#Vortex Indicator Calculation and Interpretation | Explore Tumblr Posts and Blogs

simulit-blog · 6 years

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Week 5-Bon Jovi Lyrics Here

Week 5, the halfway point! Only one wind tunnel test this week, the rest was spent in the conference room starting to put together a presentation, and painstakingly stepping through a video frame-by-frame trying to calculate the frequency of vortex shedding on our wing after the flow detaches (preliminary estimates place this number at 40 Hz).

After the Great Wing Bending of April 2018, we decided to fix the wing flexibility problem by performing the ever-elegant solution of shoving a carbon rod in the wing. We figured that placing the carbon rod at about the quarter chord of the wing would allow it to counteract most of the bending the wing experienced. We drilled a hole out of the wing, then tried to stuff the carbon rod in further. All told, we probably managed to get the carbon rod in to a depth of about 4 inches. That should be good enough, right?

That’s still not ideal, and even though the reinforced wing did actually bend less than the original wing, Dr. Doig still likened it to a banana. Such a strong curve definitely affected the angle that we were able to observe stall (it’s safe to say that most airfoils, let alone the 4412, stall well before 22°).

The reason that the wing, reinforced or not, stalled at such a late angle of attack is due to changes in the local angle of attack of the wing. At first I thought the bending would cause such changes, but thinking it over further, I realized that this wouldn’t change the local angle of attack that much. I realized that if anything, the wing must be twisting in a sort of weathervane effect, causing it to have a much lower angle of attack than what is indicated on the winch. This effect must have been stronger on the unreinforced wing, considering we never actually observed stall on that wing.

This twist comes from two likely places: one being that the wing we made didn’t fit in the turntable perfectly, and two that the wing was made of EPP foam, which is a lot less stiff than typical wing materials.

The final thing that we did was attempt to calculate the Strouhal number for the wing once the flow had separated. This necessitated finding the frequency of vortex shedding off the wings. We didn’t actually know how fast the slow-mo was on a Galaxy S8, so some trickery was required: by filming a timer in slow motion, we were able to find out how many seconds passed with each frame, which allowed an fps calculation. (The Galaxy S8 takes slow mo video at 240 frames per second). Then came the meticulous flipping frame by frame through the video to find the exact moment the vortex gets shed off the wing. We found that a similar image showed up every six or so frames, meaning that the vortices were being shed at a pace of about 40 Hz. What does this mean? A little more interpretation is needed on that question.

Today’s fact of the week: did you know a pangram, or a holoalphabetic sentence, is a sentence that uses every letter in the English alphabet? They’re often used to display typefaces, as you can see we did on our slides below:

My favorite pangram is “sphinx of black quartz, judge my vow”, which I think we can all agree is objectively the far cooler way to display an alphabet. There are far more examples, but I think perhaps the most applicable to aerospace engineers is: “ Pack my box with five dozen liquor jugs.”

Source for this adorable image

#aero307 #stifferwing #slowmo #pangram #strouhal

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karenlopez19857 · 5 years

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Advanced Technical Indicators And Also Devices For The Modern Day Trader

Technical Analysis makes use of historical costs to recognize patterns and also assistance as well as resistance levels. Technical indications are derived from mathematical algorithms that make use of historic information to provide an existing worth. Many are for that reason necessarily lagging.

Some of the popular delayed indicators include moving standards and MACD. If you are a short term trader, these sorts of indications will probably be ineffective to you as their signals have a tendency to be extremely late. By the time a moving average crossover occurs for instance, a considerable part of the rate move has actually currently occurred.

On the other hand we have actually the so called “leading” signs. Leading indications as suggested in the name are designed to lead cost movements. A lot of the popular ones that we know of at the moment represent some type of rate momentum over a repaired look-back duration. This is the number of periods used to calculate the sign. For instance, a 20-day Stochastic Oscillator would certainly make use of the past 20 days of rate activity in its calculation and all prior rate action must be neglected.

A few of the even more prominent leading indications consist of Asset Channel Index (CCI), Energy, Family Member Stamina Index (RSI), Stochastic Oscillator and also Williams %R.

Among the most significant problems short-term day investors encounter when making use of these “basic” leading signs is that their anticipating power in non-trending market problems is mainly negated. As an example, when considering the Relative Toughness Index (RSI) would certainly it be risk-free to get when the sign is oversold or market when it is overbought? Or would certainly a Momentum indicator tell us where price is going next? Probably it wouldn’t.

The anticipating power of these conventional leading indicators is also more negated because of the relentless outside news occasions that trigger radical cost steps in connection to the most recent moves. Many of these indications were established for usage in stock market trading decades back.

If you’re a day trader, you could be asking what technical indications should I be using then?

Wave 59 is constructed exclusively by traders, for investors. It includes many special trading tools as well as advanced technological indications developed for the modern-day day investor prepared to look at markets in a somewhat various means.

A few of the a lot more interesting tools and also progressed technological indicators on offer to day investors are:

Geometric Patterns-- Geometric patterns are intended to manipulate the partnership in between the price as well as time axis. Unless you have actually been working with Gann strategies, opportunities are you do not recognize the capacity of geometric patterns.

The Fibonacci Vortex-- an extremely distinct assistance and resistance tool. It is the geometric pattern behind most of rate swings found in all traded markets. You merely place it on your chart, line it up against current price activity and watch as the market jumps off predetermined turning factors in both time and also price.

Time as well as Price Patterns - Typically, with comparable sorts of trading software that attempt to recognize repeating patterns in a graph, the individual has no influence on the type of patterns the applications acknowledge as they are usually pre set. By comparison, Wave59 offers you with a basic to utilize pattern builder enabling the development as well as interpretation of tailored patterns which can be put in the chart or the program can search for a comparable pattern in rates.

The Wave59 software application likewise consists of lots of enhanced versions of prominent trading techniques.

For example, their “Fractal Pattern Index” appears like the habits of the better understood ADX indicator. The “Ultra Smooth Energy” curve is like most of the extra commonly used energy contours yet without the sound. These 2 devices are examples of improved algorithms and ought to theoretically exceed the preferred versions of these standard signs as they are calculated making use of a boosted mathematical formula.

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researchetcsblog · 3 years

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How Does a Karman Vortices Sensor Work?

The karman vortex sensor is a newly developed measuring device that is the centerpiece of a new era of high performance and precision testing. It has been designed by NASA researchers, and is the first karman vortex sensor to be used in the atmosphere on aircraft. This breakthrough for NASA will usher in a new era in measuring airflows, aiding engineers and pilots in the design of the next generation of aircraft. And as this karman vortex sensor and its many applications are used in new projects and space exploration, the tool will play an integral part in our understanding of aerodynamics and the design of spacecraft components.

The instrument was designed for two main applications; those of aircraft and land vehicles. The primary use for the layman air flow sensors is the measurement of boundary area, particularly low level airflows. As a secondary application, karman vortex sensor data can also be used for hydrodynamic purposes, mass flow analysis, dynamic stability calculations and in engineering computer modeling.

Karman has been designing and building air flow measuring instruments for over 75 years, and their first thrust into the aircraft applications came with the Karmanograph, or Karman probe, which probed the boundary areas surrounding the wing of an airplane or missile. With the advent of better measuring techniques, the Karmanpert probe was replaced by mass air flow sensors, which could measure an airplane's airflow at greater depths than the karman probe could. These new sensors provided a much higher resolution image of the airplane's airflow and enabled engineers to more precisely control the overall shape of the aircraft. With improved accuracy and greater maneuverability, heavier and wider wings were developed. While this eventually led to the development of wings which are generally referred to as swept wings, the development of these sensors provided engineers with a valuable source of data for controlling the shape of the wing.

Another application of karman vortex sensor data is in the intake air temperature (IAT) measurement process. Air temperatures inside the intake ducts can change significantly with airflow conditions and can cause inaccurate IAT values. Because of this, the karman vortex sensor is used in conjunction with an air filter to filter out unwanted components from the airflow measurements, and an external mass airflow device to remove turbulent air from the measurements. These two solutions provide a higher accuracy in the IAT value and therefore are often combined.

Although the karman vortex sensor research uses a wire form to collect the data, the process is not one that requires high precision and engineering skill. A regular pencil or paper streamline configuration can suffice to obtain the desired results. In fact, because of the low mass airflow produced by most vortex tube models, accurate IAT measurements can be achieved in less than a minute using the same methodology. This method allows for continuous data collection over long periods of time, which can then be analyzed later.

There are several different types of mass flow sensor available on the market, including conductive, opto-mechanical, and optoelectronic membranes. Each of these forms has its own advantages and drawbacks, and for many applications the karman vortex sensor is the best choice due to its ease of use, low-mass airflow, and long lifetime. Karman vortex sensors can be purchased online and through catalogs and shops in most retail outlets. They are also available directly from a manufacturer through a karman vortex switch outlet.

The global Karman Vortex Air Flow Sensor market is expected to reach US$ XX Million by 2027, with a CAGR of XX% from 2020 to 2027, based on HNY Research newly published report.

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Global Karman Vortex Air Flow Sensor Industry Research Report 2021 Segmented by Major Market Players, Types, Applications and Countries Forecast to 2027 Market report offers great insights of the market and consumer data and their interpretation through various figures and graphs. Report has embedded global market and regional market deep analysis through various research methodologies. The report also offers great competitor analysis of the industries and highlights the key aspect of their business like success stories, market development and growth rate.

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