drill change 中文意思是什麼
drill change
解釋
鉆距-
Along with the progress of drilling technology, many new types of bha such as steering motor assembly, dropping assembly with eccentric bend sub, dropping assembly with flexible connection are developed based on common building, dropping and holding assemblies. for using these bha, a new mathematical model is put forward for 3d static analysis of these types of bha under small deflection. and its weighted residual solution is given. the mathematical model includes ( 1 ) differential equations ; ( 2 ) boundary conditions at drill bit, stabilizer, bend angle, diameter change, tangential point and borehole wall ; ( 3 ) lateral forces and deflection angles of bit. the software based upon this method runs well
為了更好地應用各種新鉆具，建立了適用於對普通下部鉆具、導向鉆具、帶偏心彎接頭和柔性接頭的下部鉆具進行三維小撓度靜力學分析的數學模型，包括（ 1 ）微分方程； （ 2 ）鉆頭、穩定器、彎角、變截面、切點和井壁的邊界條件； （ 3 ）鉆頭的側向力和鉆頭轉角.給出了該模型的加權余量解.用該方法編寫的軟體應用效果良好 -
Extension rod of quick - change drill chuck. dimensions
快換鉆夾頭接桿.尺寸 -
In order to scientifically manage exploration data, three - dimensional database composed of rock mass quality indices is established under the geodetic reference frame. those indices are obtained from adits, drill holes and outcrops. to efficiently make use of exploration data, finite testing results are spread to the extent which they can control in term of the characters of gradual change of rock mass quality
利用實測資料，研究了單指標（節理間距、完整性系數、 5m洞段節理條數）劃分巖體質量等級的對應性，驗證了單指標（完整性系數k _ v 、節理間距d ）和雙指標（ k _ v d 1000 ）劃分巖體質量等級的一致性。
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