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Liu H.,University of Shanghai for Science and Technology | Chen X.,University of Shanghai for Science and Technology | Cai X.,University of Shanghai for Science and Technology | Yu F.,China Productivity Center for Machinery
Huagong Xuebao/CIESC Journal | Year: 2012

For measuring size, concentration and velocity of droplets from the cyclone separator inlet and outlet, a measurement system based on trajectory image processing was developed. Principles of measurement were introduced. Droplets from cyclone separator were always spherical under the surface tension of water. It was reasonable to approximate the width of trajectory particle image as the diameter of droplets. The distance over which droplets moved in exposure time was obtained from trajectory image by processing, and the velocity of droplets could be easily calculated. Telecentric lens was used as an important part of measurement system. Common lens exhibited varying magnification for objects at different distances from the lens, but telecentric lens provided the same magnification at all distances, so droplets at different distances were the same size in the image. Firstly, images of particles were taken by capture system, and images were processed with a computer program. Then the particle size, concentration and velocity could be calculated. The system was installed in an experimental set-up that was used to study the performance of the cyclone separator. The experiment results showed that the system avoided the inversing process and had high size resolution as compared with traditional measurement system with the light scattering method. And it could make a measurement in line, and was better than other systems. Source

Tian Y.,Beijing Jiaotong University | Jin Z.,Tsinghua University | Pei F.,China Productivity Center for Machinery | Nie S.,Tsinghua University | Lu Q.,Tsinghua University
Qiche Gongcheng/Automotive Engineering | Year: 2014

In LabVIEW integration environment, by using industrial bus modules and adopting multithreading technology, a measurement and control system of hydrogen consumption test bench for fuel cell vehicles is developed. The system can perform the functions of test, control, monitoring, alarming and data processing according to test specifications. Test results show that the system works stably and reliably and has good maintainability and expandability with its measurement accuracy meeting test requirements, providing a basis for further study on the measurement technique of hydrogen consumption for fuel cell vehicles. Source

Ji Q.Q.,Shandong University | Li F.Y.,Shandong University | Xi D.Y.,China Productivity Center for Machinery | Yang X.D.,Shandong University | Meng Q.,Shandong University
Advanced Materials Research | Year: 2013

Mostly, mechanical products designers are lack of environment knowledge, and it is difficult to design environmentally friendly products rapidly. In this paper, a model of mapping relationships for green feature is established to extract the environmental impact factors, aiming at realizing green design. On the basis of the conceptual design of mechanical products, the mapping relationships between conventional and green design domains are found out to build the standard mapping relationships system of products. Then, for similar products, the green feature can be got by the system so as to do the environmental impact assessment. © (2013) Trans Tech Publications, Switzerland. Source

Zeng Y.,Sany Group Research Institute | Zhang R.,Taiyuan University of Technology | Wang Y.F.,China Productivity Center for Machinery
Applied Mechanics and Materials | Year: 2012

Spline is an important component to ensure transmission and connection in the mechanical design. But species and parameters of the spline are different according to the different national standards. In order to meet the user requirements, this paper developed spline rapid design function on VC2005 platforms with UDF method based on Pro/E platform that applies Pro/E secondary development kit Pro/TOOLKIT, uses Access database, and realizes selection design function of the spline type and parameter for China Standard, American standard, Germany standard etc.. Through practical application, the requirement of spline rapid design function in Pro/E is satisfied. © (2012) Trans Tech Publications, Switzerland. Source

Huang Y.,Beijing Municipal Research Institute of Environmental Protection | Li G.,Beijing Municipal Research Institute of Environmental Protection | Liu M.,Beijing Vehicle Emission Management Center | Gao Y.,Beijing Vehicle Emission Management Center | And 2 more authors.
2011 International Conference on Consumer Electronics, Communications and Networks, CECNet 2011 - Proceedings | Year: 2011

The vapor emission control of citywide service stations in Beijing has completed in 2008. 40 service stations have been tested according to China national standards between year 2008 to 2010, and 5 service stations have been tested in 2010 time after time. The result shows that in 2008 the acceptance test attainment rates of air tightness, dynamic back pressure, and air to liquid volume ratio (A/L) of vapor recovery system were 65.0%, 95.3% and 81.5%, which is better than the initial control level of Germany and America. The air tightness failure is due to the leakage of manhole covers, gauge hatches, P/V valves of underground tanks, etc. The dynamic back pressure failure is due to small diameter and inadequate slope of the vapor pipelines, etc. The A/L is failed because the vacuum pump failure, A/L control valve off, etc. The annual test attainment rates of air tightness, dynamic back pressure, and A/L of vapor recovery system raised to 82.5%, 85.0% and 84.8% in 2009, which is about the same in 2010. It also indicates that the attainment rate of distributed vapor recovery system is slightly higher than centralized system. The attainment rate of A/L is positively correlated with dynamic back pressure (R2=0.26), and is negative correlated with the average gasoline amount dispersed by all fueling nozzles of each station (R2=0.04). The exceeded A/L value rate of fueling nozzles, which is about 50% non-attainment of A/L, is less than 10%. Four times of test in every half year can raise the attainment rates of these three indicators of vapor recovery system from 65% to 90%. On-line monitoring systems were suggested to install in designated service stations according to GB 20592 as early as possible. © 2011 IEEE. Source

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