Autor: Valášek, M. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Adhesive bond of carbon steel S235J0: effects of aluminium and polymer powder filled epoxy adhesives on mechanical properties
Autorzy:: Müller, M.
Valášek, P.
Powiązania:: https://bibliotekanauki.pl/articles/102623.pdf
Data publikacji:: 2016
Wydawca:: Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:: adhesive bond strength
SEM
microparticles filler
tensile strength
elongation
structural two-component epoxy
Opis:: The paper deals with the testing of composite materials based on aluminium and polymer microparticles. The aim of the research was to determine an influence of a content of a microparticle filler on mechanical properties of the polymer particle composite and adhesive bonds (material structural carbon steel S235J0). A preparation of adhesive bonds and a process of testing of the adhesive bonds were in accordance with the standard CSN EN 1465. The adhesive bond strength was increased when adding the aluminium and polymer powder filler. The adhesive bond strength increase was the highest at the adhesive bond with the adhesive in the form of the composite (15 g of the filler : 100 g of the matrix). The adhesive bond strength increase was 14.3% (13.68 ± 0.43 MPa). Adhesive bonds evinced an adhesive type of a fracture surface. By adding the filler in a form of microparticles there was a change of the failure type on adhesive-cohesive and a cohesive type. Fracture surfaces and an adhesive bond cut was examined with SEM (scanning electron microscopy) using a microscope MIRA 3 TESCAN.
Źródło:: Advances in Science and Technology. Research Journal; 2016, 10, 31; 87-93
2299-8624
Pojawia się w:: Advances in Science and Technology. Research Journal
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Experimental testing of active feed drive
Autorzy:: Sveda, J.
Valasek, M.
Sika, Z.
Powiązania:: https://bibliotekanauki.pl/articles/1429193.pdf
Data publikacji:: 2008
Wydawca:: Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:: machine tool
testing bed
linear motor
vibration suppression
control loop
Opis:: The main disturbances of the machine tool frame are caused by operation of motion axes. Movement of high dynamic motion axes is connected with powerful force stroke that excite machine tool frame vibration and deteriorate machining surface quality and productivity. There are several possibilities how to suppress this vibration. This deals with the simulation and experimental testing of new advanced conception where the main motor is connected with the frame by an active element that is controlled by intelligent control technique.
Źródło:: Journal of Machine Engineering; 2008, 8, 4; 43-58
1895-7595
2391-8071
Pojawia się w:: Journal of Machine Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Machine Tool Control with Additional Measurement for Increasing the Control System Dynamics
Autorzy:: Strakoš, P.
Valášek, M.
Powiązania:: https://bibliotekanauki.pl/articles/971176.pdf
Data publikacji:: 2009
Wydawca:: Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:: machine tool
additional measurement
predictive control
Kalman filter
Opis:: As a typical type of controller in the area of machine tools the classical cascade controller is used. It consists of several PI control loops and allows the position control of the machine tool. This type of controller is easy to be implemented and gives satisfactory results but only in the case that the sufficiently stiff machine tool is being controlled. If adverse is true the performance of the controller deteriorates. This is due to the fact, that the controller is limited by the structural properties of the machine tool. The bandwidth of the controller is restricted by the position of the first anti-resonant frequency of the machine tool. The control techniques overcoming this limitation have been extensively researched. As a result the control technique employing the additional measurement of TCP, the model-based predictive control and the Kalman filter is used and delivers the increased control system dynamics. The paper deals with the description of the proposed control concept and the practical methods for additional measurement together with the Kalman filter tuning are described. The evaluation of the proposed control concept is based on the experimentally measured data on the machine tool axis with significant flexibility.
Źródło:: Journal of Machine Engineering; 2009, 9, 3; 5-16
1895-7595
2391-8071
Pojawia się w:: Journal of Machine Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Measurement and Calibration of Machine Tools in 6 DOFs in Large Workspace
Autorzy:: Benes, P.
Valasek, M.
Sveda, J.
Powiązania:: https://bibliotekanauki.pl/articles/971210.pdf
Data publikacji:: 2009
Wydawca:: Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:: measurement
calibration
machine tool
6 DOFs
workspace
Opis:: The measurement and calibration of machine tools in the large workspace (for example 10x20x3m) and in all 6 DOFs (3 cartesian translations and 3 rotations) is not an easy task. A new device called RedCaM (Redundant Calibration and Measurement Machine) has been developed that enables simultaneously to measure all 6 DOFs in the workspace. The RedCaM machine was designed with redundant number of sensors and therefore as a parallel kinematical structure. Thus it profits from the fact that the sensor errors are not chaining. It is equipped only with the sensors and it is operated by the drives of the measured machine tool after the attachment of the platform into the machine tool spindle. The redundancy of sensors provides better accuracy, self-calibration property and very good ratio between the errors of particular sensors and the resulting error of the end effector position. This has been optimized and has proven the improved (minimized) transfer of the errors between the sensors and the position in space in 6 DOFs. In particular the used redundancy of sensors (9 sensors for 6 DOFs) enables the self-calibration (all kinematical parameters are calibrated during the first motions in the workspace) and the minimized transfer of errors between the sensors and the 6 DOFs of the platform that has been experimentally proven to be 1:1. The paper deals with the description of the modification of RedCaM for the usage in the large workspace of machine tools that are in principle unlimited.
Źródło:: Journal of Machine Engineering; 2009, 9, 3; 77-87
1895-7595
2391-8071
Pojawia się w:: Journal of Machine Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Optimized re-entry input shapers
Autorzy:: Beneš, P.
Valášek, M.
Powiązania:: https://bibliotekanauki.pl/articles/281198.pdf
Data publikacji:: 2016
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:: input shaper
command shaper
residual vibrations
re-entry
Opis:: The paper deals with the design of optimized input shapers for non-vibrational control of flexible mechatronic systems. The described method is based on a combination of advantages from two approaches – precomputed control curves and on-line shapers. The strategy has two steps. Primarily, an optimized precomputed curve is found as a solution to the point-to-point control problem with respect to any requested optimization goals. Then it is transformed into an on-line shaper with the re-entry property. The resulting shaper transforms any arbitrary input signal to a non-vibrational one. In contrast to other techniques, the shaper length is not determined from the system natural frequency. The shaper can be easily modified with respect to position, velocity, acceleration or jerk control. The theoretical results are verified by experiments using a laboratory crane.
Źródło:: Journal of Theoretical and Applied Mechanics; 2016, 54, 2; 353-368
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Simulation Testing of the Machine Tool Equipped With the Active Feed Drive
Autorzy:: Sveda, J.
Valasek, M.
Sika, Z.
Powiązania:: https://bibliotekanauki.pl/articles/971162.pdf
Data publikacji:: 2009
Wydawca:: Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:: machine tool
feed drive
control loop simulation
cutting force
vibration suppression
Opis:: The vibration of a machine tool is mainly caused by the dynamic acceleration of a motion axis and by the forces that act on it. All the disturbance forces are transmitted to the machine tool frame through the drive (motor) and its regulation loop and they excite its vibrations. Thus the achievable dynamics and machining quality is negatively influenced. There are several possibilities how to suppress the excited vibrations including the recently introduced "motor on motor" technique which is based on the serial connection of two linear motors. This paper presents new simulation results performed on the simulation model of a real machine tool. The maximal achievable tuning of the regulation loop parameters of the motion axis equipped with the "motor on motor" technique was confronted with the conventional feed drive setting. The "motor on motor" feed drive properties were also tested in the virtual machining operation mode where the real measured cutting force was used. The sensitivity analysis of the reaction force and the middle mass movement of the "motor on motor" feed drive solution to the predicted cutting force introduced to the feed drive control has been investigated. The middle mass is represented by the shared part of both linear motors which absorbs the high frequency part of the reaction force by its movement.
Źródło:: Journal of Machine Engineering; 2009, 9, 2; 81-92
1895-7595
2391-8071
Pojawia się w:: Journal of Machine Engineering
Dostawca treści:: Biblioteka Nauki

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