This paper reports the structural design of a new high-performance robot arm. Design objectives for the new arm include large (1-2 meter) workspace, low weight, 5 kg payload capacity, high stiiness, high structural vibration frequencies, precise joint-level torque control, a total of three degrees-of-freedom, and mechanical simplicity. A comparative analysis is reported for four very diierent t...

This paper reports the structural design of a new highperformance robot arm. Design objectives for the new arm include large (1-2 meter) workspace, low weight, 5 kg payload capacity, high sti ness, high structural vibration frequencies, precise joint-level torque control, a total of three degrees-offreedom, and mechanical simplicity. A comparative analysis is reported for four very di erent two...

This paper investigates the main factors influencing the design of a vibrotactile feedback device for the human arm. Beside the determination of hardware settings, e.g. vibration motor type (pancake or cylindrical) and intensity threshold, this paper concentrates on the determination of spatial acuity and the division of the arm’s perimeter into sectors which can be distinguished reliably. The ...

Two neutrally buoyant intruder particles in a granular bed fluidized by vertical, sinusoidal vibration are known to interact with each other over a range of about five intruder diameters. Using molecular dynamics simulations, we investigate in detail the spatial and temporal nature of this interaction. We show that the force of attraction between intruders can be calculated from the local densi...

The hand-tool coupling force in the operation of a vibrating tool is generally composed of applied force (AF) and biodynamic force (BF). There is wide interest in quantifying the coupling force. The objectives of this study are to develop an effective method for estimating the BF and to investigate its fundamental characteristics. Using the biodynamic response of the hand-arm system, such as ap...

The objectives of this study are to determine the prevalence of hand-arm vibration syndrome (HAVS) and the characteristics of the vibrotactile perception threshold (VPT) among users of hand-held vibrating tools working in a tropical environment. A cross sectional study was done among 47 shipyard workers using instruments and a questionnaire to determine HAVS related symptoms. The vibration acce...

A Raman study of a back gated bilayer graphene sample is presented. The changes in the Fermi level induced by charge transfer splits the Raman G band, hardening its higher component and softening the lower one. These two components are associated with the symmetric (S) and antisymmetric vibration (AS) of the atoms in the two layers, the later one becoming Raman active due to inversion symmetry ...

This study investigated the human fatigue caused by automobile steering wheel vibration. Discomfort data was collected from 15 subjects using a steering wheel vibration bench. A rigid wheel was used to apply sinusoidal rotational excitation of 0.08 m/s and 0.1 m/s amplitude at test frequencies of 4, 8, 16 and 32 Hz. Human discomfort was quantified after periods of 1, 5 and 10 minutes by means o...

Many vibration-exposed workers have been found to suffer from muscle fatigue and decreased grip strength. Therefore in order to quantify and determine safe levels of human exposure to vibration, measurements and analysis of significance vibration factors are necessary. There are three main objectives in this study. The first one is to investigate the characteristics of vibration factors (vibrat...

The objective of this study is to investigate the basic characteristics of the three axis mechanical impedances distributed at the fingers and palm of the hand subjected to vibrations along the three orthogonal directions (xh, yh, and zh). Seven subjects participated in the experiment on a novel threedimensional (3-D) hand-arm vibration test system equipped with a 3-D instrumented handle. The t...