نتایج جستجو برای: hydroelastic vibration

تعداد نتایج: 50467  

Journal: :international journal of occupational hygiene 0
farough mohammadian parvin nasiri omid giahi zahra rezvani mehdi kangavari athena rafieepour

original article   noise and vibration are the common problems in industrialized countries which can affect individual's job performance. the present study aimed to investigate the combination of the whole body vibration and the noise and their effects on the students' mental performance in the laboratory setting. twenty male students of tehran university of medical sciences, tehran, iran were ...

2010
Yimin Zhang Xianzhen Huang

Generally speaking, a vibration system consists of three parts: vibration resource, vibration transfer path, and vibration receiver. Based on the dynamic sensitivity technique, this paper proposes a method for evaluating the contribution of each vibration transfer path to the dynamic response of the vibration receiver. Nonlinear stiffness is an important factor in causing the nonlinearity of vi...

Journal: :ماشین های کشاورزی 0
حمید قربانپور محمد هادی خوش تقاضا محمدرضا مستوفی سرکاری

manual citrus harvesting is commonly performing hard, expensive and time consuming. in this study, a factorial experiment with a completely randomized design in three replications was performed to find out the effect of frequency (three levels of 5, 7.5 and 10 hz), vibration time (three levels of 10, 15 and 20 seconds) on harvesting capacity and losses of thomson cultivar of orange. the results...

Journal: :مهندسی بیوسیستم ایران 0
فیض اله شهبازی استادیار، دانشکدۀ کشاورزی، دانشگاه لرستان سعید محمدزاده استادیار، دانشکده کشاورزی دانشگاه لرستان

improper transportation of agricultural materials causes mechanical damage to them. the damage isdepended to the physical and mechanical properties of the product and properties of the appliedforce. vibration generated by vehicles during road transportation causes shake the product, contactit with carrier bin and other components, tissues deformation and damage to product. this researchwas cond...

Journal: :مجله علوم کشاورزی ایران 0
احمد تقی زاده علی سرایی تیمور توکلی هشتجین برات قبادیان

whole body vibration can deteriorate health bringing about or back pain or spinal column injury, resulted from continuing exposure to vibration. also exposure to vibration can cause disorder in central nervous system and adversely influence vascular and skeletal systems. in this research, the vibration of universal 650m tractor seat and its effect on the operator in five levels of engine speeds...

Journal: :IOP conference series 2023

Abstract The study investigates the phenomenon of wave diffraction by multiple poroelastic plates in infinitely deep water using two-dimensional linearized potential theory. focuses on numerically computing reflection and transmission coefficients Galerkin approximations specifically designed for two nonidentical vertical plates. By varying separation lengths, porosity, flexural rigidity plates...

2004

Basic Terminology of Structural Vibration The term vibration describes repetitive motion that can be measured and observed in a structure. Unwanted vibration can cause fatigue or degrade the performance of the structure. Therefore it is desirable to eliminate or reduce the effects of vibration. In other cases, vibration is unavoidable or even desirable. In this case, the goal may be to understa...

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