S7-1200利用高速脉冲输出方式实现打印

本文介绍SIEMENS S7-1200利用高数脉冲（Pulse Train Output,PTO）功能与MCU进行通讯的方法,具体介绍其中的一个应用：用PTO实现S7-1200的字符打印输出。     

A review on front end conversion in ocean wave energy converters

Harvesting the energy from ocean waves is one of the greatest attractions for energy engineers and scientists. Till date, plenty of methods have been adopted to harvest the energy from the ocean waves. However, due to technological and economical complexity, it is intricate to involve the majority of these energy harvesters in the real ocean environment. Effective utilization and sustainability of any wave energy harvester depend upon its adaptability in the irregular seasonal waves, situation capability in maximum energy extraction and finally fulfilling the economic barriers. In this paper, the front end energy conversions are reviewed in detail which is positioned in the first stage of the wave energy converter among other stages such as power take off (PTO) and electrical energy conversion. If the recent development of these front end energy conversion is well known then developing wave energy converter with economic and commercial viability is possible. The aim of this review is to provide information on front end energy conversion of a point absorber and emphasize the strategies and calamity to be considered in designing such kinds of devices to improve the energy harvesting competence. This will be useful to the engineers for speeding up the development of a matured point absorbing type wave energy converter.     

一种分动器调整垫片的尺寸链计算及优化

在介绍分动器的基础上,对耦合器式分动器总成中关键调整垫片的测选尺寸链计算方法进行了深入的分析,并针对目前工艺方法存在的不足进行了优化,通过优化提高了分动器的装配质量和装配效率。     

S7-22×PLC在扭矩仪系统开发中的应用

介绍了扭矩仪以及S7-22×PLC在该系统开发中的应用。根据系统功能要求分析和介绍了系统的控制功能图、系统软件编程思路以及PLC程序功能模块。在开发中主要采用了基于PC的控制系统,但是PC机不能直接驱动电机,需要借助于PLC或单片机。而后两者在数据处理、存储、显示等方面的功能又不及前者。实践中采用了PLC。自由口协议就是在自由口模式下用户可以自己定义协议来与其他智能设备进行通信。自由口模式支持ASCII和二进制协议,实践中采用了ASCII协议,即通信中发送的是ASCII码。自由口通信把PC机和PLC的优点结合在了一起,只需要PC机向PLC发送相关指令,PLC即可按照要求去驱动电机。而这并不妨碍数据采集和处理模块的并行运行,提高了系统的可靠性和响应及时性。     

Construction of functional aliphatic polycarbonates for biomedical applications

Aliphatic polycarbonates are one important kind of biodegradable polymers and have been commonly used as integral components of engineered tissues, medical devices and drug delivery systems. As far as the biomedical application is concerned, traditional aliphatic polycarbonates usually suffer from the strong hydrophobicity, deficient functionality, and insufficient compatibility with cell/organs. Consequently, the application is quite limited in scope. Due to the imparted appealing properties, aliphatic polycarbonates bearing specifically designed functional/reactive groups attract great interest from researchers in the recent years. The present review outlines the development up to date concerning the design and biomedical application of functional aliphatic polycarbonates, with an emphasis on their ring-opening (co)polymerization preparation.     

柴油机后取力开发过程中的故障分析及解决方案

潍柴动力开发了一款后取力柴油机，但在进行后取力耐久试验时一直问题不断，后取力最大输出扭矩仅达到650N·m，而且一致性不好。本文主要介绍在后取力耐久试验中出现的问题以及解决方案。     

多工位管端成形机控制器的设计

多工位管端成形机是对管件的管端进行切削、倒角、旋沟加工的机电一体化设备。根据多工位管端成形机加工精度高的工艺特点,结合光栅尺和伺服电机,本系统使用了PLC内部高速计数器和脉冲输出单元,实现了成形机的运动控制。该系统具有一定的适用性。     

拖拉机输出轴开裂原因分析

根据化学分析，金相检验和裂纹成因分析，认为拖拉机输出轴产生的裂纹和脱裂是由于碳，锰总量超出，降低了Ms点，使轴的淬火温度偏高，组织应力增大，当内应力超过材料强度极限时产生裂纹，调整热处理工艺由原来的840℃淬火为800℃淬火（水淬），540℃回火，弧形裂纹及脱裂现象不再出现。     

Experimental study of the functionality of a semisubmersible wind turbine combined with flap-type Wave Energy Converters

In the present paper the functionality of the Semisubmersible wind energy and Flap-type wave energy Converter (SFC) is examined experimentally. In order to study the functionality of the SFC, the focus is on operational environmental conditions. SFC is a combined concept that utilizes offshore wind energy and ocean wave energy for power production. Details are presented as far as the physical modelling of the wind turbine with the use of a redesigned small-scale rotor and of the Power Take-Off mechanism of the Wave Energy Converters (WECs) with the use of a configuration that is based on a mechanical rotary damper. Tests with quasi-static excitation, motion decay, regular and irregular waves without and with wind that is uniform are conducted on an 1:50 scale physical model. The experimental data are compared with numerical predictions obtained by a fully coupled numerical model using Simo/Riflex tool. A good agreement is observed between experimental and numerical predictions. The combined operation of WECs doesn't affect the tension of mooring lines nor the acceleration of nacelle and the bending moment in tower's base. The produced power of the WECs of the SFC and consequently the functionality of the SFC is estimated.     

DSP56F807在交流随动系统中的应用

DSP56FS07芯片采用了不同于通用CPU和MCU的特殊软硬件结构,实现了高速的数字处理以及实时地进行系统控制。作为控制电机的专用产品,许多片内外设的功能设置大大简化了电机控制系统的设计。文章通过随动控制器串口的设计、限位及制动的实现过程介绍了DSP56FS07的应用。