ERRORS CONVERSION ON TRANSFER FUNCTIONS OF MEASUREMENT AND CONTROL

2021 ◽  
Vol 4 ◽  
pp. 92-104
Author(s):  
Valentin Bahatskyi ◽  
◽  
Aleksey Bahatskyi ◽  
Keyword(s):  
Transfer Functions ◽  
Systematic Errors ◽  
Step Function ◽  
Control Device ◽  
Point Of View ◽  
Correct Operation ◽  
Analog To Digital ◽  
Analog To Digital Conversion ◽  
And Control ◽  
Measurement And Control

Currently, the measurement of electrical and non-electrical quantities is performed using analog-to-digital conversion channels, which consist of analog signal conditioning circuits and analog-to-digital converters (ADC) of electrical quantities into a digital code. The paper considers the case when the defining errors of the measurement and control channel are systematic errors of the ADC. The reliability of measurements is assessed by their errors, and the reliability of control - by the likelihood of correct operation of the control device. In our opinion, evaluating the reliability of such similar processes as measurement and control using different criteria seems illogical. The aim of the work is to study the effect of systematic errors of an analog-to-digital converter on the errors of parameter control depending on the type of conformity functions and the width of the control window, as well as the choice of the resolution of the ADC for various control tasks. The paper analyzes the transfer functions of measurement and control. It is shown that they are formed using step functions. It is proposed to use not a step function as a control transfer function, but other functions of conformity to the norm, for example, a linear function or functions of higher orders. In this case, the control result is assessed not according to the criterion of the probability of correct operation, but using the control error. Analyzed from the point of view of reconfiguring the errors of the line, parabolic and state parabolic functions of the norms for the development of changes windows in control. A recommendation has been given for the selection of functions for the conformity of standards and for the distribution of analog-to-digital conversions for industrial control enterprises.

Symposium on “Social Breakdown: A Plan for Measurement and Control”

The Family ◽  
1941 ◽  
Vol 21 (9) ◽  
pp. 283-298
Keyword(s):  
Community Organization ◽  
Point Of View ◽  
Social Breakdown ◽  
Work Community ◽  
The Family ◽  
Case Work ◽  
And Control ◽  
Measurement And Control ◽  
To Receive ◽  
Organization Research

In 1939, Community Chests and Councils, Inc., published a pamphlet in its series on community planning, “giving tested procedures for determining the extent of social breakdown in the community, and outlining a detailed plan for better co-ordinated service to social breakdown families.” Because of the significance of the procedure and plan to social case work and requests from our readers for some discussion of it, the Editorial Advisory Committee of The Family planned a symposium from the point of view of case work, community organization, research, sociology, and psychiatry. Bradley Buell, of Community Chests and Councils, was invited to discuss the background of the plan. We shall be glad to receive other brief discussions for the Readers' Forum.

Measurement and Control Device of Preloaded Ball Screw Drive

2011 ◽  
Vol 486 ◽  
pp. 73-76
Author(s):  
Xue Feng Ma ◽  
Chao Hao ◽  
Fu Qiang Li
Keyword(s):  
Force Measurement ◽  
Control Device ◽  
Ball Screw ◽  
Automatic Compensation ◽  
Detail Design ◽  
Specific Device ◽  
Ball Screw Drive ◽  
And Control ◽  
Measurement And Control

The deviation often appears in the feeding device of machine because of the screw spindle geometry torsional moment and the wear. The automatic compensation of the changes was proposed by means of a ball screw pretightening device by using adjustable force measurement and control. The detail design and simulation were conducted for the specific device. A case study was presented for the CNC lathe’s application. Testing results have shown that the device can be easily operated with an acceptable precision for positioning.

scholarly journals Technical considerations on the 3D printing components with DLP 3D printing process with ecological resin

2020 ◽  
Vol XXIII (1) ◽  
pp. 34-40
Author(s):  
Mircea Dorin Vasilescu
Keyword(s):  
3D Printing ◽  
Control Programme ◽  
Point Of View ◽  
Technological Parameters ◽  
Technical Parameters ◽  
Dimensional Measurement ◽  
Organic Resin ◽  
And Control ◽  
Measurement And Control ◽  
Technical Considerations

The purpose of this work is to analyse the technological aspects of the realization of components by 3D printing for the production of plan parts for experimental devices or stands. The author of this work envisages the realization of flat elements to which it can be determined how the organic resin material behaves when printing 3D with additive DLP technology. The work is structured in 5 chapters. In the first chapter, an analysis of how to make the plan elements by the additive DLP technology specific to the experimental programme adopted in this paper. The analysis will be carried out both constructively and functionally taking into account possibilities for designing components and making them. Chapter two is allocated to ordering technological parameters for 3D printing generation of parts defining the main technical parameters for generating them with ecological resin. The next chapter is allocated to analysing how to carry out the printer command program and check the structure of the element. In the four chapter, the dimensional measurement and control programme with dimensional and optical is presented. The last chapter is allocated to conclusions and comparisons from a technological point of view compared to other specific technologies for generating the analysed elements.

scholarly journals Improving mechanical properties of the UIC test bench

2021 ◽  
Vol 1199 (1) ◽  
pp. 012096
Author(s):  
L Čajkovič ◽  
F Pribilinec
Keyword(s):  
Main Idea ◽  
Point Of View ◽  
Vehicle Speed ◽  
Rail Vehicles ◽  
Higher Weights ◽  
Correct Function ◽  
Mechanical Components ◽  
And Control ◽  
Measurement And Control ◽  
Constant Improvement

Abstract Brakes are one of the most important components of vehicles. This is due to their function of decelerating, regulating vehicle speed and keeping vehicles stationary. The correct function and reliability of this system is essential for safe operation and vehicles driving. In our case, we deal with the brakes of rail vehicles. As trainsets achieve higher weights and speeds, great emphasis is also placed on improving the friction components of brake systems, which must meet the strict parameters set by the International Union of Railways (UIC) and must be tested on specialized approved test benches, before being put into service. As the demands on the development of friction components increase, so do the demands on their testing. From this point of view, there is necessary constant improvement in the measuring lane of the brake bench. It is necessary to improve the measuring and control technology as well as the mechanical components. This paper deals with the study of mechanical components in terms of operational dynamics. The main idea of the work is to create a virtual model of the brake bench in order to simulate the operating states and determine the critical modes with a possible adverse impact on the course of measurement and control. During the measurement, the monitored parameter is an important simulated mass, which must meet a precisely determined tolerance for the success of the measurement.

DC Protective Measurement and Control Device for Mass Transit Based on VxWorks

2014 ◽  
Vol 672-674 ◽  
pp. 1016-1021
Author(s):  
Qing Zhao Zeng ◽  
Jin Chuan Song ◽  
Su Zhuo Wu
Keyword(s):  
Hardware Implementation ◽  
Mass Transit ◽  
Control Device ◽  
Message Management ◽  
Technical Requirements ◽  
Implementation Scheme ◽  
Software And Hardware ◽  
Set Up ◽  
And Control ◽  
Measurement And Control

VxWorks operating system provides the technical foundation for the products development of DC protective measurement and control device for mass transit. According to technical requirements of products of DC protective measurement and control device for mass transit, this paper set up software and hardware implementation scheme and deeply analyzed the key technology such as task function division, message management, interrupt management and protection task realization.The successful application experience of this technology scheme has the guide meaning for the development of the similar products.

scholarly journals Remote monitoring system design of power substation based on GPRS

2021 ◽  
Vol 2108 (1) ◽  
pp. 012031
Author(s):  
Yicheng Xiong ◽  
Qian Liu ◽  
Maojun Deng ◽  
Zhilei Niu
Keyword(s):  
Real Time ◽  
Monitoring System ◽  
Remote Monitoring ◽  
High Reliability ◽  
Control Device ◽  
Remote Monitoring System ◽  
Power Substation ◽  
Save Energy ◽  
And Control ◽  
Measurement And Control

Abstract This paper studies the design scheme of a substation remote monitoring system based on GPRS, and gives the solution about poor real-time and imperfect function of centralized substation monitoring system. The working principle diagram of the measurement and control device is introduced in detail, and the modules of analog acquisition and switching input are designed. The substation remote monitoring software based on GPRS communication is developed to realize the remote real-time monitoring of electrical and switching parameters and other functions, such as data query, fault early warning and energy efficiency analysis. The experimental results show that the system has the characteristics of real-time, multi-function and high reliability. It is of great significance to implement defensive maintenance, improve power supply quality, save energy and reduce consumption.

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