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Artykuły w czasopismach na temat "Screw feeder systems"
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Bascone, Davide, Federico Galvanin, Nilay Shah i Salvador Garcia-Munoz. "Modelling and Nonlinear Model Predictive Control of a Twin Screw Feeder". IFAC-PapersOnLine 52, nr 18 (2019): 156–61. http://dx.doi.org/10.1016/j.ifacol.2019.12.223.
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KOVALYOV, Yuri, Sergey PLESHKO i Ivan SUVOROV. "DEVELOPMENT OF IMPROVED ROBOTICS EXTRUDER LOADING SYSTEM". Herald of Khmelnytskyi National University. Technical sciences 317, nr 1 (23.02.2023): 100–104. http://dx.doi.org/10.31891/2307-5732-2023-317-1-100-104.
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The relevance of the study is due to the fact that the loading of granulated polymer material into the working hopper of extruders is mainly carried out manually from bags by production operators. The capacity of working hoppers of extruders is limited due to the fact that with a significant height of the bulk material, an increase in static pressure occurs in the lower layers, which leads to the formation of vaults, uneven supply of polymer into the material cylinder and deterioration of the quality of products. Since the work process of extrusion is continuous and lasts an entire work shift, there is a need to constantly control the filling level of the work hoppers of the extruders. The paper proposes a robotic extruder loading system for the processing of thermoplastic polymer materials into long products (pipes, profiles, films, etc.). The paper proposes a system for loading one or more extruders, which contains a large hopper loaded with raw materials for an entire work shift. From this hopper, the working hopper of the extruder is automatically filled with the help of a screw feeder. Automatic monitoring of the filling status of the hoppers is carried out by a microcontroller with the help of raw material level sensors. The object of research is the process of automatic control of periodic loading of loose materials into technological machines. The subject of the research is a robotic system for loading granulated polymers into the working hoppers of extruders. The purpose of the research is to develop a control system for devices for periodic dosing of granular polymer materials and loading them into working hoppers of limited capacity, which can be used in extruders. The task of the work is an analytical study of the effectiveness of the application of extruder loading systems based on a screw feeder and the development of its design and automatic control scheme. The methodological and theoretical basis of the research are the basic provisions of the theory of automatic control of technological processes, the design of transport equipment for loose media, and the basis of the calculation of machine parts. A scientific novelty is that the work proposed for the first time a device for automatic control of the extruder loading system based on a microcontroller with the possibility of programming the work algorithm. The results of the work can be used to create new systems for controlling the operation of equipment for processing polymer materials and creating new designs. The methodological and theoretical basis of the research are the basic provisions of the theory of automatic control of technological processes, the design of transport equipment for loose media, and the basis of the calculation of machine parts. A scientific novelty is that the work proposed for the first time a device for automatic control of the extruder loading system based on a microcontroller with the possibility of programming the work algorithm. The results of the work can be used to create new systems for controlling the operation of equipment for processing polymer materials and creating new designs.
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Cieślik, Ewelina, Piotr Kwaśniok, Tomasz Rachwał i Piotr Kowalczyk. "DETERMINATION OF CONDENSABLE PARTICULATE MATTER RELEASED BY THE COMBUSTION OF SOLID FUELS IN LOW-POWER BOILERS". Zeszyty Naukowe SGSP 85 (20.03.2023): 81–92. http://dx.doi.org/10.5604/01.3001.0016.3280.
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Despite significant emission control steps in recent decades, damage to air quality caused byparticulate matter with a diameter of 2.5 m or less is now a major concern on a global scale.Condensable particulate matters (CPM) due to their significant contribution to the totalconcentration of particulate matter and their small aerodynamic size (below 2.5 m) are now ofwidespread interest. CPMs produced in low-power solid fuel heating systems can be one of themain components of the total mass of fine particles present in the air we breathe. The operatingconditions of large power installations and small heating boilers differ significantly, therefore itis necessary to adapt the research methods adapted to industrial installations, to the low-powerboilers. In the tests, three fuels were combusted in two low-power boilers (18 kW boiler witha suction feeder and 5class 14 kW boiler with a screw feeder): bituminous coal, pine and sprucewood pellets and cereal straw pellets. An EPA 202 method was used to collect the CPM. Qualitativeand quantitative analyses of inorganic and organic CPM components were performed. Analysesof the inorganic part of the CPM included the determination of metals m.in Na, Ca, Fe, Mg, Al,K, and water-soluble ions, m.in SO42, Na+, K+ and Cl, while analyses of the organic part of theCPM comprised the determination of PAHs. Differences were observed in the amount of CPMgenerated depending on the fuel used and the type of low-power boiler used. CPM emissions arerelatively high and constitute a large part of total particulate matter, so the impact of CPM on theenvironment cannot be ignored and we should pay special attention to its research and control,especially from small solid fuel heating boilers.
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Little, Helen A., Nagendra G. Tanikella, Matthew J. Reich, Matthew J. Fiedler, Samantha L. Snabes i Joshua M. Pearce. "Towards Distributed Recycling with Additive Manufacturing of PET Flake Feedstocks". Materials 13, nr 19 (25.09.2020): 4273. http://dx.doi.org/10.3390/ma13194273.
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This study explores the potential to reach a circular economy for post-consumer Recycled Polyethylene Terephthalate (rPET) packaging and bottles by using it as a Distributed Recycling for Additive Manufacturing (DRAM) feedstock. Specifically, for the first time, rPET water bottle flake is processed using only an open source toolchain with Fused Particle Fabrication (FPF) or Fused Granular Fabrication (FGF) processing rather than first converting it to filament. In this study, first the impact of granulation, sifting, and heating (and their sequential combination) is quantified on the shape and size distribution of the rPET flakes. Then 3D printing tests were performed on the rPET flake with two different feed systems: an external feeder and feed tube augmented with a motorized auger screw, and an extruder-mounted hopper that enables direct 3D printing. Two Gigabot X machines were used, each with the different feed systems, and one without and the latter with extended part cooling. 3D print settings were optimized based on thermal characterization, and both systems were shown to 3D print rPET directly from shredded water bottles. Mechanical testing showed the importance of isolating rPET from moisture and that geometry was important for uniform extrusion. The mechanical strength of 3D-printed parts with FPF and inconsistent flow is lower than optimized fused filament, but adequate for a wide range of applications. Future work is needed to improve consistency and enable water bottles to be used as a widespread DRAM feedstock.
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Dyakonov, O. M., A. A. Litvinko i V. Yu Sereda. "Modeling of the process of heating of chip‑powder dispersions of ferrous metals in the pass‑through muffle furnace of hot briquetting. Message 1". Litiyo i Metallurgiya (FOUNDRY PRODUCTION AND METALLURGY), nr 2 (31.05.2022): 59–67. http://dx.doi.org/10.21122/1683-6065-2022-2-59-67.
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The description of the device and principle of operation of the continuous muffle furnace for hot briquetting of chip‑powder dispersions of ferrous metals is given. A distinctive feature of this device is the presence of two systems of gas‑flame and induction heating, as a result of which the achievement of the specified charge heating temperature is guaranteed with the complete removal of the liquid phase. The oil component of the coolant is used to create a protective hydrocarbon atmosphere that provides non‑oxidizing heating of the metal, as well as to obtain a carbon coating, which, in addition to protective functions, acts as a lubricant in the hot briquetting process. Subsequent combustion of oil vapors in the furnace leads to significant savings in natural gas. A furnace built according to this principle has the smallest dimensions and the highest technical and economic characteristics.The simulation of the chip heating process in the zone of loading into the furnace is carried out. The dependences of the temperature of the chips at the outlet of the screw feeder on the temperature of the flue gases at the inlet for the mass fraction of coolant in the chips of 10 % and various fractions of oil are obtained. It has been established that during the heating of the chips in the loading zone, phase transformations of the coolant do not occur, the charge heating temperature does not exceed 100 °C.
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Kostenko, M. Yu, I. A. Uspensky, I. A. Yukhin i N. V. Lipatov. "Screw Dosing Device for Solid Mineral Fertilizers". Machinery and Equipment for Rural Area, nr 5 (23.05.2023): 16–20. http://dx.doi.org/10.33267/2072-9642-2023-5-16-20.
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The designs of dosing systems used in precision farming technologies are considered, their advantages and disadvantages are identified. On the basis of the analysis carried out, the design of a screw dosing device for centrifugal distributors of solid mineral fertilizers, cultivators-feeders, and seeders of seeders is proposed. Theoretical substantiations of the performance of this device are carried out, the main modes of its operation are determined.
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SATO, Ryuta. "3233 Wear Estimation of Ball Screw and Support Bearing Based on Servo Signals in Feed Drive System". Proceedings of International Conference on Leading Edge Manufacturing in 21st century : LEM21 2011.6 (2011): _3233–1_—_3233–6_. http://dx.doi.org/10.1299/jsmelem.2011.6._3233-1_.
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Czubaszek, Robert, Agnieszka Wysocka-Czubaszek i Piotr Banaszuk. "Importance of Feedstock in a Small-Scale Agricultural Biogas Plant". Energies 15, nr 20 (20.10.2022): 7749. http://dx.doi.org/10.3390/en15207749.
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Although no legal sustainability criteria have been formulated for electricity and heat production from biogas, the sustainability and profitability of large-scale biogas plants which use mainly energy crops is now questioned. Small (farm-size) biogas plants characterized by CHP electrical output in the range between 15 kWel and 99 kWel, operating on agricultural wastes and by-products, seem more suitable; however, the variety of feedstock may be crucial in the proper design and operation of such family biogas plants. This paper aims to present the problems that occurred in small agricultural biogas plants fed with sheep manure (SM), horse manure (HM), and grass-clover silage (GCS). This paper also focuses on analyzing the energy balance and carbon dioxide (CO2) emissions related to four technological solutions (Scenarios 1–4) based on various feedstocks, grinding and feeding systems, and wet/dry fermentation. The biogas plant was originally based on dry fermentation with an organic loading rate ~10.4 kgVS·m−3·d−1, a hydraulic retention time of 16 days, and temperature of 45 °C in the fermentation chamber. The material was shredded and mixed in a mixing device, then the mixture of manures and silage was introduced to the horizontal fermentation chamber through a system of screw feeders. The biogas and the digestate were collected in a reinforced concrete tank. The biogas was sent to the CHP unit of an installed electrical power of 37 kWel, used to produce electricity and recover the heat generated in this process. Scenario 1 is based on the design assumptions used for the biogas plant construction and start-up phase. Scenario 2 includes a new feeding and grinding system, in Scenario 3 the feedstock is limited to SM and HM and wet fermentation is introduced. In Scenario 4, a dry fermentation of SM, HM, and maize silage (MS) is assumed. Avoided CO2 emissions through electricity and heat production from biogas were the highest in the case of Scenarios 1 and 4 (262,764 kg CO2·y−1 and 240,992 kg CO2·y−1) due to high biogas production, and were the lowest in Scenario 3 (7,481,977 kg CO2·y−1) because of the low specific methane yield (SMY) of SM and HM. Nevertheless, in all scenarios, except Scenario 3, CO2 emissions from feedstock preparation and biogas plant operation are much lower than that which can be avoided by replacing the fossil fuel energy for the electricity and heat produced from biogas. Our observations show that a small agricultural biogas plant can be an effective energy source, and can contribute to reducing CO2 emissions only if the appropriate technological assumptions are adopted, and the entire installation is designed correctly.
Rozprawy doktorskie na temat "Screw feeder systems"
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Göbel, Lukáš. "Konstrukční návrh lineární osy pro těžký obráběcí stroj". Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2017. http://www.nusl.cz/ntk/nusl-318778.
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The content of this thesis is the description the various component of the linear feed axis, which are used in heavy duty machine tools. This describes their features, advantages and disadvantages and on these basics, are selected different appropriate design variants. In the second part of this thesis has been drawn up constructional design of these variants. They were subsequently compared and then was chosen the most ideal one for the designed machine, which is heavy machine tool upper gantry type. The work also includes the 3D CAD model of the final version and drawing documentation.
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Kant, Pushpit. "Experimental study of the flow of granular media through a horizontal screw feeder system". Thesis, 2021. https://etd.iisc.ac.in/handle/2005/5981.
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A significant fraction of the materials handled in the chemical, food-processing, and pharmaceutical industries are particulate in nature. Screw feeder systems are often employed in such scenarios to achieve their bulk transport. Several studies have attempted to characterize the overall flow behavior of granular material in screw feeder systems by linking the flow rate with rotational speed and the design parameters of the screw. However, a detailed description of the flow mechanics of granular material in the screw feeder systems is lacking. This thesis describes a detailed experimental study of the flow of dry (cohesionless) granular materials in different helical screws of the different pitch-to-barrel-diameter ratios in the horizontal screw feeder system. We measured stress profiles at different axial positions on the barrel surface, flow rate, and detailed kinematics using the particle tracking velocimetry (PTV) technique for every helical screw. The qualitative behavior of local stress variation with time, measured at different axial positions, on the barrel’s surface remains the same in comparison to the previous study by our group, which relied on the discrete element method (DEM). Stress values decrease from inlet to outlet in every helical screw, which was not observed previously because of the assumptions of a completely filled and fully developed system. The fill level of granular material also decreases from the inlet to the outlet. Combining these results allows us to illustrate gravity’s vital role in reducing the fill level of the granular material in the screw feeder systems, which has been overlooked in previous investigations. Furthermore, the particle tracking velocimetry technique also highlights the crucial dependence of flow mechanics on the pitch-to-barrel-diameter ratio of the helical screw. We observed a similar trend in experimentally obtained flow rate variation with a pitch-to-barrel-diameter ratio of the helical screw compared to the analytical model and DEM simulations obtained from a previous study. We also performed the DEM simulations, where we simulated the entire system by combining the inlet hopper and screw feeder geometry without employing periodic boundary conditions (allowing the system to vary along the axial direction). These DEM simulations confirmed that the fill level decreases along the axial direction in the presence of gravity. We have also performed sensitivity analysis on the coefficient of friction of the screw and barrel surface to see its effect on the flow rate. We observed an increase in flow rate with an increase in the barrel surface’s coefficient of friction and a decrease in flow rate with an increase in the screw surface’s coefficient of friction.International Fine Particle Research Institute (IFPRI)
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HSU, CHE-WEI, i 許哲瑋. "Diagnosis and Monitor of Ball Screw Feed Drive Systems". Thesis, 2016. http://ndltd.ncl.edu.tw/handle/74236153991583279059.
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碩士國立中正大學
機械工程系研究所
104
The purpose of this research is to develop a diagnosis system for ball screw feed drive systems based on monitoring the vibration signal on bearings and ball screw nut. This systems was divided into two parts. In the first part, a novel method in monitoring automatically the preload degradation for a ball screw feed drive system based on principal component analysis(PCA) is presented and its performance is assessed. Four feature from an vibration order spectrum, the actual ball pass order (ABPO), the vibration RMS amplitude at ABPO, the variance of vibration at ABPO and the dispersion of order spectra are proposed to quantify the difference in characteristics between ball screws with and without preloads. By simply attaching an accelerometer on the ball screw nut of a ball screw feed drive system in operation, these four parameters are calculated by using angular velocity Vold-Kalman filtering order tracking (AV VKF-OT). With these four parameters, the prediction accuracy in monitoring the ball screw preload degradation is much improved and can be realized practically. Furthermore, a screw degradation indicator based on the four parameters and PCA is proposed to estimate the ball screw remaining life. Experimental results show that the ball screw remaining life can be estimated with an error less than 15%. In the second part, a bearing diagnosis system using vibration measurements and self-organizing map (SOM) is developed. Several features extracted from the vibration envelope spectra are assessed and ranked using Fisher score in distinguishing a healthy bearing form the faulty one. Experimental results show that with this system the bearing can be monitored and the diagnosis is accurate.
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TSAI, PING-CHUN, i 蔡秉均. "Developments of Preload Monitoring Techniques of Ball Screw Feed Drive Systems". Thesis, 2017. http://ndltd.ncl.edu.tw/handle/14641428688930592446.
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博士國立中正大學
機械工程系研究所
105
Two preload monitoring techniques for ball screw feed drive systems have been developed in this study. The first focuses on the preload monitoring of ball screw and the estimation of the ball screw remaining useful life (RUL). The second is the preload monitoring aiming for linear guideway type (LGT) ball bearings. A novel method in monitoring automatically the preload degradation for a ball screw feed drive system based on self-organizing map (SOM) is presented and its performance is experimentally assessed. Four features from an vibration order spectrum, the actual ball pass order (ABPO), the vibration RMS amplitude at ABPO, the variance of vibration at ABPO and the dispersion of order spectra are proposed to quantify the difference in characteristics between ball screws with and without preloads. By simply attaching an accelerometer on the ball screw nut of a ball screw feed drive system in operation, these four parameters are calculated by using Angular Velocity Vold-Kalman Filtering Order Tracking (AV VKF-OT). With these four parameters, the prediction accuracy in monitoring the ball screw preload degradation is much improved and can be realized practically. Moreover, an algorithm for estimating RUL of ball screw is proposed and then validated through a run-to-failure test which simulates the practical applications. In the second part, a novel method for automatically monitoring the preload degradation of LGT recirculating linear ball bearings is proposed. Simulations and experiments both revealed that the reduction in the natural frequency corresponding to the yawing mode of the worktable is sensitive to and varied linearly with the degradation of the LGT linear bearing preload. By attaching three accelerometers to the worktable of a machine tool and then exciting the worktable with a pulse from the servo motor of a feed drive, this study identified the natural frequencies of the worktable and their corresponding mode shapes by using operational modal analysis (OMA). Among all the natural frequencies obtained by OMA, the natural frequency corresponding to the specific yawing mode of the worktable was extracted using the modal assurance criteria, and the change in the extracted frequency was tracked; thus, the degradation of LGT linear bearing preload could be monitored automatically without exciting the worktable manually.
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Chen, Yen-Chen, i 陳彥辰. "Investigations of Vibration Reduction Techniques for Ball Screw Feed Drive Systems". Thesis, 2017. http://ndltd.ncl.edu.tw/handle/n4r6dr.
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碩士國立中正大學
機械工程系研究所
105
The main purpose of this study is to compare the effectiveness in vibration reduction of a ball screw feed drive system with various vibration reduction techniques. A simplified ball screw feed drive system which consists of the work table, coupler, motor and ball screw shaft has been created. The ball screw shaft is modeled as a structural beam, whereas the other components are modeled equivalently as the combination of spring, damper and mass. The Lagrange method is utilized to the equation of motion and the resulting vibration response is then obtain by the Runge Kutta numerical integration scheme. Several methods such as filter of fixed frequency bandwidth, tracking filter, S-shaped input torque and input shaping are respectively adopted to suppress the work table vibration while the work table is driven by a motor speed control command input. Results show that S-shaped input torque is most effective among all the methods in suppressing the worktable vibration. The ZV (Zero-Vibration) technique from the input shaping method has a good performance for suppressing the pure tone vibration, but poor for multi-tone excitations. The ZV technique is further improved by the modified ZVDD (Zero-Vibration and Second Derivatives) technique, but ZVDD is still not satisfactory for broad band excitations. For filtering out the worktable natural frequency out of the input torque, the adaptive filter performs in reducing the work table vibration better than that of filter of fixed bandwidth due to less distortion in the input torque. However, the filtering techniques are more complicated in implement and perform poorly in reducing the work table vibration as compared to input shaping and S-shaped input.
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CHIANG, WEN-LIN, i 江玟菱. "Developments of Fault Detection Techniques for Ball Screw Feed Drive Systems". Thesis, 2018. http://ndltd.ncl.edu.tw/handle/hsn559.
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碩士國立中正大學
機械工程系研究所
106
The purpose of this research is to develop a diagnosis system for ball screw feed drive systems. The most prone to failure component in the feed drive system is the preload loss, followed by the rolling bearings. Furthermore, the main cause of the bearing failure is the installation error and/or component damage. The thesis consists of three parts. In the first part, several features extracted from the vibration measurements in frequency domain and time domain such as Sample entropy (SE), Root mean square (RMS), Singular spectrum entropy (SSE) and band energy are compared for their effectiveness in diagnosing the ball bearing faults. In the second part, features which could represent the assembly condition of the ball screw feed drive systems such as misalignment using the holographic spectrum are proposed and their effectiveness are also investigated. Finally, all the features aiming to detecting faults of ball screw feed drive systems due to bearing and/or assembly extracted from the vibration measurements are merged using Self-organizing map (SOM) . Whether the ball screw feed drive systems is healthy can be determined by calculating the Mahalanobis distance according to the Minimum quantization error (MQE) from the SOM. The proposed diagnosis technique is validated using the data sets from PHM and NASA. Experimental results show that the ball screw feed drive system can be diagnosed with a reasonable accuracy by this system.
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Tsai, Sheng-Chih, i 蔡勝植. "Thermal Deformation Estimation for a Ball Screw Feed Drive System". Thesis, 2014. http://ndltd.ncl.edu.tw/handle/42s8cb.
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碩士國立臺北科技大學
冷凍空調工程系所
102
The position error of a feed drive system was primarily caused by thermal deformation of a ball screw shaft. A high-speed ball screw system can generate massive heat after long-term operations with greater thermal expansion produced, and thereby unfavorably impact the positioning accuracy of the feed drive mechanism. In this study, we applied the computational approach using the finite element method (FEM) to simulate the thermal expansion process for estimating the deformation of the ball screw system. In the model, the deformation of the ball screw shaft was modeled by a linear elasticity manner given the assumption that the material was elastic, homogeneous, and isotropic. To emulate the reciprocating movements of the nut at the speeds of 20, 40 and 60 m/min corresponding to the screw shaft, we also utilized a three-dimensional unsteady heat conduction equation to determine the steady-state and transient temperature distributions, as well as temperature rises for calculating the thermal deformations of ball screws under operating situations. The analysis adopted the multi-zone heat loads to treat the heat generation sources from the frictions between the nut, bearings and the ball screw shaft. The predictions were compared with the experimental measurement for code validation. The simulated results showed that the countermeasures must be taken to thermally compensate great deterioration of the positioning accuracy due to vast heat production at high rotating speeds of shaft for a ball screw system.
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Chang, Wei-Chen, i 張維真. "To analyse the dynamic response of a ball screw feed drive control system". Thesis, 2019. http://ndltd.ncl.edu.tw/handle/ngmqyr.
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碩士國立彰化師範大學
機電工程學系
107
To build a servo control model of a single-axis ball screw feed system with multi DOF consideration, this thesis establishes the dynamic system equation. The solution of the eigenvalues and eigenvectors shows the feed system consisting of several peaks in different mode shapes. Difference between the frequency response by adding the servo controller loop or not with the servo tuning are discussed. Solution of developed system mode shapes and dynamic frequency response provides an approach for control parameter’s tuning of a CNC machine. Such phase margin, damping effect, frequency bandwidth and associated mode shapes of the system are resolved.
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Li, Meng-Syuan, i 李孟軒. "Research on Vibration Characterizations of Feed Drive Systems and Predicting the Ball Screw Remaining Life". Thesis, 2015. http://ndltd.ncl.edu.tw/handle/55289695284729876197.
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碩士國立中正大學
機械工程學系暨研究所
103
This thesis was divided into two parts. First part focuses on vibration characterizations of feed drive systems of machine tools. The feed drive system consists of ball screw, linear guideway, carriages, and ball bearing. The vibration characteristics of feed drive systems are studied with vibration measurements using accelerometers. Results show that the carriage vibration at the ball pass frequency and its multiples dominates the vibration of the feed drive system at low feed rate (e.g. under 1000 RPM). On the other hand, the ball screw vibration at its own ball pass frequency is the largest in the feed drive system at high rotation speed (e.g. over 1000 RPM). The ball bearing vibration is much small as compared to the ball screw and carriages, so it is hard to detect the bearing vibration especially when it is healthy. The ball bearing vibration can be detected using adaptive noise canceling technique in which the vibration from ball screw to the ball bearing can be reduced. Under this circumstance, the bearing vibration can be detected. However its effectiveness is limited at low feed rate (e.g. under 1400 RPM). In the second part of this thesis, a method based on techniques of ball screw preload detection and principal components analysis in predicting the ball screw remaining life is proposed. With this method, the health of ball screw and its remaining life can be monitored and predicted for machine tools in daily operations.
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Chen, Xiang-Yuan, i 陳詳元. "Investigation of a Ball Screw Feed Drive System Based on Dynamic Modeling for Motion Control". Thesis, 2016. http://ndltd.ncl.edu.tw/handle/23559818440766403446.
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碩士國立彰化師範大學
機電工程學系所
104
To control a single-axis ball screw feed system, this thesis establishes the model first and derives linear equation of motion and solves in frequency response. Solution of the eigenvalues and eigenvectors shows the feed system consists of several peaks in different mode shape frequency responses. Improved particle swarm optimization and hybrid particle swarm optimization are used to tune the gains of PID controller, iterative learning control gain and the bandwidth of zero phase Butterworth filter for reducing the tracking error with repetitions. Simulation results show that the developed controller can effectively lower the RMS tracking error with as iterations. Intrinsic mode functions of empirical mode decomposition are used to demonstrate the mechanism of eliminated tracking error as repetitive learning process. Correlation coefficient of intrinsic mode functions with tracking errors will examine the shift of compensated low-frequency error signals to high-frequency error signals as repetitive learning.
Części książek na temat "Screw feeder systems"
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Hecker, R., D. Vicente i G. Flores. "Mechatronic Sizing of Ball-Screw Feed Drives". W Multibody Mechatronic Systems, 55–65. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-09858-6_6.
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Wang, Fujuan, i Feiyun Zhang. "The Control System of Twin-Screw Feed Extruder". W Advances in Intelligent and Soft Computing, 489–94. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-29387-0_75.
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Zhou, Yong, Fangyu Peng i Bin Li. "Adaptive Notch Filter Control for the Torsion Vibration in Lead-Screw Feed Drive System Based on Neural Network". W Intelligent Robotics and Applications, 803–12. Berlin, Heidelberg: Springer Berlin Heidelberg, 2008. http://dx.doi.org/10.1007/978-3-540-88518-4_86.
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Luo, Liang, i Weimin Zhang. "Electromechanical Co-Simulation for Ball Screw Feed Drive System". W New Trends in Industrial Automation. IntechOpen, 2019. http://dx.doi.org/10.5772/intechopen.80716.
Pełny tekst źródłaStreszczenia konferencji na temat "Screw feeder systems"
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Murphy, Michael J. "Failure Analysis and Design Improvement Considerations of Wood Screw Conveyors". W ASME 1999 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1999. http://dx.doi.org/10.1115/imece1999-0646.
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Abstract Screw conveyors are a well know and well recognized means of moving material from one point to another. The wood products industry uses screw conveyors in the transportation of their raw materials throughout the mills. These screw conveyors are typically categorized by the common name of “wood screws”. Failures of wood screws are usually related to the imposed operating loads. Many wood screws are subjected to abnormally high loads that are sometimes not anticipated in the original design. Wood screws are also subjected to the effects of fatigue due to rotation. An unconventional new wood screw design was used at one location to address a condition of reoccurring failures and increase the reliability of the mill’s feeder system. This new design deviated from the popular method of fabricating the screw from one continuous piece of seamless pipe. Instead the new screw was fabricated by welding together pipe of two different wall thicknesses. The new screw design used one piece of thicker wall thickness pipe in the center one-third section and used two pieces of the original wall thickness pipe at each end. This design modification increased the section modulus and decreased the deflection of the screw at the center, but did not alter the existing drive and support arrangement of the screw. The welds between the different wall thickness sections of pipe were located at the quarter points which are away from the highly stressed areas of the center section of the screw.
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Rigacci, Massimiliano, Ryuta Sato i Keiichi Shirase. "Experimental Analysis of the Power Consumption of Feed Drive Systems Driven by Ball-Screw". W JSME 2020 Conference on Leading Edge Manufacturing/Materials and Processing. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/lemp2020-8523.
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Abstract This study presents an experimental analysis of the power consumption of feed drive systems. The relevant system components from the power consumption point of view are the motor, bearings, ball-screw and linear guides. The electric power consumption of the motor is investigated experimentally acquiring the inputted voltage and the current; then, through the study of its efficiency, it is shown that the electric efficiency of the motor heavily depends on the angular velocity and the supplied torque. The mechanical power consumption of each component of the feed drive is investigated showing that the component that affects the most the consumption is the ball-screw. Thus, four kind of ball-screws differing for the lead of the screw and the preload of screw-nut are investigated; it is clarified the relation between the mechanical power consumption and several system characteristics such as the lead of the screw, the preload condition, and the table working velocity. Finally, the advantages and disadvantages of each mechanical configuration of the feed drive are discussed, emphasizing that the most important driven factor of the power consumption is the angular velocity due to the trade-off between the motor efficiency and the mechanical power loss of the system components cause friction.
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Matsui, Shota, Nobutoshi Ozaki, Toshiki Hirogaki, Eiichi Aoyama i Ryo Matsuda. "Investigation of Cutting Force in Screw Cutting by Three Axis Controlling Helical Interpolate With a Wireless Communication Tool Holder System". W JSME 2020 Conference on Leading Edge Manufacturing/Materials and Processing. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/lemp2020-8540.
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Abstract In recent years, the movement of machine tools including 5-axis control machining centers (5 MC) and turning centers has progressed to enable machining at high speeds and high degrees of accuracy. The accuracy of simultaneous three-axis movement at very high feed speeds has increased significantly. Specifically, with the development of control technologies for these machine tools featuring simultaneous three-axis control, the accuracy of helical interpolation motion at high feed speed has achieved a sufficient level to perform processes such as screw cutting with a thread mill tool. Boring machining and pocket machining for difficult-to-cut materials are processing methods that employ helical interpolation movements with an endmill tool, and it is becoming a promising technology in light of recent advancements. Therefore, we looked at screw cutting with a thread mill tool and proposed a novel monitoring method to improve the accuracy of machining the screw by deriving the radial force of thread cutting from three components — two forces in the X and Y directions and torque around the Z axis — using a piezoelectric dynamometer. In this study, we also investigated the accuracy of machining the screw when the pilot hole and screw were drilled at the same time as well as the accuracy when the pilot hole is drilled beforehand. In addition, we monitored the cutting data and X-Y feed motions using a wireless holder and CNC information to construct a smart manufacturing method for machining screws using helical interpolation. As a result, the proposed monitoring method is effective at improving the accuracy of machining screws from various work materials using helical interpolation motion of a thread mill tool.
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G. Giorges, Aklilu T., i Marc G. Zanghi. "The Flow Dynamics of a Partially Filled Horizontal Helical Screw Reactor (PFHSR)". W ASME 2016 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/imece2016-66947.
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Enclosed helical screw systems are used as screw feeders and conveyers for handling dry bulk solids. The design of such systems is based on the feed load, the properties of the bulk solid and the shape and parameters of the screw features. Similar designs are used as extruders in manufacturing deformable materials with help of pressure and a combination of pressure and temperature. Furthermore, identical arrangements also are used in mixing and transporting viscous fluid. The screw pitch, shape and size are some of the factors that determine the flow dynamics between the center screw (core shaft) and the outer cylinder (barrel), and also are found to determine dry bulk solids transport. The transport processes of helical screw systems for bulk solids, heat exchangers, passive mixers and high viscosity fluids are widely published. However, there are limited studies available that have investigated horizontally placed partially filled screw reactors. In the food processing industry, partially filled horizontal helical screw reactors (PFHSR) are used to transport and mix fluids and slurries and also to chill food products. Thus, understanding the flow dynamics of PFHSRs will lead to the design of effective PFHSR systems as well as open new areas of application. Our main objective is to understand the flow dynamics of a PFHSR system. The test system is a closed end horizontal cylinder with a screw agitator in the middle. The tests are designed to replicate the current industrial process and to investigate the flow dynamics change due to flow path and different screw rotational speeds. Water-based rheoscopic fluid is used to visualize the flow profile, and several replications of the same test were conducted. The PFHSR system length, outside cylinder diameter, screw (auger) pitch and clearance were fixed for all tests. The rotational speed and the flow return path were varied. The flow return path varied by opening and closing the auger’s core. The flow results indicate the annular flow between the auger core and outside cylinder is affected by the rotational speed and the flow return rate related to flow path. The open core region simulates the flow condition where the flow is pumped into and out of the PFHSR system. On the other hand, the closed core region simulates the effect of pressure (slip) flow as well as the implication of slip flow in mixing. The flow process has been studied by observing the flow pattern from different viewpoints. The experimental results are presented by relating the flow field with a Reynolds number (Re) that is defined using the rheoscopic fluid viscosity, the auger rotational speed and diameter. The bulk fluid flow is found to be the result of the moving surfaces and other boundary conditions in addition to the slip-flow through the flight and barrel clearance. Vortices appear at the trailing side of the screw flight and also show a periodic pattern. The flow fields observed from both open and closed core show the flow profile, as well as the flow type significantly affected by the flow path.
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Yoshioka, Hayato, Shunya Saito, Jun Kato, Hidenori Shinno, Shunsuke Goto i Nobumitsu Hori. "Improvement of Thermal Deformation in a Newly Developed Steel CFRP Composite Ball Screw". W JSME 2020 Conference on Leading Edge Manufacturing/Materials and Processing. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/lemp2020-8587.
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Abstract Machine tools are required to realize high precision and high efficiency machining by various industry sectors. A machine tool has some driving systems to position cutting tools and workpieces, and hence driving units are required high speed and precision positioning. However, high speed feed motion causes thermal deformation due to generated heat at friction surfaces such as guideway, feed screw, and bearings, it deteriorates positioning accuracy of driving units. Thermal deformation of a ball screw is one of large error factors of lower positioning accuracy, and a cooling system for reducing thermal deformation is installed into machine tools. Since the cooling system needs additional cost and space in machining systems, a new method for minimizing thermal deformation is required. In this study, a new structure of ball screw is proposed in order to meet these requirements. A new ball screw which has a core pipe made of CFRP was developed. CFRP is one of composite materials which have light weight and low thermal expansion. This paper presents analysis results of a simplified FEM model of the ball screw and the basic experimental results of the developed ball screw. These results confirmed that the proposed ball screw was applied to high performance positioning system in machine tools.
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Zaeh, Michael F., i Thomas Oertli. "Finite Element Formulation of Pre-Stressed Ball Screw Drives". W ASME 7th Biennial Conference on Engineering Systems Design and Analysis. ASMEDC, 2004. http://dx.doi.org/10.1115/esda2004-58281.
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In this paper a stiffness matrix of the ball screw drive element is formulated as an approach for substitute modeling of the stiffness conditions at the ball-groove contacts in the engagement region of the ball screw and the nut. A scalar spring model is proposed, for the coupling between the ball screw and the nut with respect to both the stiffness properties and the screw degree of freedom of the ball screw drive. This permits combined modelling and vibration analysis of entire frame structures including ball screw feed drive systems by means of integral finite element models. The feed axis of a feed drives test station serves here as an example for demonstration and for verification of the modelling approach. A reduced order representation of the finite element model is used for simulation of the feed axis in control, the results of which match corresponding measurement results obtained from the test station.
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Hayashi, Akio, Ryuta Sato, Ryoma Iwase, Masayuki Hashimoto i Keiichi Shirase. "Measurement and Simulation of Electric Power Consumption of Feed Drive Systems". W ASME 2013 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/imece2013-63518.
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In this study, in order to investigate the power consumption of feed drive system, a mathematical model to predict for the electric power consumption of feed drive systems is proposed by using the single-axis experimental apparatus. This can be driven by either of ball screw or linear motor and it is possible to change the mechanical properties of the machine such as grease viscosity of the table. The power consumption is simulated by proposed simulation method based on the mathematical model of feed drive system and the simulated results are compared with the measured results of the experimental apparatus to confirm the validity of the simulated results. In addition, it is clarified that the energy usages of the feed drive system. The energy losses of the feed drive system are divided into the loss of viscous friction, coulomb’s friction, servo amplifier, and motor. These energy losses are calculated by the proposed model. Then, it is investigated that the influence of the velocity and the friction to the power consumption of feed drive system experimentally. As the results, it is confirmed that proposed simulation method can accurately predict the power consumption of the ball-screw feed drive system. It is also clarified that the friction energy loss of ball-screw drive is larger than one of linear motor drive, and the friction characteristics of linear guides influences the power consumption of linear motor drive system.
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Xu, Zhezhu, Qi Zhang i Sungki Lyu. "Improvement of Positioning Error on a Ball Screw Drive System by Liquid-Cooling". W ASME 2011 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/detc2011-47280.
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The demand for higher productivity and tight part tolerances requires machine tools to have faster and more accurate feed drive system. As tried and tested technology, ball screw drive systems are still used in majority of machine tools due to their low cost and high stiffness. A high speed ball screw drive system natually generates more heat and results in greater positioning error, adversely affecting the accuracy of machined parts. In order to estimate the positioning error of the ball screw system and effectiveness of the liquid-cooling system, all possible heat gain-loss sources were analyzed and calculated as calculation factors. The following paper also presents degree of positioning error improvement which employed circulation liquid-cooling system and forced liquid-cooling system. Comparing the experimental results and the forcasts, it shows that sensational cooling performance and high consistency of reality and prediction are displayed.
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Choi, Young H., Jin H. Hong i Sung H. Jang. "A Study on the Feed Rate Optimization of a Ball Screw Feed Drive System for Minimum Vibrations". W ASME 2005 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2005. http://dx.doi.org/10.1115/detc2005-85473.
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In order to prevent machine tool feed slide system from transient vibrations during operation, machine tool designers usually adopt some typical design solutions; box-in-box typed feed slides, optimizing moving body for minimum weight and dynamic compliance, and so on. Despite all efforts for optimizing design, a feed drive system may experience severe transient vibrations during high-speed operation if its feed-rate control is not suitable. A rough feed-rate curve having discontinuity in its acceleration profile causes serious vibrations in the feed slides system. This paper presents a feed-rate optimization of a ball screw driven machine tool feed slide system for its minimum vibrations. A ball screw feed drive system was mathematically modeled as a 6-degree-of-freedom lumped parameter model. Then, a feed-rate optimization of the system was carried out for minimum vibrations. The main idea of the feed-rate optimization is to find out the most appropriate smooth acceleration profile having jerk continuity. A genetic algorithm, G.A., was used in this feed rate optimization.
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Marquez-Garcia, Carlos E., Jesus Lopez-Gomez, Fermin Martinez-Solis, M. A. Diozcora Vargas-Trevino, Sergio Vergara-Limon i Victor M. Velazquez-Aguilar. "FPGA-based accuracy mechatronics of a feed-drive system with ball screw". W 2021 18th International Conference on Electrical Engineering, Computing Science and Automatic Control (CCE). IEEE, 2021. http://dx.doi.org/10.1109/cce53527.2021.9633104.
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