Introducing the theory and application of boundary element method on the sound radiation, giving the process of solving vibration noise radiation problem using boundary element analysis software ; presenting the coupling theory and the combination analysis of finite element method and boundary element method, and doing relevant analysis based on close drum shell ; programming the noise data simulation program using the numerical calculation software, simulating the acoustic and pressure data of a key point in the transient response acoustic field of the close drum shell, realizing the audibility of the noise, using the virtual reality tools to simulate the vibration noise of the drum shell ; combining the finite element method and boundary element method to analyze the vibration noise radiation of some gear box, and completing the whole simulation process of the vibration noise of the gear box
綜合介紹了邊界元法在聲
輻射問題上的理論及應用;並給出了運用邊界元法分析軟體求解振動聲
輻射問題的過程。闡述了有限元法和邊界元法的耦合理論及組合分析方法,並以封閉鼓形薄殼為分析對象進行了相應的分析。利用
數字計算軟體編制了噪聲
數據模擬程序,並模擬了通過組合方法分析封閉鼓形薄殼瞬態響應聲場而獲得一關鍵點的聲壓
數據,實現聲音的可聽化,隨后通過虛擬現實工具實現了該情形下橢球殼振動噪聲的虛擬模擬。
Using the hulscher model of the formation of sand waves and sandbanks, under the ancient bathymetry, or under the modern bathymetry, the stokes number of the tidal flow and resistance parameter in the radial sandbanks satisfy the conditions for the formation of sandbanks. the research demonstrates that the dynamic flow conditions result in the development of tidal current sandbank. the radial sandbanks and it ' s asymmetrical distributions will still maintain in the future
應用hulscher沙波及沙脊增長模式,通過對該海域斯托克斯
數及底部阻力參
數的計算首次發現,南黃海
輻射沙脊群海域在概化古地形和現代
輻射狀沙脊群水下地形情況下,其斯托克斯
數及底部阻力參
數均滿足形成潮流沙脊的條件。
Abstract : this paper describes the classical mathematic model of bolometer, the effect of thermal isolation and noise on detector performance are also discussed
文摘:總結了非製冷測
輻射熱計的經典
數學模型,並分析了探測器熱絕緣結構和噪聲對性能的影響,指出了性能改進和優化的基本途徑。
Also, they were favor for further explanations and canalization. the results of solar heating rate and infrared cooling rate and the model output were displayed as data forms and curves in the paper
文中將加熱率和冷卻率的計算結果以及與之相關的模式計算結果(可見光波段的大氣
輻射收支和紅外波段的大氣
輻射收支)以
數據表和曲線圖的形式列出。
Methods. apparent glucose diffusivity measurements were performed on 10 axial and 10 radial af specimens from bovine coccygeal discs. the dependence of diffusivity on compression was determined using 3 levels of strain ( 0 %, 10 %, and 20 % )
方法:測量來自牛尾骨椎間盤纖維環10個軸的和10個
輻射的樣品來獲得葡萄糖近似擴散系
數。壓縮狀態下的擴散系
數決定於3個等級的拉伸( 0 % , 10 % ,和20 % ) 。
Heat transfer coefficient,comprising convective and radioactive components may strongly depend on the actual flow enthalpy and density.
由對流和
輻射兩部分組成的熱交換系
數極大地依賴于實際活動的焓和密度。
The residues may be correlated with the radiational input.
余差可以與
輻射輸入
數相關。
Radiation spectrums of relativistic charged particles in a dipolar magnetic field were studied numerically in detail by using the current density of moving charged particles in this paper
摘要從運動的荷電粒子產生的流密度出發,研究了在地球偶極磁場中運動的相對論性荷電粒子的
輻射能量譜,並對其進行
數值計算。
Characteristics of heat balance parameters of arctic ocean drifting ice and open sea are presented based on the profile - flux method and the data obtained by the first chinese national arctic research expedition during aug. 19 24, 1999
利用中國首次北極考察隊於1999年8月19日24日在北冰洋浮冰區獲得的大氣近地層垂直廓線和
輻射等資料,依據相似理論方法,對比分析了北冰洋無冰海面和冰面上熱平衡參
數的變化特徵。
2. dynamic meteorology : equations of motion ; geostrophic, ageostrophic and gradient winds ; thickness and thermal wind ; continuity equation ; stream function ; vorticity equation ; divergence equation ; omega equation ; rossby wave ; ekman layer ; numerical weather prediction
2 .動力氣象學:運動方程地轉風非地轉風及梯度風厚度及熱成風連續方程流函
數渦度方程
輻散方程奧米茄方程羅斯貝波埃克曼層
數值天氣預報。
It does not need much area, not any pollution, not consuming much electricity power, not need much cost. gshp combined floor radiation air - conditioning system possess high seasonal average cop value and great capacity of edaphic depositing heat energy, can ease up supplied water temperature fluctuating with the change of the outdoor air temperature
地源熱泵技術聯合地板輻射對房間進行冷暖聯供的形式,具有地源熱泵季節性平均性能系數高、土壤蓄熱能力強、能緩解空氣源熱泵存在的供冷供熱能力隨環境溫度波動大的矛盾等優點。