Prof. Dr. Dimitar Dichev

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Academic Career Length

13Years (2014-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

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18 November 2021

Book Chapter

Mathematic Model of the General Approach to Tolerance Control in Quality Assessment

1 August 2014 in Measurement Science Review

Journal Article

A Model of the Dynamic Error as a Measurement Result of Instruments Defining the Parameters of Moving Objects

The present paper considers a new model for the formation of the dynamic error inertial component. It is very effective in the analysis and synthesis of measuring instruments positioned on moving objects and measuring their movement parameters. The block diagram developed within this paper is used as a basis for defining the mathematical model. The block diagram is based on the set-theoretic description of the measuring system, its input and output quantities and the process of dynamic error formation. The model reflects the specific nature of the formation of the dynamic error inertial component. In addition, the model submits to the logical interrelation and sequence of the physical processes that form it. The effectiveness, usefulness and advantages of the model proposed are rooted in the wide range of possibilities it provides in relation to the analysis and synthesis of those measuring instruments, the formulation of algorithms and optimization criteria, as well as the development of new intelligent measuring systems with improved accuracy characteristics in dynamic mode.

9 September 2022

Book Chapter

A General Approach for Tolerance Control in Quality Assessment for Technology Quality Analysis

1 December 2016 in Metrology and Measurement Systems

Journal Article

An Algorithm for Improving the Accuracy of Systems Measuring Parameters of Moving Objects

The paper considers an algorithm for increasing the accuracy of measuring systems operating on moving objects. The algorithm is based on the Kalman filter. It aims to provide a high measurement accuracy for the whole range of change of the measured quantity and the interference effects, as well as to eliminate the influence of a number of interference sources, each of which is of secondary importance but their total impact can cause a considerable distortion of the measuring signal. The algorithm is intended for gyro-free measuring systems. It is based on a model of the moving object dynamics. The mathematical model is developed in such a way that it enables to automatically adjust the algorithm parameters depending on the current state of measurement conditions. This makes possible to develop low-cost measuring systems with a high dynamic accuracy. The presented experimental results prove effectiveness of the proposed algorithm in terms of the dynamic accuracy of measuring systems of that type.

9 August 2024 in Sensors

Journal Article

A Method for Correction of Dynamic Errors When Measuring Flat Surfaces

This paper presents a new method for correction of dynamic errors occurring when measuring flat surfaces in the presence of mechanical effects. Mechanical effects cause inertial forces and moments that affect the moving components of measuring instruments, thereby causing dynamic errors. The study proposes a mathematical model, on the basis of which algorithms for correction of dynamic errors can be developed. The basic concept of the model is based on determining the optimal estimate in the current coordinate point on the basis of the theoretical model of the measured surface and the information from the measurement that contains errors caused by internal and external factors. Based on this model, an algorithm for real-time data processing has been developed. The algorithm works in “predictor-corrector” mode at each step of which the best estimate is obtained. The estimate is based on minimizing the variance of a random component in which the main values are formed from the accumulated statistical data of the error of the model and the measurement error. This paper presents the results of experimental studies, carried out with simulations of mechanical effects in four modes. The results confirm the high efficiency of the algorithm for high-accuracy measurement of flat surfaces in the presence of mechanical effects.

1 February 2015 in Measurement Science Review

Journal Article

A Kalman Filter-Based Algorithm for Measuring the Parameters of Moving Objects

About Me

Name：Dimitar Dichev Job title：Professor, Department of Mechanical and Precision Engineering, Technical university of Gabrovo, Bulgaria E-mail：dichevd@abv.bg Research background: Dimitar Dichev's scientific activity encompasses the following areas: metrology; accuracy of coordinate measuring machines (CMMs); methods and instruments for measuring dynamic quantities; and models and methods for dynamic accuracy analysis. Publication list: https://orcid.org/0000-0002-7103-9661 h-index: 13 h-index URL: https://www.scopus.com/authid/detail.uri?authorId=55193084000 Homepage: https://www.tugab.bg/en/about-us/faculty-of-mechanical-and-precision-engineering/mechanical-and-precision-engineering Author biography: Head of the Department of Mechanical and Precision Engineering at the Technical University of Gabrovo, Doctor of Sciences, and professor in the Department of Mechanical and Precision Engineering. Dimitar Dichev defended his PhD thesis in 2005. In 2015, he defended his thesis for the academic degree of Doctor of Sciences (DSc) in the specialty "Metrology and Metrological Assurance." Since 1990, he has been working as an assistant, and since 2007, he has been an associate professor in the Department of Mechanical and Precision Engineering. Since 2017, he has been a professor in the Department of Mechanical and Precision Engineering.

Prof. Dr. Dimitar Dichev

Prof. Dr. Dimitar Dichev

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About Me