Experimental study on a single particle trap with a pneumatic vibrator matrix

This paper describes a fundamental study on a pneumatic particle trap with a vibrator matrix. The particle trap device consisted of pneumatic vibrators and a trap chamber used to trap a particle. The entire structure was fabricated from polydimethylsiloxane (PDMS). The particle in the trap chamber was manipulated and trapped in the equilibrium region by exploiting the geometrical symmetry of the vibrators. The x-axial velocity of the viscous fluid induced by the deformation of the flexible diaphragms was eliminated or minimized at the center of two vibrators. Therefore, a particle could be trapped in the central capturing region by two or four vibrators. The trapping of static and dynamic single particles was observed to verify the proposed operational method.     

Experimental investigation of mixing-enhanced swirl flows

The experimental objective was to compare disintegration characteristics from the internal mixing pneumatic nozzles under the different operating conditions in terms of swirl angles. For this investigation, supplied air pressures and nozzle configuration ratios were fixed. This experimental comparison is of fundamental importance to the understanding and modeling of turbulent atomization because the axisymmetric swirling flows involve relatively complex interactions. For the measurement, four internal swirl mixing nozzles with axisymmetric holes at swirl angles of 15°, 30°, 45°, and 60° to the central axis were employed, which is responsible for the enhancement of mixing in pneumatic jets. To illustrate the swirl phenomena quantitatively, the distributions of mean velocities, turbulence intensities, and SMD (Sauter mean diameter, or D₃₂) variations with different configuration ratio were comparatively analyzed. It indicated that the atomization characteristics are performed well in the case of 30° of swirl angle, and that turbulence intensities are gradually degenerated with the increase of radial distances, showing a slight increment of SMD at downstream region. In particular, measurements showed that nozzle configuration is one of the significant geometrical parameters affecting the spray trajectories. This paper was recommended for publication in revised form by Associate Editor Jun Sang Park     

风动泵技术在飞机系统中的应用浅析

在介绍风动泵技术起源的基础上,进一步分析了风动泵技术的原理、特点及应用,并说明了应用前景以及应用局限。     

摆动伺服气缸定位控制策略与实验研究

针对目前普通摆动气缸不能实现行程中任意点准确定位的问题,研制了摆动伺服气缸。构建摆动伺服气缸控制子系统,对摆动伺服气缸控制特性进行分析,研究利用BP神经网络对阻尼角度进行预测,为有效抑制定位过程中的扰动实现精确定位,提出阻尼角度动态补偿的定位控制策略。对摆动伺服气缸性能试验结果表明：在采用阻尼角度动态补偿的定位控制策略下摆动伺服气缸既保持气压传动高速特性又实现行程范围内任意位置的快速、精确定位,实验表明阻尼定位均能在0.15 s内实现,且过程平稳无速度突变,实际位移无超调和震荡,定位误差在±1.0°以内。     

多功能气动元件测试台的开发

该多功能气动元件测试合的开发,满足了15吨卡车上的各类非标准气动元件的质量测试工作。测试台构思新颖,布局合理,操作方便,并用计算机进行数据采集、处理、打印,软件包可以画出相应的气动回路图,有汉字性能及良好的人机交互界面。     

简易啤酒桶装灌装机气动系统及其PLC控制

本文介绍了啤酒桶装线中的关键设备灌装机的结构、生产工艺流程,气动系统及其PLC控制流程。实际使用表明该设计简单可靠,性能良好,可供参考。     

气动伺服系统在多点焊机上的应用

本文针对气动伺服系统在上海汇众汽车零件有限公司多点焊机上的应用,介绍了气动伺服系统的组成和功能。     

Simplified model for particle collision related to attrition in pneumatic conveying

This paper presents a simple method for predicting particle attrition during pneumatic conveying. The model calculates the changes in the particle size during pneumatic conveying (as a result of the collisions between the particles and bend walls) by using empirical correlations for both the machine and material functions. The method does not require the use of complicated simulations such as DEM–CFD. Furthermore, the computational model was written in MATLAB, and the results agree well with the experimental results for salt particles. The computation time was very short: a few seconds for the first collision (particles passed through one bend), and below one minute for six collisions. The experimental results and parametric study show that higher bend radius ratios caused less damage to the conveyed material. Moreover, higher air velocities and larger pipe diameters caused more damage to the conveyed material.     

气动增压泵在单片晶圆清洗过程中的应用

主要分析了气动增压泵的组成和工作原理,描述了气动增压泵在单片晶圆清洗过程中的应用特点和优势.介绍了气动增压泵在应用过程中的控制方法和选用注意事项.     

矿用风动水泵的参数设计

采用内、外表直积法，对风动水泵进行了ＳＮ比试验分析，确定了其最佳参数组合。