Автор: Ali Kasal

Статии

TESTING THE LEARNING OUTCOMES OF WOOD TECHNOLOGY COURSE

Автори: Mehmet Acar, Yusuf Ziya Erdil, Ali Kasal, Selcuk Demirci

Резюме

In this study, realization level of learning outcomes is examined within the context of a pilot course. Purpose of this study is to test learning outcomes of the pilot course which are determined by instructor. For this purpose, “Wood Technology” course, which has been taught at Department of Wood Science and Furniture Design and Department of Woodworking Industrial Engineering, is chosen as a pilot course. The course consists of 12 units. Learning outcomes of each unit are prepared by the instructor. To test realization level of learning outcomes, two different questionnaire were prepared and applied to students who had taken the course in the period when study was conducted. One of the questionnaire was to determine „students’ expectation“ from each course unit before teaching. The other questionnaire was to determine „achieved level“ at the end of each course unit. To check the validity of achieved level, a quiz was given at the end of each course unit. In addition, another questionnaire was applied to determine level of „achieved learning outcomes“ of graduated students. All data were analyzed statistically and results were compared by t tests. As a result of statistical analyses, it was determined that students underestimated their learning outcomes by 105 %; i.e.; they learned two times more than their expectation. In general, it can be concluded that determination and testing learning outcomes in a course is necessary in order to achieve a better learning-teaching balance.

Ключови думи: Learning outcomes, National Qualification Framework For Higher Education, Wood Technology Course

EN Version

A METHODOLOGICAL APPROACH FOR NUMERICAL ANALYSIS OF UPHOLSTERED SOFA WITH FINITE ELEMENT METHOD (FEM)

Автори: Tolga Kuşkun, Ali Kasal, Ersan Güray, Recep Birgül, Yusuf Ziya Erdil

Резюме

Engineering design of furniture is an important issue for modern industry and it can be accomplished by means of creating a model structure and analyzing by a convenient software. A fair strength analysis of furniture structure is a computationally complex process since various types of member types, e.g. springs, upholster plates and complicated mechanisms type connections, are included in modelling. Finite element method (FEM) is the most convenient approach to analyze furniture systems because of the member variety and the furniture’s, in general, complex geometry. In this study, an improvable methodological approach was recommended for numerical analyses. Upholstered sofas are tested under backrest frame loads according to the principles of FNAE 80-214 General Services Administration Upholstered Furniture Test Method (GSA), then numerical analysis is carried out to simulate the performance tests on virtual platform. 3D modelling of sofa is made with SpaceClaim 3D solid models software and analyses are performed with a Finite Element Software, Ansys Workbench. Entire system of the sofa, including all members, joints, connections and springs are defined with convenient parameters related to mechanical properties of the material and the resulting deformations of the experiments. In this study, the sofa model is developed in a methodological manner, in three different ways. The model is improved with small details and it is observed that small changes in the model resulted in essential outcomes such that consistent results are decided to be achieved by means of tuning some parameters, e.g. spring constants, upholster thickness and elasticity. According to the results, reasonable estimates are obtained from the numerical analyses by using this methodological approach.

Ключови думи: numerical analysis, upholstered furniture, furniture performance test

EN Version

EVALUATION OF VARIOUS LIGHTWEIGHT ARMCHAIRS IN TERMS OF ERGONOMICS

Автори: Mehmet Yuksel, Yusuf Ziya Erdil, Ali Kasal, Mehmet Acar

Резюме

This study aimed to evaluate comfort level of the lightweight armchairs based on user’s feedback. For this purpose, 5 different lightweight armchairs were selected and a total of 30 healthy adult volunteers (15 males and 15 female) joined to the study. A survey composed of 10 questions based on three times interval that consist of 5, 15, and 30 minutes was applied to the volunteers. The survey concentrated to obtain subject’s feedbacks related to their body reactions while they are sitting on the armchairs by five point Likert Scale. Results were analysed statistically and according to the results, some of design criteria such as backrest form, armrest height, sitting depth, and sitting height significantly affected the comfort feeling while sitting on sample armchairs. As a conclusion, it can be said that comfort in use can be increased by consideration of ergonomic criteria in design process.

Ключови думи: Armchair, furniture ergonomics, furniture design, comfort

EN Version