SAE J1490_201105

1 Scope
    1.1 Purpose
2 References
3 Definitions
    3.1 Vibration Measurement Axis Reference
    3.2 Terminology
          3.2.1 Overlap Processing
          3.2.2 PSD
          3.2.3 Ride Vibrations
          3.2.4 RMS
          3.2.5 Seat Pad
          3.2.6 Signal-to-Noise Ratio
          3.2.7 Spectrum
          3.2.8 Test Section
          3.2.9 Transverse Sensitivity
          3.2.10 Windowing
    3.3 Letter Symbols
4 General Test Design
5 Test Preparation and Documentation
    5.1 Vehicle
    5.2 Test Site
    5.3 Operator
    5.4 Operating Conditions
6 Subjective Ride Evaluations
7 Instrumented Ride Vibration Measurements
    7.1 Measurement Instrumentation
          7.1.1 Accelerometers and Signal Conditioning
          7.1.2 Acceleration Data Recording
          7.1.3 Instrumentation Data Sheet
    7.2 Accelerometer Location
    7.3 Data Analysis
          7.3.1 Stationary of Data
          7.3.2 Acceleration Measures
                  7.3.2.1 g(rms)
                  7.3.2.2 Weighted g(rms)
                  7.3.2.3 1/3 Octave Peak g(rms)
                  7.3.2.4 ISO 1/3 Octave Peak
                  7.3.2.5 Exceedance
                  7.3.2.6 Absorbed Power
          7.3.3 Data Analysis Parameters
                  7.3.3.1 Data Duration
                  7.3.3.2 Prepossessing Filters
                  7.3.3.3 Sampling Frequency
                  7.3.3.4 Sampling Accuracy
                  7.3.3.5 Sampling Window
                  7.3.3.6 Frequency Resolution
                  7.3.3.7 Overlap Percentage
                  7.3.3.8 Precision of Spectral Estimates
8 Data Presentation
    8.1 Graphic Presentation
          8.1.1 Power Spectral Density
          8.1.2 Square Root of Power Spectral Density
          8.1.3 Time Domain Histogram
    8.2 Ride Measures Presentation

Gives a uniform procedure for measuring ride vibrations for all Class 7 and 8 commercial vehicles, including combination vehicles and straight trucks.

There are two ways to assess the characteristics of ride vibrations of a vehicle during its operation. Subjective evaluation and objective measurement. Subjective assessments of the ride vibrations experienced by drivers during ride evaluations are generally performed by a panel of drivers and/or passengers who are instructed to operate or ride a group of vehicles in a predetermined manner in order to subjectively assess the levels and characteristics of ride vibrations. Figures 6A through 6C show examples of subjective evaluation forms presently in use. The disadvantages of the subjective method include need for careful experimental design, need for statistically unbiased samples, complexity of human perceptions of vibrations, and difficulty in comparing qualitative data of vehicles evaluated at different times and/or by different groups of people. Often ride characterization is not an easy task using only qualitative or descriptive terms. Therefore, it is necessary and desirable to develop objective techniques to enable ride engineers and others to measure ride vibrations during ride assessment in a quantitative manner.This recommendation details a uniform method for the measurement of ride vibrations of all Class 7 and 8 commercial vehicles, including both combination vehicles and straight trucks. Vibrations are to be measured utilizing cab and seat-pad mounted accelerometers in vertical (z axis) and fore/aft (x axis) directions. The measurement in lateral direction (y axis) is optional as these vibrations from a ride assessment standpoint are seldom significant in commercial vehicles. Several currently utilized methods of displaying, analyzing, and combining the measured accelerations are presented.This recommendation does not make any statements concerning how well any of the objective ride measures will correlate to subjective evaluations of ride, nor does it deal with any limits or establish any desirable values for acceptable ride.It is recognized that objective ride evaluation methods have some disadvantages due to the complexities of these measures, sophistication of instrumentation and analysis techniques, etc. Therefore, it is recommended that technically trained personnel conduct the objective tests and analyze the data.