Study on viscoelastic performance of asphalt mixture based on CAM model

In order to study the viscoelastic characteristics of asphalt mixtures in the whole-frequency range, a dynamic shearing rheometer is used to carry out dynamic frequency sweeps for asphalt mixtures, which obtains the three-dimensional relationships among G^＊, temperature and frequency. Then the time-temperature shift principle is used to translate the relationships from three dimensions to two dimensions, so master curves are obtained regarding dynamic modules changing along with the frequency over 15 amount levels. The Christensen- Anderson-Marasteanu （CAM） model, a kind of the rheological model, is used to analyze and compare rheological performances of several asphalt mixtures based on the obtained master curves. The results indicate that the dynamic theological test is an effective method for obtaining the master curve. Besides, the CAM model can describe well the viscoelastic deformation characteristics of asphalt mixtures.

台达20PM在精密冲压成型机上的应用

介绍精密冲压成型机的生产工艺,及台达运动型控制器20PM电子凸轮功能配合台达高性能ASD-A+伺服驱动器对其控制的实现方式。

冲压成型机上的高精度伺服控制系统20PM

本文主要介绍精密冲压成型机的生产工艺，及通过台达运动型控制器20PM电子凸轮功能配合台达高性能ASD—A＋伺服驱动器的实现方式。

基于SIMOTION控制器的追剪运动控制系统的研究

追剪控制是加工制造自动化行业中应用十分广泛的一种控制方式。介绍了以SIMOTION D425为控制单元实现追剪控制的原理和方法,代替了传统的PLC与高速计数器控制方式。采用Cam曲线的方法来控制伺服电机的同步运行,通过软件实现追剪轴的准确定位,更加的方便,最终达到追剪运动控制的目的。对追剪运动控制的硬件和软件系统进行了设计,最终通过scout软件中的trace功能可以直观的记录两轴之间的位置变化。

基于台达20PM运动控制器的线缆裁切机

本文主要介绍了台达20PM运动控制器在线缆裁切设备中的应用。并阐述了设备的工作原理、工艺要求及飞剪功能的应用概要。