Transmission of vibration to the wrist and comparison of frequency response function estimators

Seppo Aatola

Research output: Contribution to journalArticleScientificpeer-review

16 Citations (Scopus)

Abstract

The purpose of this study was to find the resonance frequencies of the hand, the relations between resonance frequencies and hand-grip force, and between transmission of vibration and hand-grip force, and to compare different frequency response function estimators.
The vibration accelaration was measured from the handle and from the wrist in both laboratory and field conditions. The laboratory measurements were made with five research workers as test subjects using five hand-grip forces and three handle vibration levels. Vibration excitation was sinusoidal sweep from 10 to 400 Hz. Field measurements were made from five professional forest workers who were cutting discs from a tree with chain saws manufactured in 1958, 1972 and 1980.
Three resonance frequencies were found which increased linearly with increasing hand-grip force. The transmission of vibration to the wrist increased linearly with increasing hand-grip force at frequencies over 100 Hz. Three frequency response function estimators were calculated which seemed to be fairly equal if the coherence function was better than 0·8.
The minimum boundary of normalized random error function for frequency response functions was calculated.
Original languageEnglish
Pages (from-to)497-507
JournalJournal of Sound and Vibration
Volume131
Issue number3
DOIs
Publication statusPublished - 1989
MoE publication typeA1 Journal article-refereed

Fingerprint

wrist
estimators
frequency response
Frequency response
vibration
error functions
Random errors
random errors
excitation

Cite this

@article{72d3b36e8bdc41bcbe713c2a87960e0d,
title = "Transmission of vibration to the wrist and comparison of frequency response function estimators",
abstract = "The purpose of this study was to find the resonance frequencies of the hand, the relations between resonance frequencies and hand-grip force, and between transmission of vibration and hand-grip force, and to compare different frequency response function estimators. The vibration accelaration was measured from the handle and from the wrist in both laboratory and field conditions. The laboratory measurements were made with five research workers as test subjects using five hand-grip forces and three handle vibration levels. Vibration excitation was sinusoidal sweep from 10 to 400 Hz. Field measurements were made from five professional forest workers who were cutting discs from a tree with chain saws manufactured in 1958, 1972 and 1980. Three resonance frequencies were found which increased linearly with increasing hand-grip force. The transmission of vibration to the wrist increased linearly with increasing hand-grip force at frequencies over 100 Hz. Three frequency response function estimators were calculated which seemed to be fairly equal if the coherence function was better than 0·8. The minimum boundary of normalized random error function for frequency response functions was calculated.",
author = "Seppo Aatola",
year = "1989",
doi = "10.1016/0022-460X(89)91009-2",
language = "English",
volume = "131",
pages = "497--507",
journal = "Journal of Sound and Vibration",
issn = "0022-460X",
publisher = "Elsevier",
number = "3",

}

Transmission of vibration to the wrist and comparison of frequency response function estimators. / Aatola, Seppo.

In: Journal of Sound and Vibration, Vol. 131, No. 3, 1989, p. 497-507.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Transmission of vibration to the wrist and comparison of frequency response function estimators

AU - Aatola, Seppo

PY - 1989

Y1 - 1989

N2 - The purpose of this study was to find the resonance frequencies of the hand, the relations between resonance frequencies and hand-grip force, and between transmission of vibration and hand-grip force, and to compare different frequency response function estimators. The vibration accelaration was measured from the handle and from the wrist in both laboratory and field conditions. The laboratory measurements were made with five research workers as test subjects using five hand-grip forces and three handle vibration levels. Vibration excitation was sinusoidal sweep from 10 to 400 Hz. Field measurements were made from five professional forest workers who were cutting discs from a tree with chain saws manufactured in 1958, 1972 and 1980. Three resonance frequencies were found which increased linearly with increasing hand-grip force. The transmission of vibration to the wrist increased linearly with increasing hand-grip force at frequencies over 100 Hz. Three frequency response function estimators were calculated which seemed to be fairly equal if the coherence function was better than 0·8. The minimum boundary of normalized random error function for frequency response functions was calculated.

AB - The purpose of this study was to find the resonance frequencies of the hand, the relations between resonance frequencies and hand-grip force, and between transmission of vibration and hand-grip force, and to compare different frequency response function estimators. The vibration accelaration was measured from the handle and from the wrist in both laboratory and field conditions. The laboratory measurements were made with five research workers as test subjects using five hand-grip forces and three handle vibration levels. Vibration excitation was sinusoidal sweep from 10 to 400 Hz. Field measurements were made from five professional forest workers who were cutting discs from a tree with chain saws manufactured in 1958, 1972 and 1980. Three resonance frequencies were found which increased linearly with increasing hand-grip force. The transmission of vibration to the wrist increased linearly with increasing hand-grip force at frequencies over 100 Hz. Three frequency response function estimators were calculated which seemed to be fairly equal if the coherence function was better than 0·8. The minimum boundary of normalized random error function for frequency response functions was calculated.

U2 - 10.1016/0022-460X(89)91009-2

DO - 10.1016/0022-460X(89)91009-2

M3 - Article

VL - 131

SP - 497

EP - 507

JO - Journal of Sound and Vibration

JF - Journal of Sound and Vibration

SN - 0022-460X

IS - 3

ER -