Thus for non - coincident nodes , a special reference coordinate system is available termed a uniaxial reference coordinate system 因此,對于非一致性的節(jié)點,通常要使用單軸參考坐標系。
The defined unit cells have the brick shape which height is equal to the braiding pitch , and oriented in the same reference coordinate as the composites 該單胞模型為一六面體形狀,其取向平行于預制件的表面,且高為編織花節(jié)長。
The velocity of the grid cell boundary was added into the governing equations and no source term appeared because the reference coordinate system was the inertial one 流動計算采用慣性坐標系作為參考系,這樣控制方程沒有出現(xiàn)由坐標系旋轉帶來的源項。
At first , this article establishes the reference coordinate system and the moving axes , gives the system description method of the parallel robot under these two coordinate systems , and defines the structure parameter of the parallel robot 首先,本文建立參考坐標系和運動坐標系,給出并聯(lián)機器人在這兩個坐標系下的系統(tǒng)描述方法,并且定義了并聯(lián)機器人的結構參數(shù)。
The third part of the work concerns the main influencing factors of the system low frequency oscillation , the small signal mathematical model of the inverter induction motor is established in the stator reference coordinate , effects of the motor parameter on the system low frequency oscillation are researched . then , by the analysis of the inverter nonlinear working characteristic , the internal relationship between the inverter dead time and the low frequency oscillation is studied and clarified , and the effects on the system low frequency oscillation are taken into account , which are produced by the dead time and change of carrier wave frequency of the inverter 首先建立了固定于定子坐標系中pwm逆變器-異步電動機小信號模型的基礎,研究電機參數(shù)對系統(tǒng)低頻振蕩的影響;其次,通過逆變器非線性工作特性的分析,研究并揭示了逆變器死區(qū)時間與系統(tǒng)低頻振蕩的內在關系,考慮逆變器死區(qū)時間、載波頻率的變化對系統(tǒng)低頻振蕩的影響;最后總結出提高和改善系統(tǒng)穩(wěn)定運行的電機設計和逆變器v / f _ c曲線設置準則。