Real-Time Control of Welding Penetration via Arc Sound Signal for GTAW Welding

2020 ◽  
pp. 81-95
Author(s):  
Na Lv ◽  
Shanben Chen
Keyword(s):  
Real Time ◽  
Sound Signal ◽  
Real Time Control ◽  
Time Control ◽  
Arc Sound ◽  
Arc Sound Signal

Design and Implementation of Real-Time Audio Transmission System

2012 ◽  
Vol 433-440 ◽  
pp. 2887-2891
Author(s):  
Yun Jun Chen ◽  
Xiu Ming Jiang ◽  
Gong Yuan Yang ◽  
Yan Cai
Keyword(s):  
Real Time ◽  
Design Process ◽  
Design Pattern ◽  
Sound Signal ◽  
Signal Acquisition ◽  
Digital Audio ◽  
Audio Signals ◽  
Real Time Control ◽  
Design And Implementation ◽  
Time Control

Continuous Multi-channel digital audio signals system not only guarantees the continuity of signal acquisition, but has the real-time control ability in the process of signal acquisition. This paper proposes the producer/consumer design pattern which can make program designing quicker, simpler and more efficient. Through the example of continuous sound signal acquisition, the designing idea for the Producer/consumer design pattern is described in details and the design process of this program on the Delphi platform is given. The result shows that the introduction of the producer/consumer design pattern in the use of program design which has serious request in real-time and continuous sound signal acquisition and playing can make the processes response faster and more efficient．

Automatic measuring and processing system of audio sensing for real-time arc height control of pulsed GTAW

Sensor Review ◽  
2014 ◽  
Vol 34 (1) ◽  
pp. 51-66 ◽  
Author(s):  
Na Lv ◽  
Jiyong Zhong ◽  
Jifeng Wang ◽  
Shanben Chen
Keyword(s):  
Real Time ◽  
Linear Model ◽  
Environmental Noise ◽  
Sound Signal ◽  
Pulse Interference ◽  
Content Type ◽  
Height Control ◽  
Pulsed Gtaw ◽  
Arc Sound ◽  
Arc Sound Signal

Purpose – Surface forming control of welding bead is the fundamental study in automated welding. Considering that the vision sensing system cannot extract the height information of weld pool in pulsed GTAW process, so this paper designed a set of automatic measurement and control technology to achieve real-time arc height control via audio sensing system. The paper aims to discuss these issues. Design/methodology/approach – The experiment system is based on GTAW welding with acoustic sensor and signal conditioner. A combination denoising method was used to reduce the environmental noise and pulse interference noise. After extracting features of acoustic signal, the relationship between arc height and arc sound pressure was established by linear fitting. Then in order to improve the prediction accuracy of that model, the piecewise linear fitting method was proposed. Finally, arc height linear model of arc sound signal and arc height is divided into two parts and built in two different arc height conditions, which are arc height 3-4 and 4-5-6 mm. Findings – The combination denoising method was proved to have great effect on reducing the environmental noise and pulse interference noise. The experimental results showed that the prediction accuracy of linear model was not stable in different arc height changing state, like 3-4 and 4-5-6 mm. The maximum error was 0.635588 mm. And the average error of linear model was about 0.580487 mm, and the arc sound signal was accurately enough to meet the requirement for real-time control of arc height in pulse GTAW. Originality/value – This paper tries to make a foundation work to achieve controlling of depth of welding pool through arc sound signal, then the welding quality control. So a new idea of arc height control based on automatic measuring and processing system through arc sound signal was proposed. A new way to remove environmental noise and pulse interference noise was proposed. The results of this thesis had proved that arc sound signal was an effective features and precisely enough for online arc height monitoring during pulsed GTAW.

A Real Time Control Architecture for Continuously Managing Patients in a Care Unit

1995 ◽  
Vol 34 (05) ◽  
pp. 475-488
Author(s):  
B. Seroussi ◽  
J. F. Boisvieux ◽  
V. Morice
Keyword(s):  
Real Time ◽  
Linear Time ◽  
Treatment Plan ◽  
Control Architecture ◽  
Real Time Control ◽  
Time Representation ◽  
Time Control ◽  
Continuous Support ◽  
Definition Of ◽  
Computerized System

Abstract:The monitoring and treatment of patients in a care unit is a complex task in which even the most experienced clinicians can make errors. A hemato-oncology department in which patients undergo chemotherapy asked for a computerized system able to provide intelligent and continuous support in this task. One issue in building such a system is the definition of a control architecture able to manage, in real time, a treatment plan containing prescriptions and protocols in which temporal constraints are expressed in various ways, that is, which supervises the treatment, including controlling the timely execution of prescriptions and suggesting modifications to the plan according to the patient’s evolving condition. The system to solve these issues, called SEPIA, has to manage the dynamic, processes involved in patient care. Its role is to generate, in real time, commands for the patient’s care (execution of tests, administration of drugs) from a plan, and to monitor the patient’s state so that it may propose actions updating the plan. The necessity of an explicit time representation is shown. We propose using a linear time structure towards the past, with precise and absolute dates, open towards the future, and with imprecise and relative dates. Temporal relative scales are introduced to facilitate knowledge representation and access.

Real-time Control for Mobile Robot Considering Environmental Changes

2007 ◽  
Vol 73 (12) ◽  
pp. 1369-1374
Author(s):  
Hiromi SATO ◽  
Yuichiro MORIKUNI ◽  
Kiyotaka KATO
Keyword(s):  
Mobile Robot ◽  
Real Time ◽  
Environmental Changes ◽  
Real Time Control ◽  
Time Control

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.

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