Wyniki wyszukiwania - BazTech

1

Combination of feedback control and spring-damper to reduce the vibration of crane payload

Nguyen Trong Kien

Archive of Mechanical Engineering

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2021

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LXVIII, nr 2

165--181

EN

Operating cranes is challenging because payloads can experience large and dangerous oscillations. Anti-sway control of crane payload can be approached by the active methods, such as feedback control, or passive methods. The feedback control uses the feedback measurement of swing vibration to produce the command sent to a motor. The feedback control shows good effectiveness, but conflict with the actions of the human operator is a challenge of this method. The passive method uses the spring-damper to dissipate energy. The passive method does not cause conflict with the human operator but has limited performance. This paper presents the combination of two methods to overcome the disadvantages of each separate one. The passive method is used to improve the efficiency of the feedback method to avoid conflicts with the human operator. The effectiveness of the combination is simulated in a 2D crane model.

2

Selected measurement and control techniques : experimental verification on a lab-scaled overhead crane

Szpytko J., Hyla P., Kosoń-Schab A., Smoczek J.

Journal of KONES

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2017

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Vol. 24, No. 3

299--308

EN

This article presents three independent concepts of use high-level technique with it adaptation and implementation concerning overhead travelling crane device type. The main objective of this statement applies a solution for device workspace mapping, payload anti-sway control techniques strategy use and possibility of reliable steel construction health monitoring. In the first chapter, the vision system technology for obstacle in workspace visualization was presented. The main idea depends on use stereovision system with sets of camera mounted under the crane’s trolley which movement with the crane shifts. The stereo pictures, after digital processing, were used for develop so-called dense disparity map. The described architecture allows achieving information about device surroundings and obstacle position in the workspace. As the final result was presented three-dimensional map of the device workspace with obtained result accuracy discussion. The second type of described problem developed in chapter two concern the crane control methodology of designing the anti-sway system for payload stabilizing during the crane movement. The oscillation of a payload adversely affects the accuracy of performed transportation tasks and may present a safety hazard to employees, transferred payload and surrounding objects. The invented and described method mainly base on so-called soft computing methods. The next part of the article-focused attention of problem concerning health monitoring cranes construction as other equipment’s as well. The problem concerns usually the large industrial cranes carry out transportation operations in the presence of a large impact load and mechanical stresses acting overall crane’s structure. The safety and efficiency of crane operations can be improved through providing the continuous structural health monitoring as well in on-line and off-line mode. The main idea allows using Metal Magnetic Memory technique for supervising and estimating steel construction actual condition. All tests and considerations were conducted on the scaled physical model of overhead travelling crane with hosting capability 150 kg

3

Interval arithmetic-based fuzzy discrete-time crane control scheme design

Smoczek J.

Bulletin of the Polish Academy of Sciences. Technical Sciences

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2013

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Vol. 61, nr 4

863--870

EN

In many manufacturing segments, container terminals and shipping yards the automation of material handling systems is an important element of enhancing productivity, safety and efficiency. The fast, precise and safe transfer of goods in crane operations requires a control application solving the problems, including non-collision trajectory planning and limitation of payload oscillations. The paper presents the interval arithmetic-based method of designing a discrete-time closed-loop anti-sway crane control system based on the fuzzy interpolation of linear controller parameters. The interval analysis of a closed-loop control system characteristic polynomial coefficients deviation from their nominal values is proposed to define a minimum number of fuzzy sets on the scheduling variables universe of discourse and to determine the distribution of triangular-shaped membership functions parameters, which satisfy the acceptable range of performances deterioration in the presence of the system’s parameters variation. The effectiveness of this method was proved in experiments conducted using the PAC system on the laboratory scaled overhead crane.

4

Pole placement approach to crane control problem

Smoczek J., Szpytko J.

Journal of KONBiN

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2010

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No. 2-3 (14-15)

235-246

EN

The time and positioning accuracy of transportation operations realized by material handling systems are more and more significant problem in automated manufacturing processes, as well as the exploitation quality, safety and reliability, which can be met by implementing automation systems and improving control quality of material handling devices. The presented problem of anti-sway control system was solved using pole placement method employed to the time-discrete closed loop crane control system, which can be used in adaptive solutions. The proposed solution is based on the assumption, that crane nonlinear system is considered as a linear model with varying parameters.

PL

W zautomatyzowanych procesach produkcyjnych coraz istotniejszą rolę odgrywa zarówno czas i dokładność zadań realizowanych przez urządzenia transportowe, jak również ich niezawodność i jakość eksploatacji. Coraz wyższe wymagania stawiane systemom i urządzeniom transportu technologicznego, w tym również suwnicom, spełnione być mogą poprzez wdrażanie zautomatyzowanych rozwiązań i poprawę jakości sterowania. W artykule przedstawiono metodę projektowania systemu regulacji pozycji i prędkości suwnicy pomostowej oraz kąta wychylenia przemieszczanego przez urządzenie ładunku, opartą na metodzie lokowania biegunów oraz przyjętej do celów identyfikacji strukturze modelu dynamiki obiektu regulacji.