The Experts below are selected from a list of 19806 Experts worldwide ranked by ideXlab platform
G.j. Lyman - One of the best experts on this subject based on the ideXlab platform.
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The effect of Jigging time and air cycle on bed stratification in a pilot scale Baum Jig
Fuel, 2003Co-Authors: R.x. Rong, G.j. LymanAbstract:A highly instrumented and controlled pilot Jig was constructed to study water motion behaviour or oscillation with the object of optimizing bed stratification of coal washing Jigs. Durable synthetic material, colour coded for density, was used as the bed material in a series of 114 experiments. The bed was fully analysed layer by layer for size and density distribution. It was found that Jigging time is a very significant parameter affecting the bed stratification. In general, bed stratification improves quickly up to a Jigging time of 180 s, and thereafter more slowly. When the Jigging time exceeds 300 s, the bed is in a state of dynamic equilibrium for material coarser than 8 mm; however, the finer particles (< 8mm) need more time to achieve such a state. To improve the bed stratification, operating parameters should be adjusted to generate suitable air and water behaviour in the Jig. A cycle with a long inlet period (199-220 °), which is seldom used at present, appears to provide such behaviour. Improvement of bed stratification by using an appropriate air cycle will increase the separation efficiency and yield of product in coal washing Jigs.
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Modelling Jig bed stratification in a pilot scale Baum Jig
Minerals Engineering, 2003Co-Authors: R.x. Rong, G.j. LymanAbstract:Abstract A modelling investigation of Jig bed stratification has been conducted using a large data base developed in a pilot scale Baum Jig. The influence of the Jig operating parameters and water behaviour parameters in the Jigging chamber on the bed stratification were analyzed. It was found that 1. i. Bed stratification is most sensitive to the Jigging time, followed by the frequency of pulsation, air supply pressure and inlet period of the air cycle. 2. ii. A single power function equation was used to effectively represent the relationship between the extent of bed stratification and the Jigging time. 3. iii. The Jig bed stratification is significantly affected by a number of water behaviour parameters in the Jigging chamber. The water pressure above the bed plate has a dominant effect, followed by the water displacement. The velocity and acceleration of the water have insignificant effects on the bed stratification. 4. iv. A model has been developed to describe the extent of bed stratification as a function of the water pressure above the bed plate and the water amplitude in the Jigging chamber. Such a type of model may be a basis for oscillation control of the Jigs.
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A new energy dissipation theory of Jig bed stratification. Part 1: energy dissipation analysis in a pilot scale baum Jig
International Journal of Mineral Processing, 1993Co-Authors: R.x. Rong, G.j. LymanAbstract:Abstract The dynamic energy dissipation within a Jigging cycle has been mechanically analyzed using data developed in a highly instrumented and controlled pilot scale Baum Jig. The analysis is based on the use of the energy and momentum equations for the fluid. It was found that energy balances on the water in the Jig failed to close because of elastic deformation of the Jig body, rather than inaccuracies in the measurement techniques or failure to account for heat transfer. This deformation problem appears to be common in either pilot Jigs or commercial Jigs. An empirical means of correcting the energy balance was devised and applied to the data with some success. Using this compensation method, the energy balance was improved. The likely energy balance indicates that (i) less than 7% of the energy of the incoming compressed air is expended in the Jig system, (ii) less than 5% of the energy from the compressed air is actually dissipated in the Jig bed, (iii) the kinetic energy input from the hutch water supply is effectively negligible, in comparison to the energy input from the compressed air, and (iv) about 2.5–3.7% of the energy from compressed air is dissipated around the bed plate.
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Review of Jigging Principles and Control
Coal Preparation, 1992Co-Authors: G.j. LymanAbstract:The Jig in its variety of forms applied in coal preparation has been a major unit in coal washeries for one hundred years; yet the principles of Jigging are still less well understood than those governing many other coal preparation unit operations. Jig control has also been viewed as an art rather than a science until recently. This review considers some of the history of Jigs and the theories that have been advanced to explain their operation. Special emphasis is placed on discussion of the means of control of Jigs, starting from the traditional means and working towards the novel methods that have been proposed recently. It is clear that our understanding of Jigs and the means by which they will be controlled in the future will benefit from our rapidly increasing engineering computational power and will make much fuller use of microprocessor control and modern instrumentation.
Yoji Isota - One of the best experts on this subject based on the ideXlab platform.
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Simulation and experimental investigation of Jig using semi-rigid cable for S-parameter method
2016 International Symposium on Antennas and Propagation (ISAP), 2016Co-Authors: Ryuta Tozawa, Takayuki Sasamori, Teruo Tobana, Yoji IsotaAbstract:Recently, the S-parameter method using a vector network analyzer was proposed whereby the differential input impedance of a balanced-fed antenna was obtained. To improve measurement accuracy of the S-parameter method, the dependence on the thickness of the semi-rigid cable used for the measurement Jig is obtained from the results of calculations using the FDTD method. Three types of Jigs each made from semi-rigid cables of differing thickness were fabricated, and the input impedance of the dipole antenna are calculated and measured using the S-parameter method. The impedances were compared with those obtained from the available theories by King. Results from the S-parameter method was found that using the thinner diameter coaxial cable can be more accurate measurements.
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A study on Jig using microstrip line for the S-parameter method
2015 IEEE Conference on Antenna Measurements & Applications (CAMA), 2015Co-Authors: Kazuma Endo, Takayuki Sasamori, Teruo Tobana, Yoji IsotaAbstract:Recently, the S-parameter method using a vector network analyzer and a measurement Jig instead of a balun was proposed whereby the differential input impedance of a balanced-fed antenna were obtained. As no balun is used, measuring impedance over a wide frequency bandwidth is now possible. To improve the measurement accuracy of the S-parameter method, the dependence on direction of SMA connectors of the measurement Jig is obtained from the results of calculations using the FDTD method. Two types of Jigs installed the connectors vertically or horizontally are modeled, and the input impedance of the dipole antenna is calculated using the S-parameter method. The input impedances are compared with those obtained from the available theories by King. Results from the S-parameter method roughly agree with the available theories by King, and the influence of direction of the connector is relatively small.
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Measurement Jig using semi-rigid cable for differential impedance measurement by S-parameters
2015 International Symposium on Antennas and Propagation (ISAP), 2015Co-Authors: Ryuta Tozawa, Kazuma Endo, Takayuki Sasamori, Teruo Tobana, Yoji IsotaAbstract:Recently, the S-parameter method using a vector network analyzer and a measurement Jig instead of a balun was proposed whereby the differential input impedance of a balanced-fed antenna were obtained. As no balun is used, measuring impedance over a wide frequency bandwidth is now possible. To improve measurement accuracy of the S-parameter method, the dependence on thickness of the semi-rigid cable used for the measurement Jig is obtained from the results of calculations using the FDTD method. Two types of Jigs each made from semi-rigid cables of differing thickness were fabricated, and the input impedance of the dipole antenna calculated using the S-parameter method. The impedances were compared with those obtained from the available theories by King and calculation results of delta-gap-fed dipole antennas. Results from the S-parameter method agree with the available theories by King and the calculated results of the conventional model of a dipole antenna, over a range of about 6 GHz or less.
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A study on Jig using semi-rigid cable for the S-parameter method
2015 International Workshop on Electromagnetics: Applications and Student Innovation Competition (iWEM), 2015Co-Authors: Ryuta Tozawa, Takayuki Sasamori, Teruo Tobana, Yoji IsotaAbstract:Recently, the S-parameter method using a vector network analyzer was proposed whereby the differential input impedance of a balanced-fed antenna were obtained. To improve measurement accuracy of the S-parameter method, the dependence on thickness of the semi-rigid cable used for the measurement Jig is obtained from the results of calculations using the FDTD method. Three types of Jigs each made from semi-rigid cables of differing thickness were fabricated, and the input impedance of the dipole antenna calculated using the S-parameter method. The impedances were compared with those obtained from the available theories by King. Results from the S-parameter method agree with the available theories by King, over a range of about 5 GHz or less.
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Influence of size of Jig made of microstrip line for S-parameter method
2014 IEEE International Workshop on Electromagnetics (iWEM), 2014Co-Authors: Taiga Yanagibashi, Takayuki Sasamori, Teruo Tobana, Yoji IsotaAbstract:Recently, S-parameter method that is the measuring method of the input impedance of the balanced antenna with a vector network analyzer is proposed. It is a problem of this method that the Jig influences measured value when the measuring frequency in-creases. To remove the influence of the Jig, we have examined compensating method using the ABCD-matrix. In this report, we examine the effect of the size of the Jig on the input impedance using the FDTD method. It is shown that the influence by the size of the Jig is small.
Junhua Zhang - One of the best experts on this subject based on the ideXlab platform.
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Research of analytic hierarchy process applying for case based reasoning in automotive welding Jig design
Proceedings 2013 International Conference on Mechatronic Sciences Electric Engineering and Computer (MEC), 2013Co-Authors: Huabao Yu, Guolin Li, Junhua ZhangAbstract:On the basis of the structure of automotive welding Jigs, the welding Jig case database is constructed in this paper. The analytic hierarchy process (AHP) is applied for partitioning the influence factors of automotive welding Jig case unit. The weight calculation and weighted coefficient distribution of case unit properties is presented adopting 1 - 9 scaling algorithm. Thus similarity can be calculated using neighbor similarity. The system case based on reasoning for welding Jig case database is developed with VC++6.0 and NX8.0 CAD software, which satisfies the design requirement of rapidity, high efficiency, flexibility and portability.
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Mixed inference combining CBR and RBR in the intellectualized CAD system of automotive welding Jig
2010 International Conference on Computer Application and System Modeling (ICCASM 2010), 2010Co-Authors: Junhua ZhangAbstract:A knowledge-based intellectualized CAD system of automotive welding Jig is proposed firstly. And then the repository that consists of process repository and design repository including design rule repository, module repository and case repository is discussed. So the method of object-oriented knowledge representation is used to construct the repository. The mixed inference combining CBR (Case-Based Reasoning) and RBR (Rule-Based Reasoning) is applied to the intellectualized design of the automotive welding Jig. As a result, the knowledge-based intellectualized CAD system of automotive welding Jig is developed. The initial intellectualized design of automotive welding Jigs on single work station can be completed using the system.
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Research on Case Based Intellectualized CAD System of Automobile Body Welding Jig
2008 Second International Symposium on Intelligent Information Technology Application, 2008Co-Authors: Junhua ZhangAbstract:According to the modularization, standardization and other characteristics of automobile body welding Jig, based on design experience, the analysis and summary of Jig structures, research on knowledge-based intellectualized CAD system of automobile welding Jig is carried out on the CAD software platform of NX. The model of knowledge-based intellectualized CAD system is established firstly. And then the concept of outer process repository and inner design repository which include design repository of rule, module repository and case repository is put forward. Outer process repository is the knowledge representation of automobile body processes, welding Jig design process sheet and design standards. The case base of automobile welding Jig is constructed. Group technology (GT) is applied to the coding data base of Jig. The algorithm of search case called vector comparison is applied to reasoning machine in the intellectualized CAD system.
R.x. Rong - One of the best experts on this subject based on the ideXlab platform.
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The effect of Jigging time and air cycle on bed stratification in a pilot scale Baum Jig
Fuel, 2003Co-Authors: R.x. Rong, G.j. LymanAbstract:A highly instrumented and controlled pilot Jig was constructed to study water motion behaviour or oscillation with the object of optimizing bed stratification of coal washing Jigs. Durable synthetic material, colour coded for density, was used as the bed material in a series of 114 experiments. The bed was fully analysed layer by layer for size and density distribution. It was found that Jigging time is a very significant parameter affecting the bed stratification. In general, bed stratification improves quickly up to a Jigging time of 180 s, and thereafter more slowly. When the Jigging time exceeds 300 s, the bed is in a state of dynamic equilibrium for material coarser than 8 mm; however, the finer particles (< 8mm) need more time to achieve such a state. To improve the bed stratification, operating parameters should be adjusted to generate suitable air and water behaviour in the Jig. A cycle with a long inlet period (199-220 °), which is seldom used at present, appears to provide such behaviour. Improvement of bed stratification by using an appropriate air cycle will increase the separation efficiency and yield of product in coal washing Jigs.
-
Modelling Jig bed stratification in a pilot scale Baum Jig
Minerals Engineering, 2003Co-Authors: R.x. Rong, G.j. LymanAbstract:Abstract A modelling investigation of Jig bed stratification has been conducted using a large data base developed in a pilot scale Baum Jig. The influence of the Jig operating parameters and water behaviour parameters in the Jigging chamber on the bed stratification were analyzed. It was found that 1. i. Bed stratification is most sensitive to the Jigging time, followed by the frequency of pulsation, air supply pressure and inlet period of the air cycle. 2. ii. A single power function equation was used to effectively represent the relationship between the extent of bed stratification and the Jigging time. 3. iii. The Jig bed stratification is significantly affected by a number of water behaviour parameters in the Jigging chamber. The water pressure above the bed plate has a dominant effect, followed by the water displacement. The velocity and acceleration of the water have insignificant effects on the bed stratification. 4. iv. A model has been developed to describe the extent of bed stratification as a function of the water pressure above the bed plate and the water amplitude in the Jigging chamber. Such a type of model may be a basis for oscillation control of the Jigs.
-
A new energy dissipation theory of Jig bed stratification. Part 1: energy dissipation analysis in a pilot scale baum Jig
International Journal of Mineral Processing, 1993Co-Authors: R.x. Rong, G.j. LymanAbstract:Abstract The dynamic energy dissipation within a Jigging cycle has been mechanically analyzed using data developed in a highly instrumented and controlled pilot scale Baum Jig. The analysis is based on the use of the energy and momentum equations for the fluid. It was found that energy balances on the water in the Jig failed to close because of elastic deformation of the Jig body, rather than inaccuracies in the measurement techniques or failure to account for heat transfer. This deformation problem appears to be common in either pilot Jigs or commercial Jigs. An empirical means of correcting the energy balance was devised and applied to the data with some success. Using this compensation method, the energy balance was improved. The likely energy balance indicates that (i) less than 7% of the energy of the incoming compressed air is expended in the Jig system, (ii) less than 5% of the energy from the compressed air is actually dissipated in the Jig bed, (iii) the kinetic energy input from the hutch water supply is effectively negligible, in comparison to the energy input from the compressed air, and (iv) about 2.5–3.7% of the energy from compressed air is dissipated around the bed plate.
Takayuki Sasamori - One of the best experts on this subject based on the ideXlab platform.
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Simulation and experimental investigation of Jig using semi-rigid cable for S-parameter method
2016 International Symposium on Antennas and Propagation (ISAP), 2016Co-Authors: Ryuta Tozawa, Takayuki Sasamori, Teruo Tobana, Yoji IsotaAbstract:Recently, the S-parameter method using a vector network analyzer was proposed whereby the differential input impedance of a balanced-fed antenna was obtained. To improve measurement accuracy of the S-parameter method, the dependence on the thickness of the semi-rigid cable used for the measurement Jig is obtained from the results of calculations using the FDTD method. Three types of Jigs each made from semi-rigid cables of differing thickness were fabricated, and the input impedance of the dipole antenna are calculated and measured using the S-parameter method. The impedances were compared with those obtained from the available theories by King. Results from the S-parameter method was found that using the thinner diameter coaxial cable can be more accurate measurements.
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A study on Jig using microstrip line for the S-parameter method
2015 IEEE Conference on Antenna Measurements & Applications (CAMA), 2015Co-Authors: Kazuma Endo, Takayuki Sasamori, Teruo Tobana, Yoji IsotaAbstract:Recently, the S-parameter method using a vector network analyzer and a measurement Jig instead of a balun was proposed whereby the differential input impedance of a balanced-fed antenna were obtained. As no balun is used, measuring impedance over a wide frequency bandwidth is now possible. To improve the measurement accuracy of the S-parameter method, the dependence on direction of SMA connectors of the measurement Jig is obtained from the results of calculations using the FDTD method. Two types of Jigs installed the connectors vertically or horizontally are modeled, and the input impedance of the dipole antenna is calculated using the S-parameter method. The input impedances are compared with those obtained from the available theories by King. Results from the S-parameter method roughly agree with the available theories by King, and the influence of direction of the connector is relatively small.
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Measurement Jig using semi-rigid cable for differential impedance measurement by S-parameters
2015 International Symposium on Antennas and Propagation (ISAP), 2015Co-Authors: Ryuta Tozawa, Kazuma Endo, Takayuki Sasamori, Teruo Tobana, Yoji IsotaAbstract:Recently, the S-parameter method using a vector network analyzer and a measurement Jig instead of a balun was proposed whereby the differential input impedance of a balanced-fed antenna were obtained. As no balun is used, measuring impedance over a wide frequency bandwidth is now possible. To improve measurement accuracy of the S-parameter method, the dependence on thickness of the semi-rigid cable used for the measurement Jig is obtained from the results of calculations using the FDTD method. Two types of Jigs each made from semi-rigid cables of differing thickness were fabricated, and the input impedance of the dipole antenna calculated using the S-parameter method. The impedances were compared with those obtained from the available theories by King and calculation results of delta-gap-fed dipole antennas. Results from the S-parameter method agree with the available theories by King and the calculated results of the conventional model of a dipole antenna, over a range of about 6 GHz or less.
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A study on Jig using semi-rigid cable for the S-parameter method
2015 International Workshop on Electromagnetics: Applications and Student Innovation Competition (iWEM), 2015Co-Authors: Ryuta Tozawa, Takayuki Sasamori, Teruo Tobana, Yoji IsotaAbstract:Recently, the S-parameter method using a vector network analyzer was proposed whereby the differential input impedance of a balanced-fed antenna were obtained. To improve measurement accuracy of the S-parameter method, the dependence on thickness of the semi-rigid cable used for the measurement Jig is obtained from the results of calculations using the FDTD method. Three types of Jigs each made from semi-rigid cables of differing thickness were fabricated, and the input impedance of the dipole antenna calculated using the S-parameter method. The impedances were compared with those obtained from the available theories by King. Results from the S-parameter method agree with the available theories by King, over a range of about 5 GHz or less.
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Influence of size of Jig made of microstrip line for S-parameter method
2014 IEEE International Workshop on Electromagnetics (iWEM), 2014Co-Authors: Taiga Yanagibashi, Takayuki Sasamori, Teruo Tobana, Yoji IsotaAbstract:Recently, S-parameter method that is the measuring method of the input impedance of the balanced antenna with a vector network analyzer is proposed. It is a problem of this method that the Jig influences measured value when the measuring frequency in-creases. To remove the influence of the Jig, we have examined compensating method using the ABCD-matrix. In this report, we examine the effect of the size of the Jig on the input impedance using the FDTD method. It is shown that the influence by the size of the Jig is small.