共查询到20条相似文献,搜索用时 15 毫秒
1.
高压气体声速精密测量系统的研制与测试 总被引:1,自引:0,他引:1
声速是目前可测量准确度最高的热物性之一,也是热力学基础研究和工程应用的重要基础参数.本文基于圆柱定程干涉法原理,建立了国内首套可测量至高压(6 MPa)的精密声速测量系统,解决了高压气体声速测量的关键问题,极大拓展了国内已有实验系统的测量范围(1 MPa),也是国际上首次将圆柱声学共鸣腔应用于1MPa以上而且测量不确定度达到0.01%的成功尝试.新建立的实验系统包括声学圆柱共鸣腔及耐高压压力舱、频率测量系统、温度测量系统、高压压力测量系统、高压进气及真空系统.实验测试结果显示,新系统的声速测量不确定度小于0.01%,可应用于温度从220K至440K,压力高达6 MPa的气体声速测量. 相似文献
2.
印刷机高速给纸实验装置的研制 总被引:2,自引:0,他引:2
分析了给纸装置的运动,设计了一种用于高速给纸机构的实验装置,论述了实验装置的主要技术要求和总体结构,实现了实验装置的控制系统和软件的设计。实验装置可以通过计算机进行控制,相关的变量改变简单,调试运行表明系统运行良好。 相似文献
3.
4.
Md. Golam Mostofa J. H. Noh H. Y. Kim J. H. Ahn D. B. Kang 《Journal of Mechanical Science and Technology》2010,24(8):1623-1629
PMMA optical components that are used as one of the most important parts of high precision equipments and machines are increasingly
replacing the glass due to the various advantages of PMMA. Especially in Light Guide Panels, the PMMA sheet that is used in
Liquid Crystal Displays plays an important role in scattering the incident light and requires very fine machining as the sheet
is directly related to the optical characteristics of the panels. The High Speed End milling and High Speed Shaping processes
that are widely adopted and applied to the precise machining of Light Incident Plane still have quality problems, such as
cracks, breakages, poor waviness, and straightness. This paper presents the tooling device design for machining a Light Incident
Plane through vibration-assisted High Speed Shaping for increasing the optical quality by minimizing the above-mentioned problems.
The cutting tool and the tool post presented in this paper are designed by the authors to increase the magnitude of the cutting
stroke by adopting the resonant frequency without weakening the stiffness and to reduce vibrations during even high speed
feeding. The dynamic characteristics of the cutting tool and the tool post are evaluated through simulation and experiment
as well. The results reveal very appropriate dynamic characteristics for vibration-assisted High Speed Shaping. 相似文献
5.
6.
The cutting temperature and temperature distribution along the rake face of cutting tool and work piece is an essential factor in study of machining processes due to its effect on surface quality, tool life, tolerances, metallurgical behavior and chip-removing rate. Several methods have been introduced to measure temperature during machining, such as the thermocouple technique, infrared camera and metallurgical methods. Each of these methods has some advantages and limitations. In this article, an infrared high-speed sensor with specially designed software has been used to measure the transferred heat to the work piece during high speed machining (HSM) of bronze alloys. The results revealed that this system enhances accuracy and reduces the number of tests required. 相似文献
7.
Yoshikazu Arai Akinori Inada JianHong Yang Wei Gao 《International Journal of Precision Engineering and Manufacturing》2009,10(5):27-32
Profile measurement of a scroll compressor is important for improving compression efficiency. This paper describes the height
profile measurement of a scroll compressor in the manufacturing line using a prototype measurement system. A commercial CMM
is also employed for comparison. The measurement repeatability of the height profile by the prototype measurement system is
approximately ±1 μm, which satisfies the requirements from the manufacturing line. Through compensation of the tilt component,
result of the prototype measurement system is in good agreement with that of the commercial CMM. 相似文献
8.
9.
Michele Germani Maura Mengoni Margherita Peruzzini 《The International Journal of Advanced Manufacturing Technology》2013,68(9-12):2185-2203
This paper deals with the simulation of material texture by means of electro-tactile stimuli, which directly derive from real material properties. The research presents a novel tactile display by its hardware and software system architecture and the elaboration procedure to generate the stimulating signals, and validates the adopted simulation strategy by experimental testing. The tactile system elaborates data from scans of real material samples and generates electrical stimuli to reproduce roughness and texture coarseness sensations. It also adds a coherent sound feedback to improve the realism of the simulation. The research defines also an experimental protocol based on the theory of Psychophysics to carry out system calibration and tests with users. The scope is to validate the proposed tactile system as a new tool for material simulation, which can be adopted for material virtual prototyping in several fields (product design, textile and clothing, gaming and entertainment, virtual museum, rehabilitation, etc.). Experimentations have been carried out to measure the users’ response to our different material classes (wood, paper, rubber and textile fabric). Experimental results concern how good the adopted simulation approach is and the analysis of the human tactile perception simulated by the system. Main findings relate to the system performance and the users’ response in terms of signal recognition and material class discrimination. 相似文献
10.
在中高比转速内,对中高比转速清水离心泵进行了改进设计、CFD分析及试验研究,并与原同型号离心泵在性能方面进行了比较,初步找到了提高中高比转速清水离心泵性能的方法。 相似文献
11.
高速切削过程测温方法综述 总被引:3,自引:1,他引:3
切削温度与加工精度和刀具磨损密切相关,高速切削过程中切削温度随着材料,刀具,切削用量的选择不同而呈现出与普通切削过程不同的变化规律.本文归纳了高速切削当中切削温度的测定方法,并指出了各种方法的优缺点及适用性. 相似文献
12.
13.
14.
介绍了采集管线中液态介质专用的吸管式取样阀组结构特点、工作原理和应用范围,给出了主要的设计计算以及设计中应注意的问题,设计方法及适用工况。 相似文献
15.
高速旋转机械是一种广泛应用于石油化工、航空和动力工程的关键设备。旋转机械的转子在运行过程中由于多种原因会偏离动平衡状态。一旦出现这种情况,转子会发生剧烈的振动,严重时会使设备失效。解决这种问题的传统方法是停车对转子进行再平衡。提出了一种用于高速转子在线主动平衡的新型平衡装置的结构设计,以消除由于旋转机械停车给系统带来的影响。介绍了平衡装置的工作原理和控制方法。讨论了平衡装置中的驱动原件—压电振子的设计要点和其产生行波振动的条件。 相似文献
16.
基于光电红外传感器的电机转速检测控制装置设计 总被引:1,自引:0,他引:1
随着电机在现代工业和农业中应用的日益广泛,工农业生产机械化和自动化程度发展迅速。电机转速的测量和控制引起了广泛的关注,但是测量精度、实用性等问题一直没有得到很好的解决。为了实现电机转速的精确测量和控制,该文采用C8051F020单片机作为主控制器,设计了一个基于光电红外传感器的电机转速检测控制系统。为此,介绍了系统的功能、结构框图,并阐述了其硬件和软件的设计与实现。 相似文献
17.
针对风洞分离实验对于视觉测量系统的高精度、大视场、高速的测量要求,提出一种基于单目摄像机的风洞运动目标位姿测量方法。该方法利用单目摄像机进行运动目标位姿信息测量,相比于双目测量方法具有设备简单、视场大的优点。首先提出一种基于靶标特征点相互约束关系的参数优化方法,采用复合式靶标实现摄像机的快速高精度标定;针对目标运动图像处理,提出一种基于图像差叠法和标记点位置估计的图像快速分割与目标定位方法,实现图像特征的快速准确定位;针对单目测量要求及目标运动特性,提出一种基于方向估计标记点布局方式,实现合作标记点的快速识别和提取;最后利用单目视觉原理求解运动目标的位置和姿态信息,通过实验室模拟实验完成了测量系统的精度验证,在1 m×1 m视场范围内,其位移测量精度可达到0.19 mm,俯仰和偏航角测量精度可达到0.18°。 相似文献
18.
高功率激光装置中靶的进化式位姿检测 总被引:1,自引:0,他引:1
高功率激光装置中靶的定位精度直接影响激光打靶的成功率。提出一种基于立体建模的进化式微小靶标位姿检测方法,该方法抛弃已有的图像处理算法对单幅图像进行特征提取的过程,通过建立立体模型将多视角图像中的目标相关联,实现相互制约的立体匹配。在模型优化方面,模拟人眼的"扫视"与"注视"功能改进遗传算法,使模型优化能同时兼顾精度与速度,为实现快速、高精度的靶自动检测与定位提供技术基础。实验搭建了3-CCD视觉检测平台并通过视觉反馈控制对标靶进行定位调整,所得定位精度小于5μm,角度误差小于0.05°。实验结果满足激光打靶要求,可应用于实际工程中。 相似文献
19.
20.
实现汽车恒速下坡控制对于提高汽车运输效率和安全性具有重要意义。针对加装液力缓速器汽车恒速下坡控制的特点,通过分析汽车下坡缓速制动过程,建立汽车下坡缓速器制动仿真模型。根据缓速器缓速制动原理设计了基于Matlab/Stateflow逻辑控制的恒速控制器,在Matlab/Simulink中选取混凝土、卵石、砂石等不同路面条件对汽车恒速下坡过程进行仿真分析,得出了充液率调节值对车速变化的影响关系,得到了汽车在不同路面条件下实现恒速制动的充液率合理调节取值。仿真结果表明液力缓速器单独作用于汽车制动可以实现恒速下坡控制,路面条件与液力缓速器充液率调节值大小对恒速控制性能有着重要的影响。 相似文献