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Design and analysis of a new magneto rheological damper for washing machine
Abasin Ulasyar,Ismail Lazoglu 대한기계학회 2018 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.32 No.4
In this article, a new magneto rheological (MR) sponge damper is proposed for suppression of vibrations in a washing machine. The article presents design optimization of geometric parameters of MR sponge damper (MRSD) using the finite element analysis (FEA) and first order derivative techniques for a washing machine. The article explains the hysteresis behavior and the relationship of damping force with input current for the proposed MRSD. Moreover, the characteristics of the MRSD such as energy dissipation and equivalent damping coefficient are investigated experimentally in terms of input current and excitation amplitude. The passive dampers installed in washing machine are ineffective in reducing unwanted vibrations at resonant frequencies due to real time unbalanced mass. For this purpose, a test setup is established in order to compare the performance of passive dampers with the proposed MRSDs in a washing machine. It is noticed that MRSDs reduce average vibrations of 75.61 % in a low frequency band, whereas in a high frequency band, the MRSDs lessen average vibrations of 30.57 % in a washing machine. In order to determine the performance of proposed design MRSD, a detailed comparison of the performance parameters, such as total damping force, passive force, maximum average vibrations after suppression by MR dampers, maximum current and power ratings is provided with the existing designs of MR damper for washing machine from the literature.
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A novel sensor using photo-interrupter for measuring static friction coefficient
Abbas Hussain,Omer Subasi,Ismail Lazoglu 대한기계학회 2020 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.34 No.6
A force sensor design utilizing a photo-interrupter is presented for measuring the static coefficient of friction (COF). The measurement of ice friction on polymer surfaces, a process that requires detecting forces in the sub-Newton range, is chosen for the study. The photo-interrupter is coupled with a specially designed sensitive flexure, with structural parameters validated through finite element methods, to detect the small forces. The static properties of the sensor are characterized by calibration techniques. An accompanying rotary table is constructed to measure the COF of ice on polymethylmethacrylate (PMMA) and polyester specimens under refrigeration conditions. The experimental results indicate that the device can be utilized to predict the COF. The designed portable and miniature friction measurement setup can be a compact and cost-efficient alternative to bulky tribo-rheometer equipment.
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Electromechanical modeling of a novel moving magnet linear oscillating actuator
Adnan Hassan,Armin Bijanzad,Ismail Lazoglu 대한기계학회 2018 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.32 No.9
This article presents a design of a novel moving magnet linear actuator (MMLA) for linear refrigerator compressor. A methodology to estimate the magnetic flux density as well as the magnetic force of MMLA is presented. Considering the simulation time of a 3D FEM software, a combination of 2D FEM with the analytical models makes this technique convenient and expeditious. Using the 2D FEM, the magnetic flux path is segregated into several loops which are divided into finite reluctance zones. The reluctance models for each zone incorporates the effect of armature position to predict the magnetic flux density and linear force incorporating the stator saturation. A 3D FEM simulation is executed to compare the presented models as well as computation times. Furthermore, an analytical approach for evaluating the effect of the excitation frequency and motor constant on the dynamic performance of a linear oscillating actuator is presented and validated experimentally.
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