Summary of Small Wind Turbine Noise Measurements in dBA

Summary of Small Wind Turbine Noise Measurements at Wulf Test Field in dBA
	Hub	Reference	Slant			Sound		Projected		Projected
Turbine	Height	Position	Distance	SPL		Power		100		to 45 dBA
Tested	H	Ro	Ri	@ 8 m/s	@ 10 m/s	@ 8 m/s	@ 10 m/s	@ 8 m/s	@ 10 m/s	@ 8 m/s	@ 10 m/s
	m	m	m	LAeq, ref	LAeq, ref	LWA, ref	LWA, ref	LAeq	LAeq	m	m
Ampair 100
Charging	13.4	13.9	19.3	44	51	na	na	na	na	na	na
Unloaded	13.4	13.9	19.3	49	56	80	86	32	38	50	75
Air 403	13.4	14.0	19.4	57	60	88	91	39	43	50	75
BWC 850
Charging	19.2	20.4	28.0	48	53	82	87	34	39	22	45
Unloaded	19.2	20.4	28.0	58	64	92	97	44	49	80	150
Ln= ambient, turbine parked.
Ls+n= ambient plus wind turbine operating.
Ls= wind turbine noise alone at reference postion Ro
Ls= LAeq, ref, corrected level
Atmospheric absorption=0.005 dB/m