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Difference between revisions of "Human Vibration"
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→Hand-Arm Measurement
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====Hand-Arm Measurement==== | ====Hand-Arm Measurement==== | ||
Measurement procedures for hand-arm vibration evaluation are | Measurement procedures for hand-arm vibration evaluation are described in the ISO 5349. This type of vibration is transmitted to the body by the hands and the amrs when using hand-tools and equipment, holding a vibrating object (like the steering wheel in a vehicle), or feeding a machine (wood cutting or turning).<br> | ||
Here, the direction of the sensor is not important, however, at least two directions must be acquired at each point in the direction perpendicular to the handle axis. The most important part is to measure vibration at the contact point of the hand and the tool. Specific adaptor can be used to hold the accelerometer with the handle. | Here, the direction of the sensor is not important, however, at least two directions must be acquired at each point in the direction perpendicular to the handle axis. The most important part is to measure vibration at the contact point of the hand and the tool. Specific adaptor can be used to hold the accelerometer with the handle. | ||
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The length of the measurement should be representative of the whole exposure duration during a day. Therefore, it can vary from very short measurement (when feeding the machine) to longer measurement (steering wheel). <br> | The length of the measurement should be representative of the whole exposure duration during a day. Therefore, it can vary from very short measurement (when feeding the machine) to longer measurement (steering wheel). <br> | ||
Using the OROS tool kit, long signals file can be take a lot of time to | Using the OROS tool kit, long signals file can be take a lot of time to analyze. In order to analyze signal files longer than 30 minutes, we advise to : <br> | ||
* reduce the Sampling rate, as frequency bandwidth for Whole-body vibration will note exceed 1kHz. | * reduce the Sampling rate, as frequency bandwidth for Whole-body vibration will note exceed 1kHz. | ||
* Split each sensors over several files | * Split each sensors over several files | ||