如下結論：在小型振動臺試驗中，模型箱中的粉土都發生了液化，液化的時刻和輸入加速度幅值有關，而對頻率的變化不太敏感；粉土在相當於8 9度地震烈度的加速度幅值作用下可能產生嚴重的液化；孔壓的增長曲線形狀與施加的荷載有關：當施加荷載為由小到大的形式時，曲線形狀為上凹的曲線；當施加荷載為等幅的正弦荷載或荷載幅值由大到小時，曲線形狀為上凸的曲線，且逐漸趨于穩定。 -
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。 -
The research results show that transducer partially debonding results in clear change of instantaneous frequencies, mode frequencies and damping ratio of the structures
研究結果表明，傳感器局部開膠對結構的瞬時頻率和模態頻率以及阻尼比均有明顯的影響。 -
Method based on component analysis ( peak value pick - up ) and global orthogonal polynomial subsection fitting to obtain system damping ratio, natural frequency and modal shapes is especially described
著重描述了分量分析法（峰值拾取法）和整體正交多項式分段擬合法提取系統固有頻率及其振型的方法。 -
Then a simplified computational modal of damping isolation systems is established for a platform structure, and the relationships between the parameters of isolation layer and structural damping ratio, including their vibration - suppressed effect on the whole structure and the relative displacement of isolation layer are studied, and the simulation analysis under several representative load case of random wave force and earthquake affairs is performed. under random wave force, using complex mode theories, non - classically damp problems considering the interaction between the structure and wave, lying in deepwater, are studied. and the resolution solution of structural response are achieved. the results of calculating and analysing show that adding damping isolation to a jacket is an effective way to reduce vibration for offshore platforms
針對某一典型平臺結構，建立了海洋平臺結構阻尼隔振體系簡化計算模型，進行了波浪荷載工況和地震工況的數值模擬，研究了隔振參數與結構阻尼比的關系以及它們對結構整體和隔振層層間相對位移的控制效果，運用復模態理論研究了位於較深水位的固定式導管架海洋平臺在隨機波浪力作用下考慮結構與波浪相互作用時運動方程中非經典阻尼的解耦問題，獲得了結構響應的解析解。 -
To reproduce the narrow - band response, based on the thought of kanamori etc., the damping ratio and natural period are modified. through this adjustment, the narrow - band response can be reproduced, but for some natural periods the adjustive damping ratio has become negative. the negative damping is strange and can not be explained by the equation of motion for sdof system
為了生成窄頻帶反應，本文根據kanamori等人的方法調整了計算時的阻尼比及自振周期，調整后的單邊差分方法能在共振區域生成很好的窄頻帶反應，但是對一些周期點的阻尼比調整成為了負值，這從系統的動力平衡方程是難以解釋的。 -
The dynamics behaviors of the flexible jeffcott rotor system supported by unsteady short dynamic bearing are investigated. based on nonlinear unsteady - state dynamic n - oil film force model described by three functions the local stability of the periodic solutions with the controlling parameters, rotational speed ratio, imbalance amount, damping ratio and viscidity, are predicted by using the floquet multiplier. it is found that the period doubling bifurcation is caused by a certain imbalance amount and the hopf bifurcation is created by the lost stability of the oil - film
研究了非穩態動載短軸承支撐的jeffcott柔性轉子系統的動力特性，基於可用三個函數表示動態油膜的非穩態非線性油膜力模型，將轉速比、不平衡量、阻尼比、粘度作為控制參數，利用floquet乘子預測周期解的局部穩定性，發現倍周期分叉是由一定量的不平衡引起的，而hopf分叉是由油膜失穩造成的。 -
4. based on energy equivalence and power equivalence method separately, the additional damping ratio formula of nonlinear viscous damper is derived and it ' s suggested power equivalence method is more suitable for nonlinear viscous damper. then the transforming equality between actual and spectra velocity of structure is derived, based on which, the additional damping ratio equation is revised
4 、分別採用能量等效方法和功率等效方法，推導了非線性粘滯阻尼器的附加阻尼比公式，指出功率等效法更適合於非線性阻尼器；推導了結構的實際速度和譜速度之間的轉換公式，基於該轉換公式修正了功率等效方法下的附加阻尼比計算公式。 -
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。 -
Considering effect of damping ratio and frequency ratio to vertical amplitude of block foundation under dynamic action, this paper adopts calculating mode of mass - spring - damper and mass - spring to make account and analysis on the assumption of damping ratio and frequency ratio, then provides the range of damping ratio and frequency ratio by using two modes to calculate vertical amplitude of block foundation under dynamic action
摘要考慮阻尼比和頻比對動力作用下塊體式基礎豎向振幅計算的影響，對質彈阻計算模式和質彈計算模式在設定的阻尼比和頻比下進行計算分析，提出了在採用2種模式動力作用下塊體式基礎豎向振幅計算時的阻尼比和頻比范圍。 -
The different altitude up to base plate and distance between suspension girder has been set up and it lead to different damping ratio. lots of experiment is done in order to find optimum altitude and distance of suspension girder
研究發現，不同懸柵設置高度，不同柵條間距時產生的消能效果不同，並對此用模型試驗進行了最佳懸柵高度及柵條間距的優化分析。 -
In the same model, damping energy of structure and its proportion of total energy are almost linearly increased with the increase of damping ratio, and hysteretic energy of structure and its proportion of total energy are accordingly decreased. for the same damping ratio, damping energy and hysteretic energy vary 15 % to 35 % to the input energy in different models
在同一模型中，結構的阻尼耗能及其在總耗能中所佔的比例隨著阻尼比的增大近似線性的增加，結構滯回耗能及其在總耗能中所佔的比例則相應減少；對于同一阻尼比，不同的計算模型中，阻尼耗能及滯回耗能所佔總輸入能的百分比中，相差的幅度可達15 35 。 -
With the aid of the method for determining damping ratio in structural dynamic experiment the so called stationarity index is used to estimate the gentleness of the peak ’ s slope
文中藉助結構動力試驗中阻尼比的確定方法，提出用平穩度指數來評價單峰點包線函數平緩程度。 -
The influences of soil structure, confining pressure and strain amplitude on dynamic properties of recently deposited soils of nanjing and its surrounding areas are discussed. furthermore, based on test results and theoretical analysis, the averaging curves, recommended values and envelopes of dynamic shear modulus ratio ggmax and damping ratio versus dynamic strain for recently deposited soils of nanjing and its surrounding areas are presented. by use of vibration triaxial apparatus, nanjing silty clay and fine sand interbedded strata and nanjing fine sand were tested and their test results are discussed
通過自振柱試驗，探討了土的結構性、有效圍壓和應變幅值大小對動荷載作用下南京及其鄰近地區新近沉積土的動剪切模量、阻尼比和應力?應變關系的影響；通過試驗和理論分析，給出了南京及其鄰近地區的粘土、淤泥質粉質粘土、粉質粘土、粉質粘土與粉砂互層土、粉土以及砂土等六類新近沉積土中典型土類的動剪切模量比和阻尼比隨剪應變幅值變化的平均曲線、包絡線和推薦值。 -
Based on qualitative analysis and comparison of several options for suppressing transverse vibration on deck type steel plate girder of railway bridge, conclusions are made as follows : with static reinforcing, the vibration amplitude can be suppressed to some extent, but quasi - resonance of the bridge can not be avoided, moreover, the construction is inconvenient and costly. with option of two bridge connection, the effectiveness of vibration suppression is clear ( the damping ratio approaches 50 % ) and it is fairly economic and easy, however, the quasi - resonance of the bridge can not be avoided either. with dynamic option ( mtmd option ), the quasi - resonance of the bridge can be effectively avoided ( the damping ratio is up to 51. 38 % as tested in field ), moreover, the construction cost is low, and the construction is simply and convenient
通過對目前抑制鐵路上承式鋼板梁橋橫向振動的幾種方案進行定性的分析和比較，認為：靜力加固方案可以使橋梁振幅有所減小，但不能避免準共振現象的發生，而且工程造價較高，施工也不方便；兩橋連接方案減振效果明顯（減振率近50 % ） ，比較經濟也比較方便，但同樣不能避免準共振現象的發生；動力減振方案（ mtmd抑振方案）可以有效的抑制橋梁的準共振現象（現場試驗中減振率達51 . 83 % ） ，而且工程造價較低，施工簡單、方便。 -
The main frequency - domain parameters, which are discussed here, include modal numbers, cross terms of force spectra, and cross terms of modals as well as damping ratio
參數分析的內容包括參振模態的數目、力譜交叉項、模態交叉項、結構阻尼比，並得到了一些有價值的結論。 -
The study shows that adequate modes are important to ensure the precision of computation, and different ways to deal with cross terms of force spectra and modals have a great effect on results, and the resonant responses are sensitive to the structural damping ratio
研究表明，選擇足夠數量的參振模態對保證計算精度非常重要，力譜交叉項、模態交叉項的不同處理方法對計算結果有較大影響，並且結構共振響應對結構阻尼很敏感。
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