The Experts below are selected from a list of 231 Experts worldwide ranked by ideXlab platform

Dmitry A Stepanenko - One of the best experts on this subject based on the ideXlab platform.

  • modeling of spraying with time dependent Material Feed Rate
    Applied Mathematical Modelling, 2007
    Co-Authors: Dmitry A Stepanenko
    Abstract:

    This paper presents a mathematical model for predicting the thickness of coatings deposited by means of spraying onto rotating parts with circular symmetry, for the case of time-dependent Material Feed Rate. A procedure for calculating the Material Feed Rate control law providing production of coatings with uniform thickness or coatings with a predefined law of thickness variation is developed. The proposed procedure was used to analyze the process of spraying onto the surface of a rotating disc. A Material Feed Rate variation law providing production of uniform coatings and coatings with linear thickness variation is calculated. It is demonstRated that for the first case the optimal law of Material Feed Rate variation is described by a linear function and for the second case it can be successfully approximated by a quadratic function. The proposed calculation technique can be easily used for the case of coatings with a more complex law of thickness variation.

V. Prošek - One of the best experts on this subject based on the ideXlab platform.

  • comparison of two possibilities for mowing machine Material Feed Rate measurement under laboratory conditions
    Research in Agricultural Engineering, 2018
    Co-Authors: F. Kumhála, J Masek, V. Prošek
    Abstract:

    The impact of Materials and conditions (parameters) changes on mowing machine Material Feed Rate measurement accuracy were measured under laboratory conditions. The influence of crop variety, crop maturity and moisture, and intensity of conditioning were tested. The impact of the changing parameters in two measurement methods (based on torque-meter and/or on impact plate) was studied. Eight files of torque-meter and/or impact plate measurement were obtained during our experiments. Statistical analysis was used for data evaluation. Two-sample comparisons were used for torque-meter measurement. It is evident from that evaluation that changing crop variety, crop maturity and intensity of conditioning can have statistically significant influ - ence on the measurement based on torque-meter. For impact plate measurement the analysis of variance was used. It was found out that it is not possible to statistically determine the influence of tested factors on our measurement. Considering these results the Material Feed Rate measurement based on impact plate is better from practical point of view.

  • Development and testing of two methods for the measurement of the mowing machine Feed Rate
    Plant Soil and Environment, 2018
    Co-Authors: F. Kumhála, Milan Kroulík, J Masek, V. Prošek
    Abstract:

    Two methods were developed and tested for the measurement of the mowing machine Material Feed Rate (based on the conditioner power input measured by a torque-meter, and/or on the Material change in momentum measured by a curved impact plate). The measurements carried out in the year 2001 proved that a very good linear relationship existed between the conditioner power input, output frequency of the apparatus measuring the impact force by means of the impact plate, and the Material Feed Rate through the mowing machine. The calculated R-Squared values were about 0.95. In the year 2002, the impacts of Material and condition (parameters) changes on the mowing machine Material Feed Rate measure- ment accuracy were measured under laboratory conditions. It was evident from the statistical evaluation that changing crop variety, crop maturity, and intensity of conditioning can have a statistically significant influence on the measurement based on the torque-meter. As concerns the impact plate measurement, it was found that it is not possible on the basis of our measurements to determine statistically the influence of the factors tested. The sensor of the forage crop Feed Rate can be useful in several applications of precision farming. The infor- mation on the variable Feed Rate of forage can be used for the calculation of the site-specific forage crop yield for a yield map. FlowRate measurement techniques for forage harvest- ers were published previously. Vansichen and De Baer- demaeker (1993) calculated the yield from the torque of the harvester blower. Another possibility is to measure the distance between the Feeder rolls of the harvester (Ehlert and Schmidt 1995). Recently (1996), Auernham- mer and Demmel measured the yield using a nuclear gauge sensor placed in the spout of a forage harvester. A mass flow sensor for a pull type (trailed) forage har- vester based on a reaction of a curved plate in the spout was constructed and tested by Missotten et al. (1997). A site-specific measurement of biomass in growing crops was proposed using a pivoted cylindrical body moving horizontally through a plant population (moving pendulum). The angle of deviation of this pendulum var- ies with the plant properties (e.g. stand density, stem thickness, crop maturity, Material moisture). These mea- surements were performed on cereals (Ehlert and Schmidt 1996). Martel and Savoie (1999) installed four sensors in a forage harvester to measure the Feedroll displacement, the crop impact force against a hinged plate above the blower, the frequency of a capacitance controlled oscil- lator near the end of the spout, and the number of light beam interruptions by forage particles in the spout. Sig- nificant results were obtained from the Feedroll displace- ment and the crop impact force. The linear relationship between the Material Feed Rate and the measured signals was observed with R-Squared coefficient R 2 = 0.95 for the Feedroll displacement, and R 2 = 0.94 for the crop impact force, respectively. The frequency of light beam interrup- tions was not sensitive to the changes in the throughput levels. The frequency of capacitance controlled oscilla- tor increased linearly with the increasing Feed Rate and the slope was related to the moisture content. A number of calibration parameters would be required for the preci- sion work of this system. Demmel et al. (2002) used the principle based on the belt weighing technology for the measurement of the mowing machine Material Feed Rate. This system can be used only for the mowing machines equipped with swather conveyor. The objective of this research was to develop yield- mapping capabilities for modern mowing machines equipped with conditioners. The measurement of the Material Feed Rate is based on the conditioner power in- put as measured by a torque-meter, or on the Material change in momentum measured by a curved impact plate.

  • Feed Rate measurement technique and yield maps creating in fodder plant harvesting
    Research in Agricultural Engineering, 2012
    Co-Authors: P. Miklenda, F. Kumhála, V. Prošek
    Abstract:

    The main aim of this article is to evaluate the possibility of forage yield maps creating based on mowing machine’s conditioner power input measurement. Strong spatial dependence was observed for conditioner power input data. For the data file from Material Feed Rate measurement the medium spatial dependence was calculated. Relatively low value of variograms range is possible to explain by the type of chosen exponential model. Visual displaying of data distribution is done by the maps. These maps were plotted under kriging method. It is possible to observe distributions of higher and smaller values of conditioner power input and Material Feed Rate measurement by this way. Plotted maps are shown in Figures. The correlation coefficients were calculated 0.419 for filtered data. It follows from this evaluation that conditioner power input measurement can be used for the determination of mowing machine Material Feed Rate.

  • Development and testing of two methods for the measurement of the mowing machine Feed Rate
    Plant Soil and Environment, 2011
    Co-Authors: F. Kumhála, Milan Kroulík, J Masek, V. Prošek
    Abstract:

    Two methods were developed and tested for the measurement of the mowing machine Material Feed Rate (based on the conditioner power input measured by a torque-meter, and/or on the Material change in momentum measured by a curved impact plate). The measurements carried out in the year 2001 proved that a very good linear relationship existed between the conditioner power input, output frequency of the apparatus measuring the impact force by means of the impact plate, and the Material Feed Rate through the mowing machine. The calculated R-Squared values were about 0.95. In the year 2002, the impacts of Material and condition (parameters) changes on the mowing machine Material Feed Rate measurement accuracy were measured under laboratory conditions. It was evident from the statistical evaluation that changing crop variety, crop maturity, and intensity of conditioning can have a statistically significant influence on the measurement based on the torque-meter. As concerns the impact plate measurement, it was found that it is not possible on the basis of our measurements to determine statistically the influence of the factors tested. 

  • Development and evaluation of forage yield measure sensors in a mowing-conditioning machine
    Computers and Electronics in Agriculture, 2007
    Co-Authors: F. Kumhála, Milan Kroulík, V. Prošek
    Abstract:

    The main aim of this research was to develop and evaluate sensor system to create forage yield maps on a three-point linkage type of rotary mower-conditioner. The method was based on the mowing machine conditioner's power requirement measured by a torque sensor or on Material change in momentum measured by a curved impact plate. Laboratory measurements were taken to determine the dependence of conditioner power input and signals from the impact plate on Material mass flow. A mixture of grass and alfalfa was used. There was a very good linear relationship between the conditioner's power, impact force from an impact plate, and Material Feed Rate through the mower. The calculated coefficients of determination (R^2) were about 0.95. It was possible to differentiate a Material Feed Rate difference 0.5kgs^-^1 using either method. The effects of Material changes and mower parameters on the accuracy of Feed Rate measurement were then measured. It was observed that the results form torque sensor was influenced by crop variety, maturity and intensity of conditioning. The same influence was not observed for impact plate. A field of 0.54ha was then harvested. A comparison of data from the torque sensor and impact plate with data from hand measurement were made by means of statistical and geostatistical analysis. Conditioner power input measurement and crop impact force were used to create grass yield maps.

Lucian Dascalescu - One of the best experts on this subject based on the ideXlab platform.

  • Factors That Influence the Efficiency of a Propeller-Type Tribocharging Device for Granular Plastics
    IEEE Transactions on Industry Applications, 2017
    Co-Authors: Abdelkader Mekhalef Benhafssa, Lucian Dascalescu, Thami Zeghloul, Sara Messal, Karim Medles
    Abstract:

    This work is focused on the experimental study of a new propeller-type tribocharging device specifically designed to opeRate in conjunction with an electrostatic separator for mixtures of granular insulating Materials. The device consists of two coaxial aluminum propellers rotating in a polyvinyl chloride (PVC) pipe; it has two control variables: the Material Feed-Rate and the rotation speed of the propellers. Virtual instrumentation using LABVIEW software is used for measuring the mass and the electric charge of the tribocharged samples of four types of polymers: polypropylene (PP); high impact polystyrene (HIPS); high-density polyethylene (HDPE); and PVC. In accordance with the sign and the magnitude of the charge/mass ratio, the four polymers are arranged in a triboelectric series, starting from the negative polarity: PVC-HDPE-PP-HIPS. The effectiveness of the tribocharging process is validated by using a free fall electrostatic separator. The best results (purities and recoveries higher than 90%) are obtained in the case of PVC/HIPS granular mixtures.

  • Robust Design and Capability Evaluation of a Tribo-Aerodynamic Charging Process for Fine Particles
    IEEE Transactions on Industry Applications, 2011
    Co-Authors: Lucian Dascalescu, Ciprian Dragan, Mihai Bilici, Adrian Samuila, Youcef Ramdani, Amar Tilmatine
    Abstract:

    Robustness and capability are critical issues for the industrial application of any novel electrostatic process. The aim of this paper is double: show how an experimental design methodology can contribute to assessing the robustness of a given tribo-aerodynamic charging process and validate a procedure for evaluating the capability of two tribo-aerodynamic chargers with respect to the specific requirements of electrostatic separation applications. The results of three fractional factorial experimental designs performed on starch and flour powders, in two devices similar to the triboguns employed for electrostatic powder coating, demonstRate that the tribo-aerodynamic charging is robust with respect to the three main control variables of the process: the injection and vortex pressures of the air in the pneumatic circuit and the Material Feed Rate. The capability indexes computed for both the straight- and spiral-type tribocharges were satisfactory.

  • IAS - Robust Design and Capability Evaluation of a Tribo-Aerodynamic Charging Process for Fine Particles
    2010 IEEE Industry Applications Society Annual Meeting, 2010
    Co-Authors: Lucian Dascalescu, Ciprian Dragan, Mihai Bilici, Youcef Ramdani, A. Samuila, Amar Tilmatine
    Abstract:

    Robustness and capability are critical issues for the industrial application of any novel electrostatic process. The aim of the present work is double: - show how experimental design methodology can contribute to assessing the robustness of a given tribo-aerodynamic charging process; - validate a procedure for evaluating the capability of two tribo-aerodynamic chargers, with respect to the specific requirements of electrostatic separation applications. The results of three fractional factorial experimental designs performed on starch and flour powders, in two devices similar to the tribo-guns employed for electrostatic powder coating, demonstRate that the tribo-aerodynamic charging is robust with respect to the three main control variables of the process: the injection and vortex pressures of the air in the pneumatic circuit, and the Material Feed-Rate. The capability indexes computed for both the straight-type and spiral-type tribo charges were satisfactory.

  • Triboelectric Phenomena in Suction-Type Dilute-Phase Pneumatic Transportation Systems for Granular Plastics
    IEEE Transactions on Industry Applications, 2010
    Co-Authors: Lucian Dascalescu, Ciprian Dragan, Mihai Bilici, Robert Chereches
    Abstract:

    The triboelectric phenomena related to particle-to-particle and particle-to-wall impacts are known to affect the efficiency of suction-type dilute-phase transport systems. The aim of this paper is to evaluate the effects of two factors: the granular Material Feed Rate and the aspirating air flow Rate. The study was conducted with mm-size ABS and HIPS particles, two granular Materials originating from genuine information technology (IT) wastes. The tribocharging processes in polyvinyl chloride (PVC) and aluminum pipes were modeled using the response surface method of experimental design. An induction-type sensor connected to an electrometer has been employed for the measurement of the charge imparted to a well-defined section of the duct, which is equal to the charge transferred to the particles passing through that section of the pneumatic transport system. The measured data were processed by a virtual instrument developed in LabVIEW and then analyzed using commercial software (MODDE 5.0, Umetrics, Sweden). Under the specific conditions of the experiments described in this paper, the charge/mass ratio of the processed particles was found to increase with the aspirating air speed, but was less affected by the granular Material Feed Rate. It was concluded that the appropriate design of the transport system might provide an effective precharging of the granular mixtures of insulating Materials that are processed in standard triboelectrostatic separators.

  • Robust Design and Capability Evaluation of a Tribo-Aerodynamic Charging Process for Fine Particles
    2010 IEEE Industry Applications Society Annual Meeting, 2010
    Co-Authors: Lucian Dascalescu, Ciprian Dragan, Mihai Bilici, Adrian Samuila, Youcef Ramdani, Amar Tilmatine
    Abstract:

    Robustness and capability are critical issues for the industrial application of any novel electrostatic process. The aim of the present work is double: - show how experimental design methodology can contribute to assessing the robustness of a given tribo-aerodynamic charging process; - validate a procedure for evaluating the capability of two tribo-aerodynamic chargers, with respect to the specific requirements of electrostatic separation applications. The results of three fractional factorial experimental designs performed on starch and flour powders, in two devices similar to the tribo-guns employed for electrostatic powder coating, demonstRate that the tribo-aerodynamic charging is robust with respect to the three main control variables of the process: the injection and vortex pressures of the air in the pneumatic circuit, and the Material Feed-Rate. The capability indexes computed for both the straight-type and spiral-type tribo charges were satisfactory.

Václav Prosěk - One of the best experts on this subject based on the ideXlab platform.

  • Laboratory Measurement of Mowing Machine Material Feed Rate
    Precision Agriculture, 2003
    Co-Authors: František Kumhála, Václav Prosěk
    Abstract:

    The main objective of this research was to evaluate two possibilities of Material Feed Rate measurement of modern mowing machines equipped with conditioner. The machines are commonly used for harvest of grasses ( Lolium multiflorum , Dactylus glomerata , Phleum pRatense , etc.), clover ( Trifolium pRatense , etc.), alfalfa ( Medicago sativa ) etc. A mowing machine with finger conditioner was equipped with an electronic measuring unit for the purpose of our measurements. The mowing machine's conditioner shaft was supplied with strain gauges placed on a torque-meter and with a RPM optical sensor counter. Together with torque-meter the mowing machine was equipped with a curved impact plate mounted on the machine's Material output. It was decided to arrange a laboratory measurement to obtain information about the dependence of conditioner power input and signals from the impact plate on Material mass flow. A mixture of grass and alfalfa was used for our measurement. The measurements carried out proved that a very good linear relationship existed between the conditioner's power input, output frequency of the apparatus measuring impact force by means of the impact plate, and Material Feed Rate through the mowing machine. The calculated coefficients of correlation were about 0.95. It is possible to differentiate a Material Feed Rate difference of 0.5kg s^−1 using both methods. This accuracy should be sufficient for practical utilisation such as creating yield maps.

František Kumhála - One of the best experts on this subject based on the ideXlab platform.

  • Laboratory Measurement of Mowing Machine Material Feed Rate
    Precision Agriculture, 2003
    Co-Authors: František Kumhála, Václav Prosěk
    Abstract:

    The main objective of this research was to evaluate two possibilities of Material Feed Rate measurement of modern mowing machines equipped with conditioner. The machines are commonly used for harvest of grasses ( Lolium multiflorum , Dactylus glomerata , Phleum pRatense , etc.), clover ( Trifolium pRatense , etc.), alfalfa ( Medicago sativa ) etc. A mowing machine with finger conditioner was equipped with an electronic measuring unit for the purpose of our measurements. The mowing machine's conditioner shaft was supplied with strain gauges placed on a torque-meter and with a RPM optical sensor counter. Together with torque-meter the mowing machine was equipped with a curved impact plate mounted on the machine's Material output. It was decided to arrange a laboratory measurement to obtain information about the dependence of conditioner power input and signals from the impact plate on Material mass flow. A mixture of grass and alfalfa was used for our measurement. The measurements carried out proved that a very good linear relationship existed between the conditioner's power input, output frequency of the apparatus measuring impact force by means of the impact plate, and Material Feed Rate through the mowing machine. The calculated coefficients of correlation were about 0.95. It is possible to differentiate a Material Feed Rate difference of 0.5kg s^−1 using both methods. This accuracy should be sufficient for practical utilisation such as creating yield maps.

  • Dependence of conditioner power input on mowing machine Material Feed Rate
    Agricultural Engineering International: the CIGR Journal of Scientific Research and Development, 2003
    Co-Authors: František Kumhála
    Abstract:

    The objective of this research was to evaluate the possibility of Material Feed Rate measurement of modern mowing machines equipped with conditioners. The machines are commonly used for harvest of grass, clover, alfalfa, and other forage plants. The method of Material Feed Rate measurement was based on the conditioner power input measurement. A mowing machine with finger conditioner was equipped with an electronic measuring unit for the purpose of our measurements. The mowing machine’s conditioner shaft was supplied with strain gauges sensor torque-meter and with RPM optical sensor counter. Together with torque-meter the mowing machine was equipped with a DGPS receiver for last part of our measurement. In the beginning it was decided to arrange a laboratory measurement to obtain information about the dependence of conditioner power input on Material Feed Rate. A mixture of grass and alfalfa was used for our measurement. Infield measurement was arranged on the base of stationary measurement results as well. Both types of measurement (laboratory and infield) carried out proved that a linear relationship existed between the power input of conditioner and mowing machine Material Feed Rate. Further research relating to mowing machine Feed Rate sensors is planned in order that more accuRate data may be obtained.