Multi-point independent simultaneous force measurements were made to investigate the vibration force distribution on the palm and to determine one representative point on it for the purpose of field survey. The phase relationships between the force and the acceleration were also pursued. In connection with vibration force transmission, important effects such as vector, bypassing and mechanical ...

PATIENT discomfort in restorative dentistry has been attributed mainly to the two factors of heat generation and the vibration produced during the cutting operation on the tooth. A review of the literature, however, gives little information on either the extent or chief source of vibrations. Gabel reported that the chisel produced the least pain of any instrument used to cut dentin. While the r...

For application of porous and granular materials to vibro-acoustic controls, a finite dynamic strength of the solid component (frame) is an important design factor. The primary goal of this study was to investigate structural vibration damping through this frame wave propagation for various poroelastic materials. A measurement method to investigate the vibration characteristics of the frame was...

Human exposure to whole-body vibration (WBV) has been associated with a variety of changes in health, comfort, and occupational functioning. In the C-130J Hercules aircraft, crews from both Australia and overseas have reported that the vibration in the cargo compartment of the aircraft exceeds previous levels and that it is both annoying and fatiguepromoting. This report examines the issue of h...

Vehicle drivers receive tactile feedback from steering-wheel vibration that depends on the frequency and magnitude of the vibration. From an experiment with 12 subjects, equivalent comfort contours were determined for vertical vibration of the hands at two positions with three grip forces. The perceived intensity of the vibration was determined using the method of magnitude estimation over a ra...

Since there are backlash friction and time-varying stiffness, the characteristics of gear pair has strong nonlinearity. When a gear has faults such as pitting, spalling and tooth breakage, there are often some nonlinear characteristics as super-harmonics or sub-harmonics along with vibration signal. These characteristics will cause some difficulty for fault diagnostics, so it is necessary to st...

The aim of this paper is to conduct experimental modal analysis and numerical simulation to verify the structural characteristics of a deployable-retractable wing for aircraft and spacecraft. A modal impact test was conducted in order to determine the free vibration characteristics. Natural frequencies and vibration mode shapes were obtained via measurement in LMS Test. Lab. The frequency respo...

This paper reports the mechanical design, structural analysis, and experimental veri cation of a new high performance semi-direct drive robot arm. A design optimization methodology employing nite element analysis (FEA) is reviewed, and a resulting arm design is reported. FEA simulations of the nal design predict high structural vibration frequencies throughout the arms workspace. Extensive stru...

OBJECTIVES The purpose of this study was to determine exposure to whole-body vibration (WBV) and mechanical shock in rural workers who use quad bikes and to explore how personal, physical, and workplace characteristics influence exposure. METHODS A seat pad mounted triaxial accelerometer and data logger recorded full workday vibration and shock data from 130 New Zealand rural workers. Persona...