Wbs is always used to substantiate the bound of project , by which engendering the plan before optimizing it . a method of random simulation by computer is presented to optimize the plan 航空型號研制項目范圍管理采用的主要方法是wbs工作分解結(jié)構(gòu),進(jìn)而依據(jù)wbs形成計劃,再進(jìn)行計劃的優(yōu)化,本文提出了一種隨機(jī)模擬法優(yōu)化計劃的方法。
The damage capacity is estimated by test data . the randomness of materials and earthquake are considered during process of analysis . influences of dead load on the structural reliability were considered too 采用montecarlo隨機(jī)模擬法,分別分析了只考慮地震作用隨機(jī)性以及同時考慮材料強(qiáng)度和地震作用的隨機(jī)性時對結(jié)構(gòu)的失效概率的影響,表明了材料強(qiáng)度的隨機(jī)性對結(jié)構(gòu)總體失效概率有一定的影響。
Suggestion the design reliability index of high - speed railway cwr dynamic stability to be settled 4 . 2 by quoting a renewal process model and first - passage failure criterion , the analysis method of cwr dynamic stability in design reference period is proposed . the reliability of high - speed railway cwr dynamic stability is analyzed . its result is compared with quasi - static analysis method and random simulation analysis method 基于反應(yīng)更新過程模型和隨機(jī)過程跨越理論,提出了無縫線路穩(wěn)定性動力可靠度的分析方法,分析了高速鐵路無縫線路穩(wěn)定性動力可靠度,并與隨機(jī)模擬法、擬靜力法的計算結(jié)果進(jìn)行了對比分析。
Its main contributions include the following several aspects : firstly , the dissertation constructs the mathematic model of short baseline orientation determination using two geostationary satellites and analyses the applicable conditions of carrier phase interferometry . orientation determination precision is analysed in depth through both the conventional linearized method and monte - carlo computer simulation method , and the mathematical simulation results show that the linearized method has the shortcoming of fairly low elevation error analysis precision in high latitude area so as not to be very appropriate there . by analyzing the definite factors influencing orientation precision , the dissertation develops the concept of orientation dilution of precision , which uncovers the internal cause of exotic error behavior of bi - satellite orientation , and has important guiding significance for practical engineering applications 本文系統(tǒng)地研究了基于“北斗一號”衛(wèi)星載波相位干涉測量原理實現(xiàn)地球靜止雙星定向的相關(guān)技術(shù),主要研究成果包括以下幾方面:首先,建立了利用兩顆地球靜止軌道衛(wèi)星進(jìn)行短基線定向的數(shù)學(xué)模型,分析了載波相位干涉測量的適用條件;采用傳統(tǒng)的線性化解析法及蒙特卡洛隨機(jī)模擬法兩種途徑對雙星定向的精度進(jìn)行了詳細(xì)分析,數(shù)學(xué)仿真結(jié)果表明在高緯度地區(qū)線性化解析法由于俯仰角誤差分析精度略有下降而不太適合;在分析定向精度確定性影響因素的基礎(chǔ)上,提出了雙星定向精度衰減因子odop的概念,揭示了雙星定向誤差特殊表現(xiàn)的內(nèi)部機(jī)理,對實際工程應(yīng)用具有重要的指導(dǎo)意義。
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(jī)模擬法的結(jié)果無疑是最可靠的,但是它的計算量嫌大;隨機(jī)攝動法的計算量遠(yuǎn)小于隨機(jī)模擬法,但是它要求隨機(jī)攝動量必須是一個小量;正交展開法的計算精度好于隨機(jī)攝動法,其得到結(jié)果與隨機(jī)模擬法得到的結(jié)果幾乎吻合,其計算量略多于隨機(jī)攝動法,但與隨機(jī)模擬法相比要少的多,不過計算前的準(zhǔn)備工作較費時。
隨機(jī): random stochastic; random模擬: imitate; copy法: law計算機(jī)模擬法: computer representation隨機(jī)模擬: stochastic modeling; stochastic simulation模擬法: analog approach; analog method; analogue method; analogy method; analogy process; api recommened method; method of simulation; simulated approach; simulatiom; simulation method; simulation technique隨機(jī)模擬信號分析程序: random analog signal analysis program隨機(jī)模: stochastic model; stochasticmodeling電模擬法: electric analog method; electric analogy method; electrical analog method; electrical analogy method動態(tài)模擬法: dynamic simulation method仿真法, 模擬法: simulation method故障模擬法: method of fault simulation化學(xué)模擬法: chemical simulation靜電模擬法: method of electrostatic analogy擴(kuò)散模擬法: method of diffusion analogy密度模擬法: density analog method模擬法測圖: analog photogrammetric plotting; analogue method of photogrammetric mapping模擬法求解: analogue approach模擬法庭: mock trial room; moot court模擬法研究: analog study實例模擬法: analogy with case examples實驗?zāi)M法: experiment analogue; experimental analogy method; experimental-analogic method網(wǎng)絡(luò)模擬法: network analogue method現(xiàn)場模擬法: simulated in situ method演繹模擬法: deductive simulator method; deductivesimulatormethod