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The New Measurement and Calculation Method for Dynamic Parameters of DC Motor Based on dSPACE System
Online since: August 2012
Authors: Ren He, Qiang Li, Wei Chen
The permanent magnet DC motor EMG30 was produced by Devantech Ltd (Robot Electronics) in England, which has incremental encoder sensor and gear reduction ratio of 30.
(6) Here τi denotes the electromagnetic time constant with different PWM duty cycle values, which can be calculated by current data from ControlDesk with mat format, R is the resistance.
The change rate of angular velocity can be calculated by the ControlDesk software’s export data.
Fig.7 is the comparison output angular velocity of DC motor with simulation and practical measurement results, the latter data is obtained with HIL platform based on dSPACE system.
Fig.6 Simulation model of DC motor with cascade control Fig.7 Dynamic respond of DC motor under step input of voltage From the results we can see that the simulation curve agrees with experimental data very well, which identifies that the new measurement and calculation method has simple, rapid and feasible for dynamic parameters of DC motor under the premise of meeting the requirement of simulation accuracy.
(6) Here τi denotes the electromagnetic time constant with different PWM duty cycle values, which can be calculated by current data from ControlDesk with mat format, R is the resistance.
The change rate of angular velocity can be calculated by the ControlDesk software’s export data.
Fig.7 is the comparison output angular velocity of DC motor with simulation and practical measurement results, the latter data is obtained with HIL platform based on dSPACE system.
Fig.6 Simulation model of DC motor with cascade control Fig.7 Dynamic respond of DC motor under step input of voltage From the results we can see that the simulation curve agrees with experimental data very well, which identifies that the new measurement and calculation method has simple, rapid and feasible for dynamic parameters of DC motor under the premise of meeting the requirement of simulation accuracy.
Online since: November 2012
Authors: Ferri M.H.Aliabadi, Z. Sharif-Khodaei, M. Ghajari
To provide training data, 80 impacts were carried out at random locations.
It can be seen that the contact forces have very different responses and by training the same network with small and large mass impact data, it can result in high error values due to regularisation of the ANN.
In this work an attempt has been made to categorise the impact from sensor data and according to the impact type, the appropriate ANN will be used for detecting max contact force.
The sensor data was divided into training, validation and test sets.
There is 12% reduction in the MSE of the approximated max contact force.
It can be seen that the contact forces have very different responses and by training the same network with small and large mass impact data, it can result in high error values due to regularisation of the ANN.
In this work an attempt has been made to categorise the impact from sensor data and according to the impact type, the appropriate ANN will be used for detecting max contact force.
The sensor data was divided into training, validation and test sets.
There is 12% reduction in the MSE of the approximated max contact force.
Online since: December 2010
Authors: Yung Cheng Hsieh, Hung Sheng Lin
Cloud computing not only provides substantial benefits for printing industry customers, but also for printing companies themselves through the Infrastructure as a service (IaaS) concept: averting the need for printing firms to develop their own hardware and software solutions, deploying leased virtual host platform network space to provide Web-to-Print service, achieving time and manpower reductions for maintenance and IT management, reducing thresholds for printers to engage in Web-to-Print , while ensuring data stability and security.
Research procedures and results (A) Document collection and analysis In this study, we collect and analyze data regarding sales volume and service provided through domestic and international digital printing websites.
(B) Questionnaire survey This study relied on the quantitative research technique of document analysis to construct the questionnaire and four dimensions, namely, information flow, business processes, cash flow and logistics, and information management systems, to ensure valid empirical data, via questionnaire surveys to current Taiwan printers, and after completing the pre-test data were collected and analyzed, permitting correction of the instrument as indicated, with the final questionnaire edited and arranged, and finally in-depth analysis of the results.
Research procedures and results (A) Document collection and analysis In this study, we collect and analyze data regarding sales volume and service provided through domestic and international digital printing websites.
(B) Questionnaire survey This study relied on the quantitative research technique of document analysis to construct the questionnaire and four dimensions, namely, information flow, business processes, cash flow and logistics, and information management systems, to ensure valid empirical data, via questionnaire surveys to current Taiwan printers, and after completing the pre-test data were collected and analyzed, permitting correction of the instrument as indicated, with the final questionnaire edited and arranged, and finally in-depth analysis of the results.
Online since: October 2014
Authors: Dănuţ Mihăilescu, Bogdan Georgescu, Marius Cornel Gheonea
Experimental data at welding in joint spot cold pressure of some flow-harden aluminum tins with the thickness of 5 mm, high values of ε
Table 1.
Experimental data at welding in joint spot cold pressure of some flow-harden aluminum tins with the thickness of 5 mm, low values of ε d [mm] ε [%] F [N] τ [MPa] d [mm] ε [%] F [N] τ [MPa] 4 6 8 10 12 14 75.0 74.0 73.0 72.2 71.3 71.0 3.600 5.550 7.200 9.000 10.500 12.000 211 217 211 211 206 202 4 6 8 10 12 14 84.5 83.0 81.6 80.0 79.3 78.6 3.150 5.100 6.900 8.550 10.200 11.700 250 270 274 272 270 266 Before evidences breaking, has been measured the thickness of the joint spots (with a precision of 0.1 mm) in order to establish the realized degree of deformation (ε).
In Fig. 6 can be seen the graph given by the relation F = f(d) according to data from Table 1a.
The increasing of the degree of deformation (by adding a spacer under the pin) at the same diameter of the pin, has taken to a quite small reduction (until 10%) of the breaking force (Table 2).
As entry data we use the mechanical characteristics of the base metal.
Experimental data at welding in joint spot cold pressure of some flow-harden aluminum tins with the thickness of 5 mm, low values of ε d [mm] ε [%] F [N] τ [MPa] d [mm] ε [%] F [N] τ [MPa] 4 6 8 10 12 14 75.0 74.0 73.0 72.2 71.3 71.0 3.600 5.550 7.200 9.000 10.500 12.000 211 217 211 211 206 202 4 6 8 10 12 14 84.5 83.0 81.6 80.0 79.3 78.6 3.150 5.100 6.900 8.550 10.200 11.700 250 270 274 272 270 266 Before evidences breaking, has been measured the thickness of the joint spots (with a precision of 0.1 mm) in order to establish the realized degree of deformation (ε).
In Fig. 6 can be seen the graph given by the relation F = f(d) according to data from Table 1a.
The increasing of the degree of deformation (by adding a spacer under the pin) at the same diameter of the pin, has taken to a quite small reduction (until 10%) of the breaking force (Table 2).
As entry data we use the mechanical characteristics of the base metal.
Online since: November 2015
Authors: Michael Schlömann, Cindy Klink, Juliane Heim, Birgit Daus, Sebastian Eisen, Simone Schopf
Bio-hydrometallugy can offer a solution to meet the twin objectives of resource recycling and pollution reduction.
This has been confirmed by XRF analyses of the fly ash, showing that zinc, sulfur and lead are major elements (data not shown).
This indicates co-precipitation of antimony with iron, which is emphasized by analysis of the leaching residue (data not shown).
In all samples the dominating species are pentavalent antimony ions (data not shown).
An increase of the redox potential within 15 days and decrease of the pH in the same period (data not shown) indicated a more rapid dissolution of minerals in comparison to bioleaching in shaking flasks.
This has been confirmed by XRF analyses of the fly ash, showing that zinc, sulfur and lead are major elements (data not shown).
This indicates co-precipitation of antimony with iron, which is emphasized by analysis of the leaching residue (data not shown).
In all samples the dominating species are pentavalent antimony ions (data not shown).
An increase of the redox potential within 15 days and decrease of the pH in the same period (data not shown) indicated a more rapid dissolution of minerals in comparison to bioleaching in shaking flasks.
Online since: October 2018
Authors: I.R. Kuzeev, E.A. Naumkin, S.A. Pankratiev, R.R. Tlyasheva
The obtained data was processed by means of program Sony Sound Forge 7.
Particularly significant reduction of life capability was observed on maximum frequency of 12463 Hz: by 1.6 times.
In the result we obtained data provided in figure 4.
Processing of experimental data provided in fig. 6 allowed us obtaining the following formula of adjustment factor: k=1/(0.84+0.15(sin((0.12·f)-28.77))), (2) where f is frequency of vibrations, Hz.
Solid curve constructed on the basis of experimental data and curve (2) with the application of k factor, calculated by equation (2) Acknowledgements Researches are conducted in Ufa State Petroleum Technological University as a part of developing of initiative fundamental scientific project according to state order to higher education for 2017-2019 (№ 9.7294.2017 / CU of 31.01.2017).
Particularly significant reduction of life capability was observed on maximum frequency of 12463 Hz: by 1.6 times.
In the result we obtained data provided in figure 4.
Processing of experimental data provided in fig. 6 allowed us obtaining the following formula of adjustment factor: k=1/(0.84+0.15(sin((0.12·f)-28.77))), (2) where f is frequency of vibrations, Hz.
Solid curve constructed on the basis of experimental data and curve (2) with the application of k factor, calculated by equation (2) Acknowledgements Researches are conducted in Ufa State Petroleum Technological University as a part of developing of initiative fundamental scientific project according to state order to higher education for 2017-2019 (№ 9.7294.2017 / CU of 31.01.2017).
Online since: December 2006
Authors: Young Sam Ham, Jai Sung Hong, Young Nam Paik, Kyung Yup Lee
Especially, left and right positions of the axle box are worn out so often to cause the reduction of
maintenance period and the lowering of the running performance.
- Physical property study on current wear plates with hardness and wear tests - Data acquisition on hardness and wear properties according to heat processing and surface processing - New material selection for plates based on consideration of current materials physical properties and surface processing 3.2 Tests 3.2.1 Property test for high frequency tempering current wear plates Current wear plates are mainly made of carbon steel (SM45C) and spring steel (SPS5) which underwent high frequency tempering with surface hardness HRc 55~50.
Therefore, it is important to gather basic data from current materials before finding out new materials.
In this test, based on KS B 0863, the hardness of a material is measured by Rockwell test. 3.2.3 Data acquisition of hardness and wear properties Generally the harder a material is, the stronger against wear it is.
Analysis of the new type wear plate for maintenance 4.1 Demands for new material The selection of new materials for wear plates can be done solely based on above tested data.
- Physical property study on current wear plates with hardness and wear tests - Data acquisition on hardness and wear properties according to heat processing and surface processing - New material selection for plates based on consideration of current materials physical properties and surface processing 3.2 Tests 3.2.1 Property test for high frequency tempering current wear plates Current wear plates are mainly made of carbon steel (SM45C) and spring steel (SPS5) which underwent high frequency tempering with surface hardness HRc 55~50.
Therefore, it is important to gather basic data from current materials before finding out new materials.
In this test, based on KS B 0863, the hardness of a material is measured by Rockwell test. 3.2.3 Data acquisition of hardness and wear properties Generally the harder a material is, the stronger against wear it is.
Analysis of the new type wear plate for maintenance 4.1 Demands for new material The selection of new materials for wear plates can be done solely based on above tested data.
Online since: September 2013
Authors: Marcin Apostoł, Andrzej Jurkiewicz, Łukasz Rajda
This would allow for a fully automatic reduction of leakage by increasing the clenching of SMA wires under the influence of the voltage supplied to the seal or under the influence of self-heating of the working fluid and the transfer of the heat generated on the coils of wire.
Dominik: Advanced controlling of the prototype of SMA linear actuator, Diffusion and Defect Data – Solid State Data.
Dominik: The SMA wires application in the Braille Monitor, Diffusion and Defect Data – Solid State Data.
Dominik: Advanced controlling of the prototype of SMA linear actuator, Diffusion and Defect Data – Solid State Data.
Dominik: The SMA wires application in the Braille Monitor, Diffusion and Defect Data – Solid State Data.
Online since: September 2014
Authors: Zakaria Man, Anis Shuib, Zahid Majeed, Nur Kamila Ramli, Nurlidia Mansor
Beer’s Law equation was applied in this experiment to analyse the absorbance data obtained from UV-VIS spectrophotometer.
The standard calibration curve using ammonium stock solution was prepared and data was recorded at 640 nm as illustrated in Fig. 1.
Figure 1: Standard calibration curve for NH3 Figure 2: NH3 conc. vs incubation time at wavelength, 640 nm The absorbance data obtained for determining the urease activity is varies from wavelength 190 nm to 800 nm.
However, based on NH3 standard calibration graph, absorbance data recorded at 640 nm are only required for this inhibitory study.
With increase of incubation time, shows reduction in NH3 release from the reaction.
The standard calibration curve using ammonium stock solution was prepared and data was recorded at 640 nm as illustrated in Fig. 1.
Figure 1: Standard calibration curve for NH3 Figure 2: NH3 conc. vs incubation time at wavelength, 640 nm The absorbance data obtained for determining the urease activity is varies from wavelength 190 nm to 800 nm.
However, based on NH3 standard calibration graph, absorbance data recorded at 640 nm are only required for this inhibitory study.
With increase of incubation time, shows reduction in NH3 release from the reaction.
Online since: June 2013
Authors: Fan Shuo Meng, Ai Guo Chen
It has easy to carry, easy to use, intelligent characteristics to realize the function of real-time detection, inquiring historical data and communication with computer.
(4) Be able to inquire historical data
Then the positive electrode which had the catalytic properties came to start oxidation reaction, at the same time, the negative electrode started reduction reaction.
The flash memory can be reprogrammed even in-circuit, providing non-volatile data storage, and also allowing field upgrades of the 8051 firmware [3].
When the key inquire pressed, the system will display the historical data on the LCD.
(4) Be able to inquire historical data
Then the positive electrode which had the catalytic properties came to start oxidation reaction, at the same time, the negative electrode started reduction reaction.
The flash memory can be reprogrammed even in-circuit, providing non-volatile data storage, and also allowing field upgrades of the 8051 firmware [3].
When the key inquire pressed, the system will display the historical data on the LCD.