Design and development of a modular dynamic test system for resilient mechanical components and viscoelastic materials

Download
2016
Bilgi, Erkin Barış
Vibration is a critical phenomenon because unwanted vibration causes energy wasting, noise, premature failure etc. For this reason, control and isolation of vibration has importance. Viscoelastic materials such as plastics, rubbers etc., which show both viscous and elastic behaviors under the effect of stress, are used in many different vibration control and isolation applications. In addition to viscoelastic materials, resilient mechanical components such as springs, vibration mounts etc. are also important for vibration control and isolation applications. Dynamic properties such as fatigue life, dynamic stiffness, damping properties of these materials and components play important roles to design an effective damping instrument or vibration isolator. On the other hand, dynamic properties are dependent on the frequency and/or temperature. As a result, there is a need for a dynamic test system which characterizes the dynamic properties with respect to the frequency and/or temperature. There are commercially available package test systems, which include both hardware and software components in one product, to determine the dynamic properties of corresponding materials and components. However, these test systems are expensive. The aim of this thesis is to design and develop a custom modular dynamic test system to characterize dynamic properties of viscoelastic materials and resilient mechanical components in 0-100 Hz frequency range with 3 kN maximum force at low and high temperatures. For this purpose, an original mechanical design is prepared for a modular dynamic test system considering the requirements, specifications and constraints.

Suggestions

Design of an Experimental Setup for Periodic Forced Response Analysis of Shrouded Blades with Frictional Contacts
Öney, Eren; Ciğeroğlu, Ender (null; 2019-11-02)
High-cycle fatigue is one of the most frequent reasons of failure for turbomachinery and in early design process it is crucial to predict the vibration levels. Friction dampers or frictional contacts are commonly used in the design of gas turbine engines in order to decrease vibration levels and increase high-cycle fatigue lives of blades. However, due to the nonlinear behavior, dry friction complicates analysis of these systems. In this study, in order to understand the nonlinear frictional contact behavio...
Development of experimental test setups for bladed disks and non-linear vibration
Öney, Eren; Ciğeroğlu, Ender; Department of Mechanical Engineering (2019)
High-cycle fatigue is one of the most frequent reason of failure for turbomachines and in early design process, so it is crucial to predict the vibration levels. Various finite element modelling techniques for bladed-disk systems appear in the literature, including both reducing large size FEM and describing the frictional contact interface. However, not only having a large size FEM but also including the nonlinear friction to models makes the task very struggling and time consuming. In order to enhance the...
Design and prototyping of second generation METU MEMS electromagnetic micro-power generators
Turkyilmaz, Serol; Külah, Haluk; Muhtaroglu, Ali (2010-12-01)
This paper presents an electromagnetic (EM) vibration to electrical power generator which can effectively harvest energy from low frequency external vibrations. The reported second generation MEMS energy scavenger module up-converts low frequency environmental vibrations before mechanical-to-electrical conversion. Power is generated through planar electromagnetic induction using a magnet on the low frequency actuation plane, and coils on the high frequency resonance plane. The proposed approach has been dem...
Design and modeling elastomeric vibration isolators using finite element method
Ardıç, Halil; Özgen, Gökhan Osman; Özkan, Sami Samet; Department of Mechanical Engineering (2013)
In this thesis, a process is developed for designing elastomeric vibration isolators in order to provide vibration isolation for sensitive equipment being used in ROKETSAN A.Ş.’s products. For this purpose, first of all, similar isolators are examined in the market. After that, appropriate elastomeric materials are selected and their temperature and frequency dependent dynamic properties are experimentally obtained. Parametric finite element model of the isolator is then constituted in ANSYS APDL using the ...
Prediction of Vibro-Acoustic Response of Enclosed Spaces by Using Structural Modification Techniques
Demirkan, O.; BAŞDOĞAN, FATMA İPEK; Özgüven, Hasan Nevzat; Çalışkan, Mehmet (2010-09-22)
Low frequency noise caused by vibrating panels can become a problem for vehicles from NVH standpoint. The vibro-acoustic analysis of a simplified vehicle model is presented in this study. Analysis of vibro-acoustic behavior includes frequency response analysis of structure by Finite Element Method (FEM) and sound pressure level (SPL) prediction of the cabin interior by Boundary Element Method (BEM). The structural design of the vibrating panels can be modified by adding stiffeners to improve the acoustic fi...
Citation Formats
E. B. Bilgi, “Design and development of a modular dynamic test system for resilient mechanical components and viscoelastic materials,” M.S. - Master of Science, Middle East Technical University, 2016.