numerical precision 中文意思是什麼

numerical precision 解釋
數值精度
  • 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 ...
  • precision : n 精密,精確性;嚴格;精密度;【修辭學】精確。 arms of precision 裝有瞄準儀的槍炮。adj 精確的,精...
  1. 3. developed simply and practical fluid network algorithm for large - scale of pipe networks, such as air - gas system and powder manufacture system. iterative computation used in this algorithm is not only astringing quickly and numerical calculating steadily but also cater the required ratio of precision and guarantee the real - time and any performance simulation of fluid network

    3 、本文對風煙系統和制粉系統等大型管網,建立了簡單實用的流體網路模型演算法,此法在迭代計算中,不僅可以快速收斂和數值計算穩定,而且滿足一定的模擬精度,較好的保證了流體網路的全工況實時模擬。
  2. In contrast to traditional synchronous motor of electrical excitation, permanent - magnet synchronous motor ( pmsm ) has more advantages, especially the occasion that requires high precision of control and high reliability, such as avigation, numerical control machine tool, processing center, robot and so on. in addition, it plays an important part in ac motor in modem times

    與傳統的電勵磁同步電機相比,永磁同步電機具有許多優良的特性,尤其是在要求高控制精度和高可靠性的場合,如航空、數控機床、加工中心、機器人等方面獲得了廣泛的應用,在現代交流電機中也佔有舉足輕重的地位。
  3. The task selects the up to the minute mesoscale numerical model as our forecasting model and use thrice fixed nesting and terrain datum of down to dale ( highest precision data of 30s ) as our terrain datum in the endothecium

    本文選擇了當今最為先進的中尺度數值模式mm5v3作為數值預報模式,採用三層固定網格嵌套,選用其最新提供的30s高精度資料作為內層重點考察小區的地形資料。
  4. This three hybrid type pmts possess such advantages as : simple structure, good dexterity high machining precision, high machinillg speed, position decoupling wth orientation, easy nc programming et al, can meet the need of numerical colltrol machining for large pwts with complex wes

    這三種混聯結構並聯機床具有結構簡單、加工靈活、加工精度高、加工速度快、加工工藝性好、位置與姿態解耦和數控編程方便等優點,可以滿足大型具有復雜曲面類零件的多軸聯動數控加工的要求。
  5. Two numerical examples of simple component in two and three dimensions are analyzed respectively by using the formulated transition element. the calculated results show that the formulated transition element can realize the transition between elements with different mesh densities and the calculated stress has a higher precision, which suggests that the transition method using the formulated two dimensional and three dimensional transition element is feasible for the transition between different meshes of elements in the multi - scale damage modeling

    進行了相應的數值分析,應力計算結果表明:構造的過渡單元能夠實現疏密網格之間的單元過渡,應力計算性能良好,表明文中所提出的過渡單元的連接過渡方案是可行的,初步實現了結構跨尺度損傷模擬過程中所需要的疏密網格單元之間的過渡。
  6. The numerical simulation equations of the border curves in term of and as well as the matching rules and the frequency dependence of microwave electromagnetic parameters of a broad - band homogeneous absorbing coating with a finite value of reflection loss are available. these results pointed out the direction to develop rams ". according to the radar - absorbing model, the optimized design of rams with thin - layer, light - weight, broadband and strong - absorbing is available by the simple genetic algorithms, which can effectively conduct the research work of rams to the detail. small but completely, the electromagnetic parameter ' s databases of rams that based on actual microwave absorbers have been set up, the object function has been constructed which conform to the involved goals, the adaptive coding measure is taken which extends the coding length dynamically adapting to the condition of the number of actual absorbers or the precision of thickness and absorber - volume - percentage, the decoding technique is initiated which satisfies light - weight and strong - absorbing as well as thin - layer and broadband by adopting of tracing variable restricting conditions dynamically to control total thickness. when decoding, the variable restricting conditions of thickness are dynamically traced, so gain the radar absorbing coatings of light - weight multiple - layer single - ingredient. similary, of thickness and absorber - volume - percentage, of light - weight multiple - layer multiple - ingredient. also, the rams ' demand to radar - absorb performance as frequency is met making use of the penalty function

    作為遺傳演算法的具體實施:根據本實驗室近來研製的吸波材料,建立了吸波材料的相關數據庫;構造了能真實體現「薄、輕、寬、強」優化目標的目標函數;根據材料的實際數量以及塗層厚度精度要求、吸收劑體積分數精度要求,建立了能動態擴展相應碼長的自適應編碼方法;首創了通過動態跟蹤變量的約束條件來控制塗層總厚度的解碼技術,以此實現了在不弱化寬頻、高強的吸波性能目標的同時,兼顧到薄層、輕質的使用性能要求;在解碼時通過動態跟蹤厚度變量的約束條件,實現了多層單組分吸波塗層對重量輕的要求;通過動態跟蹤厚度變量的約束條件和吸收劑體積分數的約束條件,實現了多層多組分吸波塗層對重量輕的要求;使用權重系數變化法,實現了吸波塗層的分頻段吸波性能要求。
  7. Three - dimensional flow over flat wall is simulated by virtue of large eddy simulation. the subgrid model is germano dynamical model and the numerical difference scheme is center difference scheme of two - order precision. the outcomes can be validated by its experimental counterpart

    亞格子模型採用germano動力模型模擬,數值差分格式採用具有二階精度的中心差分格式對平壁流動進行三維大渦模擬,模擬結果通過與實驗結果的比較得到驗證。
  8. The theory analysis and numerical experiment indicate that the combined metamodel approach has some good characteristics such as high fitting precision, good prediction ability, insensitiveness for simulation data, etc

    理論分析和數值實驗表明,組合元模型方法具有擬合精度高,預測能力強,對模擬數據敏感性弱的特點。
  9. The structure of the modern woodwork, processing quality has proposed higher demand to the wood processing equipment, for instance : wooden tenon position public errand, hole of interval, modes in chinese operatic music of furniture must high many rows of drill is it realize to come very by precision, panel unloading to is it realize to come by accurate person who cuts out board, is it is it is it is it sharpen by accurate numerical control machining center is it realize to come to mill to process to pare to milling extremely high of imitating etc.

    現代建築裝飾及家具行業的發展與加工設備是休戚相關的。現代木製品的結構加工質量對木材加工設備提出了較高的要求,如:板式傢具的木榫孔間距的位置公差必須由精度很高的多排鉆來實現,板材下料是由精密裁板機來實現,仿型極高的銑削加工是由精密數控銑削加工中心來實現的。
  10. The concept of row ( column ) transposed matrix and row ( column ) symmetric matrix is given, their basic property is studied, and the formula for full rank factorization and orthogonal diagonal factorization of row ( column ) symmetric matrix are presented, which can reduce dramatically the amount of calculation and save the cpu time and memory without loss of any numerical precision

    摘要提出了行(列)轉置矩陣與行(列)對稱矩陣的概念,研究了其性質,給出了行(列)對稱矩陣的滿秩分解和正交時角分解公式,極大地減少了行(列)對稱矩陣的滿秩分解和正交對角分解的計算量與存儲量,且沒有降低數值精度。
  11. Taking natural frequency and mode as damage principle, damage detection is studied as optimal problem based on genetic algorithm, and damage indices, symmetry and precision in the damage detection is discussed. numerical simulation of the damage detection of offshore platforms using genetic algorithm proves the feasibility of genetic algorithm in damage detection of large structure ; program all the process of genetic algorithm in damage detection into damage detection system

    以實測的固有頻率和振型為診斷依據,將損傷診斷問題歸結為優化問題,採用遺傳演算法加以研究,以10單元固端梁的損傷診斷為基礎,討論了診斷中出現的損傷指標,損傷對稱性和變量精度等問題;將遺傳演算法的損傷診斷應用於海洋平臺,驗證了遺傳演算法用於大型結構損傷診斷的可能性;並用matlab將遺傳演算法應用於損傷診斷的全過程編製成損傷診斷系統。
  12. This paper introduces the simulation method and advanced computer technology combining with ship statics principle into cargo shipment of bulk grain carrier, and develops loading simulation system of the bulk grain carrier. and introduce the principle of system and method of implement particularly. this paper describes the relating high precision calculation algorithms of the stability, trim and strength calculation used by the loading software in detail, focuses on the algorithms of numerical value integral and curve difference and imitate algorithms

    另外,本文還引入模擬的方法,採用先進的計算機技術,結合船舶靜力學原理和散裝穀物船舶穩性校核的特殊要求,開發了散裝穀物船舶的裝載模擬系統,並詳細介紹了該系統的原理和實現方法,在計算方法上,採用了高精度的浮態、穩性、和強度的計算方法。
  13. This item successfully completed under scheduled. one hand, it breaks the customary practice of only using foreign numerical control system to equip with high precision machine, escapes the hard problem that it is difficult to self redevelop in limited time by using foreign numerical control system, and resolves the problems that it needs convenience in manipulation and high precision in grinding

    一方面,打破了「高精度機床的數控裝置只選用國外數控系統」的慣例,避開了選用國外數控系統在短時間內難以二次開發的難題,解決了噴油嘴中孔座面加工中高精度的加工技術要求問題和方便操作問題。
  14. Numerical results all indicate that the two axisymmetric finite elements exhibit better numerical precision, excellent performance at the nearly incompressible limit and distortions of the element geometry, and element performances are improved after optimization. the layout of this thesis is follows

    具體表現是:對畸變網格有很好的適應性;計算可靠,不發生poissonlocking現象;對雙線性等參元的粗網格精度有很好的改善。
  15. The impaction of numerical precision on the accuracy of simulated flow field is checked. curving level of throat wall arc mesh is compared to see the effect on flow loss

    並比較了數值精度對流場模擬精度的影響和喉道壁面網格的圓弧度處理對流動損失的影響。
  16. The results show that, when the number of grid in numerical region is fewer, the numerical precision in iso - volumetric grid is higher than that in iso - spacing grid

    結果表明,當網格節點數較少時,等體積網格比等距網格具有更高的計算精度。
  17. The astringency, error and stability of the numerical method are researched. zero matrix method, constant matrix method, and jacobian matrix method are constructed in order to improve numerical precision and efficiency. the steps for calculating matrix exponential function using pade approach method are given out

    研究了所提西安理工大學博士學位論文數值計算方法的誤差、穩定性、收斂性等數學性質,在計算精度和計算效率兩方面提出了一些改進措施,構造了零矩陣法、常數矩陣法、雅可比矩陣法等計算格式,給出了利川pade逼近計算矩陣指數函數的求解步驟。
  18. Due to the difference of material characters and mechanics performance between concrete structures and soils, it is necessary to pay great attention to model the interface element, simulate the soil behavior and the optimization of the finite elements to satisfy the numerical precision and the compatibility relation of the whole project

    由於結構與土的材料特性,受力性能等方面的差異,為了滿足有限元計算精度和效率的要求,合理的反映結構與土體之間的位移協調,需要在結構與土體之間設置恰當的接觸面單元,正確的模擬土的本構關系,並盡可能地簡化結構的數值模型。
  19. The precise integration method of differential equation was presented by using 2 algorithm, its numerical precision was also analyzed

    運用指數矩陣的2 ~ n類演算法,構造了微分方程的精細積分演算法,並分析了計算精度。
  20. Through the research in this thesis, following conclusion can be drew : on the condition of nearly incompressible limit, the n - s equations can be recovered by the lb method ' s models with 2 - order numerical precision ; computational efficiency in simulating flow fields can be improved effectively by perfection of the lb method ' s theory ; development of parallel computation can contribute to the simulation of large - scale flow field with complex geometry

    通過本文的研究,可得出如下結論: lb方法的模型在接近不可壓縮的條件下能夠以二階精度逼近n - s方程; lb方法理論的完善能夠有效地提高流場模擬的計算效率;并行計算的發展有利於lb方法模擬大尺度的復雜流場。
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