非周期轉動 的英文怎麼說
中文拼音 [fēizhōuqīzhuǎndòng]
非周期轉動
英文
aperiodic motion-
Many planets ( for example, ganymede, mercury, the earth, jupiter and saturn ) and stars ( for example, the sun ) possess intrinsic magnetic fields. the explanation for their existence and variation remains a great challenge to planetary scientists and astrophysicists. this article attempts to review some recent developments and difficulties in the study of magnetohydrodynamics for the electrically conducting fluid interiors of planets and stars. it is the fluid motions, usually driven by thermal convection, that generate and sustain magnetic fields through magnetohydrodynamic processes in planets and stars. in planets, the magnetohydrodynamic processes are strongly affected by the combined and inseparable effects of rotation, magnetic fields and spherical geometry. the key dynamics involves the interaction between the coriolis and lorentz forces. in the sun, it is the solar tachocline, a thin shear flow layer located at the base of the convection envelope, that plays an essential role in the solar magnetohydrodynamic processes which produce the 11 - year sunspot cycle. some results of a new nonlinear three - dimensional solar dynamo model are also presented
許多行星(如木衛三,水星,地球,木星和土星)和恆星(如太陽)具有內部磁場.對這些磁場的存在和變化的解釋對行星科學家和天體物理學家是一個巨大的挑戰.本文試圖總結行星和恆星的導電流體內部磁流體力學研究的新近發展和困難.一般由熱對流驅動的流動通過磁流體力學過程產生並維持在行星和恆星中的磁場.在行星中磁流體力學過程強烈地受到轉動,磁場和球幾何位型的綜合影響.其動力學的關鍵方面涉及科里奧利力和洛倫茲力間的相互作用.在太陽中其流線,即處于對流層的薄的剪切流層在太陽的磁流體力學過程中扮演了一個基本的角色,並由之產生了11年的太陽黑子周期.本文也給出了一個新的非線性三維太陽發電機模型In xenopus embryonic extracts camp concentration and pka activity also oscillations accompany with the cell cycle, low in mitosis and increased during m / g1 transition, keep high until next mitosis, and the mechanism concern with the cdc25 phosphorylation state and cyclin b concentration. mouse fertilized egg is the most simple and natural model for cell cycle that near to human, but little is know about pka on mpf also pka on mitosis
通過對非洲爪贍胚胎細胞周期的研究發現jka活性也隨細胞周期變化而波動,在m期出現時pka活性下降,而m間期轉換時pka活性達最大值,一直維持高值直到下一個m期出現,其對mpf活性調節與cdc25磷酸化狀態及周期素b表達有關。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。On the basis of brief reviewing the progress of the researches about the relative fields at home and abroad, the system of economic sustainable development of huangling county was qualitatively analyzed in the thesis according to the life - cycle theory of products and industries, the theory of export guiding and the theory of economic sustainable development. and the method of systematic dynamics was applied in programming and mockingly regulating the ec onomic sustainable development of huangling, the best model for the economic sustainable development of county regions was discussed. and pointed out that the key to realizing the economic sustainable development of county regions was to suitably adjust the industrial structure, to transform the single structure into the multiple - levels and diversified structure and then to realize the recreation and substitution of advantages by developing coal industry and some non - coal industries such as agriculture and tourism that possess the regional advantages
本論文在簡要回顧國內外相關領域研究進展的基礎上,依據產業和產品的生命周期理論、出口導向理論和經濟可持續發展理論,對黃陵縣域經濟可持續發展系統進行定性分析,並運用系統動力學方法對其進行規劃與模擬調控,探討了縣域經濟可持續發展的最優模式,指出實現縣域經濟可持續發展的關鍵是適時進行產業結構調整,由單一的結構向多元化、多層次轉變,通過發展煤炭產業和具有區域優勢的農業、旅遊等非煤產業實現優勢再造和優勢替代。In the third chapter, we will study the existence and uniqueness of the classical global solution and generalized global solution to the periodic boundary value problem and the cauchy problem for this kind of equation. in the second chapter, we study the following nonlinear wave equation of higher order : with the initial boundary value conditions or with where a1, a2, a3 > 0 are constants, ( s ), f ( s0, s1, s2 s3, s4 ) are given nonlin - ear functions, u0 ( x ) and, u1 ( x ) are given initial functions. for this purpose, by green ' s function of a boundary value problem for a fourth order ordinary differential equation we first reduce the problem ( 1 ) - ( 3 ) to an equivalent intergral equation, then making use of the contraction mapping principle we prove the existence and uniqueness of the local classical solution for the intergral equation
本文分三章,第一章為引言;第二章研究一類非線性高階波動方程的初邊值問題的整體古典解的存在性和唯一性,以及古典解的爆破;第三章研究此方程的周期邊界問題和cauchy問題的整體廣義解和整體古典解的存在性和唯一性,具體情況如下:在第二章中,我們研究一類非線性高階波動方程的如下初邊值問題:或或其中a _ 1 , a _ 2 , a _ 3 0為常數, ( s ) , ( s _ 0 , s _ 1 , s _ 2 , s _ 3 , s _ 4 , )為已知的非線性函數, u _ 0 ( x ) , u _ 1 , ( x )為已知的初始函數,為此,我們先用四階常微分方程邊值問題的green函數把上述問題轉化為等價的積分方程,然後利用壓縮映射原理證明此積分方程局部古典解的存在性和唯一性,又用解的延拓法證明上述問題整體古典解的存在性和唯一性,主要結果有:定理1設u _ 0 ( x ) , u _ 1 ( x ) c ~ 4 [ 0 , 1 ]且滿足邊界條件( 2 ) ,若以下條件滿足:其中a , b月0為常數, wThe results show that there exists such nonlinear dynamical phenomena as chaos ang quasi - period movement when the rotational speed, mass eccentric and a synthesizing parameter of the system change. from different point of view, the chaotical phenomenen induced by double period bifurcation is found. in this paper, the dynamical model of bearing - elastical rotor with a cross - section of crack is estabilished
結果表明,在這一非穩態油膜力模型下,在轉速、無量綱偏心及一包含諸多因素的綜合參數的變化過程中,在很大的范圍內,系統運動都會出現由不斷倍周期分岔導致的混沌現象和概周期運動。The linear periodic time - varying vibration system can be changed to a constant coefficient linear system by l tansformation
摘要線性周期時變齊次系統的狀態方程經李亞普諾夫變換后,周質系數線性時變振動系統轉化為一非齊次定常線性系統。It is constructed that radial impact and rubbing dynamics differential equations of the rotor system having the nonlinear rigidity on the unsteady and non - linear oil film. the bifurcation and chaos behavior of impact and rubbing fault rotor system caused by the parameters of nonlinear rigidity, rotor rotating speed, eccentric mass is analyzed, in the numerical value analysis method. the bifurcation diagrams, maximum lyapunov exponent diagrams, poincar maps, phase plane portraits, trajectories of journal center, time - history curve, amplitude spectra diagrams of the rotor motion are used
( 2 )建立了具有非線性剛度的轉子系統在非穩態非線性油膜力作用下的徑向碰摩動力學微分方程,並應用含高階余項的非線性動力方程的線性化數值法研究了此類系統響應的復雜動力學行為,利用轉子響應的分岔圖、最大lyapunov指數曲線、 poincar截面映射、時域波形、相軌線、軸心軌跡、幅值譜等圖形分析了系統響應的周期運動、擬周期運動、倍周期分岔、混沌等運動形式的轉化與演變過程,重點研究了非線性剛度、轉子轉速、偏心質量等系統參數對碰摩故障轉子系統的分岔和混沌行為的影響。The results suggest fraud companies have higher debt ratio and proportion of other receivable to current assets, slower short - term liquidity, have lower ratio of days " sales in receivables, adjusted operational cash flow per share and smaller equity ' s centralization extent than nonfraud companies have. beside non - fraud companies, fraud companies are easier to receive non - standard unqualified auditing opinion
實證結果顯示:舞弊公司與非舞弊公司相比有更高的負債比率、其他應收款占流動資產的比重,更差的短期償債能力,更低的應收賬款周轉率、調整后每股現金和股權集中度,也更容易被注冊會計師出具非標準無保留審計意見。In the latter, the non - linear dynamic stabilities of the single rotor system with a crack are researched. the non - linear differential equ ations have periodic coefficients. and using the stability theory of the periodic motion, it is discussed that the thickness of the disk, the position of the disk and the position of the crack have effects on the dynamic stabilities
首先簡單討論了含裂紋的單盤轉子系統的線性動力穩定性,並與相關的文獻作出比較,驗證了等效線彈簧模型的正確性和精確性;然後,討論了含裂紋的單盤轉子系統的非線性動力穩定性,得到了一組具有周期系數的非線性微分方程組,且利用周期運動的穩定性理論進行了求解,深入討論了盤的厚度,盤所處的位置和裂紋所處的位置對轉子系統動力穩定性的影響。The method of change partial differential equation into ordinary differential equation is classified, the bifurcation and chaos in nonlinear schrodinger system is detected and the effectiveness of controlling chaos of buckling beam with parametric perturbation method is studied in details. chapter 7 is the summary and conclusion of the dissertation
第六章總結歸納了將非線性偏微分方程轉化為常微分方程的變換法,研究了一維無界區域上非線性薛定諤方程的分岔和混沌性質,解析地研究了用參數周期擾動法控制屈曲梁的混沌運動的效果。The internal damping forces and the nonlinear elastic forces in the analytical form are deduced from the kelvin. voigt viscoelastic model. a smart method basing on the concept of period number is proposed for evaluating periodic solutions of the nonlinear system and determining the periodic. doubling bifurcation points
( 2 )建立了一個4dof單跨彈性轉子在非線性油膜力、非線性內阻力和非線性彈性力作用下的非線性動力學模型,提出了求周期解的數值計算方法,以及計算周期解周期數及分岔點的演算法。It is showed by the results that, the rotor has different dynamics with respect to present results obtained by other researchers while the rotor is subjected to internal damping, nonlinear oil film forces and nonlinear elastic forces simultaneously. with increase of the rotary speed the rotor, quasi. periodic movement caused by internal damping will occur
發現當轉子通過油膜失穩進入倍周期運動時,由於非線性內阻力作用,還會發生概周期分岔形式的二次分岔,產生約1 / 6倍工頻的低頻運動。Due to their large masses, their rotational periods are very regular. we can specify the periods of some pulsars up to more than ten decimal places. this allows us to study the small disturbances around the star
由於中子星非常沉重,所以它的自轉周期非常規律,有些中子星的脈沖周期可以準確至小數后十個位,因此,就算中子星出現輕微的異動,天文學家亦可以觀察得到。A project has been brought forward, which focuses on the combination of an oscillation equipment with double steel - rob and the photoelectric technology on non - contact measuring. with collective precision being analyzed, the paper also points out how to bring it into effect. secondly, the design of mechanism, hardware and software of photoelectric measuring system with a core of at89c51 single chip microcomputer is accomplished
首先進行了不規則外形剛體轉動慣量測量的理論探索,找出了剛體轉動慣量與振動固有周期的關系,提出了以雙鋼柱扭擺機構,結合光電非接觸檢測技術測量航彈極轉動慣量的方案,並進行了總體精度分析,提出實施手段;其次,完成了航彈極轉動慣量測量系統的機械設計、以at89c51單片機為核心的光電檢測系統的硬體及軟體的設計;最後,給出了實驗數據分析及結論。分享友人