IEEE Consumer Electronics Magazine - March 2018 - 30

Acceleration Power Spectrum (dB)

-75
X Direction

-80

Y Direction

-85
-90
-95
-100
-105
-110

0

5

10
15
Frequency (Hz)

20

25

(a)
Acceleration Power Spectrum (dB)

-75

0.9 1.1

-80

X Direction

Y Direction

1.81

-85
-90
-95
-100
-105
-110

0

5

10
15
Frequency (Hz)

20

25

(b)
Acceleration Power Spectrum (dB)

-75

1.05
2.1
3.16
4.1

-80
-85

X Direction

Y Direction

-90
-95
-100
-105
-110

0

5
Modes

10
15
Frequency (Hz)

20

First

Second

Third

Fourth

Measured

1.05 Hz

2.1 Hz

3.16 Hz

4.1 Hz

Natural
Frequency

1.1 Hz

3.18 Hz

3.4 Hz

4.3 Hz

25

(c)
FIGURE 5. The acceleration power-spectrum analysis. (a) The power spectrum when the tower is subject to only environmental noise, (b)
the power spectrum during the ringing of the bells on a weekday, and (c) the power intensity of the tower modes during a festival.

30 IEEE Consumer Electronics Magazine

^

march 2018



Table of Contents for the Digital Edition of IEEE Consumer Electronics Magazine - March 2018

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