scholarly journals Some aspects of on-line computer control of a lathe

1979 ◽  
Author(s):  
Δημήτριος Πούλος
Keyword(s):  
Control Function ◽  
Low Cost ◽  
Computer Control ◽  
Spindle Motor ◽  
Electrical Circuit ◽  
Ball Screw ◽  
Real Time Control ◽  
Loop Control ◽  
Time Control ◽  
Circular Interpolation

A small lathe has been modified to work under microprocessor control to enhance the facilites which the lathe offers, and provide a wider operating range with relevant economic gains. As a result of these modifications the saddle motion is controlled by steppingmotors under closed-loop control giving better operating system characteristics as indicated below. An electrical circuit has been developed to monitor spindle torque and the mechanical link between the spindle motor and the screw has been replaced to give an " infinitely variable " gearbox, and this allows a variety of non-standard screws, helices and spirals to be manufactured. Software for the system includes control programs for implementation of the adaptive control function and monitoring of tool wear; linear and circular interpolation is implemented through the manipulation of Boolean functions, rather than by solving equations to optimise the performance of stepping motors when used for real-time control. Use o f low cost uncalibrated ball-screw s in conjunction with a calibration algorithm results in an overall accuracy better than the resolution of the system. It is concluded that it is practical to carry out a low-cost retrofit on existing machine tools to enhance their range of capabilities.

Using graphs to construct a math model of a microcontroller-based system for preset rate control of a flywheel motor to be used in high-dynamics spacecraft

2020 ◽  
pp. 126-134
Author(s):  
Vladimir V. NEKRASOV
Keyword(s):  
Real Time ◽  
Rotation Rate ◽  
Control Function ◽  
Real Time Control ◽  
Math Model ◽  
The Real ◽  
Time Control ◽  
Power Matrix ◽  
High Dynamics ◽  
Stated Problem

Developing a microcontroller-based system for controlling the flywheel motor of high-dynamics spacecraft using Russian-made parts and components made it possible to make statement of the problem of searching control function for a preset rotation rate of the flywheel rotor. This paper discusses one of the possible options for mathematical study of the stated problem, namely, application of structural analysis based on graph theory. Within the framework of the stated problem a graph was constructed for generating the new required rate, while in order to consider the stochastic case option the incidence and adjacency matrices were constructed. The stated problem was solved using a power matrix which transforms a set of contiguous matrices of the graph of admissible solution edge sequences, the real-time control function was found. Based on the results of this work, operational trials were run for the developed control function of the flywheel motor rotor rotation rate, a math model was constructed for the real-time control function, and conclusions were drawn about the feasibility of implementing the results of this study. Key words: Control function, graph, incidence matrix, adjacency matrix, power matrix, microcontroller control of the flywheel motor, highly dynamic spacecraft.

Servo Control System of Electrical Discharge Machining Based on PMAC

2014 ◽  
Vol 926-930 ◽  
pp. 1497-1500
Author(s):  
Xu Yang Chu ◽  
Gang Liu ◽  
Chun Mei Wang ◽  
Kai Zhu ◽  
Da Yun Chen ◽  
...  
Keyword(s):  
Control System ◽  
Electrical Discharge ◽  
Electrical Discharge Machining ◽  
Control Function ◽  
Servo Control ◽  
Human Computer Interface ◽  
Real Time Control ◽  
Time Control ◽  
Servo Control System ◽  
Hardware Resource

This paper describe the principles of Servo Control System of Electrical Discharge Machining Based on PMAC .To meet the requirements of processing and Put forward based on PMAC servo control system. This control system combines hardware resource with PMAC real-time control function. Elaborate human-computer interface developing process.

scholarly journals An On-Line Low-Cost Irradiance Monitoring Network with Sub-Second Sampling Adapted to Small-Scale PV Systems

Sensors ◽  
2018 ◽  
Vol 18 (10) ◽  
pp. 3405 ◽  
Author(s):  
Manuel Espinosa-Gavira ◽  
Agustín Agüera-Pérez ◽  
Juan González de la Rosa ◽  
José Palomares-Salas ◽  
José Sierra-Fernández
Keyword(s):  
Sensor Networks ◽  
Low Cost ◽  
Monitoring Network ◽  
Absolute Error ◽  
Small Scale ◽  
Photovoltaic Systems ◽  
Real Time Control ◽  
Short Term ◽  
Time Control ◽  
Cloud Motion

Very short-term solar forecasts are gaining interest for their application on real-time control of photovoltaic systems. These forecasts are intimately related to the cloud motion that produce variations of the irradiance field on scales of seconds and meters, thus particularly impacting in small photovoltaic systems. Very short-term forecast models must be supported by updated information of the local irradiance field, and solar sensor networks are positioning as the more direct way to obtain these data. The development of solar sensor networks adapted to small-scale systems as microgrids is subject to specific requirements: high updating frequency, high density of measurement points and low investment. This paper proposes a wireless sensor network able to provide snapshots of the irradiance field with an updating frequency of 2 Hz. The network comprised 16 motes regularly distributed over an area of 15 m × 15 m (4 motes × 4 motes, minimum intersensor distance of 5 m). The irradiance values were estimated from illuminance measurements acquired by lux-meters in the network motes. The estimated irradiances were validated with measurements of a secondary standard pyranometer obtaining a mean absolute error of 24.4 W/m 2 and a standard deviation of 36.1 W/m 2 . The network was able to capture the cloud motion and the main features of the irradiance field even with the reduced dimensions of the monitoring area. These results and the low-cost of the measurement devices indicate that this concept of solar sensor networks would be appropriate not only for photovoltaic plants in the range of MW, but also for smaller systems such as the ones installed in microgrids.

System Characterization and Plasma-Particle Distribution Analysis for Development of a Closed Loop Control for Plasma Spray

2000 ◽  
Author(s):  
M. Gevelber ◽  
D. Wroblewski ◽  
J. Fincke ◽  
W. D. Swank
Keyword(s):  
Plasma Spray ◽  
Spray Deposition ◽  
Distribution Analysis ◽  
Real Time Control ◽  
Critical System ◽  
Loop Control ◽  
Time Control ◽  
System Characterization ◽  
Advanced Control ◽  
And Performance

Abstract This paper investigates the need to develop an advanced control system for plasma spray deposition. The limitations and performance capability of both feed forward and real-time control are evaluated. Critical system characteristics for developing such controllers are experimentally identified including dominant nonlinearalities; dynamics, cross-coupling, distributions, and sensor issues.

UDP Network Communications for Wireless Control With Loop Coordination

2004 ◽  
Author(s):  
Paul A. Kawka ◽  
Nicholas J. Ploplys ◽  
Andrew G. Alleyne
Keyword(s):  
Closed Loop ◽  
Ad Hoc ◽  
Test Plant ◽  
Real Time Control ◽  
Loop Control ◽  
Communication Framework ◽  
Time Control ◽  
Wireless Control ◽  
Shared Goal ◽  
Communication Scheme

With the advent of Bluetooth and wireless 802.11 Ethernet protocols having transmission speeds up to 54 Mbps, wireless communication for closed-loop control is becoming more and more achievable. Some researchers have utilized Bluetooth networks for wireless control, resulting in successful stabilization of an unstable plant with a network controller. Previously, the authors of this paper developed a novel event-based control with time-based sensing and actuation communication method using 11 Mbps wireless Ethernet with the user datagram protocol (UDP). Near real-time control of an unstable Furuta pendulum with up to 250 Hz closed loop bandwidth was obtained using off the shelf hardware, Matlab, and Windows 2000 operating systems. The present work extends that communication scheme to two independent wireless loops that share a mutual goal, making additional communication between the two controllers advantageous. The communication framework for the coupled control in this ad hoc peer-to-peer network is presented along with some practical limitations. Data from a physical system implementing this framework demonstrates its effectiveness in application. The test plant couples a simple light tracking plant with a Furuta pendulum and a shared goal of maintaining line of sight (LOS) under normal conditions as well as reestablishing LOS in the case of lost contact due to sudden obstacles.

A Low Cost Fault-Tolerant Multiprocessor System for Real-Time Control

1986 ◽  
Vol 19 (13) ◽  
pp. 113-117
Author(s):  
J.J. Serrano ◽  
C. Cebrián ◽  
J. Vila ◽  
R. Ors
Keyword(s):  
Real Time ◽  
Fault Tolerant ◽  
Low Cost ◽  
Multiprocessor System ◽  
Real Time Control ◽  
Time Control

Translation + Pendaphonics = Movement Modulated Media

Leonardo ◽  
2012 ◽  
Vol 45 (4) ◽  
pp. 322-329 ◽  
Author(s):  
Byron Lahey ◽  
Winslow Burleson ◽  
Elizabeth Streb
Keyword(s):  
High Resolution ◽  
Real Time ◽  
Low Cost ◽  
Vertical Wall ◽  
State University ◽  
Arizona State University ◽  
Motion Sensing ◽  
Real Time Control ◽  
Projected Image ◽  
Time Control

Translation is a multimedia dance performed on a vertical wall filled with the projected image of a lunar surface. Pendaphonics is a low-cost, versatile, and robust motion-sensing hardware-software system integrated with the rigging of Translation to detect the dancers' motion and provide real-time control of the virtual moonscape. Replacing remotely triggered manual cues with high-resolution, real-time control by the performers expands the expressive range and ensures synchronization of feedback with the performers' movements. This project is the first application of an ongoing collaboration between the Motivational Environments Research Group at Arizona State University (ASU) and STREB Extreme Action Company.

Evaluation of a Low-Cost Microcontroller for Real-Time Control Education and Prototyping

2014 ◽  
Author(s):  
Ryan W. Krauss
Keyword(s):  
Feedback Control ◽  
Real Time ◽  
Closed Loop ◽  
Low Cost ◽  
Serial Communication ◽  
Real Time Control ◽  
Time Control ◽  
Active User ◽  
Bode Plots ◽  
Control Education

Arduino microcontrollers are popular, low-cost, easy-to-program, and have an active user community. This paper seeks to quantitatively assess whether or not Arduinos are a good fit for real-time feedback control experiments and controls education. Bode plots and serial echo tests are used to assess the use of Arduinos in two scenarios: a prototyping mode that involves bidirectional real-time serial communication with a PC and a hybrid mode that streams data in real-time over serial. The closed-loop performance with the Arduino is comparable to that of another more complicated and more expensive microcontroller for the plant considered. Some practical tips on using an Arduino for real-time feedback control are also given.

scholarly journals Application of the Novint Falcon haptic device as an actuator in real-time control

2013 ◽  
Vol 4 (3) ◽  
Author(s):  
Daniel J. Block ◽  
Mark B. Michelotti ◽  
Ramavarapu S. Sreenivas
Keyword(s):  
Embedded System ◽  
High Speed ◽  
Force Feedback ◽  
Low Cost ◽  
Small Scale ◽  
Input Device ◽  
Real Time Control ◽  
Modeling And Control ◽  
Time Control ◽  
Viable Solution

AbstractThis paper describes the development of an embedded system whose purpose is to control the Novint Falcon as a robot, and to develop a control experiment that demonstrates the use the Novint Falcon as a robotic actuator. The Novint Falcon, which is a PC input device, is “haptic” in the sense that it has a force feedback component. Its relatively low cost compared with other platforms makes it a good candidate for academic application in robot modeling and control. An embedded system is developed to interface with the multiple motors and sensors present in the Novint Falcon, which is subsequently used to control three independent Novint Falcons for a “ballon- plate” experiment. The results show that the device is a viable solution for high-speed actuation of small-scale mechanical systems.

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