ISO 10068:2012 pdf download.Mechanical vibration and shock -Mechanical impedance of the human hand-arm system at the driving point.
ISO 10068 specifies the mechanical impedance of the human male hand-arm system at the driving point. Values of the impedance, expressed as modulus and phase, are provided for three orthogonal, translatory directions of excitation that correspond to the Xh-, Yh- and zh-axes of the basicentric coordinate system.
NOTE 1 The basicentric coordinate system is defined in ISO 5349lF2] and ISO 8727.
The Xh-, Yh- and zh-components of impedance are defined as a function of frequency, from 10 Hz to 500 Hz, for specified arm positions, grip and feed forces, handle diameters, and intensities of excitation.
The components of impedance in the three directions are treated as being independent.
ISO 10068 can be used to define typical values of the mechanical impedance of the hand-arm system at the driving point, applicable to males under the circumstances specified. This International Standard can provisionally be applied to females.
Reference values of the mechanical impedance at the driving point are provided as a function of frequency for a specified grip and feed force.
NOTE 2 See Annex A.
These impedance values are intended for the determination of the transmissibility of resilient materials when loaded by the hand-arm system.
Mathematical representations of the hand-arm system that model the mean values of apparent mass or impedance are provided.
NOTE 3 See Annexes B to D.
A gloved hand-arm model is described, and the frequency dependence of vibration power absorption in the hand-arm system is also provided.
NOTE 4 See Annexes E and F.
To help conduct further measurement of the mechanical impedance, especially for circumstances that are not specified in ISO 10068, information on the measurement of mechanical impedance is provided.
2 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
mechanical impedance of the hand-arm system at the driving point
complex ratio of the dynamic force F acting on the hand contact surface and the vibration velocity input v to the hand, given by the equation Zh(w) = F(w)/v(w) [Equation (1)], where w is the vibration frequency in radians per second
3 Mechanical impedance of the handarm system at the driving point
The modulus and phase of the mechanical impedance of the hand-arm system at the driving point are given in Tables ito 3 and (for illustration) in Figures ito 3 at one-third-octave band centre frequencies, for three orthogonal directions of excitation. The directions correspond to the Xh-,Yh- and zh-axes of the basicentric coordinate system for the hand (see Figure 5). Each table and figure contains three values of modulus and phase at each frequency, for each direction of motion, to reflect the range of values measured on male hands. The upper and lower values define the range of most probable values of impedance. The third value represents an overall mean of the human data, and defines the target value for all applications. The upper and lower limiting values at each frequency encompass the mean values of all data sets selected, and are shown by bold continuous curves in Figures ito 3. The central value at each frequency, shown by dashed curves in Figures ito 3, provides an estimate of the mean of all data sets selected, and forms the target value for all applications.ISO 10068 pdf download.