Wyniki wyszukiwania - BazTech

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Temperature control strategy for a seal fatigue tester

Czop P., Sławik D., Wszołek G., Związek M.

Journal of Achievements in Materials and Manufacturing Engineering

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2008

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Vol. 29, nr 2

155-158

EN

Purpose: The aim of the paper is optimization of a control strategy used in a seal fatigue tester. Design/methodology/approach: Analytical approach has been applied to get an understanding of a heat exchange process. It is required to optimize the control process algorithm. Findings: The initial control algorithm has been improved regarding numerous tests under different operating conditions. The final version of the control program allows to maintain the temperature according to the on-off strategy minimizing the temperature oscillations and potential overshoots. Research limitations/implications: It should be considered a new control strategy based on PID controller. Practical implications: The major component of the tester is the heat exchanger. It consists of a tube and embedded pipe circuit feeding with the external heating or cooling medium. The tube is a cylindrical housing where the seals are assembled at both sides. Two main pumps circulate the medium at a specified flow rate and pressure. The temperature is maintained to hold it almost constant during heating and cooling phases. Two thermocouples are placed close to the seals, and the one in the middle of the heat exchanger tube. The tester is equipped with a control system consisting of a PLC controller and LabView data acquisition application. It is possible to control the device remotely through LAN/WAN networks. The LabView application communicates with the controller via software with the use of PPI (Point-To-Point Interface) protocol. A new control algorithm has allowed to perform tests according to testing specification without significant overshoots. Originality/value: On-off control algorithm has been proposed for a combined heating-cooling installation rarely using in the industrial solutions.

2

Remote programming of the Mitsubishi Movemaster robot by using the web-based interface

Foit K.

Journal of Achievements in Materials and Manufacturing Engineering

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2008

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Vol. 31, nr 2

639-645

EN

Purpose: The aim of this paper is to present a prototype of web-based programming interface for the Mitsubishi Movemaster RV-M1 robot. Design/methodology/approach: The web techniques have been selected due to modularity of this solution and possibility of use the existing code fragments for elaborating new applications. The previous papers [11-14] have presented the off-line, remote programming system for the RV-M1 robot. The general idea of this system is a base for developing a web-based programming interface. Findings: The prototype of the system has been developed. Research limitations/implications: The presented system is in the early development stage and there is a lack of some functions. In the future a visualisation module will be elaborated and the trajectory translator intended to co-operate with CAD software will be included. Practical implications: The previous version of the system has been intended for educational purposes. It is planned that new version will be more flexible and it will have the possibility of being adapted for other devices, like small PLC's or other robots. Originality/value: Remote supervision of machines during a manufacturing process is an actual issue. Most of automation systems manufacturers produce supervising software for their PLC's and robots. The Movemaster RV-M1 robot is an old model and is lack of the high-tech software. On the other hand, the programming and development of applications for this robot are very easy. The aim of the presented project is to develop a flexible, remote-programming environment.

3

Design and development of seal components fatigue tester

Czop P., Sławik D., Wszołek G., Związek M.

Journal of Achievements in Materials and Manufacturing Engineering

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2008

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Vol. 30, nr 1

67-74

EN

Purpose: The aim of the paper is research and development concerning a fatigue tester of shock absorber seal systems. Design/methodology/approach: Analytical approach has been applied to get an understanding of a heat exchange process. The mathematical model has been formulated and validated based on the available measurements. Numerical simulation has been carried out to illustrate a heat exchange process performance. Findings: It is possible to control a seal temperature and mechanical friction related to the rod movement into the seal at the specified velocity. The model accuracy is sufficient to perform sensitivity analysis and optimize the design. Research limitations/implications: The components of a fatigue tester have to withstand the significant temperature differences in the range ~30;+140*C, e. g. hydraulic hoses, fittings, and pumps. Practical implications: We combine the analytical and experimental approach to provide customized and reliable engineering solution in the area of damper component seal development. A typical seal has a lip-like design protecting the moving parts against the leakage. It can be tested in a shock absorber or externally with use of a customized test rigs. Seal tests inside a shock absorber have numerous disadvantages. A shock absorber temperature rises during longer tests and cooling phase is required. This dramatically increases tests duration performed with the use of an expensive general-purpose hydraulic testing machinery. A compressed air or water jacket is used to accelerate the cooling process. Nevertheless, there are limitations related to the physics behind the cooling process. A seal component fatigue tester allows to perform the seal component tests out of the shock absorber. Originality/value: A new testing method provides possibility to quantify the main contributors of seal usage.

4

The system for simulation and off-line, remote programming of the Mitsubishi Movemaster RV-M1 robot

Świder J., Foit K., Wszołek G., Mastrowski D.

Journal of Achievements in Materials and Manufacturing Engineering

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2007

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Vol. 25, nr 1

7-14

EN

Purpose: of this paper: The paper presents a concept of a system for off-line programming, simulation and remote supervision of the Mitsubishi Movemaster RV-M1 robot. Design/methodology/approach: In the software development process a robot installed in institute's laboratory has been used. The software has been coded in a high level programming language in a manner that allows future improvements. Findings: As a result of the work, an initial version of software has been created. It has been developed for Windows platform. Research limitations/implications: The initial version of software has been dedicated to Movemaster RV- Ml and only this model is available for simulation purposes in virtual environment. Visualization processor recognizes only selected commands of MELFA BASIC. Future aims include creation of more flexible form of the software, which could be used on different operating system platforms and can handle other types of robots. Practical implications: Presently, the software is used internally for didactic purposes, during conduction of laboratory classes. Originality/value: Existing commercial systems are more or less hermetic. Developed software is intended to use standards for model representation and simulation (like OpenGL API).

5

The off-line programming and simulation software for the Mitsubishi Movemaster RV-M1 robot

Świder J., Foit K., Wszołek G., Mastrowski D.

Journal of Achievements in Materials and Manufacturing Engineering

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2007

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Vol. 20, nr 1-2

499-502

EN

Purpose: Contemporary robotics requires modern instruments for programming, control and supervising of robot's work. It becomes necessary to strict adjust the robot in its working environment after tests on a virtual model of the robot and its surroundings. The aim of present work is a presentation of preliminary version of the system for off-line programming, simulation and remote supervision of the Mitsubishi Movemaster RV-M1 robot. Design/methodology/approach: The robot installed in institute's laboratory has been used in research work. Attention has been focused on creating of universal software, which could be developed in the future. Findings: In result of carried work a first version of the software has been developed. It has network oriented modular structure. Research limitations/implications: The code of the software has been developed in high level programming in such manner, that allows further translation and transfer to the other system platform. Far-reaching plans include creation of universal form of the software, which could be applied to majority of system platforms and can operate with different types of robots. Practical implications: Created software has presently didactic character and it is used during conduction of laboratory classes. Originality/value: Conducted works have in view a creation of universal and modular software. Existing commercial solutions are usually dedicated to a concrete type of robot.