numerical instability 中文意思是什麼

numerical instability 解釋
數值不穩定性
  • numerical : adj 數字的；數值的；用數字表示的。 （a） numerical order 號數。 a numerical statement 統計。 the ...
  • instability : n. 動搖性，不穩定性；不堅決，反復無常，三心二意。 the instability of human affairs 人事滄桑。
  1. Fem numerical analysis for instability combustion in a firebox

    燃燒腔不穩定燃燒的有限元數值分析
  2. Wet and dry numerical simulation tests for explosive cyclone over western pacific were performed. by contrast the results show that : tropopause and constant temperature surface were raised by latent heat release in upper level and disturbance trough was produced because air flow ascended and became cold. owing to this process adaption, inertial instability emergenced

    對氣旋強烈爆發的過程進行干濕對比數值模擬試驗，得出：潛熱釋放使對流層項和等溫面抬高，氣流在高層的上升冷卻形成擾動槽，其適應過程使高層出現慣性不穩定。
  3. The numerical example shows that if we use the correct guess integral, this method will give right answer. it has good performance for both p - version and hybrid stress fem. last, a hybrid stress finite element with second stress completion is presented, which keeps the virtue of normal hybrid finite element, especially good for incompressble material, because it can avoid the self lock of displacement and instability of stress results

    第一部分還首次提出了一個滿足二次應力完備的雜交應力單元，它的應力滿足二次應力完備，而且通過巧妙的應力插值函數，避免了一般雜交應力元的矩陣求逆過程，而通常這個求逆過程都是很耗時的，這個二次應力完備雜交元保持了一般雜交元的優點，對于不可壓縮問題具有較好的性能。
  4. The first diagnostic analyses show that the heavy rainfalls are produced together by vortex, shear line and upper and lower jets, meiyu front. the condition of high energy, saturation, potential instability is propitious to the form and maintenance of heavy rainfall. the result of numerical simulation by mm5 model shows that heavy. rainfall has close relation with meso - scale vortex pole and strong convection

    採用ncep全球譜模式和常規觀測資料對「 03 . 7 」江淮地區的兩次暴雨過程的影響系統及其可能機制進行了初步診斷分析，發現梅雨暴雨是受低槽、低渦、切變線、高、低空急流和梅雨鋒區共同影響造成的，該地區維持高能、飽和、潛在不穩定的環境，有利於暴雨的產生中尺度數值模式（ mm5 ）模擬結果表明梅雨暴雨與中尺度渦柱、強對流運動密切相關。
  5. Based on tree data structure, the cartesian grids about 2 - d and 3 - d configurations are generated using the surface - cutting procedure. in the course of grid generation, a two - step ray - casting algorithm to excluded cells inside the body and a cell - merging technique to avoid numerical instability are fully developed. after creating these surrounding grids, the cell - cutting algorithm is designed to perform geometry - based refinement of grids, and greatly improve the applicability and quality of grid generation

    採用物面切割，基於叉樹數據結構，發展了一種普遍適用於二維和三維外形的直角切割網格生成方法；構造兩步射線求交演算法，刪除外形內的固體網格，以及小網格合併演算法，確保網格質量和流場計算的穩定性；運用對任意網格的切割細分演算法，實現了針對幾何外形的自適應網格加密，使得網格生成更具普適性和靈活性。
  6. The numerical method to solve the equation for spatial amplification theory is described in detail. deduced first - order system equations from spatial instability theory and its eigenvalue problem are solved and neutral lines varied with mach numbers are given

    運用穩定性理論的空間放大理論，建立穩定性方程，得到一個六元一階方程組，然後求解該一階系統，計算並得到不同馬赫數下的中性穩定曲線，基於此得到不同馬赫數下流場的臨界失穩點和穩定區域。
  7. Finally, compared with the 2d result, the synthetic jet that 3d numerical simulated has a definite direction. the 3d result, however, has a much smaller fluctuation owing to the span - wise instability which created a breakup of coherent vertical structure into smaller scales, it therefore compares more favorably with the measured data in tests

    三、三維模擬結果顯示合成射流的方向性極佳，與二維模擬相比較，三維數值模擬的速度波動較二維模擬要小，旋渦的相干結構衰弱，這是因為三維模擬考慮了流動的橫向不穩定性，這更加接近實際情況。
  8. Measurement and characterization of surface texture is an important aspect of precision metrology. historically this has involved partitioning a profile into different wavelength regimes referred to as roughness, waviness and form followed by numerical quantization. parameters computed are then inspected for tolerance compliance to ensure a part performs its intended function. this approach is satisfactory when the specification has been carefully determined and the process is stable. however, when the manufacturing process is under development or when instability or modifications to the process invalidate specifications, there is a need to study surface finish parameters in relation to functional performance or process measures. in this context, the problem of surface texture classification and recognition are discussed. advanced techniques developed for this purpose along with applications are presented. also, the techniques discussed here will be useful across large bandwidth, from the characterization of nano scale to traditional micro scale surfaces

    表面結構的測量與特徵描述是精密計量技術的一個重要方面，傳統上包括將輪廓情況根據不同的波長范圍劃分為粗糙度、波紋度和形狀及后續的數字量化.按算得的參數檢查它是否為公差允許，以保證零件執行其指定的功能.當技術特性已經經過仔細確定，並且其過程穩定時，該方法是令人滿意的;但是，當製造過程正在進行中或過程的不穩定、過程變化使技術特性失效時，就需要研究和功能表現及過程評定相關的表面參數.討論了表面結構的分類與識別問題.同時闡述了為此目的而開發的先進技術及其應用.所研究的技術對從納米尺度到傳統的微米尺度的較大帶寬范圍內的表面特徵描述都是有效的
  9. Abstract : the stability of the nonlinear comput ation is important in numerical weather prediction. in this paper, the concept, phe n omena and mechanism of nonlinear computational instability of the nonlinear evol ution equations in numerical weather prediction are discussed. an effective schem e, the square conservation shceme, is presented

    文摘:簡述了數值天氣預報問題中非線性發展方程的非線性計算不穩定性的含義、數值計算現象以及計算不穩定產生的機理，給出了克服非線性計算不穩定的一個有效方法? ?平方守恆格式。
  10. The condition of high energy, saturation, potential instability benefits for the form and maintenance of this rainfall. the mesoscale numerical model mm5 ( v3 ) is used to simulate the heavy rain process

    採用ncep全球譜模式資料，利用中尺度數值模式mm5 （ v3 ）對2003年7月4 - 5日發生在江淮地區的一次梅雨鋒暴雨過程進行數值模擬。
  11. The 3d simulation result shows characteristics as well as creating, developing and dissipation process of the microjet. the results show good agreement with experimental results. the numerical study reveals the spanwise instability of vortex pairs, resulting in the breakdown of the coherent vortex structure

    三維微射流流場的數值模擬再現了實驗所觀察到的旋渦對的生成、發展及其相干性的消失過程；揭示了旋渦對沿展向的不穩定性是旋渦對相干性消失的主要原因。
  12. The numerical experiments show that when nondimension parameter 0. 35 < 0. 65, the phenomenon of subcritical instability can exist in two - layer baroclinic atmosphere. the occurrence of subcritical instability is relative to the latitudinal gradient of coriolis parameter

    試驗結果表明：當無量綱量0 . 35 0 . 65時，斜壓兩層大氣中可能發生亞臨界不穩定現象。
  13. We discuss the phase instability of the system with the grand potential functional and find only gas - liquid phase transition happens and the demixing phase transition does not happen. after numerical calculation we want to draw the phase transition line, but failed in low density because of the divergence in calculation

    利用用巨勢泛函展開的方法我們對系統進行了相不穩定分析，發現在我們所討論的離子液體系統中只會有氣?液凝結相變發生，而不會有分層相f碩士學住論文物malaster 』 stm 「變發生。
  14. The finite element numerical simulation analysis is an important method to predict sheet metal instability in the sheet metal forming process. and the current general - purpose finite element codes all choose the strain - based forming limit diagram as the instability criterion, which has the limitation of correlative to the strain path. thus it is very inconvenient to study sheet metal forming under complex strain paths

    有限元模擬是板料成形過程中預測板料失穩的重要手段，考慮到當前通用的有限元軟體都是以存在應變路徑相關性缺陷的基於應變的成形極限圖為失穩判據，以致在研究復雜應變路徑板成形時極為不便。
  15. First using analytical method, we obtained the nonlinear baroclinic subcritical instability criterion and symmetric subcritical instability criterion. second using numerical experiments, we analyzed the influenced fact on the baroclinic subcritical instability, and we also analyzed what the nonlinear subcritical symmetric instability effects on a rainstorm, and advanced a new mechanism produced the rainstorm

    本文利用解析方法導得了大氣中非線性斜壓亞臨界穩定性判據和對稱亞臨界穩定性判據；並分別用數值試驗方法分析了斜壓亞臨界不穩定的影響因素以及亞臨界對稱不穩定在一場暴雨過程中所起的作用，提出了產生暴雨的新的物理機制。
  16. Then the unified approach can be applied to it to acquire the ensemble random evolutionary response. since the normal probability density function ( pdf ) may lead to instability of some sample systems when the random parameters taking sufficiently small negative values, an arch - like pdf and a more adaptable - pdf, together with the matching chebyshev polynomial approximation and gegenbauer polynomial approximation, are suggested. numerical examples show that the suggested methods are effective

    相比較而言，隨機模擬法的結果無疑是最可靠的，但是它的計算量嫌大；隨機攝動法的計算量遠小於隨機模擬法，但是它要求隨機攝動量必須是一個小量；正交展開法的計算精度好於隨機攝動法，其得到結果與隨機模擬法得到的結果幾乎吻合，其計算量略多於隨機攝動法，但與隨機模擬法相比要少的多，不過計算前的準備工作較費時。
  17. Flexible object simulation systems are mainly based on geometrical, physical and hybrid techniques. since adopting physical technique can not only embody the appearance but also analyze the internal structure of flexible object and obtain satisfying results, so the algorithm proposed here depends on this technique. the bottle - neck in most flexible object simulation systems is that time steps must be small to avoid numerical instability and the huge computation cost

    柔體的模擬方法主要以幾何技術、物理技術和混合技術為基礎，由於物理技術不僅能反映柔體的外部特徵，而且能對其內部結構進行深入的分析，所以在本文進一步研究的過程中，以該技術為主要的研究手段。
  18. Numerical study for the resonant triad interaction and secondary instability in a two - dimensional supersonic boundary layer

    二維超音速邊界層中三波共振和二次失穩機制的數值模擬研究
  19. Furthermore, numerical algorithms used to solve the linear system are introduced. next, after briefly discussing several causes of the late - time instability of the tdie solvers, a novel viewpoint about the instability is proposed. the marching - on - in - time algorithm ( mot ) is described and some temporal bases are discussed

    其次，在簡要分析了引起時域積分方程（ tdie ）時間步進演算法求解的后時不穩定性問題的幾個原因后，指出引起時域積分方程時間步進演算法的后時不穩定性的主要原因是離散tdie時採用了不精確的數值計算方法和不恰當的近似。
  20. Through static and dynamic numerical analyses of geometrically symmetric and asymmetric 3pbs, the conclusion is drawn : asymmetrical dynamic stress - strain field causes the crack expanding instability of geometrically asymmetric sample but not static condition

    ?通過以上幾何對稱及非對稱3pbs模型的靜態、動態數值分析，得出結論：幾何非對稱試件裂紋後期擴展的不穩定性是由非對稱的動態應力應變場引起，與靜態條件無關。
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