The use of forklifts to move material is very common in large manufacturing companies. Exposure to whole body vibration from industrial vehicles such as forklifts has been associated with low back pain and also with the degeneration of intervertebral disc. Predicted health risks, associated with the operation of forklifts, based on ISO 2631-1 criteria are limited and have not yet been determine...

The JCAA/JG-PP Lead-Free Study evaluated solder capabilities by direct comparison of time-to-failure for components exposed to identical conditions. The initial comparison showed mixed results in solder type rankings for identical components. A stronger solder type for one position occasionally was a weaker solder type in another location. This report summarizes results of life-use methods (fat...

In the manufacturing industry, lots of rapid point-to-point motion is required while the residual vibration is unfavorable. Residual vibrations caused by flexible elements are limiting the performance of mechanical system, especially when the system needs to make rapid point-to-point motion. As proved in earlier studies, avoiding natural frequencies of the mechanical system reduces the residual...

The usual specification of acceleration (in number of g’s) as the injury criterion in the biodynamic response of the human body to vibration and/or shock is quite misleading if not invalid. An injury criterion based on stress (or strain) is proposed and shown to have the potential of deciding where, w/ten and how injury is sustained. An example in pilot ejection is used for illustration.

Vibroacoustic therapy is a new sound technology that uses audible sound vibrations to reduce symptoms, invoke relaxation, and alleviate stress. This technology is developed based on the recognition that external vibration can influence body function. Research demonstrates the effectiveness of vibroacoustic therapy. Implications for nurses include investigating the possibilities of vibroacoustic...

In order to quantify tractor driver Whole-Body Vibration (WBV) induced by some of the agricultural operations, the ISO 2631 standard was utilized. Detailed methodology of the calculation of the WBV evaluating indices using the time-domain acceleration data analysis was presented. According to the results of the study, typical weighted root mean square (WRMS) value of the Z-axis vibration was mo...

The effect of organismic variable age on human cognitive performance was studied under the impact of vibration in different automobile driving environments, namely city streets, rural roads and highways. Reaction time was measured in milliseconds through a human response measurement system specifically designed for the purpose. Results of the study showed that age had a significant effect in ci...

This study presents a modified continuum model to investigate the vibration behavior of single and multi-carbon nanotubes (CNTs). Two parameters are exploited to consider size dependence; one derived from the energy equivalent model and the other from the modified couple stress theory. The energy equivalent model, derived from the basis of molecular mechanics, is exploited to describe size-depe...

This paper discusses a prognostics methodology for assessing the remaining life of a group of electronic components mounted on a circuit board using a single accelerometer to monitor the life-cycle vibration loads. The accelerometer captures the global circuit board response to enable all components on the circuit board to be analyzed. A case study is presented using a single accelerometer moun...

Results from laboratory tests with impact loaded young concrete prisms are evaluated using a finite element model. The application of the dynamic load from an impacting hammer is used as with previously tested models, but here are 3D solid elements used. A non-linear material model is also implemented, capable of describing cracking during stress wave propagation. The position and width of crac...