A redundant accelerometric cluster for the measurement of translational and angular acceleration and angular velocity of the head

Paolo Cappa, Fabrizio Patanè, Stefano Rossi

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

This paper reports the development and the experimental verification of a new helmet based on the use of a redundant array of accelerometers (ACs) which enables the measurement of angular velocity, angular acceleration and translational (a-g) component of the head during normal activity through an unconstrained workspace. Taking into account the outcome of a numerical simulation previously conducted, a lightweight foam bicycle helmet is equipped with ten biaxial, low-cost MEMS ACs. Validation tests were carried out by means of an instrumented pendulum, which allows the evaluation of the accuracy in the measurement of angular velocity, angular acceleration and (a-g) component over a range of 300 deg/s, 1300 deg/s2, and 7 m/s2. The effects induced by the sensor redundancy in the metrological performances of the helmet were also analyzed; in fact, by adopting an optimal selection criterion, some of the cemented ACs were ignored in the data processing, so that, in addition to the 20 axis configuration, also the clusters equipped by a total number of 18, 16, 14, or 12 sensing axes were analyzed and comparatively examined. The results clearly indicate that the redundancy reduces the effect of the noise level of the single transducers to the acceleration measurements; consequently the bandwidth of the device may be increased, because higher cutoff frequency can be chosen for the low pass filtering. The redundancy is also useful to reduce the angular velocity drift that is further decreased by adopting a drift compensation method. The results of the present experiments revealed that the presented helmet can be considered a viable tool in the measurement of head angular and translational acceleration for the assessment of equilibrium control capability. In case the evaluation of the angular velocity is required, time-limited routine clinical application (few seconds) must be performed due to the presence of relevant drift.

Original languageEnglish
Pages (from-to)14-22
Number of pages9
JournalJournal of Medical Devices, Transactions of the ASME
Volume1
Issue number1
DOIs
Publication statusPublished - Mar 2007

Fingerprint

Head Protective Devices
Angular velocity
Head
Accelerometers
Redundancy
Micro-Electrical-Mechanical Systems
Acceleration measurement
Bicycles
Cutoff frequency
Pendulums
Transducers
Compensation and Redress
Patient Selection
MEMS
Foams
Noise
Bandwidth
Costs and Cost Analysis
Equipment and Supplies
Sensors

ASJC Scopus subject areas

  • Biomedical Engineering
  • Medicine (miscellaneous)

Cite this

A redundant accelerometric cluster for the measurement of translational and angular acceleration and angular velocity of the head. / Cappa, Paolo; Patanè, Fabrizio; Rossi, Stefano.

In: Journal of Medical Devices, Transactions of the ASME, Vol. 1, No. 1, 03.2007, p. 14-22.

Research output: Contribution to journalArticle

@article{dabeaa30d3fb41ba804328069cc6ae8e,
title = "A redundant accelerometric cluster for the measurement of translational and angular acceleration and angular velocity of the head",
abstract = "This paper reports the development and the experimental verification of a new helmet based on the use of a redundant array of accelerometers (ACs) which enables the measurement of angular velocity, angular acceleration and translational (a-g) component of the head during normal activity through an unconstrained workspace. Taking into account the outcome of a numerical simulation previously conducted, a lightweight foam bicycle helmet is equipped with ten biaxial, low-cost MEMS ACs. Validation tests were carried out by means of an instrumented pendulum, which allows the evaluation of the accuracy in the measurement of angular velocity, angular acceleration and (a-g) component over a range of 300 deg/s, 1300 deg/s2, and 7 m/s2. The effects induced by the sensor redundancy in the metrological performances of the helmet were also analyzed; in fact, by adopting an optimal selection criterion, some of the cemented ACs were ignored in the data processing, so that, in addition to the 20 axis configuration, also the clusters equipped by a total number of 18, 16, 14, or 12 sensing axes were analyzed and comparatively examined. The results clearly indicate that the redundancy reduces the effect of the noise level of the single transducers to the acceleration measurements; consequently the bandwidth of the device may be increased, because higher cutoff frequency can be chosen for the low pass filtering. The redundancy is also useful to reduce the angular velocity drift that is further decreased by adopting a drift compensation method. The results of the present experiments revealed that the presented helmet can be considered a viable tool in the measurement of head angular and translational acceleration for the assessment of equilibrium control capability. In case the evaluation of the angular velocity is required, time-limited routine clinical application (few seconds) must be performed due to the presence of relevant drift.",
author = "Paolo Cappa and Fabrizio Patan{\`e} and Stefano Rossi",
year = "2007",
month = "3",
doi = "10.1115/1.2355685",
language = "English",
volume = "1",
pages = "14--22",
journal = "Journal of Medical Devices, Transactions of the ASME",
issn = "1932-6181",
publisher = "American Society of Mechanical Engineers(ASME)",
number = "1",

}

TY - JOUR

T1 - A redundant accelerometric cluster for the measurement of translational and angular acceleration and angular velocity of the head

AU - Cappa, Paolo

AU - Patanè, Fabrizio

AU - Rossi, Stefano

PY - 2007/3

Y1 - 2007/3

N2 - This paper reports the development and the experimental verification of a new helmet based on the use of a redundant array of accelerometers (ACs) which enables the measurement of angular velocity, angular acceleration and translational (a-g) component of the head during normal activity through an unconstrained workspace. Taking into account the outcome of a numerical simulation previously conducted, a lightweight foam bicycle helmet is equipped with ten biaxial, low-cost MEMS ACs. Validation tests were carried out by means of an instrumented pendulum, which allows the evaluation of the accuracy in the measurement of angular velocity, angular acceleration and (a-g) component over a range of 300 deg/s, 1300 deg/s2, and 7 m/s2. The effects induced by the sensor redundancy in the metrological performances of the helmet were also analyzed; in fact, by adopting an optimal selection criterion, some of the cemented ACs were ignored in the data processing, so that, in addition to the 20 axis configuration, also the clusters equipped by a total number of 18, 16, 14, or 12 sensing axes were analyzed and comparatively examined. The results clearly indicate that the redundancy reduces the effect of the noise level of the single transducers to the acceleration measurements; consequently the bandwidth of the device may be increased, because higher cutoff frequency can be chosen for the low pass filtering. The redundancy is also useful to reduce the angular velocity drift that is further decreased by adopting a drift compensation method. The results of the present experiments revealed that the presented helmet can be considered a viable tool in the measurement of head angular and translational acceleration for the assessment of equilibrium control capability. In case the evaluation of the angular velocity is required, time-limited routine clinical application (few seconds) must be performed due to the presence of relevant drift.

AB - This paper reports the development and the experimental verification of a new helmet based on the use of a redundant array of accelerometers (ACs) which enables the measurement of angular velocity, angular acceleration and translational (a-g) component of the head during normal activity through an unconstrained workspace. Taking into account the outcome of a numerical simulation previously conducted, a lightweight foam bicycle helmet is equipped with ten biaxial, low-cost MEMS ACs. Validation tests were carried out by means of an instrumented pendulum, which allows the evaluation of the accuracy in the measurement of angular velocity, angular acceleration and (a-g) component over a range of 300 deg/s, 1300 deg/s2, and 7 m/s2. The effects induced by the sensor redundancy in the metrological performances of the helmet were also analyzed; in fact, by adopting an optimal selection criterion, some of the cemented ACs were ignored in the data processing, so that, in addition to the 20 axis configuration, also the clusters equipped by a total number of 18, 16, 14, or 12 sensing axes were analyzed and comparatively examined. The results clearly indicate that the redundancy reduces the effect of the noise level of the single transducers to the acceleration measurements; consequently the bandwidth of the device may be increased, because higher cutoff frequency can be chosen for the low pass filtering. The redundancy is also useful to reduce the angular velocity drift that is further decreased by adopting a drift compensation method. The results of the present experiments revealed that the presented helmet can be considered a viable tool in the measurement of head angular and translational acceleration for the assessment of equilibrium control capability. In case the evaluation of the angular velocity is required, time-limited routine clinical application (few seconds) must be performed due to the presence of relevant drift.

UR - http://www.scopus.com/inward/record.url?scp=42549142269&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=42549142269&partnerID=8YFLogxK

U2 - 10.1115/1.2355685

DO - 10.1115/1.2355685

M3 - Article

AN - SCOPUS:42549142269

VL - 1

SP - 14

EP - 22

JO - Journal of Medical Devices, Transactions of the ASME

JF - Journal of Medical Devices, Transactions of the ASME

SN - 1932-6181

IS - 1

ER -