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Convert Units dB to Linear Linear to dB Accel/Vel/Disp Convert
Rating Curves ASHRAE AS2670
Building Vibration Coupling Loss Building Amplification

Converts logarithmic (dB) units to linear units (mm/s) according to the equation:

v = "=" & v0*10^(dB/20)

Set to convert the row above the selected row by default.

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Converts linear units (mm/s) to logarithmic (dB) units according to the equation:

dB=20*log(v/vref)

Set to convert the row above the selected row by default.

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Conversion between displacement, velocity, and acceleration means multiplying or dividing by 2pif the correct number of times. Inserts the multiplier at each frequency band and optionally applies styles.

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TBD

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Inserts the vibration criterion curves from AS2670 Evaluation of human exposure to whole-body vibration, in either linear or dB units, along with a multiplier.

The reference curves from the standard are as follows, in one-third octave bands:

Accel/Vel (mm/s, mm/s^2)	Axis	1	1.25	1.6	2	2.5	3.15	4	5	6.3	8	10	12.5	16	20	25	31.5	40	50	63	80
Accel	z	0.010	0.009	0.008	0.007	0.006	0.006	0.005	0.005	0.005	0.005	0.006	0.008	0.010	0.013	0.016	0.020	0.025	0.031	0.039	0.050
Accel	xy	0.004	0.004	0.004	0.004	0.005	0.006	0.007	0.009	0.011	0.014	0.018	0.023	0.029	0.036	0.045	0.057	0.072	0.090	0.114	0.144
Accel	comb.	0.004	0.004	0.004	0.004	0.004	0.004	0.004	0.004	0.005	0.005	0.006	0.008	0.010	0.013	0.016	0.020	0.025	0.031	0.039	0.050
Velocity	z	0.0016	0.0011	0.0008	0.0006	0.0004	0.0003	0.0002	0.0002	0.0001	0.0001	0.0001	0.0001	0.0001	0.0001	0.0001	0.0001	0.0001	0.0001	0.0001	0.0001
Velocity	xy	0.0006	0.0005	0.0004	0.0003	0.0003	0.0003	0.0003	0.0003	0.0003	0.0003	0.0003	0.0003	0.0003	0.0003	0.0003	0.0003	0.0003	0.0003	0.0003	0.0003
Velocity	comb.	0.0006	0.0005	0.0004	0.0003	0.0002	0.0002	0.0002	0.0001	0.0001	0.0001	0.0001	0.0001	0.0001	0.0001	0.0001	0.0001	0.0001	0.0001	0.0001	0.0001

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Inserts the dB of Coupling Loss for the following building types:

• Large Masonry On Piles
• Large Masonry on Spread Footings
• 2-4 Storey Masonry on Spread Footings
• 1-2 Storey Commercial
• Single Residential

Coupling loss values have been obtained from Nelson and have been extrapolated to include frequency bands below 16Hz.

Values are taken from: Transportation Noise Reference Book, Nelson, P (1987)

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Inserts the dB of Amplification due to:

• Ground-borne Noise
• Floor Vibration

Values are taken from: ANC Guidelines - Measurement and Assessment of Ground-borne Noise & Vibration, Association of Noise Consultants (2001)

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