GB/T 8421-2000 in English

1 Scope

This standard specifies laboratory measurement methods and limits of operator's seat vertically transmitted vibration for agricultural wheeled tractors.

This standard is applicable to the operator's seat of such agricultural wheeled tractors with the rear axle of rigid suspension.

This standard is not applicable to the operator's seat installed on the tractors for special purpose.

2 Normative References

The following standards contain provisions which, through reference in this standard, constitute provisions of this standard. At time of publication, all editions indicated were valid. All standards are subject to revision, and parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below.

GB/T 6235-1997 Agricultural Tractors - Operators Seating Accommodation - Dimensions
GB/T 10084-1988 Vibration and Shock - Methods for Analysis and Presentation of Data
GB/T 13823-1992 Methods for the Calibration of Vibration and Shock Pick-ups
GB/T 14412-1993 Mechanical Vibration and Shock - Mechanical Mounting of Accelerometers

3 Terms, Definitions and Abbreviations

For the purposes of this document, the following terms (abbreviations) and definitions apply.

3.1 frequency analysis
analysis on the measured signal in the frequency domain

3.2 analysis time duration
time history (s) of the vibration data used for analysis

Foreword I
1 Scope
2 Normative References
3 Terms, Definitions and Abbreviations
4 Vibration Rating and Limits for Tractors
5 Test Methods
6 Test Record and Test Report