水压致裂煤体分区渗流试验装置及教学实验方法设计

水力压裂技术是在煤层气勘探开发过程中提高煤层气产能的重要技术手段,了解水压致裂后煤层瓦斯在不同致裂分区中的渗流情况有助于产气预测。为满足行业特色教学的科教要求,提高学生工程实际创新能力,自主研制了水压致裂扰动煤岩体瓦斯渗流模拟装置,并设计了瓦斯分区渗流的串并联实验方案。根据水压致裂扰动煤岩体的裂隙分布特征,将致裂煤层分为强扰动区、弱扰动区和未扰动区,分别对应贯穿裂隙煤样、微裂隙煤样、完整煤样;通过串并联上述煤样腔体实现符合实际工况的水压致裂瓦斯横向和纵向渗流模拟试验,获得煤层在不同水力压裂参数、应力环境、赋存条件下的瓦斯抽采量,对指导实际工程具有重要意义。该装置的研发完善了深部煤层不同扰动区渗流模拟的实验教学和科研手段,为科研辅助教学提供了良好的平台。

电脱水器运行模式对脱水效果的影响

为提高某海上平台电脱水器脱水效果,开展调整电脱水器串并联运行模式实验,该实验结果证实了电脱水器在处理液量大致相同的情况下,串并联不同运行模式下对电脱水器脱水效果有较大的影响,探索出电脱水器的最佳运行模式,提出电脱水器脱水效果最优的方法。

Design and experimental study of the SPKM165, a five-axis serial-parallel kinematic milling machine

A five-axis serial-parallel kinematic milling machine, the SPKM 165, is introduced. This machine consists of a three-degree of-freedom parallel module and a two-degree-of-freedom serial table. The SPKM 165 is capable of five-face machining. A discussion of the inverse kinematics of the five-axis control is provided. A dimensional synthesis procedure is presented in terms of motion/force transmissibility. Finite-element analysis was used to evaluate the stiffness of a CAD model before the machine was manufactured. Kinematic calibration was implemented to improve the accuracy of the end effector. The results of a calibration experiment are presented. The stiffness of the developed machine was then measured. Milling experiments were conducted, and the test piece showed that the developed machine has satisfactory performance.