Modernization of the linear movement testRIG lineaarliikumisega katseseadmemoderniseerimine
Başlık çevirisi mevcut değil.
- Tez No: 644564
- Danışmanlar: Belirtilmemiş.
- Tez Türü: Yüksek Lisans
- Konular: Mekatronik Mühendisliği, Mechatronics Engineering
- Anahtar Kelimeler: Belirtilmemiş.
- Yıl: 2016
- Dil: İngilizce
- Üniversite: Tallinn University of Technology
- Enstitü: Yurtdışı Enstitü
- Ana Bilim Dalı: Belirtilmemiş.
- Bilim Dalı: Belirtilmemiş.
- Sayfa Sayısı: 86
Özet
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Özet (Çeviri)
The purpose of this thesis was to develop a tribometer by modernizing existing linear movement test rig. The objectives of the thesis were; the design of a test specimen loading system, the design of a friction forces measurement system, the design of a drive control algorithm and redesign of a drive control system, the design of a data acquisition system the design of a rig user computer interface, At first, the current commercially available examples have been reviewed and their working principles were investigated. Then, in order to build linear reciprocating device, existing linear movement test rig was studied and its components were checked whether it had sufficient component or not. It had AC motor which can be used in motion system, toothed belt driven actuator for providing linear reciprocating movement and VFD (Variable frequency drive) as controller of motion. As a result of evaluation of current components, it is determined to build a system based on installed components. Secondly, work was divided subsystems in order to set specifications and make it easier to study. These subsystems were defined as; Motion control Motion control system includes the machine elements such as toothed belt driven stage, an AC motor, and VFD as controller. These components were previously used components in existing test rig. Besides, in order to provide closed loop control and position feedback of test stage, external absolute encoder is used. In this system, connection of this components have been set up. Motion control system was designed to command system and run based on desired speed and motion of test configuration. For that purpose, it was determined to write a PC software, and an algorithm has been developed. On the other hand, a method for remote control of drive was utilized, and connections of encoder and VFD is established. Loading and friction measuring system There was need for a normal force application system. It is determined to use dead weight application principle. So, an arm was used to apply normal load by locating dead weight onto it. Friction force measuring mechanism has been designed from scratch. According to this 66 design, upper specimen holder connected to the arm which is located on rotating plate. This rotating plate has connected to a stationary stage through load cell. During experiment, when arm exposed to a friction force, it transfers this friction force to the load cell. Test material holders and fixing mechanisms are also considered in this system. Measuring structure In order to measure friction force, a load cell sensor was used. As a result of measurement, the load cell output signal is not directly related to the friction. For that purpose, the measuring structure is designed. NI 9237 Data acquisition board was used to collect voltage signal from load cell output as a result of applied friction force. This signal then transferred to the PC equipped with software. Connections of load cell, DAQ board, and PC were established. Measurement software and real-time monitoring After all, in order to track measurement process and observe the result of measurement, it is determined to have a platform for processing, visualizing and monitoring of the measured signal in real time on the screen. Thus, measurement, control, and monitoring software has been decided to write. An algorithm of this software was created. Software programming was left out from the thesis scope due to time limitations. The project was initially started with a plan that can be completed with couple of months but during the execution process, there were some critical issues faced. Firstly, in motion control, it was very difficult to find out how to connect VFD to computer and establish data communication between them. Moreover, the data communication part is not finally solved. To send and receive commands in practice, it needs practical experimenting with the device in order to get more experience in data communication and fieldbus fields. Algorithm was developed in order to explain it conceptually. This algorithm shall be a basis for practical programming. Considering the whole process, work has been completed in conceptual level. Components for motion control have been chosen and their connections and motion control method have been established. Mechanical system for loading and friction measurement has been designed. The detail and assembly drawings need to be developed based on given 3D models. Measurement structure components and their connections are presented. Load cell calibration method has been studied and determined. For the future work, these subsystems can be studied in detailed level.
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