Vibration test results of slab compared to ISO standards

7/18/2
008
SysEng (S) Pte Ltd
2 Kaki Bukit Place #05-00, Tritech Building
Singapore 416180. Tel: 62875710 Fax: (65) 62870893
Internet: syseng@singnet.com.sg
http://www.syseng.com.sg
Test report of Z axis vibration measurement on test slab 7 July 2008
1. Introduction
Vibration tests were carried on a test slab. Each test was carried out for a 30 minute vibration
measurement and extrapolated to 8 hours duration, assuming the same conditions were applied. The
test results were compared with the ISO2631 standard of human comfort vibration test of 8 hours,
and reduced limit of -10dB for more sensitive conditions such of residential and office environment.
The test results were carried out for these conditions:-
• Ambient measurement with no activity on the slab
• Measurement with one person walking
• Measurement with one person running
• Measurement with five persons walking
• Measurement with five persons running
2. Test condition
The accelerometer was located at the middle of the slab for measurement.
Figure 2. The dimensions of the test slab

7/18/2
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SysEng (S) Pte Ltd
3. Test results compared with ISO2631 standard for various test conditions
Vibration Test Results - Kajima
0.00010
0.00100
0.01000
0.10000
1.00000
10.00000
1 10 100
Frequency, Hz
Acceleration
(rms)
m/sec²
Ambience Noise
1 Person Walking
1 Person Running
5 Person Walking
5 Person Running
ISO2631(N)
ISO2631(R)
Figure 3.1 Test results plotted in mm/sec
2
Vibration Test Results - Kajima
0.00001
0.00010
0.00100
0.01000
0.10000
1.00000
1 10 100
Frequency, Hz
G
rms
Ambience Noise
1 Person Walking
1 Person Running
5 Person Walking
5 Person Running
ISO2631(N)
ISO2631(R)
Figure 3.2 The same results plotted in G rms
4. Conclusion
Based upon these test results and extrapolated for 8 hours, the vibration levels are below the
ISO2631 reduce comfort limits for 8 hours limit. The slab main resonant frequency is 13 Hz.
Dr Tan Guan Hong

7/18/2
008
SysEng (S) Pte Ltd
Appendix A
Figure A1 is the ISO2631 chart showing the acceleration limits in az (rms) m/s
2
. The comparisons are
based upon 8 hour chart vibration exposure and taking the upper limits at –10 dB lower for the
reduced limits. The lowest G to be measured is – 39 dB (for the 4 to 8 Hz range).
Figure A1: ISO2631 chart
Appendix B
Equipment used for the Monitoring: -
PC based Fast Fourier Transform Analyzer using Spectra Lab V4.13
Data Acquisition card used CardD Plus Dual channel 16-bit Delta-Sigma A/D converter, 64x
oversampling, 44.1 kHz, Dynamic Range of 92 dB typical
Accelerometer used Crossbow CXL01LF1Z, Z axis 1G
Leveling Jig for mechanically leveling the accelerometer with an electronic precision offset for
zeroing the DC output to ensure full scale range

7/18/2
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SysEng (S) Pte Ltd
Appendix C
Specification and conformance certificate of accelerometer
Verification is done of the accelerometer was to rotate it by 90
o
as described by the manufacturer

7/18/2
008
SysEng (S) Pte Ltd
Appendix D

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SysEng (S) Pte Ltd

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SysEng (S) Pte Ltd
Appendix E
FFT Equipment settings

7/18/2
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SysEng (S) Pte Ltd
Appendix F
During the test, seismic vibration equipment which measures +/-3G from DC to 80Hz was also used
to cross check the tests. The results are plotted for acceleration in acceleration (mm/sec²) vs. Time
(sec) and the spectrum is plotted to give the resonant frequency. All the plots shows that the resonant
frequency peaks at 13Hz.
F.1 Ambience Noise
1) Acceleration (mm/sec²) vs. Time (sec)
Time [sec]
60
55
50
45
40
35
30
25
20
15
10
5
0
Acceleration
[mm/sec2]
0.03
0.02
0.01
0
-0.01
-0.02
-0.03
-0.04
2) Fourier Amplitude vs. Frequency (Hz)
Frequency [Hz]
80
70
60
50
40
30
20
10
Fourier
Amplitude
0.08
0.075
0.07
0.065
0.06
0.055
0.05
0.045
0.04
0.035
0.03
0.025
0.02
0.015
0.01
0.005

7/18/2
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SysEng (S) Pte Ltd
F.2 One Person Walking
Time [sec]
60
55
50
45
40
35
30
25
20
15
10
5
0
Acceleration
[mm/sec2]
0.15
0.1
0.05
0
-0.05
-0.1
Frequency [Hz]
80
70
60
50
40
30
20
10
Fourier
Amplitude
0.4
0.35
0.3
0.25
0.2
0.15
0.1
0.05
0

7/18/2
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SysEng (S) Pte Ltd
F.3 One Person Running
Time [sec]
60
55
50
45
40
35
30
25
20
15
10
5
0
Ac
c
eleration
[mm/s
ec
2]
0.2
0.1
0
-0.1
-0.2
-0.3
Frequency [Hz]
80
70
60
50
40
30
20
10
Fourier
Amplitude
0.8
0.75
0.7
0.65
0.6
0.55
0.5
0.45
0.4
0.35
0.3
0.25
0.2
0.15
0.1
0.05
0

7/18/2
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SysEng (S) Pte Ltd
F.4 Five People Walking
Time [sec]
60
55
50
45
40
35
30
25
20
15
10
5
0
Acceleration
[mm/sec2]
0.2
0.1
0
-0.1
-0.2
Frequency [Hz]
80
70
60
50
40
30
20
10
Fourier
Amplitude
0.8
0.75
0.7
0.65
0.6
0.55
0.5
0.45
0.4
0.35
0.3
0.25
0.2
0.15
0.1
0.05
0

7/18/2
008
SysEng (S) Pte Ltd
F.5 Five People Running
Time [sec]
60
55
50
45
40
35
30
25
20
15
10
5
0
Acceleration
[mm/sec2]
0.8
0.6
0.4
0.2
0
-0.2
-0.4
-0.6
-0.8
Frequency [Hz]
80
70
60
50
40
30
20
10
Fourier
Amplitude
2
1.8
1.6
1.4
1.2
1
0.8
0.6
0.4
0.2
0

7/18/2
008
SysEng (S) Pte Ltd
Appendix G
Pictures taken during the tests

Vibration test results of slab compared to ISO standards

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