Vibration Dose Measurement with Gripping Force and Orientation
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Solution Overview
Problem
Existing vibration dose measurement apparatuses for machine operators do not adequately account for factors such as hand position, orientation, gripping force, and variations in vibration direction and magnitude, which are crucial in assessing the risk of vibration-induced injuries like VWF or HAVS.
Innovation Solution
A vibration dose measurement apparatus incorporating a sensor assembly with an accelerometer for linear motion, a gyroscope for rotary motion, and a gripping force sensor, integrated into a flexible support that can be secured around the operator's hand, which also includes a processor to calculate a modified A(8) value considering gripping force and orientation, and provides real-time alerts and data logging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If only an accelerometer is used to measure vibration magnitude, then the measurement is simple, but the assessment of vibration risk is incomplete because it does not account for rotational components, gripping force, hand orientation, and vibration direction
Solution Approach 1:
The patent combines multiple sensors (accelerometer, gyroscope, gripping force sensor) into a single integrated sensor assembly that is mounted together on a common support structure. This merging of multiple measurement functions into one unified device enables comprehensive vibration risk assessment while maintaining a compact form factor that can be worn by operators.
Solution Approach 2:
The sensor assembly is designed to perform multiple measurement functions simultaneously: linear vibration measurement (accelerometer), rotational vibration measurement (gyroscope), and gripping force measurement (force sensor). This multi-functionality allows a single device to assess comprehensive vibration risk including magnitude, direction, orientation, and exposure duration.
2Loss of information
If a simple accelerometer-based apparatus is used, then the device is easy to operate, but it cannot provide information about hand position, orientation, gripping force, or vibration direction variations
Solution Approach 1:
The sensor assembly automatically captures multiple vibration parameters (linear acceleration, rotational motion, gripping force) without requiring manual input or adjustment by the operator. The processor automatically integrates data from all sensors and calculates comprehensive vibration dose metrics, eliminating the need for operator intervention while providing complete exposure information.
Solution Approach 2:
The apparatus provides real-time feedback to the operator through visual or audible alerts when vibration exposure thresholds are exceeded. The system continuously monitors all vibration parameters and immediately notifies the operator of hazardous conditions, enabling timely protective actions without requiring the operator to interpret complex data.
3Reliability
If multiple sensors are integrated into the apparatus, then comprehensive vibration data is captured, but the device structure becomes more complex requiring integration into support structures like gloves or straps
Solution Approach 1:
The support structure incorporates flexible materials such as elastic bands, straps, or glove-like structures that can conform to the operator's hand and wrist. This flexibility allows the sensor assembly to be securely positioned against the palm while maintaining comfort and ease of wear, despite the integrated complexity of multiple sensors.
Solution Approach 2:
The apparatus is divided into separate functional modules: the sensor assembly containing multiple sensors, the support structure for mounting, and the processor for data analysis. This segmentation allows each component to be optimized independently while maintaining overall system reliability and ease of assembly.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution provides a more accurate assessment of vibration exposure by accounting for rotational components and gripping force, reducing the risk of underestimating hazardous exposure and enabling timely interventions to prevent injuries.
Implementation Method 1
an accelerometer operable to detect linear motion
Implementation Method 2
a gyroscope operable to detect rotary motion
Implementation Method 3
a gripping force sensor operable to detect gripping force applied by the operator
Data Source
AI summary
A vibration dose measurement apparatus 10 for an operator's hand 1 comprises a sensing assembly 20 connected to a control unit 25. The sensing assembly 20 comprises an accelerometer 21, gyroscope 22, and gripping force sensor 23 and may be packaged within a protective housing (not shown). By monitoring output of the sensor assembly 20, the vibration dose experienced by the hand 1 can be estimated. In the present invention, the provision of gripping force sensor 23 allows for vibration dose measurement to be adjusted based on the output of gripping force sensor 23. This can therefore take into account the force applied by an operator in gripping machinery, which can impact significantly on the effective vibration dose.