When an xfs filesystem is created , the underlying block device is split into eight or more equally - sized linear regions 當(dāng)創(chuàng)建xfs文件系統(tǒng)時,底層塊設(shè)備被分割成八個或更多個大小相等的線性區(qū)域( region ) 。
The comparison showed that : ( l ) farassat 1a formula is the simplest one and work well for the subsonic rotor . ( 2 ) both kirchhoff formula and k - fwh formula can predict the nonlinear noise generated by transonic rotor ; ( 3 ) when the surface is not positioned in the linear region , kirchhoff approach for rotating integration surface could lead to substantial error , but k - fwh formula can still work well 數(shù)值研究表明: farassat1a公式在預(yù)測線性噪聲方面簡單有效,適用于亞音速旋翼的噪聲預(yù)測; kirchhoff公式和k - fwh公式均能夠預(yù)測跨音速旋翼聲場,并且具有較高的精度;當(dāng)聲源面位于流動非線性時, kirchhoff公式會導(dǎo)致很大的計(jì)算誤差,而k - fwh公式不存在這樣的問題。
In the paper , prescale technology , interpolate method , averaging method and multiple period synchronization method are used to measure the frequency accurately . diode demodulating technology , and power attenuated method or probe coupling & water load technology are employed to measure the power of high power microwave . isothermal technology is used to improve the stability of demodulator and to expend the range of square linear region 本文采用預(yù)分頻法、內(nèi)插法、多周期同步法、平均法實(shí)現(xiàn)了頻率的精確測量;利用二極管檢波技術(shù),結(jié)合衰減法或探針耦合+水負(fù)載技術(shù)實(shí)現(xiàn)了大功率微波功率的測量;采用恒溫技術(shù)提高了二極管檢波器穩(wěn)定度;完成了單片機(jī)串口通信協(xié)議設(shè)計(jì)和系統(tǒng)電磁兼容的分析和設(shè)計(jì)。