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Human Body Vibration

Human body vibration module measures the effect of vibration on the human. The extracted parameters allow the judgment of risk of injuries for workers, exposed to vibration. Whole-body and hand-arm measurement are supported according to all relevant international standards.

IEPE
IEPE
Charge
Charge
Voltage
Voltage
Vibrations
Vibrations
CAN bus
CAN bus
CAN FD
CAN FD
OBDII
OBDII
J1939
J1939
XCP/CCP
XCP/CCP
FlexRay
FlexRay
Video
Video
High-speed video
High-speed video
GPS/GLONASS
GPS/GLONASS
Inertial platforms
Inertial platforms
Gyroscope
Gyroscope

Main Features

  • SUPPORTED STANDARDS: ISO 5349, ISO 8041, ISO 2631-1 and ISO 2631-5.
  • WHOLE BODY VIBRATION: applicable to motions transmitted from workplace machines and vehicles to the human body through a supporting surface
  • HAND ARM VIBRATION: sensors are installed on special adapters for holding them on a handle or between fingers
  • ADVANCED MATH: all data like RMS, Peak, Crest, VDV, MSDV, MTVV, Weighted raw, al(ISO 2631-5), D(ISO 2631-5) are available
  • DATA ANALYSIS: limitless combination with other standard tools of Dewesoft is a great base for R&D work related to the reduction of the vibration due to its deep data analysis functionality

Whole Body Measurement

Human exposure to whole-body vibration should be evaluated using the method defined in ISO 2631-1:1997. Whole-body vibration is applicable to motions transmitted from workplace machines and vehicles to the human body through a supporting surface. For health and safety evaluations, this is through the buttocks and feet of a seated person or the feet of a standing person.

Hand-arm Measurement

Hand-arm vibration is experienced through the hand and arm. Daily exposure to hand-arm vibration over a number of years can cause permanent physical damage, usually resulting in what is commonly known as “white finger syndrome”, or it can damage the joints and muscles of the wrist and/or elbow.

Measurement of hand-arm vibration refers to three main cases:
• when the operator's hands have direct contact with the surface of the vibrating machine (steering wheel or handle),
• when the operator feeds the machine with the material through which the vibration is transmitted to a hand (wood cutting),
• when the operator holds the vibrating device in hands (drills, pneumatic hammers).

Calculated Parameters

Parameters can be calculated either as overall values, which means that we have only one value at the end of the measurement, and/or interval logged values. If we have an interval logged values, the time interval for logging is defined in seconds.

  • RMS - a statistical measure of the magnitude of a weighted signal
  • Peak - maximum deviation of the signal from the zero line
  • Crest - the ratio between the peak and RMS
  • VDV -  fourth power vibration dose value
  • MSDV - motion sickness dose value
  • MTVV - maximum transient vibration value, calculated at a one-second interval

Measurement of SEAT - Seat Effective Amplitude Transmissibility

Determination of SEAT does not directly give information about human exposure to vibration. The goal of the measurement is to determine the capability of a seat design to attenuate the vibrations present in a vehicle - to protect the driver from excessive vibrations.

The measurement, therefore, involves a determination of the vibration magnitude at two positions (SEAT is computed as the ratio between these two magnitudes):

  • On the seat pan
  • Directly on the floor of the vehicle right underneath the seat.

 

Lumbar Spine Measurement

The adverse health effects of prolonged exposure to vibration that includes multiple shocks are related to dose measures.

The calculation of the lumbar spine response described in ISO 2631 assumes that the person subjected to the vibration is seated in an upright position and does not voluntarily rise from the seat during the exposure. Different postures can result in different responses in the spine.

The determination of the spinal response acceleration dose involves the following steps:

  • calculation of the human response
  • counting of number and magnitudes of peaks
  • calculation of an acceleration dose by application of a dose model related to the Palmgren-miner fatigue theory

Free Online Training

You can learn more about sound level measurement at Dewesoft PRO online training by navigating to the Human Body Vibrations PRO training course.

Dewesoft PRO training is a free online training for measurement professionals. Learn how to measure signals, data processing and how to use Dewesoft products. Online PRO training is completely free. 

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