以下为句子列表：
英文: 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 assemblie
中文: 为了更好地应用各种新钻具，建立了适用于对普通下部钻具、导向钻具、带偏心弯接头和柔性接头的下部钻具进行三维小挠度静力学分析的数学模型，包括(1)微分方程；(2)钻头、稳定器、弯角、变截面、切点和井壁的边界条件；(3)钻头的侧向力和钻头转角.给出了该模型的加权余量解.用该方法编写的软件应用效果良好.
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