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Vibration Data: Van - Front Wheel Hub

General Information

Contact: Gyorgy Szarka [additional processing by Dr Alex Weddell]
Institution: University of Bristol
Parameter: Vibration, 3-axis
Specific Location: Data Logger is cable-tied to the wheel (diameter 0.7 m) in an angle of approximately 35 degrees.
Data Duration: 00d 00h 04m 59s
Sampling Frequency: 2048 Hz

Description: The selected car is a commercial vehicle (VW Transporter van) with a 5-cylinder diesel engine. The engine speed is relatively low, varying between 1500-2500 rpm. The van was driven around a set of roundabouts and straights for approx. 5 minutes, the maximum speed on the straight road was 40 mph.

The data streams are included in .mat file, titled with the location of each data segments. There are 7 columns of data that represent: time (in seconds), x-axis raw data (in mV), y-axis raw data (in mV), z-axis raw data (in mV), x-axis acceleration (in g), y-axis acceleration (in g), and z-axis acceleration (in g).

Features:

a) The sensor is saturated at speeds higher than ~25 mph so the data for those parts cannot be used
b) Starting from stand-still 27 - 33 seconds
c) Going around a roundabout 86.3 - 97.3 seconds
d) Stopping: 298 - 306 seconds

Acknowledgment: This work was supported by the Engineering and Physical Sciences Research Council (EPSRC) under grant number EP/G067740/1 "Next Generation Energy-Harvesting Electronics: Holistic Approach"

Picture of test


Detailed Test Information

Original Filename: CarVib_WheelHub.mat

Test Equipment:

Custom data logger based on ADXL325 MEMS 3-axis accelerometer

Calibration Parameters:

X: 210 mV/g, zero-g reading 1812 mV
Y: 210 mV/g, zero-g reading 1797 mV
Z: 210 mV/g, zero-g reading 1810 mV

Axis Directions:

X: tangential, clockwise
Y: radial, pointing outwards
Z: tangential, pointing away from the car

Downloads/Links

Data MAT file (zipped)

Graphical Test Results

Peak Acceleration Frequency and Amplitude

Peak Acceleration Frequency and Amplitude

FFT at Maximum Vibration Amplitude

FFT at Max Vibration Amplitude

X-axis Vibration Characteristics

X-axis Vibration Characteristics

Y-axis Vibration Characteristics

Y-axis Vibration Characteristics

Z-axis Vibration Characteristics

Z-axis Vibration Characteristics

Automated Analysis

Processing Parameters

Sample rate: 2048 Hz
Duration: 299 s
Settling time: 10 s
FFT interval: 1 s
FFT length: 1 s
Number of FFTs performed: 289

Results

Highest mean vibration axis: X

X-axis

Max Accel Ampl: 999.3 mgpeak at 44.0 Hz at 230 s

Time Peak Accel Ampl above 50% of Max Ampl: 7.0 s (2.4 %)
Peak Accel Freq Range (above 50% of Max Ampl): 41.0 ... 49.0 Hz
Mean Accel Freq (above 50% of Max Ampl): 44.4 Hz

Mean Peak Acceleration Ampl (whole test): 109.1 mgpeak
Mean Peak Acceleration Freq (whole test): 149.5 Hz

Y-axis

Max Accel Ampl: 313.3 mgpeak at 44.0 Hz at 10 s

Time Peak Accel Ampl above 50% of Max Ampl: 3.0 s (1.0 %)
Peak Accel Freq Range (above 50% of Max Ampl): 29.0 ... 29.0 Hz
Mean Accel Freq (above 50% of Max Ampl): 29.0 Hz

Mean Peak Acceleration Ampl (whole test): 19.4 mgpeak
Mean Peak Acceleration Freq (whole test): 212.8 Hz

Z-axis

Max Accel Ampl: 305.7 mgpeak at 44.0 Hz at 197 s

Time Peak Accel Ampl above 50% of Max Ampl: 60.0 s (20.8 %)
Peak Accel Freq Range (above 50% of Max Ampl): 19.0 ... 220.0 Hz
Mean Accel Freq (above 50% of Max Ampl): 67.8 Hz

Mean Peak Acceleration Ampl (whole test): 84.2 mgpeak
Mean Peak Acceleration Freq (whole test): 86.1 Hz

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