Influence of head motion on welding quality in titanium alloy linear friction welding;
钛合金线性摩擦焊机头跳动对焊接质量的影响
In order to drill hard formations effciently and economically, the identification and elimination of bit whirl motion become more and more important in drilling fields.
为了更有效和更经济地将ＰＤＣ钻头应用于坚硬地层的钻井，钻头涡动的识别及消除越来越受到人们的重视。