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Page Title:
Atmospheric Speed Of Sound Calculator and Plotting Diagram |
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Atmospheric Speed Of Sound Calculator and Plotting Diagram The Atmospheric Speed Of Sound Calculator and Plotting Diagram is used to compute the speed of sound. To use the diagram, you will need the pressure, height, and temperature information from your worksheet. Refer to figure 6-5-3 as we go over the use of the diagram.Step 1. Take the temperature from the first line of the worksheet and locate this temperature on the temperature scale on the diagram. The temperature scale lies horizontally across the top of the diagram.Step 2. Take the wind from the first line of the worksheet (column 7) and locate the wind on the wind-speed scale. The wind-speed scale lies horizontally across the bottom of the diagram.Step 3. Using a straightedge, align the temperature, from step 1, with the wind speed, in step 2. Place a dot on the diagram at the pressure level taken from the first line of the worksheet (column 1).Step 4. Using the pressure, temperature, and wind information from line 2 of the worksheet, repeat the first 3 steps. Continue this procedure until each line of the worksheet has been plotted.Step 5. Connect the dots you have plotted on the diagram.Learning Objective: Identify sound-focus categories and sound-speed criteria.SOUND-FOCUS CATEGORIES AND SOUND-SPEED CRITERIAThe speed of sound diagram provides you with a vertical profile of the speed of sound with
Figure 6-5-2.-Sound focus wind-speed component worksheet.
Figure 6-5-3.-Atmospheric Speed of Sound Calculator and Plotting Diagram. height. The next step in computing sound focus is to compare the speed of sound at each level above the surface with the speed of sound at the surface. Remember, sound speed differences control whether sound waves will bend upward, downward, or travel in a straight line. The differences are then compared to sound focus sound-speed criteria to determine sound focus conditions. The criteria are as follows:Sound-Focus Criteria Category (Surface to 850-mb Level) NIL The speed of sound is constant or decreases with height.Sound-Focus Criteria Category (Surface to 850-mb Level) SLIGHT The speed of sound increases with height but does not exceed the speed of sound at the surface by more than 2 knots.MODERATE The speed of sound increases with height exceeding the speed of sound at the surface by 3 or 4 knots.HEAVY The speed of sound increases with height exceeding the speed of sound at the surface by 5 knots or more. |
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