To see the other types of publications on this topic, follow the link: Stepping motors – Computer programs.
Journal articles on the topic 'Stepping motors – Computer programs'
Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles
Consult the top 47 journal articles for your research on the topic 'Stepping motors – Computer programs.'
Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.
You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.
Browse journal articles on a wide variety of disciplines and organise your bibliography correctly.
1
Aggarwal, R., and P. P. Acarnley. "Computer-aided selection of variable-reluctance stepping motors." IEE Proceedings B Electric Power Applications 137, no. 4 (1990): 223. http://dx.doi.org/10.1049/ip-b.1990.0026.
Full text
2
Dong, Yan, Kai Jing, Hexu Sun, and Yi Zheng. "Discrete Current Control Strategy of Permanent Magnet Synchronous Motors." Journal of Applied Mathematics 2013 (2013): 1–9. http://dx.doi.org/10.1155/2013/525014.
Full textAbstract:
A control strategy of permanent magnet synchronous motors (PMSMs), which is different from the traditional vector control (VC) and direct torque control (DTC), is proposed. Firstly, the circular rotating magnetic field is analyzed on the simplified model and discredited into stepping magnetic field. The stepping magnetomotive force will drive the rotor to run as the stepping motor. Secondly, the stator current orientation is used to build the control model instead of rotor flux orientation. Then, the discrete current control strategy is set and adopted in positioning control. Three methods of the strategy are simulated in computer and tested on the experiment platform of PMSM. The control precision is also verified through the experiment.
3
OETSCH, JOHANNES, JÖRG PÜHRER, and HANS TOMPITS. "Stepwise debugging of answer-set programs." Theory and Practice of Logic Programming 18, no. 1 (October 17, 2017): 30–80. http://dx.doi.org/10.1017/s1471068417000217.
Full textAbstract:
AbstractWe introduce astepping methodologyfor answer-set programming (ASP) that allows for debugging answer-set programs and is based on the stepwise application of rules. Similar to debugging in imperative languages, where the behaviour of a program is observed during a step-by-step execution, stepping for ASP allows for observing the effects that rule applications have in the computation of an answer set. While the approach is inspired from debugging in imperative programming, it is conceptually different to stepping in other paradigms due to non-determinism and declarativity that are inherent to ASP. In particular, unlike statements in an imperative program that are executed following a strict control flow, there is no predetermined order in which to consider rules in ASP during a computation. In our approach, the user is free to decide which rule to consider active in the next step following his or her intuition. This way, one can focus on interesting parts of the debugging search space. Bugs are detected during stepping by revealing differences between the actual semantics of the program and the expectations of the user. As a solid formal basis for stepping, we develop a framework of computations for answer-set programs. For fully supporting different solver languages, we build our framework on an abstract ASP language that is sufficiently general to capture different solver languages. To this end, we make use of abstract constraints as an established abstraction for popular language constructs such as aggregates. Stepping has been implemented inSeaLion, an integrated development environment for ASP. We illustrate stepping using an example scenario and discuss the stepping plugin ofSeaLion. Moreover, we elaborate on methodological aspects and the embedding of stepping in the ASP development process.
4
Stevens, John K., and Judy Trogadis. "Cytoskeletal control of neuronal geometry: A serial EM analysis." Proceedings, annual meeting, Electron Microscopy Society of America 46 (1988): 24–25. http://dx.doi.org/10.1017/s0424820100102201.
Full textAbstract:
The cytoskeleton plays a direct role in controlling neurite shape. To quantitatively study both the three dimensional shape and the sub-micron structure of the cytoskeleton requires complete serial reconstruction at the Electron Microscopic level. We have devised a computer reconstruction system specifically for this purpose.The system uses a 35mm film copy of 3.25 x 4.00 inch EM negative as the data source. The film is placed into a high speed film transport (15 frames/second), which is mounted on a X,Y and rotation stage controlled by stepping motors. The 35mm film is viewed through a stepping motor controlled zoom lens mounted on a high resolution (1119 x 1024) video camera. A high resolution frame grabber controlled by the computer can store one complete frame. Thus, the live image and a stored image may be displayed alternately on a high resolution monitor. Finally, a graphics overlay and mouse connected to the computer can be used to align successive sections via the stepping motors, as well as to trace the outlines of a profile, or of a microtubule.
5
Lindner, Lars, Oleg Sergiyenko, Julio C. Rodríguez-Quiñonez, Moises Rivas-Lopez, Daniel Hernandez-Balbuena, Wendy Flores-Fuentes, Fabian Natanael Murrieta-Rico, and Vera Tyrsa. "Mobile robot vision system using continuous laser scanning for industrial application." Industrial Robot: An International Journal 43, no. 4 (June 20, 2016): 360–69. http://dx.doi.org/10.1108/ir-01-2016-0048.
Full textAbstract:
Purpose The purpose of this paper is the presentation and research of a novel robot vision system, which uses laser dynamic triangulation, to determine three-dimensional (3D) coordinates of an observed object. The previously used physical operation principle of discontinuous scanning method is substituted by continuous method. Thereby applications become possible that were previously limited by this discretization. Design/methodology/approach The previously used prototype No. 2, which uses stepping motors to realize a discontinuous laser scan, was substituted by the new developed prototype No. 3, which contains servomotors, to achieve a continuous laser scan. The new prototype possesses only half the width and turns out to be significantly smaller and therefore lighter than the old one. Furthermore, no transmissions are used, which reduce the systematic error of laser positioning and increase the system reliability. Findings By using a continuous laser scan method instead of discontinuous laser scan method, dead zones in the laser scanner field can be eliminated. Thereby, also by changing the physical operation principle, the implementation of applications is allowed, which previously was limited by the fixed step size or by the object distance under observation. By using servomotors instead of stepping motors, also a significant reduced positioning time can be accomplished maintaining the relative positioning error less than 1 per cent. Originality/value The originality is based on the substitution of the physical operation principle of discontinuous by continuous laser scan. The previously used stepping motors discretized the laser scanner field and thereby produced dead zones, where 3D coordinates cannot be detected. These stepping motors were substituted by servomotors to revoke these disadvantages and provide a continuous laser scan, where dead zones in the field of view get eliminated and the step response of the laser scanner accelerated.
6
Szelag, Wojciech, Andrzej Demenko, and Lech Nowak. "TIME‐STEPPING FINITE ELEMENT METHOD IN DESIGNING OF PERMANENT MAGNET SYNCHRONOUS MOTORS." COMPEL - The international journal for computation and mathematics in electrical and electronic engineering 14, no. 4 (April 1995): 107–11. http://dx.doi.org/10.1108/eb051924.
Full text
7
Wu, Li, Bing Yang Zhang, Yan Li Jia, and Jian Guo. "Development Of Automatic Sampling System Based On ARM." Applied Mechanics and Materials 66-68 (July 2011): 2266–71. http://dx.doi.org/10.4028/www.scientific.net/amm.66-68.2266.
Full textAbstract:
Aim at the demand of analytical automation of sampling pretreatment, we designed an automatic sampling system which used ARM9 for microprocessor. The system designed in this paper is based on the processor of S3C2440 and the Windows CE operating system, and completed the work of programming in Visual Studio 2005. It uses stepping motors and precision pump as implementing agencies, and TA8435H as the stepping motor’s driver, uses LCD touch screen as human-computer interface. We accomplished software development in a customized Windows CE6.0 operating system. The paper mainly makes the detailed introduction to this system’s hardware platform design and software design based on WINCE embedded operation system.
8
Milecki, Andrzej, and Jarosław Ortmann. "Electrohydraulic linear actuator with two stepping motors controlled by overshoot-free algorithm." Mechanical Systems and Signal Processing 96 (November 2017): 45–57. http://dx.doi.org/10.1016/j.ymssp.2017.03.042.
Full text
9
Chen, W. D., K. L. Yung, and K. W. Cheng. "A learning scheme for low-speed precision tracking control of hybrid stepping motors." IEEE/ASME Transactions on Mechatronics 11, no. 3 (June 2006): 362–65. http://dx.doi.org/10.1109/tmech.2006.875574.
Full text
10
Goldtzvik, Yonathan, and D. Thirumalai. "Multiscale Coarse-Grained Model for the Stepping of Molecular Motors with Application to Kinesin." Journal of Chemical Theory and Computation 17, no. 8 (July 12, 2021): 5358–68. http://dx.doi.org/10.1021/acs.jctc.1c00317.
Full text
11
Cetin, E., and F. Daldaban. "Reducing Torque Ripples of the Axial Flux PM Motors by Magnet Stepping and Shifting." Engineering, Technology & Applied Science Research 8, no. 1 (February 20, 2018): 2385–88. http://dx.doi.org/10.48084/etasr.1700.
Full textAbstract:
Higher efficiency on electric machines is the research goal of many studies. An example is the axial flux permanent magnet machines. These machines have some advantages like their watt/kg efficiency and torque density. This study aims to develop the performance characteristics of the axial flux permanent magnet machines. A new rotor magnet poles design in axial flux machines is suggested to mitigate the torque ripples. The method of stepping and shifting of the magnets is used. Two different designs are compared to verify the proposed approach. 3D finite element analysis is used for simulations. Torque ripple and back electromotive force waveforms are obtained from computer analysis. As a conclusion, the suggested method is found to be useable and mitigates the torque ripples. In addition to that, back EMF waveforms are turned to sinusoidal by the suggested design.
12
Hiraoka, Nobuaki, and Toshiro Noritsugu. "Reaction Force Control of a Parallel Biwheel Vehicle Driven with a Stepping Motor." Journal of Robotics and Mechatronics 11, no. 5 (October 20, 1999): 356–61. http://dx.doi.org/10.20965/jrm.1999.p0356.
Full textAbstract:
Reaction force control of a parallel biwheel vehicle (PBV) driven with two stepping motors in open loop mode is used for holding and transporting objects. The inverted pendulum type unstable PBV's attitude is regulated by a discrete time sliding mode controller. Reaction force is generated by contacting and leaning the PBV body toward objects and reaction force magnitude is controlled by a fuzzy logic controller whose nonlinear control achieves a quick, calm response. For a square wave force reference up to 1 N, the PBV quickly follows a reference signal without overshoot and maintains a steady reaction force. Control performance is discussed in detail aid compared to PI force control. The two PBVs cooperatively transport an object.
13
Briskin, E. S., Ya V. Kalinin, and M. V. Miroshkina. "Energy Efficient Modes of the Motion of Mobile Robots with Orthogonal Stepping Motors when Overcoming Obstacles." Journal of Computer and Systems Sciences International 59, no. 2 (March 2020): 209–16. http://dx.doi.org/10.1134/s1064230720010037.
Full text
14
Isobe, Daishin, Noriyuki Hori, Shin Kawai, Keisuke Yagi, and Triet Nguyen-Van. "Digital Control of a Stepping Motor for Eliminating Rotation Speed Fluctuations Using Adaptive Gains." Electronics 10, no. 11 (June 2, 2021): 1335. http://dx.doi.org/10.3390/electronics10111335.
Full textAbstract:
Nowadays, stepping motors are usually used as precise actuators in various new scientific fields, such as syringe pumps, blood analyzers, and bio-3D printers. Controlling rotation of the stepping motor without speed fluctuation under no-load conditions plays an important role in improving the accuracy of the machine’s drive. This paper proposes a digital control method for a five-phase hybrid stepping motor. The proposed controller includes an original control loop and a PI adaptive integration gain control loop. The original digital control loop is redesigned from the analog controller by using the direct PIM method. The PI adaptive control loop is added to the original control loop in a parallel way to remove a steady deviation of the motor and suppress a physical saturation factor inside the plant. Lyapunov stability theory is used to prove a stability condition of the PI regulator gains. Experimental results show that the proposed controller can suppress the chattering caused by the switching structure and gives performances as good as that of the commercial analog controller in a high rotation speed range without fluctuation.
15
Tao, Dajun, Kai Liang Zhou, Fei Lv, Qingpeng Dou, Jianxiao Wu, Yutian Sun, and Jibin Zou. "Magnetic Field Characteristics and Stator Core Losses of High-Speed Permanent Magnet Synchronous Motors." Energies 13, no. 3 (January 22, 2020): 535. http://dx.doi.org/10.3390/en13030535.
Full textAbstract:
This study focuses on the core losses in the stator region of high-speed permanent magnet synchronous motors, magnetic field characteristics in the load region, and variations in iron losses caused by changes in these areas. A two-pole 120 kW high-speed permanent magnet synchronous motor is used as the object of study, and a two-dimensional transient electromagnetic field-variable load circuit combined calculation model is established. Based on electromagnetic field theory, the electromagnetic field of the high-speed permanent magnet synchronous motor under multi-load conditions is calculated using the time-stepping finite element method. The magnetic field distribution of the high-speed permanent magnet synchronous motor under a multi-load condition is obtained, and the variations in iron core losses in different parts of the motor under multi-load conditions are further analyzed. The calculation results show that most of the stator iron core losses are dissipated in the stator yoke. The stator yoke iron loss under the no-load condition exceeds 70% of the total stator iron core loss. The stator yoke iron loss under rated operation conditions exceeds 50% of the total stator iron core loss. The stator loss under rated load operation conditions is higher than that under no-load operation. These observations are sufficient to demonstrate that the running status of high-speed motors is closely related to the stator iron losses, which have significance in determining the reasonable yoke structure of high-speed and high-power motors and the cooling methods of motor stators.
16
Xie, Guo, and Chen. "A Generalized Kinetic Model for Coupling between Stepping and ATP Hydrolysis of Kinesin Molecular Motors." International Journal of Molecular Sciences 20, no. 19 (October 3, 2019): 4911. http://dx.doi.org/10.3390/ijms20194911.
Full textAbstract:
A general kinetic model is presented for the chemomechanical coupling of dimeric kinesin molecular motors with and without extension of their neck linkers (NLs). A peculiar feature of the model is that the rate constants of ATPase activity of a kinesin head are independent of the strain on its NL, implying that the heads of the wild-type kinesin dimer and the mutant with extension of its NLs have the same force-independent rate constants of the ATPase activity. Based on the model, an analytical theory is presented on the force dependence of the dynamics of kinesin dimers with and without extension of their NLs at saturating ATP. With only a few adjustable parameters, diverse available single molecule data on the dynamics of various kinesin dimers, such as wild-type kinesin-1, kinesin-1 with mutated residues in the NLs, kinesin-1 with extension of the NLs and wild-type kinesin-2, under varying force and ATP concentration, can be reproduced very well. Additionally, we compare the power production among different kinesin dimers, showing that the mutation in the NLs reduces the power production and the extension of the NLs further reduces the power production.
17
Haisen, Zhao, Liu Xiaofang, Cui Xueshen, and Luo Yingli. "Time-stepping finite element analysis on the influence of rotational flux on local core losses of AC electrical machines." COMPEL: The International Journal for Computation and Mathematics in Electrical and Electronic Engineering 33, no. 1/2 (December 20, 2013): 126–36. http://dx.doi.org/10.1108/compel-10-2012-0253.
Full textAbstract:
Purpose – The purpose of the paper is to study the influence of rotational flux on local core losses of the motors, which is difficult to distinguish the iron losses caused by rotational flux in certain electric machines through experiment. Therefore, time-stepping finite element method (T-S FEM) is used to consider the rotational flux and to predict the local core losses. Design/methodology/approach – Time-stepping finite element method. Findings – It is found that, in stator side, rotational flux mainly exists in tooth root and yoke area near the bottom of stator slot, those area is about 45 percent of total stator core area; in rotor side, due to slot harmonic field, the rotational flux mainly exists in the tip of tooth. Originality/value – Through analyzing the magnetization characteristics at different positions in stator and rotor cores by T-S FEM, the influence of rotational flux on local core losses of AC electric machines is studied.
18
Ko, Hyeongseok, and James Cremer. "VRLOCO: Real-Time Human Locomotion from Positional Input Streams." Presence: Teleoperators and Virtual Environments 5, no. 4 (January 1996): 367–80. http://dx.doi.org/10.1162/pres.1996.5.4.367.
Full textAbstract:
Virtual reality applications, especially in entertainment and training, require environments populated with multiple interacting humans. Whether the virtual humans are controlled by real people or by computer programs, a large portion of their activity will involve locomotion. This paper presents VRLOCO, a “locomotion engine” designed to meet the locomotion requirements of virtual environments. First, VRLOCO is broadly capable; it includes five locomotion primitives—walking, running, lateral stepping, turning around, and backward stepping—and can blend smoothly between primitives during transitions. Second, locomotion control in VRLOCO is simple; controllers drive the locomotion by supplying streams of intuitive positional inputs—desired body center position and facing direction—over time. Finally, VRLOCO is responsive and efficient; it generates locomotion on-line, processing user- or program-generated control inputs and producing new frames at rates greater than 30 Hz. Technically, VRLOCO combines a method for generalizing prototypical locomotion data with algorithms for determining locomotion mode and blending between different modes. The effectiveness of the approach has been tested using several locomotion controllers—programs representing autonomous agents, interactive graphic user interfaces, and a VR input device consisting of a stationary bicycle equipped with optical encoders and a microcontroller.
19
Dems, Maria, Krzysztof Komeza, Slawomir Wiak, and Sara Fernández Coya. "Influence of the closing rotor slots on the additional losses in the induction motor." COMPEL: The International Journal for Computation and Mathematics in Electrical and Electronic Engineering 34, no. 2 (March 2, 2015): 531–49. http://dx.doi.org/10.1108/compel-07-2014-0183.
Full textAbstract:
Purpose – The purpose of this paper is to present the distribution of the magnetic field and additional losses analysis of the induction motors (IM) with opened and closed rotor slots. Design/methodology/approach – In the field-circuit approach the distribution and changes of magnetic flux density in the motor are computed using a time-stepping finite element method. The additional losses in each element are evaluated at different frequencies. Findings – An approximate analytical formulation is derived for rapid losses computation confirmed by the results of field-circuit method. For high-voltage motors due to the size ratios of the core and relatively deep stator and rotor slots major role in causing loss of higher harmonics play a fundamental slot harmonics. Higher harmonics order bigger than 100 cause only small part of total higher harmonics core losses. Closed rotor slots construction influenced significantly on no-load losses mainly due to reduction of losses at slot upper part. For nominal load condition that influence is not so strong according to the saturation of slot tips by rotor leakage flux. Nevertheless, core losses at load are several times higher as at no-load. Research limitations/implications – In future research authors will take into account motors feed from PWM inverter, working in the frequency range up to 400 Hz. Practical implications – The results of investigation will be used in more detailed design of IMs especially for motors with closed rotor slots. Originality/value – The methods presented in the paper was not used before. Also results of additional losses in the motor core calculation, especially according motors with closed slots at no load and load conditions are new.
20
Wang, Lixin, Jianhua Yang, Michael Workman, and Peng-Jun Wan. "A Framework to Test Resistency of Detection Algorithms for Stepping-Stone Intrusion on Time-Jittering Manipulation." Wireless Communications and Mobile Computing 2021 (August 6, 2021): 1–8. http://dx.doi.org/10.1155/2021/1807509.
Full textAbstract:
Hackers on the Internet usually send attacking packets using compromised hosts, called stepping-stones, in order to avoid being detected and caught. With stepping-stone attacks, an intruder remotely logins these stepping-stones using programs like SSH or telnet, uses a chain of Internet hosts as relay machines, and then sends the attacking packets. A great number of detection approaches have been developed for stepping-stone intrusion (SSI) in the literature. Many of these existing detection methods worked effectively only when session manipulation by intruders is not present. When the session is manipulated by attackers, there are few known effective detection methods for SSI. It is important to know whether a detection algorithm for SSI is resistant on session manipulation by attackers. For session manipulation with chaff perturbation, software tools such as Scapy can be used to inject meaningless packets into a data stream. However, to the best of our knowledge, there are no existing effective tools or efficient algorithms to produce time-jittered network traffic that can be used to test whether an SSI detection method is resistant on intruders’ time-jittering manipulation. In this paper, we propose a framework to test resistency of detection algorithms for SSI on time-jittering manipulation. Our proposed framework can be used to test whether an existing or new SSI detection method is resistant on session manipulation by intruders with time-jittering.
21
Billatos, Samir B. "A practical application of fluid power systems in manufacturing." Robotica 11, no. 5 (September 1993): 475–82. http://dx.doi.org/10.1017/s0263574700017021.
Full textAbstract:
SUMMARYFluid power is one of the vast fields and its applications in manufacturing are not used for many real-time problems though its capabilities are known. One such application is fluid power for robotic systems. More specifically, in this study, a new hydraulic system is developed for use in actuating a robotic gripper. Electric motors were found unsatisfactory due to their poor power to weight ratio. Hydraulics were attempted using a master slave hydraulic system. Powering and positioning was done on the master cylinder, while the remote slave cylinder followed the motion. The control of the master cylinder was done with a ground based stepping motor and lead screw mechanism. Small hoses ran to the gripper based slave cylinder, which copied the motions.
22
Ai, Chengliu, Christopher H. T. Lee, James L. Kirtley, Yuanfeng Huang, Haifeng Wang, and Zhiwei Zhang. "A Hybrid Methodology for Analyzing the Performance of Induction Motors with Efficiency Improvement by Specific Commercial Measures." Energies 12, no. 23 (November 26, 2019): 4497. http://dx.doi.org/10.3390/en12234497.
Full textAbstract:
This paper presents a hybrid methodology to analyze the commercial measures of changing stator windings and adjusting air gap length to upgrade efficiency of typical three-phase direct-on-line induction motors with die-cast copper rotor (DCR). The calculation is carried out through combining the time-stepping and time-harmonic finite element analysis (FEA) and the circuit equivalent circuit model. Typical full-load performance of stator windings with different air gap lengths are computed by MATLAB invoking the 2D transient and eddy current field analysis in ANSYS/MAXWELL. Then, MATLAB scripts about post-processing of the FEA results are used to obtain the full-load running performance including the loss distribution and circulating current. The MATLAB scripts of circuit model built based on the FEA results is used to compare the overload and starting performance. After that, four stators with the four windings and three DCRs with different air gap of an 11 kW motor are fabricated and tested to validate the calculations. By comparing results from both calculations and measurements, it is shown that the factors of stator windings and air gap length can effectively improve the efficiency of the 11 kW DCR induction motor without the addition of extra materials. The motor with the 11/12 pitch Y-Δ series winding and 0.6 mm air gap has the best performance, in terms of efficiency, overloading capability and starting performance. Its efficiency can increase from 90% to the highest 92.35% by sole adjustment of stator winding and air gap length.
23
Wang, Wei, Shen Jie Jia, Shu Chong Liu, and Hui Yan Wang. "A Computer-Aided Approach to Undergraduate Engineering Education." Key Engineering Materials 474-476 (April 2011): 1931–34. http://dx.doi.org/10.4028/www.scientific.net/kem.474-476.1931.
Full textAbstract:
Despite the quality of engineers that still universities are forming, the existing system for educating engineers must change, provides the courses for engineering educators, and a large experience developing and implementing engineering programs, the engineering education research team has decided to develop and to offer a graduation level program for engineers dedicated to education. Through the application of computer-mediated communication educators or instructional designers in the field of engineering with an opportunity to share the ideas and experience of innovating curriculum and instructional methods of engineering education. In this paper, we briefly review the status of engineering education in China. Additionally, we provide details of how these concepts can be used in an educational model, a learning system is also believed to be the stepping stone to one that generates and rewards “active, independent, self-directed learning” for students to gather and assess data rigorously and critically.
24
Gray, Charles M., Baldwin Goodell, and Alex Lear. "Multichannel Micromanipulator and Chamber System for Recording Multineuronal Activity in Alert, Non-Human Primates." Journal of Neurophysiology 98, no. 1 (July 2007): 527–36. http://dx.doi.org/10.1152/jn.00259.2007.
Full textAbstract:
We describe the design and performance of an electromechanical system for conducting multineuron recording experiments in alert non-human primates. The system is based on a simple design, consisting of a microdrive, control electronics, software, and a unique type of recording chamber. The microdrive consists of an aluminum frame, a set of eight linear actuators driven by computer-controlled miniature stepping motors, and two printed circuit boards (PCBs) that provide connectivity to the electrodes and the control electronics. The control circuitry is structured around an Atmel RISC-based microcontroller, which sends commands to as many as eight motor control cards, each capable of controlling eight motors. The microcontroller is programmed in C and uses serial communication to interface with a host computer. The graphical user interface for sending commands is written in C and runs on a conventional personal computer. The recording chamber is low in profile, mounts within a circular craniotomy, and incorporates a removable internal sleeve. A replaceable Sylastic membrane can be stretched across the bottom opening of the sleeve to provide a watertight seal between the cranial cavity and the external environment. This greatly reduces the susceptibility to infection, nearly eliminates the need for routine cleaning, and permits repeated introduction of electrodes into the brain at the same sites while maintaining the watertight seal. The system is reliable, easy to use, and has several advantages over other commercially available systems with similar capabilities.
25
Carbonieri, Matteo, and Nicola Bianchi. "A Complete and Fast Analysis Procedure for Three-Phase Induction Motors Using Finite Element, Considering Skewing and Iron Losses." Applied Sciences 11, no. 5 (March 9, 2021): 2428. http://dx.doi.org/10.3390/app11052428.
Full textAbstract:
This paper deals with a complete finite-element analysis procedure for squirrel cage induction motors, including the presence of skewing and the iron losses evaluation. The machine is analyzed performing only magneto-static finite element analyses. Saturation phenomena are carefully considered in any operating condition, avoiding long time-stepping analyses. The synergy between analytical and finite element model leads to a rapid and precise estimation of the rotor induced current, saving computational time. Furthermore, the procedure proposed in this paper allows the motor performance to be directly derived, without the preliminary knowledge of the machine equivalent circuit. In order to complete the analysis, skewing effect is included, using the 2-D multi-slice technique, based on static simulations. Experimental tests are carried out and reported in order to verify analysis results.
26
Rizzo, M., A. Savini, and J. Turowski. "Effect of the non-linearity of demagnetization curves on the torque of hybrid stepping motors with permanent magnets in slots." COMPEL: The International Journal for Computation and Mathematics in Electrical and Electronic Engineering 17, no. 3 (1998): 318–23. http://dx.doi.org/10.1108/03321649810693474.
Full text
27
Xin, Ke, Wei Zuo, and Jing Feng Zhi. "Automatic Testing Equipment and Experiments Based on the Quantitative Shadow Method for Measuring Sub-Nanometer Deformations on Aspheric Surface." Key Engineering Materials 375-376 (March 2008): 608–13. http://dx.doi.org/10.4028/www.scientific.net/kem.375-376.608.
Full textAbstract:
A novel quantitative shadow testing equipment is presented based on the digital imageprocessing technique for characterizing local surface deformations on optical surface. Two magnetic stepping motors control the positions of the knife-edge for cutting the wave-front reflected back from the aspheric surface separately. At each position of the knife-edge blocking the image on the focal plane, it is recorded and analyzed by an image-processing set-up behind the knife-edge under computer control. Based on a group of images recorded, the analysis of local slopes is performed by picking up characteristics of illumination levels. Further the relationship between the changes of illumination level and deformations on surface is built on the principle of Fourier Optics. The results of tests approve that the method is effective on determining the characteristics of two parabolic surfaces using magnetorheological finishing.
28
Jesadaporn, Panas, Yudh Jayapravitra, and Piyapong Khumrin. "134 Reliability and Usability of Step Sensing System on Gait Speed and Stepping Accuracy Measurement: A Preliminary Evaluation." Age and Ageing 48, Supplement_4 (December 2019): iv28—iv33. http://dx.doi.org/10.1093/ageing/afz164.134.
Full textAbstract:
Abstract Background Falls are the most common cause of injury among older people in Thailand. However, there are no established falls prevention programs in our community. Telehealth is one of the strategies to overcome this unmet need. We have developed the Step Sensing System (SSS) for measuring gait speed and stepping accuracy of multi target stepping task (MTST). This system comprises of the footstep sensing modules, controller box and analyzing computer. SSS records each footfall and compares with an assignment for each walking trail. The results will be sent to a cloud storage which are accessible by web-based and mobile applications. By using this technology, we are able to remotely access falls risk and monitor MTST performance in older people. Methods We placed footstep sensing modules under a 6-metre mat, then asked a 32-year-old healthy woman to walk across the mat for 4 trails: usual-pace, faster-pace, usual-pace with 1 assigned target and usual-pace with 2 assigned targets on an alternating sequence. We evaluated the system reliability by comparing gait speed and stepping accuracy on 3rd and 4th trails with video recorded by Intel RealsenseTM Depth Camera (model D415). Results SSS and video recording has excellent correlation for gait speed and stepping accuracy measurement (intraclass correlation coefficient [ICC] > 0.99, p value < 0.001). The user satisfaction measured by the System Usability Scale was 70/100. Conclusions SSS demonstrated promising results on gait speed and stepping accuracy measurement in controlled environment. For the next step, we plan to increase ability of gait measurement on various parameters and perform the validity assessment in community setting.
29
Miková, Ľubica, Michal Kelemen, Vladislav Maxim, and Jaromír Jezný. "Design of Control of DC Motor." Applied Mechanics and Materials 611 (August 2014): 325–31. http://dx.doi.org/10.4028/www.scientific.net/amm.611.325.
Full textAbstract:
In current practice the use of mathematical models is substantially widespread, reason being the recent increase in development of programs for this purpose, with the option of model simulation in a virtual environment, proportional to the evolving computer technology. The article contains a mathematical model created using Matlab program. The simulation results are compared with scientific literature that addresses DC motors and evaluated. For simplicity, a graphical interface was created.
30
Winarno, Agustinus, Sus Lasiyah, Benidiktus Tulung Prayoga, Ignatius Aris Hendaryanto, and Fransiskus Xaverius Sukidjo. "Development of Accuracy Evaluation Method for Open Loop Educational CNC Milling Machine." Jurnal Rekayasa Mesin 12, no. 1 (May 31, 2021): 217. http://dx.doi.org/10.21776/ub.jrm.2021.012.01.23.
Full textAbstract:
<p>The open-loop educational computer numerical control (CNC) milling machine requires accuracy verification in order to ensure its accuracy and functionality. In this paper, the new verification method is proposed based on the length measurement using the fringe counting of He-Ne laser interferometry. The ideal translation length is defined by the number of electric pulses generated by the micro-stepping driver, while the actual length is measured using He-Ne laser interferometry. In the experimental process, the data of the fringe pattern of the He-Ne laser and the number of electric pulses which drive the stepper motors were simultaneously acquired using an oscilloscope. Hence, the data has been analyzed to obtain the ideal and actual lengths by using an in-house program developed in Python. By comparing the actual translation and ideal length, the accuracy of the educational CNC milling machine has been evaluated to be 50 µm for the length up to 200 mm.</p>
31
Yansuo, Zhou, Leng Yonggang, Lu Wenqi, Li Yu, Li Qingmian, and Wu Di. "Research on a High-Speed and Heavy-Duty Closed-Loop Drive System of a Two-Phase Hybrid Stepping Motor Based on a Hybrid Controller." Wireless Communications and Mobile Computing 2021 (August 20, 2021): 1–13. http://dx.doi.org/10.1155/2021/2515820.
Full textAbstract:
Low load capacity and poor positioning accuracy of stepper motors in high-speed operation are currently two of the bottlenecks that limit their application in high-speed and heavy-duty drive applications. To solve this problem, a hybrid controller is proposed for the high-speed heavy-duty closed-loop stepper motor driving system, which includes two core contents. First, for the position control, a hybrid controller based on position error for open-loop/closed-loop automatic switching-combined spatial current given amplitude and angle automatic adjustment is proposed. Secondly, an advanced angle compensation strategy based on error-integrated feedforward is adopted to compensate for the electrical angle of the combined space current vector. To verify the effectiveness of the proposed method, theoretical analysis and system development as well as testing are carried out. Compared with the traditional open-loop drive system, results show that the maximum operating speed and maximum torque of the newly developed drive system based on the proposed method are improved by 50% and 81.25%, respectively. And at the same set speed and position, the response speed is faster and the accuracy of the steady-state process is higher. In the case of setting higher running speed and load torque, the drive system also maintains high-precision operation.
32
Maia, Rafael de Oliveira, Francisco Assis da Silva, Mário Augusto Pazoti, Leandro Luiz de Almeida, and Danillo Roberto Pereira. "DESENVOLVIMENTO DE UM DISPOSITIVO PARA APOIO AO ENSINO DE COMPUTAÇÃO E ROBÓTICA." Colloquium Exactarum 6, no. 2 (August 29, 2014): 71–85. http://dx.doi.org/10.5747/ce.2014.v06.n2.e077.
Full textAbstract:
In this work we proposed the development of an alternative device as a motivating element to learn computer science and robotics using the Raspberry PI and Arduino boards. The connections of all hardware used to build the device called Betabot are presented and are also reported the technologies used for programming the Betabot. An environment for writing programs to run at Betabot was developed. With this environment it is possible to write programs in the Python programming language, using libraries with functions specific to the device. With the Betabot using a webcam and through image processing search for patterns like faces, circles, squares and colors. The device also has functions to move servos and motors, and capture values returned by some kindsof sensors connected to communication ports. From this work, it was possible to develop a device that is easy to be manipulated and programmed, which can be used to support the teaching of computer science and robotics.
33
Szántó, Attila, and Gusztáv Áron Szíki. "Review of Modern Vehicle Powertrains and Their Modelling and Simulation in MATLAB/Simulink." International Journal of Engineering and Management Sciences 5, no. 2 (April 15, 2020): 232–50. http://dx.doi.org/10.21791/ijems.2020.2.29.
Full textAbstract:
Thanks to technological advances and environmental standards, as well as changing usage patterns, road vehicles are constantly developing. Electric and hybrid vehicles are playing an increasingly important role in today’s road transport. The most significant changes are probably in the powertrain of vehicles. The efficiency of internal combustion engines increases while their emissions continue to decline. In addition, high performance electric motors, batteries and even fuel cells play an increasingly important role in hybrid and electric vehicles. In this publication, we review the drive systems of current modern vehicles and the types and characteristics of their major components. We also review the available models and computer programs for their simulation, focusing mainly on MATLAB/Simulink applications. Based on this, we can develop our own models and simulation programs which will help us to perform different driving dynamics simulations and to compare the performance, dynamic and energetic characteristics of these powertrains and their components to each other.
34
Van Cuong, Ngo, and Lidiia I. Kovernikova. "Analysis of the influence of non-sinusoidal and unbalanced network modes on induction motors." E3S Web of Conferences 289 (2021): 01002. http://dx.doi.org/10.1051/e3sconf/202128901002.
Full textAbstract:
The parameters of electrical network modes do not correspond the requirements GOST 32144-2013 of Russian and the National technical regulation of Vietnam. In real operating conditions in electrical networks in non-sinusoidal and unbalanced modes there are harmonic components of voltages and currents as well as voltages and currents of negative sequence. They cause additional losses of active power, which leads to additional heating and causes premature aging of the insulation, and as the result, the reduction in the service life of induction motors. Currently, we see that the process of formation of intelligent electrical power systems is underway. Systems for continuous monitoring of power quality indices and parameters of electrical systems modes are being developed. These systems can be supplemented with programs for calculating characteristics that issue the warning when the unfavorable influence of the parameters of non-sinusoidal and unbalanced modes is detected on various electrical equipment of both electrical power systems and consumers of electrical energy. The paper provides an overview of the characteristics used to analyze, assess and predict the influence of poor power quality associated with non-sinusoidal and unbalanced of currents and voltages on induction motors. A computer program was developed to calculate these characteristics. The program was used to study the influence of non-sinusoidal and unbalanced modes on the induction motors of the coal sorting plant of the Vietnamese company “Cua Ong-Vinacomin”.
35
Pei, Yan Ming, Kai Li, and Yun Hong Liu. "A New Method to Control and Monitor a 6 D.O.F. Robot Arm." Applied Mechanics and Materials 236-237 (November 2012): 297–301. http://dx.doi.org/10.4028/www.scientific.net/amm.236-237.297.
Full textAbstract:
This paper mainly talks about the design of a controlling and monitoring system of the robot arm based on FPGA. The robot arm has 6 DOFs (Degree of Freedom). Every joint was driven by a servo motor. These servo motors were located as the finger, the wrist, the three arms and a rotatable platform. The FPGA programs were completed using the Verilog HDL. We programmed a LabVIEW VI to function as a controlling center. The data between PC and FPGA were transported through a ZigBee wireless network which consisted of 2 XBee devices and a wireless camera. They were used to monitor the moving condition of the arms. The experimental results show that the robot arms move with no apparent delay controlled by the host computer. The real-time display of the arm’s status is realized by the upper computer.
36
Yun, Wang, and Nobuhiko Azuma. "A new automatic ice-fabric analyzer which uses image-analysis techniques." Annals of Glaciology 29 (1999): 155–62. http://dx.doi.org/10.3189/172756499781821021.
Full textAbstract:
AbstractAn automatic ice-fabric analyzer has been developed, which can determine individual ,-axis orientations by image-analysis techniques. The analyzer consists of four major components: a sample stage, a pair of crossed polaroids, a charge coupled device (CCD) camera and a light source. Both the sample stage and the crossed polaroids can be rotated independently of each other by the stepping motors controlled by a personal computer (PC). Measurements are conducted as follows. An ice thin section is set on the sample stage and then the crossed polaroids are rotated. Thin-section images are recorded by the PC at intervals of 2° of rotation. From the image-intensity (gray value) dataset of each crystal in the thin section the extinction angles of individual crystals can be determined. Similarly, eight other extinction angles of individual crystals are obtained from eight other CCD camera positions with respect to the thin section: Finally, the .-axis orientation of individual crystals is calculated by using these extinction angles. With this technique, all crystals within the view of the CCD camera can be analyzed at the same time. In addition, with image-processing techniques the individual crystals are recognized automatically and other parameters, such as grain-size and grain shape, can be measured simultaneously. Textural studies of Dome Fuji (Antarctica) ice cores have been conducted with this analyzer.
37
Kawagishi, Kyosuke, Shoma Umetani, Ken Tanaka, Eiji Ametani, Yoshitaka Morimoto, and Keigo Takasugi. "Development of Four-Axis 3D Printer with Fused Deposition Modeling Technology." International Journal of Automation Technology 11, no. 2 (March 1, 2017): 278–86. http://dx.doi.org/10.20965/ijat.2017.p0278.
Full textAbstract:
A new four-axis 3D printer using fused-deposition modeling (FDM) technology has been developed. The hardware components, consisting of a mechanical structure and servo-control system, and an original computer-aided machining (CAM) system were developed. Three-dimensional printers, particularly those using FDM technology, have gained popularity even in hobby use for the easy modeling of special and original parts. Three-axis control systems using stepping motors or servomotors are generally used for the development of conventional 3D printers. The nozzle portion is therefore constrained in one direction. This leads to limitations in modeling 3D shapes. Adding degrees of freedom is necessary to create more complex features. We designed a new 3D printer with multi-axis control to address this problem. Our final goal is the development of a five-axis 3D printer. We started with a four-Axis 3D printer as a first step. The number of lamination directions is increased from three to four. As conventional CAM systems cannot be used to program the desired lamination for a four-axis 3D printer, a new CAM system using the Kodatuno kernel was developed. The system can determine the nozzle orientation based on the machine tool formulation. This paper reports the developmental background and an overview of the developed machine tool as well as its characteristics, its evaluation results, and our future plans.
38
Несиоловский, О. Г., Р. Д. Адакин, and И. М. Соцкая. "Implementation of Industrial Greenhouses Computer-Aided Management." Vestnik APK Verhnevolzh`ia, no. 4(52) (December 25, 2020): 73–79. http://dx.doi.org/10.35694/yarcx.2020.52.4.015.
Full textAbstract:
Представлен материал о работе автоматизированной системы управления климатом и поливом в промышленной теплице. Были написаны две программы, одна – для обеспечения работы контроллеров, вторая – для SCADA-программы, установленной на компьютере. Алгоритмы программ позволяют контроллерам опрашивать датчики и отсылать в SCADA-программу информацию, приходящую с контроллеров, и отсылать им в ответ управляющие сигналы. Обратные команды контроллеры принимают и выдают управляющие сигналы на реле, к которым подключено питание 220 В и 380 В, тем самым происходит управление электродвигателями насосов полива, управляемых клапанов полива, вентиляторов, обогревателей, а также светом. С контроллеров идёт управляющий сигнал и на шаговые двигатели, которые могут поворачиваться на строго заданный угол, тем самым открывая или закрывая окна теплицы на нужную величину. Таким образом регулируется поддержание температуры в теплице до значения уставки – температуры, заданной оператором. Для наглядности в SCADA были прорисованы схемы, кнопки, поля со значениями датчиков, облегчающие просмотр оператору работу автоматизированного оборудования в теплице. В SCADA-программе предусмотрен как автоматический режим управления климатом, так и ручной. Контроллеры и SCADA-программа общаются друг с другом не напрямую, а через посредника – OPCDA-сервер, который был настроен на приём и передачу данных с датчиков, а также управляющих команд. Особенность его настройки заключается в том, что имена переменных и их адрес в сети должен везде совпадать: в контроллерах, на сервере и в SCADA-программе. Программа имеет несколько степеней безопасности. The material on operation of automated system of climate control and irrigation in industrial greenhouse is presented. Two programs were written, one to ensure the operation of controllers, the second for a SCADA program installed on a computer. Program algorithms allow controllers to poll sensors and send information coming from controllers to the SCADA program and send control signals to them in response. The reverse commands of the controllers receive and output control signals to relays to which 220 V and 380 V power supplies are connected, thereby controlling the motors of the irrigation pumps, controlled irrigation valves, fan groups, heaters, as well as light. From the controllers there is a control signal to step motors, which can turn at a strictly angle indexing, thereby opening or closing the windows of the greenhouse to the suitable value. Thus, the maintenance of the temperature in the greenhouse is controlled to the setpoint value – the temperature set by the operator. For descriptive reasons in SCADA diagrams, buttons, fields with sensor values were drawn, making it easier for the operator to view the operation of automated equipment in the greenhouse. The SCADA program provides both automatic climate control and manual one. Controllers and SCADA-program communicate with each other not directly, but through an intermediary – OPCDA-server, which was configured to receive and transmit data from sensors as well as control commands. The peculiarity of its configuration is that the names of variables and their address in the network should coincide everywhere: in controllers, on the server and in the SCADA program. The program has several degrees of security.
39
Vasilyev, Vladislav, and Alexey Tsaplyn. "PULSE VOLTAGE CONVERTER APPLICATION FOR COMPENSATING THE CHARACTERISTICS OF SELF-GENERATED POWER SUPPLY OF AN ELECTRIC STOCK." Bulletin of scientific research results, no. 4 (December 17, 2017): 92–100. http://dx.doi.org/10.20295/2223-9987-2017-4-92-100.
Full textAbstract:
Objective: To improve energy efficiency of self-generated power supply usage on an electric stock, by means of pulse converter application. Methods: Calculation methods of electric lines, as well as simulation modeling with Matlab software programs and Simulink library package application were used. Results: A circuitry was offered, making it possible to extend the limits of self-generated power sources on an electric stock. A simulation computer program was developed in accordance with the suggested pulse converter circuit, providing an opportunity to study transient processes of tractive motors current and voltage regulation during acceleration and regenerative braking. Availability of the suggested circuit when dealing with an electric traction drive of a self-powered electric stock is corroborated by the results of simulation modeling. Practical importance: Switching converter application will make it possible to extend the range of use, by means of independent voltage source on the basis of capacity storage.
40
Fletcher, J. M., and Robert D. McClure. "Radial velocity spectrometers on the Dominion Astrophysical Observatory 1.2m and 0.4m telescopes." Symposium - International Astronomical Union 118 (1986): 447–48. http://dx.doi.org/10.1017/s0074180900151873.
Full textAbstract:
A photoelectric radial velocity spectrometer has been in operation for several years at the coudé focus of the 1.2m telescope of the Dominion Astrophysical Observatory (DAO). The design of this instrument has been described by Fletcher et. al. (1982) and by McClure et al. (1984). These papers discuss the similarities and differences between this spectrometer and others of its type such as that constructed by Griffin and Gunn (1974) at Palomar. The spectrum mask in the present instrument consists of more than 700 transparent slots on an opaque background, representing the spectrum of a K giant star, plus a few slots to coincide with the argon lines in a cadmium-argon discharge tube for use in obtaining comparison arc velocities. By progressively tilting the slots an appropriate amount along the mask and scanning by moving the mask relative to the stellar spectrum at 45° to the dispersion it is possible to retain a spectral match at non-zero velocities. The masks are produced using a standard measuring engine modified with stepping motors controlled by a computer to position and tilt the slots. Since guiding errors are our major source of error we hope to make a significant improvement in this area in the following manner. By inserting an image rotating prism behind the slit a 180° rotation of the slit will occur when the prism is rotated. Although this has not yet been tested, it is hoped that by making this rotation every few scans the effects of guiding errors due to uneven illumination of the slit and collimator will be vastly reduced.
41
Takanashi, Yuki, Hideki Aoyama, and Song Cheol Won. "Generation Method of Cutting Tool Paths for High-Speed and High-Quality Machining of Free-Form Surfaces." International Journal of Automation Technology 15, no. 4 (July 5, 2021): 521–28. http://dx.doi.org/10.20965/ijat.2021.p0521.
Full textAbstract:
In general, NC programs for machining free-form surfaces using a computer numerical control (CNC) machine tool are generated using a computer-aided manufacturing (CAM) system. The tool paths (CL data) generated by a CAM system are approximated straight-line segments based on tolerance (allowable error). As a result, the tolerance affects the machining accuracy and time. If the tolerance is set to a small value, the lengths of the segments are shortened, and the machining accuracy is improved. The process in which a CNC machine tool reads and analyzes an NC program and controls the motors requires a minimum processing time of an NC program block (block-processing time). Therefore, if the lengths of the approximated straight-line segments are too small, it will be impossible to reach the indicated feed speed, and the machining time will be longer. In this study, by identifying the block-processing time of a CNC controller and deriving the appropriate length of the approximated straight-line segment based on the block-processing time, a CL data creation method that is capable of high-speed and high-accuracy free-form surface machining is proposed. In addition, experimental verification tests of the method are conducted.
42
Mahmouditabar, Farshid, Abolfazl Vahedi, Pourya Ojaghlu, and Noureddine Takorabet. "Irreversible demagnetization analysis of RWAFPM motor using modified MEC algorithm." COMPEL - The international journal for computation and mathematics in electrical and electronic engineering 39, no. 5 (July 22, 2020): 1227–39. http://dx.doi.org/10.1108/compel-01-2020-0021.
Full textAbstract:
Purpose This paper aims to present a modified MEC algorithm for demagnetization modeling of the PM motor. One of the major issues that the designers of the permanent magnet (PM) motors are faced with is the demagnetization of magnets because of high temperatures and armature reaction. Demagnetization will weaken the magnetic properties of the magnet and lead to a reduction in the performance of the motor. Therefore, it is essential to provide appropriate methods for modeling this phenomenon. One of these methods that has a compromise between accuracy and time consumption is the magnetic equivalent circuit (MEC). In this paper, the MEC method is used for modeling the demagnetization phenomenon for the newly introduced ring winding axial flux PM (RWAFPM) motor. The proposed algorithm can take the demagnetization into account through a time-stepping model and also correct the value of the knee point flux density. Design/methodology/approach The modified MEC method is used for demagnetization modeling. The modified algorithm can take into account demagnetization and also renew the knee point at each step to increase the accuracy of the modeling. In addition, the proposed algorithm has a very high and fast execution speed so that the computation time of the MEC algorithm compared to the FEM model is reduced from 3 h to 35 s. In this case, the simulations have been performed on a core i5@ 2.3 GHz/8GB computer. The FEM model is used to verify the validity of the MEC results. Findings The obtained results show that at the high temperature, RWAFPM motor is severely vulnerable to demagnetization. At the temperature of 140°C, the demagnetization rate of 35% has occurred. So, it is necessary to use the high-temperature magnet in this motor or modify the motor structure in terms of demagnetization tolerant capability. Originality/value The RWAFPM motor is introduced for use in ship propulsion and traction systems. For this reason, an accurate estimation of demagnetization tolerant of this motor in different working conditions can show the strengths and weaknesses of this structure.
43
Pransky, Joanne. "The Pransky interview: Mel Torrie, Founder, CEO and President of Autonomous Solutions, Inc." Industrial Robot: An International Journal 45, no. 1 (January 15, 2018): 7–10. http://dx.doi.org/10.1108/ir-11-2017-0199.
Full textAbstract:
Purpose The following paper is a “Q&A interview” conducted by Joanne Pransky of Industrial Robot Journal as a method to impart the combined technological, business and personal experience of a prominent, robotic industry engineer-turned successful innovator and leader, regarding the challenges of bringing technological discoveries to fruition. This paper aims to discuss these issues. Design/methodology/approach The interviewee is Mel Torrie, CEO and President of Autonomous Solutions, Inc. (ASI). ASI manufactures an OEM/vendor independent software and hardware solution retrofitted to existing equipment to create a wide variety of fully autonomous vehicles spanning agriculture, mining, automotive, industrial cleaning, security and government/military applications. In this interview, Torrie shares how he first got started in the robotics field along with his experiences in running his ground-breaking startup. Findings In 1999, Torrie received a Master’s Degree in Electrical Engineering at Utah State University (USU) where he worked on two National Aeronautics and Space Administration (NASA) space shuttle payloads. After his work at USU, he managed robotics development programs for John Deere, the US Department of Defense and the US Department of Energy. He founded ASI, a spin-off of the Center of Self Organizing and Intelligent Systems (CSOIS) at USU, in 2000. Originality/value Torrie was a pioneer and visionary who bootstrapped ASI from the beginning. Under Torrie’s leadership, ASI raised over $85m in a unique business model where there is no equity but only strategic partners. These foremost companies are given exclusive rights to their vertical market and jointly own their industry’s driverless vehicle’s intellectual property (IP) with ASI. The vehicles are developed and tested at ASI’s 100-acre proving ground facility in Utah. To date, ASI’s more than 100 employees and their business partners have automated 75 different vehicle types and ASI continues to create new markets. Some of ASI’s notable installations include the Bingham Canyon Mine clean-up effort; BatCat, the teleoperated CAT telehandler for the Los Angeles Police Department; and the robotic durability testing program with Ford Motors, Toyota, Fiat Chrysler Automotive, Hyundai, General Motors as well as other private proving grounds.
44
Nair, Prashant Unnikrishnan. "Optimizing OCTG Thread Manufacturing Operation Using Automation." Journal of Advanced Manufacturing Systems 20, no. 01 (March 2021): 205–25. http://dx.doi.org/10.1142/s0219686721500116.
Full textAbstract:
The paper discusses a unique technique developed initially at Nation Institute of Technology, Surat that is remodeled in real-world applications. The concept consists primarily of a user-friendly software facilitating direct communication with any intelligent or learning system/robot operating under known parameters of motor specifications. Any software base permitting high level PC interface without ASCII interrupt can be used for easy programming. This allows for a learning operation mode where a prevention of time lag is enabled by stored machine data, captured through movements such movements can be physically made or taught via programs to the device and such learning aspects make the machine more efficient where the robot can either perform individual actions as needed or learn new methods for the same results and can perform a series of actions continuously. Using the stored data, the machine is also capable of autonomous movements based on the path of least resistance as calculated by the time it takes to perform an act. Interfacing Technique Tool Machining Robot (ITTMR) was developed as robotic tool holder that can determine the shape and size of different OCTG pipes utilized in the downhole industry and enable it to machine appropriate threads on the pipe with no manual intervention. The process thereby completely negates any possibility of human error which can otherwise cause heavy loss on finished equipment that are rendered unusable because of threading errors on almost nearly finished complex milled parts or assemblies that are pending threads as the final operation. The purpose of the software codes is to provide a user-friendly GUI that can communicate with any machine by pulling in appropriate ACNC programs and performing the required tasks associated with the operating system and specifications of the motors/mobilization equipment’s used. For the purpose of this paper, the software code is not provided. Any firmware base that permits the usage of an ASCII interrupt can be used and for the purpose of this operation, an RS323 equivalent board will also suffice for basic operations, however a complex ITTMR system has been utilized. This paper solely addresses the technique of how the threading operation is performed and does not address the process of how the pipe is bought to the machine or other associated aspects of the software to retain any possible patent applications on the same.
45
Borja Borja, Mario. "PLATAFORMA DE BRAZOS ROBÓTICOS DE TECNOLOGÍA ABIERTA PARA REALIZAR EXPERIENCIAS DE LABORATORIO DE CONTROL DE POSICIÓN, PLANIFICACIÓN DE TRAYECTORIA Y CONTROL DE VISIÓN ARTIFICIAL." Revista Cientifica TECNIA 26, no. 1 (November 28, 2016): 101. http://dx.doi.org/10.21754/tecnia-26012016.10.
Full textAbstract:
RESUMEN El principal problema en el desarrollo de carreras de especialización en robótica en nuestro país es que no existen laboratorios con brazos robóticos que permitan hacer pruebas de control de posicionamiento, planificación de trayectoria y control con visión artificial y generalmente en entornos académicos se hace experimentos utilizando software de simulación.En el presente trabajo se propone una alternativa para mejorar el aprendizaje en el estudio de control de brazos robóticos utilizando brazos robóticos reales con una plataforma de tecnología abierta de software y hardware que permita a los estudiantes modificar los programas para implementar algoritmos de control de posición de articulaciones, planificación de trayectoria y control con visión artificial.La propuesta es desarrollar la tecnología total del sistema de control del brazos robóticos en la base al análisis de los requerimientos de electrónica y sistema de computo realizar la selección de electrónica de potencia, computadoras industriales basadas en Controlador Digital de señales (DSC), una computadora personal para interface de usuario.Desarrollar el software base para la computadora industrial y el software base para la computadora personal que permita cargar programas en línea a través del puerto serial desde una computadora personal y además una interface de usuario en la computadora que puede ser modificada de acuerdo a la necesidad y utilizar como sistema de control de nivel superior que realiza los cálculos de planificación de trayectoria, problema inverso y otros sistemas de alto nivel de control con visión artificial.Como resultado se obtuvo la plataforma de tecnología abierta que incluye hardware y software para brazos robóticos de hasta seis grados de libertad con motores de corriente continua en las articulaciones de hasta 100 vatios, encoders y sensores de fin de carrera.La plataforma se probó con la mecánica del brazo robótico serial Mitsubishi RV-M1 que cumple con los parámetros electrónicos y constructivos requeridos por el prototipo.Palabras claves: brazos robóticos; control de posición; plataforma abiertaABSTRACT The main problem in the development of specialization courses in robotics in our country is that there are no laboratories with robotic arms that allow testing positioning control, path planning and control with artificial vision and generally in academic settings is done experiments using software simulation.In this paper an alternative to enhance learning in the study control robotic arms using real robotic arms with an open technology platform software and hardware that allows students to modify programs to implement control algorithms position it is proposed joints, path planning and control with artificial vision.The proposal is to develop the full technology control system of the robotic arms on the basis of the analysis of the requirements of electronic and computer system the selection of power electronics, industrial computers based on digital signal controller (DSC), a computer personnel to user interface.Develop the core software for industrial computer and basic software for the PC that allows load programs online through the serial port from a personal computer and also a user interface on the computer that can be modified according to the need and used as control system upper level that performs calculations path planning, inverse problem and other high-level systems with artificial vision control.As a result the open technology platform that includes hardware and software for robotic arms up to six degrees of freedom with DC motors in the joints of up to 100 watts, encoders and sensors to run was obtained. The platform was tested with the mechanics of serial robotic arm Mitsubishi RV-M1 compliant electronic and construction parameters required by the prototype.Keywords: robotic arms; position control; open platform
46
Borja Borja, Mario, Javier Rojas Tintaya, Rodney Rodas Regalado, Carlos Díaz Ramirez, and Cesar Paz Chavez Cesar Paz Chavez. "PLATAFORMA DE BRAZOS ROBÓTICOS DE TECNOLOGÍA ABIERTA PARA REALIZAR EXPERIENCIAS DE LABORATORIO DE CONTROL DE POSICIÓN, PLANIFICACIÓN DE TRAYECTORIA Y CONTROL DE VISIÓN ARTIFICIAL." Revista Cientifica TECNIA 26, no. 1 (November 28, 2016): 101. http://dx.doi.org/10.21754/tecnia.v26i1.11.
Full textAbstract:
RESUMEN El principal problema en el desarrollo de carreras de especialización en robótica en nuestro país es que no existen laboratorios con brazos robóticos que permitan hacer pruebas de control de posicionamiento, planificación de trayectoria y control con visión artificial y generalmente en entornos académicos se hace experimentos utilizando software de simulación.En el presente trabajo se propone una alternativa para mejorar el aprendizaje en el estudio de control de brazos robóticos utilizando brazos robóticos reales con una plataforma de tecnología abierta de software y hardware que permita a los estudiantes modificar los programas para implementar algoritmos de control de posición de articulaciones, planificación de trayectoria y control con visión artificial.La propuesta es desarrollar la tecnología total del sistema de control del brazos robóticos en la base al análisis de los requerimientos de electrónica y sistema de computo realizar la selección de electrónica de potencia, computadoras industriales basadas en Controlador Digital de señales (DSC), una computadora personal para interface de usuario.Desarrollar el software base para la computadora industrial y el software base para la computadora personal que permita cargar programas en línea a través del puerto serial desde una computadora personal y además una interface de usuario en la computadora que puede ser modificada de acuerdo a la necesidad y utilizar como sistema de control de nivel superior que realiza los cálculos de planificación de trayectoria, problema inverso y otros sistemas de alto nivel de control con visión artificial.Como resultado se obtuvo la plataforma de tecnología abierta que incluye hardware y software para brazos robóticos de hasta seis grados de libertad con motores de corriente continua en las articulaciones de hasta 100 vatios, encoders y sensores de fin de carrera.La plataforma se probó con la mecánica del brazo robótico serial Mitsubishi RV-M1 que cumple con los parámetros electrónicos y constructivos requeridos por el prototipo.Palabras claves: brazos robóticos; control de posición; plataforma abierta.ABSTRACT The main problem in the development of specialization courses in robotics in our country is that there are no laboratories with robotic arms that allow testing positioning control, path planning and control with artificial vision and generally in academic settings is done experiments using software simulation.In this paper an alternative to enhance learning in the study control robotic arms using real robotic arms with an open technology platform software and hardware that allows students to modify programs to implement control algorithms position it is proposed joints, path planning and control with artificial vision.The proposal is to develop the full technology control system of the robotic arms on the basis of the analysis of the requirements of electronic and computer system the selection of power electronics, industrial computers based on digital signal controller (DSC), a computer personnel to user interface.Develop the core software for industrial computer and basic software for the PC that allows load programs online through the serial port from a personal computer and also a user interface on the computer that can be modified according to the need and used as control system upper level that performs calculations path planning, inverse problem and other high-level systems with artificial vision control.As a result the open technology platform that includes hardware and software for robotic arms up to six degrees of freedom with DC motors in the joints of up to 100 watts, encoders and sensors to run was obtained. The platform was tested with the mechanics of serial robotic arm Mitsubishi RV-M1 compliant electronic and construction parameters required by the prototype.Keywords: robotic arms; position control; open platform.
47
WIERZCHOLSKI, Krzysztof. "THE PROBLEMS OF HYDRODYNAMIC NON-ISOTHERMAL LUBRICATION." Tribologia 268, no. 4 (August 31, 2016): 211–23. http://dx.doi.org/10.5604/01.3001.0010.6997.
Full textAbstract:
The classical hydrodynamic theory of slide bearing lubrication has been constituted on the assumption of constant pressure and viscosity perpendicular to the thin oil layer thickness. These fundamental assumptions are in contradiction to contemporary achievements connected with new devices such as micro-bearing, nano-bearing, magnetic bearings, artificial joints in humanoid robots, micro-motors. Therefore, new methods of measurements and calculations using AFM and a new mathematical computer programs are needed. Energy conservation equations after boundary layer simplifications confirm the fact that temperature gradient variations across the film thickness have the same order of magnitude as the variations in longitudinal or circumferential directions. The fact that temperature gradient variations across the bearing gap height can be significantly large are evident, despite the temperature differences across the film thickness that are negligibly small. This statement cannot be compliant with the assumption of a constant viscosity value in the gap height direction. It has been proven that hydrodynamic pressure is not constant across the film thickness for non-Newtonian oils with Rivlin Erickson constitutive equations. For pseudo-plastic non-Newtonian oils, the apparent dynamic viscosity significantly decreases with shear rate increases. However, for pseudo-plastic oils, the shear rate increments during the oil flow are strictly connected with the average flow velocity increments. Therefore, the apparent dynamic viscosity depends strongly on the oil velocity gradients. It is evident that flow velocity gradients across the film thickness have intensive variations, particularly in regions where gap height attains the least value. In these places, the dynamic viscosity attains the largest variations in gap height directions. If gap height in micro-bearing is smaller than one micrometre, than the largest oil dynamic viscosity increments caused by the velocity variations across the film thickness are located near the superficial layer of the movable journal surfaces in the case of the hydrodynamic lubrication by rotation, but in the neighbourhood where each of two come near lubricated surfaces during the squeezing. Hence, in these places, dynamic viscosity increases across the film thickness and attains the local maximum values. A gap height smaller than one micrometre has the largest oil dynamic viscosity increments caused by the adhesion force variations across the film thickness located near the motionless sleeve surfaces. In a similar manner, the influences on the viscosity variations caused by the cluster points of concentrations of nano particles as oil inhibitors or oil additives smaller than 5 nm occurring in micro-bearing gaps and the cluster concentration regions of collagen fibres occurring in human joint gap are observed. This paper describes and comments on the above-mentioned problem of oil viscosity changes in the gap height direction, and it presents the apparent dynamic viscosity functions for Newtonian and non-Newtonian oils as well indicates the largest viscosity variations in bearing gap height direction and gives examples of initial calculation results.