Conveners
Laser Technology: LT I
- Lyubomir Lazov (Rezekne Academy of Riga Technical University)
- Imants Adijāns (RTU Rezekne Academy)
Laser Technology: LT II
- Lyubomir Lazov (Rezekne Academy of Riga Technical University)
- Imants Adijāns (RTU Rezekne Academy)
Description
Remote Microsoft Teams link for session:
https://teams.microsoft.com/meet/370720276875519?p=0YScKEvJuAZhBdZq19
Abstract: Laser hardening of steels is a modern technological process widely used in the automotive, aerospace, and tooling industries. In the present study, a comparative analysis between numerical modeling results and experimental data for the laser hardening process of 42CrMo4 steel samples is performed. Numerical calculations were used to determine preliminary operating intervals of power...
This paper presents an optimization-based approach for the first-order design of infrared triplet systems in the LWIR spectral range. The method is based on paraxial optical theory and formulates the design task as a multi-parameter optimization problem aimed at minimizing chromatic aberrations and Petzval curvature under given constraints. Numerical optimization techniques are applied to...
This paper deals with the synthesis of state controller for an electrohydraulic power transmission system. There are shown the mathematical model of the electrohydraulic system and state controller synthesis method with state space feedbacks. The controller coefficients are obtained from preliminary defined error performance index. The response curves are obtained from computer simulation. The...
This paper presents an experimental investigation into the frequency response of an electropneumatic positioning system, which includes a rodless pneumatic cylinder and four 2/2-way high speed pneumatic valves operated via pulse width modulation. The experimental procedures are captured and analyzed in real-time using a dedicated virtual instrument. The amplitude and phase Bode plots for the...
The electropneumatic drive system with PWM control is used in machines and equipment where it is necessary for the actuator to be positioned at a significant distance from the control valves. This leads to changes in the dynamic characteristics of the systems, depending on the length of the connecting pneumatic lines. The report presents a mathematical model of an electropneumatic positioning...
This paper presents an adaptive Kalman filter for video-based object tracking, in which the covariance matrices of the process and measurement noise are dynamically updated in real time. The proposed approach is based on a linear stochastic model without introducing a control input, which is justified by the nature of video observation, where only measurement information from consecutive...
Abstract—Durable color laser markings on stainless steel are attractive for traceability, product authentication, and identification of industrial components exposed to mechanical contact. In this work, the scratch-test response of nanosecond fiber-laser-marked AISI 304 stainless steel was evaluated for a 7 × 7 processing matrix. The laser-marking parameters were: average power P = 3–15 W and...
This paper deals with the synthesis of state controller with observer for an electrohydraulic power transmission system. There is shown a method for synthesis of the state controller with observer and the realization for electrohydraulic system. The controller coefficients are obtained from preliminary defined performance definitions. The system has been modeled, and step responses curves are...
Experiments were carried out on the process of color marking with a fiber laser on AISI 304 steel samples. The influence of the number of passes - one (at 0°), two (at 0° and 90°) and three (at 0°, 60° and 120°), the raster step and the scanning speed on the roughness and the resulting colors was studied. R/G/B coordinates of all marked squares were obtained. The positions of the individual...
This paper presents a Bayesian method for recursive fusion of prior and measurement information aimed at improving accuracy in video-based measurements. The approach is based on a probabilistic formulation of the estimation problem, where measurements are modeled as random variables with additive noise, and the system state is described by a prior distribution.
By applying a recursive...
Temperature is one of the most commonly measured quantities in science and industry. Temperature can have a significant impact on the course of various processes therefore, its accurate measurement and control is a task of particular importance for every process in everyday life, science, and industry. Precise temperature measurement is used in all fields - electronics, communications,...