Closed form solution to workspace of double - octahedron variable geometry truss robotic manipulators 二重八面體變幾何桁架機器人工作空間解析
The results show that appropriate combined variable geometries can improve the engine aerodynamic stability greatly 結果表明,恰當的組合變幾何調節可顯著的改善發動機的穩定工作范圍。
Building hardware , fittings for windows and door height windows - requirements and test methods - variable geometry stay hinges with or without a friction system 建筑五金窗戶和門上窗的裝置.要求和試驗方法.可變幾何形狀的固定鉸鏈
Building hardware , fittings for windows and door height windows - requirements and test methods - part 6 : variable geometry stay hinges with or without a friction system ; german version cen ts 13126 - 6 : 2004 窗和落地窗用建筑五金和配件.要求和試驗方法.第6部分
The equations of workspace boundary surfaces for double - octahedron variable geometry truss pmts are derived based on surface analysis method . the projection and section curve grapha of workspace boundary surfaces for double - octahe 推導出了zrps ztps型及m 3tps型并聯機床運動學分析的一階和二階影響系數矩陣,得到了其運動學模型。
These analy ' tical expressions are solved using homotopy cofitinuation algorithjns , all solotions of singularity configuration are obtained . a numerical exarnple of singularity configuration analysis for double - octahedron variable geometry truss pmts is given . , 以r 3tps型并聯機床為對象,提出了一種精度建模方法,該方法將精度建模的問題轉化對應的“虛擬機構”的運動分析問題。
But there are some problems in normal turbocharger , for example , the low speed engine torque is deficiency , the engine ca n ' t works with full capacity when in part load , the transient response remains slow , to improve all the above , the variable geometry turbocharger ( vgt ) comes out to be an effective way 由于常規渦輪增壓存在低速轉矩不足、部分負荷經濟性差和瞬態響應遲緩的問題,而采用可變幾何截面渦輪增壓是解決這些問題比較有效的方案。本文以vgt60增壓器和yn4100qbz柴油機為研究對象,開發了可變幾何截面增壓器電控系統硬件。
The projection and section curve graphs of workspace boundary surfaces for 6 - sps type pmts are drawn . results of analysis show that the theoretic workspace of 6 - sps trpe pmts is enveloped by 30 surface patchs . input and output ewtons of displacement analysis for double - octahedron variable geometry miss pmts are established , analytical expressions for determining singuledty configuration are derived 分別推導出了znys ztps型、 ips 3tps型和ipt ztps型并聯機床奇異倉形判別的解析表達式,得到了奇異曲面方程,并由邊界曲面分析方法得到了lps 3tps型和ipt ztps型并聯機床的工作空間,文中給出了以上混聯結構并聯機床奇異位形與工作空間分析的數值實例。
To meet the needs for wider surge margin of the turbofan engine , a new model was developed to predict the characteristics of the fan / high pressure compressor and turbine in this thesis . several ways , including , variable inlet guide vanes of the fan , variable guide vanes of the high pressure compressor , the variable inlet area ratio of the mixer and the nozzle areas , were presented to enlarge the surge margin of the turbofan engine . meanwhile , a method of combined variable geometries for optimizing controls of inlet guide vanes of the fan , guide vanes and the first two stators of high pressure compressor , area ratio of mixer and noz zle areas was established 為了滿足下一代作戰飛機對推進系統的性能和穩定性要求,本文建立了壓縮系統特性和渦輪特性的新模型,并分別采用改變渦扇發動機風扇進口導流葉片、壓氣機導流葉片和前兩級靜葉片、混合室進口處內、外涵面積比和尾噴管面積,研究了其對發動機性能和穩定性的影響,進而得出了渦扇發動機變幾何擴穩的方法,為發動機變幾何擴穩研究打下理論基礎。
By adjusting many variable geometry components of the engine , bypass ratio can be changed during large range ( the most 0 . 25 of military fighter ) . the high specific thrust characteristic of turbojet engine and the low specific fuel consumption characteristic of the turbofan engine can be realized during different flight phase by the usage of vce technology 變幾何變循環發動機是應用于第四代多用途戰斗機的理想動力裝置,通過多個部件幾何的調節在較大范圍內改變涵道比,能夠使發動機在不同航段分別實現渦噴發動機的高單位推力性能和渦扇發動機的低油耗性能。