Akademik Veri Yönetim Sistemi
Tezin Türü: Yüksek Lisans
Tezin Yürütüldüğü Kurum: Marmara Üniversitesi, Fen Bilimleri Enstitüsü, Makine Mühendisliği (İngilizce) Anabilim Dalı, Türkiye
Tezin Onay Tarihi: 2019
Tezin Dili: İngilizce
Öğrenci: MEHMET FAZLI TEKNECİ
Danışman: Paşa Yayla
Özet:
All of the home appliances and electronic devices
are exposed some incidents such as dropping, striking and crushing etc. during
transportation. Unsuitable carrying conditions, carelessness during picking up
from floor and putting down may cause breaking of some plastic parts, wrapping
or bending of some sheet metal based parts. This situation cause not only
customer dissatisfaction but also loss of money for the company. In order to
prevent these problems, Expandable Polystyrene (EPS) material based parts are
used on the packaging of a wall-mounted air conditioner indoor unit. The EPS
material based parts are the most commonly used ones because of their impact
absorber properties. There are some studies about drop test for home appliances
such as oven, washing machine, dishwasher, and refrigerator and for electronic
devices such as optical pickup,
television, test board and mobile phone. In this study dynamic behaviour
of a wall-mounted air conditioner indoor unit was analysed under drop impact
condition. To perform Finite Element (FE) analysis, ANSYS commercial software
was used and the drop tests were performed according to ASTM D5276 (1998) and
ASTM D880 (2002) standards. Strain gauges were used to measure the effective
stresses at the bottom edge of decor hook and at the back side of discharge
grille hook which were subjected to excessive deformation. A high speed camera
was employed to record drop test, special attention is paid to detect contact
duration between the product and rigid ground. This duration was used as an
import value at Finite Element analysis. During drop test, the stress values were measured as 255,2 MPa for decor hook and 97,1
MPa for discharge grille hook. The FE and physical test strain gauge results
were compared to validate the FE analysis. Improvements on the wall-mounted air
conditioner indoor unit were made at damaged locations and those improvements
were validated by drop test, transportation test and clamping test. Conducting
the strain gauges instrumented drop test and utilizing the FE results decreased
lead time of product development, reduced the product development costs and
eliminated the potential risks in the product in advance. This approach
presented with this work can be a reference guide for developing more effective
packing types and preventing failure and accidents for cassette, floor standing
etc. air conditioners in future studies.