How Long to Read Reduction of Tonal Propeller Noise by Means of Uneven Blade Spacing

How Long Does it Take to Read Reduction of Tonal Propeller Noise by Means of Uneven Blade Spacing?

It takes the average reader 1 hour and 21 minutes to read Reduction of Tonal Propeller Noise by Means of Uneven Blade Spacing by Tae Young Kim

Assuming a reading speed of 250 words per minute. Learn more

Description

An experimental study was conducted on the noise characteristics of four-bladed general aviation propellers with uneven blade spacing. The subscale propeller designs were inspired by the fourbladed McCauley propellers used on the Beechcraft King Air 350 series aircraft. The 4-inch diameter (1:22.5 scale) propellers were manufactured using high-resolution stereolithography and were powered by a high performance, radio controlled brushless electric motor. Acoustic measurements were taken with a 24-microphone array. The use of uneven blade spacing created additional tones over which the acoustic intensity was distributed. Large amounts of acoustic intensity were shifted into the lowest frequency tone (occuring at half of the blade passage frequency of the propeller with evenly spaced blades), resulting in reductions of A-weighted overall sound pressure levels of up to 5 dB for polar angles near 90°. These reduction are partly offset by increases in A-weighted overall sound pressure levels of up to 4 dB at polar angles less than 50°. Although the theory used to predict propeller noise does not show good agreement with experiments, it does show this trend of increasing noise at low polar angles. Since noise at low polar angles are weighted less in noise metrics such as flyover noise, the use of uneven blade spacing has potential for providing noise reduction without adding excessive complexity to propeller design.

How long is Reduction of Tonal Propeller Noise by Means of Uneven Blade Spacing?

Reduction of Tonal Propeller Noise by Means of Uneven Blade Spacing by Tae Young Kim is 79 pages long, and a total of 20,461 words.

This makes it 27% the length of the average book. It also has 25% more words than the average book.

How Long Does it Take to Read Reduction of Tonal Propeller Noise by Means of Uneven Blade Spacing Aloud?

The average oral reading speed is 183 words per minute. This means it takes 1 hour and 51 minutes to read Reduction of Tonal Propeller Noise by Means of Uneven Blade Spacing aloud.

What Reading Level is Reduction of Tonal Propeller Noise by Means of Uneven Blade Spacing?

Reduction of Tonal Propeller Noise by Means of Uneven Blade Spacing is suitable for students ages 10 and up.

Note that there may be other factors that effect this rating besides length that are not factored in on this page. This may include things like complex language or sensitive topics not suitable for students of certain ages.

When deciding what to show young students always use your best judgement and consult a professional.

Where Can I Buy Reduction of Tonal Propeller Noise by Means of Uneven Blade Spacing?

Reduction of Tonal Propeller Noise by Means of Uneven Blade Spacing by Tae Young Kim is sold by several retailers and bookshops. However, Read Time works with Amazon to provide an easier way to purchase books.

To buy Reduction of Tonal Propeller Noise by Means of Uneven Blade Spacing by Tae Young Kim on Amazon click the button below.