vibration generated by vehicles during road transport has an important impact on agricultural products' damage process, particularly in the case of fruits and vegetables. modulus of elasticity is one of the most conspicuous mechanical properties of fruits, the variation in which can be described as one of the most affecting damage criteria during transportation. this research was conducted...

A detailed methodology to develop a digital twin has many useful applications in the era of technology 4.0. This study provides framework for vibration prediction and fatigue life prognosis vertical oil well drillstring. The nature severity down-hole vibrations are identified estimated based on vibrational operational parameter measurements made at surface level. Because difficulty accessing fu...

the purpose of this study was to assess exposure to hand-arm vibration in tiller users, forty users of tiller in northeastern provinces of iran were examined to measure hand-arm vibration parameters such as root mean square acceleration (rms), total equivalent acceleration, vibration dose value (vdv) and crest factor in three directions (x, y, and z) and various operating modes for comparing th...

To eliminate or reduce stick–slip vibration in torsional of the drilling string and improve rate penetration (ROP), a model considering ROP was established based on multidimensional string. The verified by simulation analysis. characteristics three stages stationary, slip, stick were analyzed. This paper investigated influence rotary torque, speed, weight bit (WOB) vibrations drill Based this, ...

This paper extends the approach proposed by Richard et al (2007) to analyze the axial and torsional vibrations of drilling systems that are excited by the particular boundary conditions at the drag bit-rock interface, by basing the formulation of the model on a continuum representation of the drillstring rather than on a characterization of the drilling structure by a two degree of freedom syst...

background many industrial devices have an excessive vibration which can affect human body systems. the effect of vibration on cochlear histology has been as a debatable problem in occupational health and medicine. objectives due to limitation present in human studies, the research was conducted to survey the influence of vibration on cochlear histology in an animal model. materials and methods...