点焊焊接电流波形的实时液晶显示系统

焊接电流对电阻点焊有着重要的影响,因此在点焊过程中实时显示焊接电流波形是十分必要的。文章设计了采用DSP器件TMS320LF2407A及TFTs6448b液晶控制器,实现对点焊电流波形的实时显示系统。系统设计实现了数据采集存储,并通过软、硬件结合的方式,满足了LCD的时序及实时显示要求。将研制的点焊电流液晶显示系统,在生产现场对NA-16点焊机的焊接电流波形进行了实时测试,在焊接过程中获得了失真度很小的点焊焊接电流波形。结果表明,文章提出的DSP点焊焊接电流波形的液晶显示系统设计是合理的,具有较高的显示精度及较好的实时性。     

Simulation study of the dynamic characteristics of the electromagnetic flame-proof mechanism

Since the overloads of the electromagnetic flame-proof mechanism under different working conditions are complex and hard to be verified, a numerical simulation method of this mechanism working process is proposed with the combination of Adams and Simulink. First, a simulation model of electromagnetic flame-proof mechanism was established, which includes the safety pin, the spring, and the exciting coils and so on. Then, the model was imported to Adams taking constraints into consideration, which include the contacts, kinematic pairs and the spring. The co-simulation model was established through the union of Adams and Simulink. The model was tested via simulations, and the obtained results were analyzed finally. The results show that the method can simulate the dynamic process of the electromagnetic flame-proof mechanism during the service process and under the normal power supply condition, and therefore the motion displacements of the electromagnetic pin under different working conditions can be obtained through simulations. It can verify the mechanism''s designing rationality, thus laying the foundation for the physical prototype testing and reducing the repetition of the product''s design process.     

水利工程防汛工作对策研究

水利工程作为国民经济建设的重要基础项目,对经济建设发展有着不可忽视的重要影响。尤其是近年来随着我国经济建设的不断创新与发展,对水利工程建设的要求也越来越高。基于此,文章主要针对现阶段我国水利工程在防汛等方面存在的问题进行简要地分析与总结,希望通过文章的简短介绍可以为相关人员提供一定的参考意见,并为我国水利工程防汛工作的良好发展贡献力量。     

COB围坝胶的制备及其触变性研究

以乙烯基硅油、乙烯基硅树脂、含氢硅油等为基体树脂,CaCO3为主要填料,气相二氧化硅为促变剂,制备了COB模块光源用围坝胶,研究表面改性二氧化硅对围坝胶的增稠和触变性的影响.结果表明:经表面改性的气相二氧化硅是围坝胶良好的促变剂,且气相二氧化硅的改性程度越高,疏水性越强,围坝胶的促变性就越强.     

粉末触媒与片状触媒合成效果分析

就粉末触媒、片状触媒的合成效果进行了对比，并分析了粉末触媒合成金刚石的市场前景。     

大腔体合成工艺初探

就目前普遍采用的大腔体合成工艺进行了分析与改进，提出了新的大腔体合成工艺方案。     

点焊焊接电流波形及其FFT幅频图的液晶显示

基于TMS320LF2407A型DSP(数字信号处理器)和TFTs6448b型液晶屏控制器,采用间接控制的接口方式,实现了DSP和液晶屏控制器之间数据交换的速度匹配;系统软件采用C语言程序调用汇编语言编写的FFT程序包,确保了FFT算法的执行速度.在交流点焊机上进行了低碳钢点焊的上机检测试验.结果表明,研制的液晶显示系统可以实现点焊电流信号采集、快速傅立叶变换、波形及频谱图的实时显示,证明了系统软、硬件设计的有效性.