基于创新扩散理论的RP技术扩散模型分析

利用微积分方法定量地对技术创新扩散的模型和发展规律进行了探讨,揭示了技术创新扩散发展变化的动力学特征.并利用该扩散模型对RP技术的推广应用进行了研究,建立了RP技术扩散模型,根据该模型对RP技术的推广情况做出了预测,这对RP技术在我国的推广应用具有一定的参考价值.     

多机联合网络化加工技术的研究

本文阐述了数字化网络制造技术的组成和应用,对数字化网络制造技术的服务平台和相关技术进行了研究,并通过实例介绍了多机联合加工技术的应用及其特点,并对该技术的实现方法进行了详细的分析。     

现代数字化设计在机械设计制造技术中的运用

现在社会上很多领域都运用了数字化设计技术,该技术的运用能够对国家各个行业发展提供很大的助力。目前,数字化设计技术已经在机械设计制造中实现了广泛应用,而且取得了显著成效,如,可以对制造效率和质量进行提升、可以提高设计科学性等。本文简单介绍了数字化设计技术内涵和特点,并对应用热点进行了阐述,同时提出了在机械设计制造中运用该技术的策略,希望可以为相关人士提供参考。     

探讨在煤矿电机中变频调速技术的应用

本文对煤矿电机中变频调速技术的长处和亮点进行了阐述,结合实际应用分析和总结了现阶段变频调速技术中存在的不足和缺陷,收集资料对该技术的操作技术和理论原理进行了介绍,深入研究了变频调速系统的主要构成部件。     

浅析激光表面合金化技术的应用及发展方向

介绍激光表面合金化技术的原理、特点和应用,对激光表面合金化技术的国内外研究进展进行综述,指出该技术存在的问题,并对其发展方向进行了预测和展望。     

逆向工程在产品设计中的实践研究

首先对传统正向工程技术运用于产品设计时带来的缺陷进行了总结,随后提出了逆向工程技术的概念、介绍了该技术的设计模式和优点。在此基础上,通过对该技术运用于具体实例的情况进行分析,得出:基于3Dscan-Alias-Pro/ENGINEEr的逆向技术运用于产品设计时可以实现预期的优点,并提出运用逆向工程技术结合传统正向工程技术完成产品的创新设计方法。     

立式回转电火花线切割加工特牲分析

提出了一种立式回转电火花线切割加工新技术,简要介绍了该技术的基本原理和特点,并对其加工特性进行了详细分析,可以看出该技术在原理上具有许多优越性,是一种很有发展前景的加工技术。     

基于针织圆纬机控制器的电子考勤系统

针对国内针织行业中RFID、GPS等无线技术应用有限,员工工作时长等数据的收集和保存方式大多停留在传统的纸和笔记录方式的现状,对无线技术进行了研究,并对该技术应用方式和场合进行了归纳。提出了一种基于针织圆纬机控制器的电子考勤系统,该系统集人机操作、实时控制、电子考勤于一体。利用RFID射频识别技术,结合嵌入式技术,将针织圆纬机控制和员工考勤有机地结合,根据所需记录的数据类别和数据量,选用了合适的读卡器芯片和IC卡,并进行了存储结构的分析和设计。对一体式控制系统进行了长期的测试,并通过PC端设计的专用读写软件进行了数据的读取对比。结果表明,该系统可以方便且稳定地进行刷卡操作,并可以将数据完整地记录于卡片和系统中,实现了员工上下班时间、机器运转时间、产量等数据的统计。     

多流路柱切色谱法分析焦炉气的研究与应用

利用多流路柱切色谱技术实现焦炉气全组分气体分析,对该技术进行了研究和应用介绍。对在实际应用中遇到的一些问题进行了分析和改进,并通过实验,证明该方法不仅完全可以实现气化炉全组分气体分析,该方法还具有分析方法简单、分析效率高、分析数据准确、色谱柱使用周期长等优点。     

超短光脉冲光强分布实时测量

利用ＣＣＤ技术和计算机控制技术可以实现对超短光脉冲进行空间光强分布的实时测量。该系统结构简单、使用方便，很适合于得研单位和研究领域。本文论述了该系统的结构和原理，并对几种工作方式进行了说明。     

淬火45钢激光微加工工艺试验研究

采用激光表面微造型技术(LST),利用"单脉冲同点间隔多次"激光微造型工艺,在淬火45钢试样表面进行激光微造型工艺试验。主要进行脉冲重复次数与凹腔深度、脉冲重复频率与扫描速度对加工质量影响的试验研究,分析激光参数对加工质量的影响规律,得到了较优化的激光工艺参数组合。     

三维激光视觉系统的研究现状及在汽车工业的应用

三维激光视觉系统是以计算机、信息处理三维图象处理、激光为基础的高新技术、介绍三激光视觉系统的原理、研究现状及在汽车工业界的应用。     

Fizeau激光波长计测量脉冲激光波长

详细讨论了采用单片机控制的Fizeau波长计测量脉冲激光波长的两种方法,包括脉冲激光同步测量方法与软件判别捕捉方法,文章最后给出了系统的测量结果,其测量精度与测量连续激光相同,即绝对精度<10^-6,分辨率<10^-7.     

An Experimental Study and Statistical Analysis of the Effect of Laser Pulse Energy on the Geometric Quality During Laser Precision Machining

In laser precision machining, process parameters have critical effects on the geometric quality of the machined parts. Due to the nature of the interrelated process parameters involved, an operator has to make a host of complex decisions, based on trial-and-error methods, to set the process control parameters related to the laser, workpiece material, and motion system. The objective of this work is to investigate experimentally the effect of laser pulse energy on the geometric quality of the machined parts in terms of accuracy, precision, and surface quality. Experimental study of formation of machined craters on thin copper foil with variation in laser pulse energy, the geometry and the surface topology of craters is presented. The geometrical parameters were measured and statistically analyzed with respect to incident pulse energy. Statistical analysis including pattern recognition was employed to analyze the experimental data systematically and to serve proper selection of the process parameters to achieve the desired geometric quality of the machined parts. Plausible trends in the crater geometry with respect to the laser pulse energy are discussed. The technique has been verified experimentally on simple geometrical features such as circles and grooves, and the geometric quality is evaluated.     

一种实现激光照排机输片控制的数字锁频技术

提出了一种在激光照排机电控系统中,利用单片微机对转镜扫描光栅频率信号的瞬时波动量进行检测、提取,并以此实时校正系统输片速度,实现场扫描对行扫描的跟踪、补偿,从而提高行、场扫描同步精度的方案。     

An Experimental Study and Statistical Analysis of the Effect of Laser Pulse Energy on the Geometric Quality During Laser Precision Machining

In laser precision machining, process parameters have critical effects on the geometric quality of the machined parts. Due to the nature of the interrelated process parameters involved, an operator has to make a host of complex decisions, based on trial‐and‐error methods, to set the process control parameters related to the laser, workpiece material, and motion system. The objective of this work is to investigate experimentally the effect of laser pulse energy on the geometric quality of the machined parts in terms of accuracy, precision, and surface quality. Experimental study of formation of machined craters on thin copper foil with variation in laser pulse energy, the geometry and the surface topology of craters is presented. The geometrical parameters were measured and statistically analyzed with respect to incident pulse energy. Statistical analysis including pattern recognition was employed to analyze the experimental data systematically and to serve proper selection of the process parameters to achieve the desired geometric quality of the machined parts. Plausible trends in the crater geometry with respect to the laser pulse energy are discussed. The technique has been verified experimentally on simple geometrical features such as circles and grooves, and the geometric quality is evaluated.     

激光刻划图像格式的分析与识别处理

叙述了计算机控制激光图像刻划能逼真地反映事物面貌的特点，提出激光图像刻划自动处理的技术和方法以图像格式的分析方法，并给出图像识别信息的数据结构。     

四路激光跟踪干涉三维坐标测量系统自标定与仿真

介绍了四路激光跟踪干涉三维坐标测量系统的工作原理，由于系统具有冗余特性，可以实现系统的自标定。重点研究了系统自标定的原理，采用初始动点的概念代替初始长度，建立了正确的自标定模型。提出了系统的标定和测量过程相互统一的新特征。最后综合运用各种数值算法对自标定模型进行了计算机仿真。仿真结果表明，激光跟踪干涉仪的测量误差对自标定参数的计算结果有重大影响。因此，自标定过程中需要保证激光跟踪干涉仪的测距精度。     

Investigation of laser and process parameters for Selective Laser Erosion

The process of Selective Laser Erosion (SLE) was investigated to study the effects of different process and laser parameters on the process outputs such as surface quality and erosion rate. The SLE process is a direct method to remove material in a layer-by-layer fashion due to high energy densities provided by the laser beam. In addition to its direct use as a subtractive manufacturing method, SLE may be used in combination with layer-additive techniques such as Selective Laser Melting (SLM). Such combination mainly makes sense when both processes can be performed with the same laser. However, one of the major problems involved in SLE process is the high number of the laser and process parameters (laser power, pulse frequency, scan speed, scan spacing, ambient atmosphere, etc.) and the complexity of the relations between them which has not yet been investigated completely.This paper presents an overview of the laser erosion process with nano-second Nd:YAG laser pulses and the results of several single-factor experiments that were carried out to determine the influence of the major parameters on the depth of erosion per layer and surface roughness. Additionally, the relations between the parameters are studied to investigate the interactions between them. The results from single-factor experiments showed that some relations were highly governed by the power intensity of the laser beam and also that cross interactions between the parameters play an important role on the output characteristics. The paper explains how multiple parameters (spot size, pulse frequency, scan speed, scan spacing) can be combined to define two indirectly controlled geometrical parameters, namely the scan and pulse overlap factors. Those two parameters allow calculating the number of hits of the laser beam on a same location on the workpiece possible which is the first step in physical modeling the topography of the surface left behind.     

参数相关随机信息约束下的地面脉冲激光扫描仪自校准

针对地面脉冲激光扫描仪自校准参数中存在的高相关性问题,基于全站仪误差模型提出了一种脉冲激光扫描仪自校准统一方法。该方法初始假设激光扫描仪的校准参数与全站仪的系统误差相似,通过引入估计参数的相关随机信息以及选择合适的网络配置,实现了降低参数相关性和提高参数估计可靠性的目的。通过平差方法对估计参数赋予权重信息,把所有参数都视为最小二乘平差中的观测值,权重越高参数相关性期望越低。最后,采用该方法对脉冲激光扫描仪Leica scan station实施了自校准。实验结果表明,该方法能够高精度估计大多数参数且实现了参数间的低相关性,有利于随机内部约束平差的使用;重大的系统误差是激光测距仪零误差和竖盘指标差,其中为了得到零误差的可靠估计,须以约1mm的精度确定扫描仪的位置。