Building Design and Construction Handbook - Merritt - Ventech!

5.186 SECTION FIVE
developed which related the three variables of the vibration episode to the subjective
perception ratings. This equation is presented below.
Wiss and Parmelee rating factor:
0.265
FA
R � 5.08� 0.217 D �
where R � response rating; 1 � imperceptible; 2 � barely perceptible; 3 � distinctly
perceptible; 4 � strongly perceptible; 5 � severe.
F � frequency of the vibration episode, Hz
A � maximum displacement amplitude, in
D � damping ratio, expressed as a ratio of critical
A graph of this subjective rating system is shown in Fig. 5.115. It should be
noted that the lines represent a mean for that particular rating. The authors suggest
that the boundaries for each rating lie halfway between the mean lines. The boundaries
defining R � 1 and R � 5 are not identified by the authors. These ratings are
unbounded; therefore, a mean line cannot be computed.
5.22 REIHER-MEISTER SCALE FOR STEADY-
STATE VIBRATIONS
The scale discussed below and those in Art. 5.21 and 5.23 useful in assessing human
perception to vibration levels. They are presented to provide insight with respect
FIGURE 5.115 Wiss and Parmelee rating factor scale. 17