instantaneous coefficient 中文意思是什麼

instantaneous coefficient 解釋
瞬時系數
  • instantaneous : adj 即刻的,瞬間的。 an instantaneous bomb 瞬發炸彈。 instantaneous death 即刻死去。 an instantan...
  • coefficient : adj. 共同作用的。n. 1. 共同作用;協同因素。2. 【數,物】系數,率;程度。
  1. The calculated drafts covers the whole possible ship draft in the large amplitude motion ; secondly, the research creates and solves the ship large amplitude motion equations. on the one hand, the actual calculation takes into account the coupling between the different motion modes, on the other hand, in the process of calculation of the ship hydrodynamic coefficient, it considers the influence of the nonlinear factor. the hydrodynamic coefficient used in the calculation of froude - krylov force, diffraction force and radiation force changes instantaneously following the draft, and the hydrostatic buoyancy is computed very accurately for the instantaneous immerse hull

    本文的研究分為二個部分:首先利用frank源匯法計算水動力系數,計算包括不同吃水時的附加質量和阻尼系數,吃水范圍涵蓋了船舶大幅度運動時所有可能的吃水;然後建立和求解船舶大幅度運動方程,在實際計算時一方面考慮了運動模態之間的耦合,另一方面在計算水動力時,考慮了非線性因素的影響。 froude - krylov力、輻射力、繞射力中的水動力系數隨吃水瞬時變化,靜浮力的計算精確到船體瞬時濕表面積,最後用四階龍格?庫塔方法在時域內求解船舶運動方程,並進行了載荷計算。
  2. With the development of automobile industry and road transportation , the traffic accidents happen every day in the world and become a serious society problem the vehicle collision accidents are over 2 / 3 times as much as all traffic accidents they cause a large amount of social infuence and serious economic loss therefore , it is urgent to study vehicle collision accidents comprehensively and systematically , and the research also is the academic foundation to analyze and deal with traffic accident it is difficult to authenticate car velocity after traffic accident to dig over locate witness is right way mechanics is avaid tool in this field it is important to establish math model and this is precondition to calculate vehicle velocity firstly on the basis of summarizing the research results , this paper deeply discusses the calculating model to analyze the instantaneous motion state in the vehicle collision, the interrelation among the every moving mechanics parameters in the every phase of the collision secondly , according to the collinear collision and two - dimension collision and the restitution coefficient , the paper estabishesthe post collision movement models it proves that these models are correct and valid thirdly , this paper try to research reconstruction of road traffic accident and put forward the method on it

    對交通事故的科學分析應是建立在正確的數學模型與計算機模擬技術基礎上的定量分析,其基本條件就是要有能正確描述事故過程中汽車狀態的數學模型,只有建立正確的數學模型,才能較準確地推定事故車輛的碰撞速度。所以建立正確地車輛碰撞模型和運動模型正是汽車事故再現的關鍵問題。本文首先在總結前人研究的基礎上,深入地研究汽車碰撞理論,分析了車對車碰撞作用瞬間狀態的計算模型及碰撞恢復系數與碰撞前、后速度的關系;其次,根據交通事故中最普遍的一維和二維碰撞的不同情況,採用恢復系數和滑動摩擦系數等概念,分別建立了碰撞后車輛動力學模型;第三,對汽車碰撞事故再現進行了初步研究,確定了車對車碰撞事故模擬計算和反推計算方法,並給出相應的模擬程序流程圖。
  3. Based on a cone - shaped compound heatshield, a series of research work has been done from the investigation of theoretical analyses of ablative and insulating principles and technical experiments. 1 based on the exploration of improving material performances, a feasible scheme of adding insulating functional layer is proposed ; 2 a simplified calculation method is proposed via establishing fea ( fmite element analysis ) and instantaneous heat transmission is calculated with the mentioned method ; 3 a practical engineering scheme is proposed through a series of experiments ; 4 the interface problems of the function layer are solved through co - curing method and successful samples are manufactured ; 5 in order to estimate properties, the heatshield was anatomized engineering applied possibility is explored on the analyses of performance evaluation by testing mechanical properties, coefficient of heat conductivity and doing dynamic ablative experiments, also, the comparison with that of the required materials is done

    本文以一錐形復合防熱套為研究對象,從燒蝕、隔熱機理的理論分析和工藝試驗兩方面,進行了一下研究工作: 1 、通過對提高材料及製品通過對提高材料及製品隔熱性能的多種途徑進行探討,提出了採用添加隔熱功能層,研究復合型大面積防熱套是理論有效、工藝可行的方案; 2 、通過建立有限元分析模型,對防熱套的燒蝕隔熱行為進行了理論分析,提出了簡化的隔熱計算方法,並用該方法對復合型防熱套的瞬態傳熱模型進行了分析計算; 3 、通過復合型防熱套的工藝探索試驗,提出了一種工程應用上切實可行的工藝方案。
  4. Through experimentation, we compare the heat performance of hhchp with that of a solar water heater of glass vacuum tube ( abbreviated as hgvt ). the heat performance of a solar water heater includes instantaneous efficiency, average heat efficiency and heat loss coefficient

    通過大量的實驗,對蜂窩熱管平板式太陽能熱水器和全玻璃真空管式太陽能熱水器的熱性能進行比較,包括瞬時效率、日平均效率、熱損系數等。
  5. Based on the investigation with several voltage control methods, such as venturini method, instantaneous double - voltage synthesis method and space vector modulation method ( svm ), three new control strategies are put forward. firstly, a time - varying modulation coefficient svm method is proposed to improve mc ' s anti - disturbance performance under the asymmetry input voltage. secondly, a 5 - state switching strategy is presented for mc controlled by the svm method, which reduces the commutation number and switching losses remarkably

    在分析了venturini控製法、瞬時雙電壓法、空間矢量法等電壓控制方法的基礎上,提出了在非對稱輸入條件下矩陣變換器空間矢量法的時變調制比改進控制策略,提高了變換器的抗干擾性能;對空間矢量法的開關策略進行了研究,提出了新型5狀態開關策略,在保證其他性能不受影響的條件下,減少了變換器的換流次數和開關損耗;提出了一種矩陣變換器單電壓合成的新方法,它不僅使得變換器的控制簡單,計算量減少,而且使得開關損耗達到最少。
  6. Based on the commonly used strip theory with the extension of taking into account the instantaneous variation of the wetted hull surface during the motion and its effects on the ship hydrodynamic characteristics, this dissertation mainly calculates the ship motions and loads in waves in time domain and elementarily investigates some nonlinear characteristic of ship motion and hydrodynamic coefficient. it is hoped that the research had an engineering value for the predication and evaluation of seakeeping performance in the concept ship design stage

    本文基於擴展的切片理論,計入船體運動時濕表面的變化及其對船體流體動力性能的影響,在時域內計算了船舶在波浪中的運動和載荷,並對船舶水動力系數及運動中的一些非線性因素進行了初步的探討,本文的研究對船舶設計階段的耐波性能評估具有工程實用價值。
  7. It researches three ways of characteristics extraction of signals including zero - center instantaneous feature, wavelet analysis feature and a feature set consisting of fractal dimension, l - z complexity degree, entropy and resemblance coefficient

    在特徵提取部分研究了信號的零中心瞬時特徵、小波分析特徵以及由分形、 l - z復雜度、熵和相像系數組成的特徵集。
  8. These are correlation characteristic parameter, fourier spectrum characteristic parameter, power spectrum characteristic parameter, time domain amplitude characteristic parameter, linear prediction coding coefficients, instantaneous characteristic parameter, absorb and decay coefficient, velocity characteristic parameter and wavelet packet transform characteristic parameter. the parameters contain the surface relatively wide, the prediction which is suitable for the goal of many kinds of seism needs

    分別為:自相關特徵參數、付立葉譜特徵參數、功率譜特徵參數、時域振幅特徵參數、線性預測編碼系數、瞬時特徵參數、吸收衰減系數、速度類特徵參數和小波包變換特徵參數,參數涵蓋面較寬,適用於多種地質目標的預測需要。
  9. ( 2 ) according to the willis ' s method of mechanism conversion, the speed ratio formula is deduced. the instantaneous speed ratio formula is deduced by differential coefficient, and the condition of preserving it is deduced

    ( 2 )用willis轉化機構法求出了活齒端面諧波齒輪傳動裝置的傳動比,並用微分的方法分析、求得了瞬時傳動比,得出了保證瞬時傳動比恆定的條件。
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