Hi, my name is Fernando Zigunov, welcome to my home page! Here I share some random ideas and projects I made. I love building complex engineering systems, which I happen to do both professionally and as a hobby. Hope you find some of them interesting!


Transform Your Camera Tripod Into an EPIC Timelapse Panorama Slider!

Have you ever wanted to make a nice timelapse where you have some camera motion? If you look in the market, there’s some (rather expensive) motorized sliders that you can buy. These usually go for $300-$600, but they don’t have much travel. For example, this model has a 31.5″ (0.8m) travel and costs $258. This one is $369 and … Continue reading Transform Your Camera Tripod Into an EPIC Timelapse Panorama Slider!

Using randomized snapshot POD to overcome SVD memory issues

Introduction For those acquainted with POD (Proper Orthogonal Decomposition), it’s very easy to throw POD at everything data analysis related. It’s such a powerful technique! For those who aren’t acquainted, I really recommend. I’ll introduce with a refresher. If you’re good, follow to the next section! We can decompose a set of N dimensional data … Continue reading Using randomized snapshot POD to overcome SVD memory issues

Thermal Stacks, Transmission Lines, high power LED’s and Temperature Sensitive Paints (TSP)

I’m writing this because even though it’s already 2020, this kind of stuff still cannot be found anywhere in the internet! Stacking layers of materials is something we all do in so many engineering applications! Electronic components, batteries, constructions panels, ovens, refrigerators and so many other layered materials that are inevitably under heat transfer. We … Continue reading Thermal Stacks, Transmission Lines, high power LED’s and Temperature Sensitive Paints (TSP)

Sound Visualization: Nonlinearities – Part III

As discussed in Parts I and II, we established that we can use a Schlieren or a shadowgraph apparatus to visualize sound waves. The shadowgraph is not as interesting an instrument, due to its stronger high-pass behavior. Nevertheless, both instruments are viable as long as one makes it sensitive enough to see the waves. When … Continue reading Sound Visualization: Nonlinearities – Part III

Schlieren vs Shadowgraph for Sound Visualization – Part II

This continues our saga we started at Part I (spoiler alert: you’re probably better off with a Schlieren). Thanks to a good discussion with my graduate school friend Serdar Seckin, I got curious about applying the same sensitivity criterion to a shadowgraph system. Turns out, Settles’ book also has the equations for contrast in the … Continue reading Schlieren vs Shadowgraph for Sound Visualization – Part II

The anti-gravity piddler: A demonstration of aliasing

So you’ve probably already seen demos on Youtube showing this really weird “camera effect” where they stick a hose to a subwoofer and get the water to look like it’s being sucked back to the hose, seemingly against gravity. I personally love this effect. In the case of the subwoofer, the effect is due to … Continue reading The anti-gravity piddler: A demonstration of aliasing

Cutting mathematical sheets

Mathematics in the complex plane are sometimes surprisingly difficult to understand! Well, the complex numbers definitely earned their name! Maybe you’re also studying complex analysis, or have studied it in the past and didn’t quite understand it. The fact is, it requires a lot of imagination to see the concepts. I sometimes like to compensate … Continue reading Cutting mathematical sheets

Scheimpflug – Tilt-swing adjustment in practice

As a disclaimer, I’m applying this technique in a scientific setting, but I’m sure the same exact problem arises when doing general macro photography. So, first, what is a Scheimpff…. plug? Scheimpflug is actually the last name of Theodor Scheimpflug, who apparently described (not for the first time) a method for perspective correction in aerial … Continue reading Scheimpflug – Tilt-swing adjustment in practice

Jet actuator arrays, turning microjets into MIDIjets

So I’m currently working on this research problem: Microjets in cross flow for disturbance-based flow control. Jets in crossflow have some promise to be a viable flow control technique in aerodynamic applications, but it’s still in its early-mid research stages, where the technology has good theoretical support (i.e. it should work) and some experimental successes … Continue reading Jet actuator arrays, turning microjets into MIDIjets

Finding Vortex Cores from PIV fields with Gamma 1

Vortex core tracking is a rather niche task in fluid mechanics that is somewhat daunting for the uninitiated in data analysis. The Matlab implementation by Sebastian Endrikat (thanks!), which can be found here, inspired me to dive a little deeper. His implementation is based on the paper “Combining PIV, POD and vortex identification algorithms for … Continue reading Finding Vortex Cores from PIV fields with Gamma 1

Resonant Coupling Efficiency for Wireless Power Transfer

So I’ve been working on a hobby project that involves transferring power to a circuit wirelessly. The distance is quite short (<10mm), as I just need to have one part of the device spinning and the other stationary. I decided to stick with LC resonant coupling circuits as a solution to transfer this power, as I … Continue reading Resonant Coupling Efficiency for Wireless Power Transfer

A freezing tunnel (VRT) thermal model

As many refrigeration engineers around the world, I’ve always been curious to understand better how this machinery behaves transiently. For the ones who do not know the Variable Retention Tunnel, take a brief stop at Google before reading on, so you can appreciate better what I’m talking about! In practice, we see that when the production rate … Continue reading A freezing tunnel (VRT) thermal model