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Vibration Data: Van (Set 2) - Cooling Fluid Holder

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 metal support of the cooling fluid bottle.
Data Duration: 00d 00h 09m 30s
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 between two junctions of the M32, in a loop, with two roundabouts at each end. Driving from Eastgate tesco onto M32 roundabout going towards St Paul's roundabout. Stationary at traffic lights. Rapid acceleration then going on sidelines that shake the car to accelerate up to 60 mph. Traffic light at roundabout, another one just before joining the motorway. Scary acceleration. Traffic light stop at the eastgate roundabout. Start time: 10:43:45, finish time: 10:53:05.

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: CarVibII_CoolingFluidHolder.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: vertical, pointing down
Y: horizontal, pointing backward
Z: horizontal, across car, right to left

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: 570 s
Settling time: 0 s
FFT interval: 1 s
FFT length: 1 s
Number of FFTs performed: 570

Results

Highest mean vibration axis: Z

X-axis

Max Accel Ampl: 176.0 mgpeak at 119.0 Hz at 361 s

Time Peak Accel Ampl above 50% of Max Ampl: 23.0 s (4.0 %)
Peak Accel Freq Range (above 50% of Max Ampl): 19.0 ... 156.0 Hz
Mean Accel Freq (above 50% of Max Ampl): 93.5 Hz

Mean Peak Acceleration Ampl (whole test): 47.7 mgpeak
Mean Peak Acceleration Freq (whole test): 63.8 Hz

Y-axis

Max Accel Ampl: 388.4 mgpeak at 119.0 Hz at 205 s

Time Peak Accel Ampl above 50% of Max Ampl: 3.0 s (0.5 %)
Peak Accel Freq Range (above 50% of Max Ampl): 28.0 ... 36.0 Hz
Mean Accel Freq (above 50% of Max Ampl): 32.7 Hz

Mean Peak Acceleration Ampl (whole test): 62.2 mgpeak
Mean Peak Acceleration Freq (whole test): 50.6 Hz

Z-axis

Max Accel Ampl: 250.4 mgpeak at 119.0 Hz at 546 s

Time Peak Accel Ampl above 50% of Max Ampl: 30.0 s (5.3 %)
Peak Accel Freq Range (above 50% of Max Ampl): 25.0 ... 30.0 Hz
Mean Accel Freq (above 50% of Max Ampl): 28.8 Hz

Mean Peak Acceleration Ampl (whole test): 66.8 mgpeak
Mean Peak Acceleration Freq (whole test): 79.1 Hz

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