CALCULATION color by numbers
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What I am doing is testing rollshutters for windload using a vacuum chamber. Now, somewhere or other somebody got the above conversion to determine equivalent MPH wind speed. It is clearly empirical and seems awfully simplified to me, which raises alarm flags. Even worse, nobody knows where it came from! My questions: is this a legitimate calculation, also does anybody know its source? Are there limitations, ie the equation is accurate only for 0-10 PSF? Is there a better or more universally recognized conversion calc?
With that premise, the equation you are using is close to the basic equation used to convert wind speed to wind pressure as given in many texts and in ASCE 7, “Minimum Design Loads for Buildings and Structures”. 00256 corresponds to the mass density of air at standard atmospheric pressure and temperature, with the appropriate unit conversions applied. 00249 you are using is the mass density of air at something other than standard atmosphere. Usually there are numerous factors applied to components such as this for wind loads. These include shape factors, height factors, terrain type,structural importance and others. Consider these when you are doing your tests, as these usually make the pressures increase. Check ASCE 7-88, 7-93, 7-95, and 7-98 for treatment of these factors.
The vacuum figure is the pressure differential withstood by the rollshutter curtain. Is it fair to say, it’s a basic equation for civil engineering? STP density of air would be 0. Now if I check my air table “Properties of Air at Standard Atmospheric Pressure”, the air would have to be nearly 600 degF to have density of 0.
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Or is there one of those “fudge factors” so common to empirical equations. 00249 constant in my equation would be the constant applicable at an air temperature of -7. Your equation for the constant should be. I believe you have an extra squared term in your equation.
00256, is standard at 59F and 29. The wind speed to pressure formula is common to structural engineering. This portion of the equivalence is indisputable. However, there is no simple conversion factor to MHP using ASCE 7 or any other code-type source because of the great quantity of parametric variables that go into determining dynamic wind force acting on an object some of which are noted by Ron in his first response. IBC, UBC, EIA, BOCA, ASCE 7, etc. If these codes were correct, then practically all structures built before 1982 would have experienced lateral wind forces that would have brought about their demise long before now.
I have reviewed many tall, slender structures that were designed and built in the time frame from 1935 to 1982. The design methodologies and force coefficients contained in current design standards are generally based on research performed i n the late 1950’s and early 1960’s. This body of research is presented in ASCE Transactions Paper No. 3269 ‘Wind Forces on Structures’ which includes significant numbers of references to empirical drag force coefficients. 55 in the Transaction Report, but current design standards require the use of a drag coeffiecient of 0. 7 or more depending on the standard or code used as a reference.
This is even worse for essentially square or flat objects. 25, the 1961 paper indicates a drag force coefficient of 1. 4, but current design standards require a drag coefficient of 1. This alone makes it very difficult or impossible to back into a wind velocity based upon a certain negative pressure in PSF. I suggest that if you want an answer to your question, you look into design materials used by mechanical and areonautical engineers for derivation of drag coefficients.
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I believe they use more realistic design standards and codes with respect to drag coefficients because of the nature of their work. Best of Luck to you in your quest. I’d be happy to give you more information on how to obtain a copy of the ASCE Transaction Paper No. C-sub-D, to get the force on an object with a known drag coefficient, some Y feet in the air.
C-sub-D values by the time I’ve calculated a pressure, and I’d need to normalize against those. Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework. The Eng-Tips staff will check this out and take appropriate action.
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Learn how to mentally calculate cube roots and amaze your friends! Ask the spectator to choose any whole number less than 100 and, using a calculator, to find its cube by multiplying the number by itself, then multiplying the answer by the original number. Note that this method will not work with cubes of numbers greater than 99. Step 1: Learn the Cubes of 0 to 9To master the system you must learn by heart the cubes of numbers 0 to 9, which are shown in the table below. You also need to consider the last digit of each cube.
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Note how the last digit of the cubes for 0, 1, 4, 5, 6, and 9 end with the original number. Note how the last digits for the cubes of 2 and 8 are swapped. Note how the last digits for the cubes of 3 and 7 are swapped. The cube root of this is the first digit of your answer.
Now consider the last digit of the number called out by the spectator. This will indicate the last digit of your answer. Step 3: Practice, Practice, Practice ! Before you try this out on your friends, you should practice until you can calculate the cube root instantly and without error. If you can’t do this, then practice some more!
To practice and assess your ability, you can use the test below. Performance linear interior LED cove and accent fixture with solid white light. Some items in this family are eligible for our North American Quick Ship program. W Cove QLX Powercore represents the latest in high-quality linear LED cove lighting from Philips Color Kinetics. This elegant, low-profile luminaire delivers up to 432 lumens per foot of white light at an affordable price. W Cove QLX Powercore is designed to replace traditional cove lighting sources for wall and ceiling glow effects, wall washing, and indirect lighting from a single cove. Multiple options for design flexibility — Available in four color temperatures ranging from a warm 2700 K to a cool 4000 K.
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And of course, there’s a workbook with instructions! I can’t claim to have originated any of these calculations, thanks to Ross Bunker, James Baker, Joe Mako, Andy Cotgreave, Richard Leeke, and others I’m sure I’m forgetting for their work! If you have any other really common uses for table calculations, leave a comment! Pingback: Want to Learn Table Calculations?
I find a green order date pill on the filters shelf and the worksheet doesn’t do anything at all when switching the parameter from OFF to ON. It seems your intention was to publish the workbook without that green order date pill in the filters area? Love the technique for sorting a dimension from the primary data source by a discrete measure from the secondary data source when blending! I’m confused by what’s happening here. Category is being compared via the radio button quick filter. Perhaps I’m missing the point of what the view is meant to do and I’m expecting the wrong behavior?
If you open up the prior worksheet 7. Did I answer my own question correctly ? Small Typo: this one uses 1. Again, thanks, this is great material! You’re welcome, and I appreciate the feedback! The problem was that I’d only wanted the view to have two years in it, so I’d set up the continuous Order Date pill as a range filter with a relative filter for the last two years.
That worked fine in the data set during calendar 2013, so the filter pulled 2012 and 2013, however once the calendar flipped to 2014 then it failed because there wasn’t any 2014 data. 2773 if you’d like to see that need go away in a future release. Sorry I wasn’t more clear in the description. The blue line is the sales for the selected Category. Category _within the Department_ that Category belongs to. One way to see this is by putting Department on the Rows Shelf, then dragging the table calc filter onto the Rows Shelf just to the right of the Department pill.
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Categories for a given Department are the same. Thanks for the catch, I’ve corrected it. Actually, that wasn’t a typo, I can see how you’d think that since the worksheet number and the value were 14 and 1. The invisible reference line calc 14. Thanks again for your feedback and questions, please keep them coming! About Jonathan I’m a father of an eight year-old who loves math and gymnastics. Sorry, your blog cannot share posts by email.
RGB-Hex-Decimal-CMYK Color Conversion ToolRGB – stands for Red Green and Blue. Online color converter tool for RGB to the CMYK color conversion. Simply enter the hexadecimal value of the RGB color code and the tool will give you the respective CMYK color codes. RGB color system is also called as additive color system. This RGB-Hex-Decimal-CMYK Color Conversion tool also helps you to find the RGB decimal color code for the given RGB hexadecimal value. RGB – stands for Red Green and Blue. The colors formed from the mix of red, green and blue is in the range of 0 to 255 in decimal and 0 to FF in hexadecimal.
Your first data will appear automatically in just a few seconds. Please note that the density of an object that is made of different materials, can be determined by measuring the total mass and the total volume of the object. You can use our density converter to carry out the conversion of density units. Want more photos than available on Pexels? Browse millions of additional fully licensed images on Storyblocks.
That is you could use this calculator to know the corresponding pantone colour for a given hexadecimal colour. You could also enter the colour distance value to get accurate results. Here is a simple online tool to convert the color values from Hexadecimal to the Pantone colours. The color distance is defined as the difference or distance between two colors and is measure as the metric of interest in color science. Click here to see the original in its original context. Finally, which equation should be chosen and how should it be used? You don’t have to spend too long in the color management world before you come across the term Delta-E.
As with many things color, it seems simple to understand at first, yet the closer you look, the more elusive it gets. The idea is that a dE of 1. 0 is the smallest color difference the human eye can see. So any dE less than 1. Unfortunately – and probably not surprisingly – it’s not that simple. Some color differences greater than 1 are perfectly acceptable, maybe even unnoticeable. It’s perfectly understandable that we would want to have a system to show errors.