منابع مشابه
Vibration Test Evolution
Vibration testing is widely accepted as a method to improve product quality by identifying structural weaknesses. Historically, single axis, single shaker testing is the method of choice. This is largely due to the lack of economical and effective test hardware and control software. Significant advances have been made in both arenas, resulting in test equipment design that permits multiple shak...
متن کاملthe relationship between test-takers and experts perception of prompt difficulty
چکیده مهارت شنیداری برای مدتهای طولانی در آموزش ، تحقیق و ارزیابی مورد غفلت قرار گرفته است. اگرچه در سالهای اخیر به خاطر اهمیت قابل ملاحظه این توانائیها در آموزش و آزمون زبان ، توجه بیشتری به توانائیهای شنیداری شده است. هم چنانکه درک شنیداری در آموزش و ارزیابی زبان دوم اهمیت فزاینده ای می یابد محققین سعی نموده اند تا ماهیت مهارتهای مستتر در مهارت شنیداری را مورد بررسی و مطالعه قرار دهند. هدف ...
15 صفحه اولDistant ~otions from a Building Vibration Test By
Horizontal ground motion generated by vibration tests of the nine-story Millikan Library Building on the Caltech campus was recorded on 1he surface of the ground in the Pasadena area at distances up to 3 miles from the building. Later it was learned that the vertical component of the motion also was recorded by the seismograph on Mt. Wilson, 6.7 miles from the Library and 4,800 ft higher in ele...
متن کاملDeveloping a Feature Extraction of Existing Structures Using an Ambient Vibration Test
The paper aims to extract the dynamic properties of existing structures without utilizing the analytical models. The ambient vibration testing could be used on any type of frame such as concrete, steel and masonry to investigate the structural vulnerability. The method could be the first stage and necessarily for the retrofit process. To achieve this aim, the ambient vibration testing can...
متن کاملDifficulty Adjustable and Scalable Constrained Multi-objective Test Problem Toolkit
In order to better understand the advantages and disadvantages of a constrained multi-objective evolutionary algorithm (CMOEA), it is important to understand the nature of difficulty of a constrained multi-objective optimization problem (CMOP) that the CMOEA is going to deal with. A CMOP includes objectives and constraints, and a number of features, such as the multi-modality and the degeneracy...
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ژورنال
عنوان ژورنال: Journal of the Japan Society for Aeronautical and Space Sciences
سال: 1987
ISSN: 0021-4663
DOI: 10.2322/jjsass1969.35.447