instability criterion 中文意思是什麼

instability criterion 解釋
不穩定性衡準
  • 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。
  • criterion : n. （pl. -ria） （評判等的）標準，準則。
  1. Second, we discuss the influence of environmental referance potential temperture and thermal wind on mesoscale symmetric instability. we find the expression of disturbance stream function and criterion of symmetric instability by analytical method and conclude that change caused by environmental referance potential temperture with height and thermal wind make critical richardson number and disturbance critical half - wave length of symmetric instability larger, that is to say, they benefit the occurance of symmetric instability. third, we study nonlinear perturbation analysis of mesoscale vertical circulation and evolution equation by means of f - plane. non - hydrostatic balance and filiter model

    第二，討論了環境位溫與熱成風因子對中尺度對稱不穩定的影響。運用解析的方法求出了擾動流函數的表達式和對稱不穩定的判據，發現環境參考位溫隨高度的變化與熱成風因子使得對稱不穩定臨界理查遜數及擾動的臨界半波長都變大，這有利於對稱不穩定的發生。第三，採用f平面、非靜力平衡、濾聲波模式，討論了中尺度垂直環流非線性攝動分析及演變方程。
  2. This thesis briefly analyzes some yield criteria and instability criteria to the sheet metal forming first. then according to the transformation rule from ultimate strain to ultimate stress, it establishes the mathematical calculation models of the forming limit stress diagram for the software development according to hill48 、 hill79 and hosford yield criterion irrespectively

    本文首先分析了板料成形的屈服準則和失穩準則，然後根據極限應變到極限應力的轉換關系，分別採用hill48屈服準則、 hill79屈服準則和hosford屈服準則，建立了用於軟體開發的成形極限應力圖的數學計算模型。
  3. First read in the calculation result file i. e. d3plot, then input the correlative material parameters and ultimate strain from experiments, and the developed software will produce the forming limit stress diagram used as sheet metal instability criterion and the stress contour of the part

    所開發的應用軟體，首先讀取dynaform的計算結果文件d3plot ，輸入材料的相關參數和試驗所得到的板料的極限應變，軟體即可生成用作板料失穩判據分析用的成形極限應力圖和零件的應力雲圖。
  4. According to the former mathematical calculation models, the applied software, which uses the forming limit stress diagram as its instability criterion, is developed based on the sheet metal forming finite element code dynaform using visual c + +

    根據以上所建立的數學計算模型，基於板成形專用有限元分析軟體dynaform的環境，用visualc + +開發了以成形極限應力圖作為判據的應用軟體。
  5. In view of the above reason, this thesis adopts the forming limit stress diagram as the instability criterion due to its independence of strain paths, which is acknowledged at home and abroad in the field of sheet metal forming, and develops the applied software for the special purpose finite element analysis code dynaform in order to provide it with a new instability criterion

    本文基於板成形專用有限元分析軟體dynaform ，以國內外板料成形領域認同的具有應變路徑獨立性優點的成形極限應力圖為判據進行了應用軟體的二次開發，以期為板成形有限元分析軟體提供一個新的失穩判據。
  6. Starting from a two - layer nonlinear quasi - geostrophic baroclinic vorticity equation containing ekman friction, a new generalized energy is proposed to act as lyapunov function and thus a new criterion of nonlinear baroclinic subcritical instability containing two inequalities is obtained

    從含ekman摩擦的二層非線性準地轉斜壓渦度方程出發，提出了一種新的廣義能量作為lyapunov函數，導出了非線性斜壓亞臨界穩定性判據。該判據含有兩個不等式： （ 1 ）
  7. The influence of strain gradient is taken into account in the constitutive relation of coal or rock, the instability criterion of coal pillar is given, the influence factors of rock burst in coal pillar are analyzed

    在煤巖體本構關系中考慮應變梯度的影響，得到了煤柱的失穩判據，進而分析了煤柱巖爆的影響因素。
  8. From a nonlinear equation with boussinesq similarity on the f plane including friction dissociation and using a new kind of general energy as lyapunov function, we got the nonlinear subcritical symmetric instability criterion which a new kind of symmetric stability criterions. the nonlinear subcritical symmetric instability indicates that the larger amplitude disturb may cause the its instability to increase and then excite the mesoscale rainstorm

    非線性亞臨界對稱不穩定判據是從含摩擦耗散的f平面上boussinesq近似下的非線性方程出發，以一種新的廣義能量作為lyapunov函數，導得的一種新的對稱穩定性判據，理論指出較大振幅的擾動可能出現非線性亞臨界對稱不穩定增長，從而激發中尺度暴雨擾動的生成。
  9. 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。
  10. 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。
  11. The former adds a strong restriction to the latter, thus denoting that the subcritical instability easily occurs for a finite - amplitude disturbance in the real atmosphere. the new criterion has greatly improved the previous results

    該判據表明，在實際大氣中對于有限振幅擾動容易產生斜壓亞臨界不穩定，它大大地改進了以前的結果。
  12. Based on the catastrophic characters of the whole strain energy in truss structural instability, the relationship between the whole strain energy and the stress rate in the link element was educed, and the stress rate criterion for judging the instability of truss structures was built up through analyzing the changing law of stress rate

    基於桿系結構發生動力失穩時的總應變能突變特徵，推導總應變能同桿單元應力變化率之間的關系，並分析應力變化率的變化規律，建立了判定系結構動力失穩的應力變化率準則。
  13. The results show that the stress rate criterion applies for the judgment of the truss structural instability, and the criterion is more effective and definite in the local instability

    結果表明，應力變化率準則可以有效判定桿系結構的動力失穩，並且在判定結構的局部失穩方面非常有效和明確。
  14. Its stability evaluation should be performed from the following aspects, i. e. the method of rock simulation, the co - action of the dam and abutment, the mechanism of abutment instability, and the criterion of instability

    闡述壩肩穩定評價中主要包括的4個方面內容：壩肩巖體的模擬方式，壩體和壩肩的聯合作用，失穩機理和失穩判據。
  15. The goal of analyzing the instability in complex sheet metal forming is reached using the forming limit stress diagram as criterion in this thesis. some different sheet metal forming parts are analyzed with the developed software, whose results show that the developed software is satisfying for technological analysis of sheet metal forming and the applied module attains the anticipated goal

    並用所開發的應用軟體成功地對板成形零件的有限元計算結果進行了分析，分析結果表明，用該軟體分析板成形零件的失穩情況的結果可以滿足板成形工藝分析要求，所開發的應用軟體模塊達到了預期目的。
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