A first-of-its kind motion simulation and computer aided engineering application for iOS and Android
After many long months of completely overhauling the user interface, MOMDYN v2.0 for iOS is now live and out of beta testing! I generated this little slinky wave animation to celebrate. Download it from this link and if you enjoy, make sure to leave a review.
Quite a bit going on recently in the world of MOMDYN as we prepare version 2.0 for release on the App Store. I've been uploading a lot of short videos to Instagram showcasing the upgraded features, so make sure to follow @mobile.multibody.dynamics. Below is a gif that was posted there showing how the effect of rotational motion can be simulated by a string of linear oscillators, when phased just right. Kind of looks like a "loading" animation, eh?
As I mentioned in my last post, the last few months have been dedicated towards porting the iOS version of Mobile Multibody Dynamics to native Swift, with SwiftUI interface and SceneKit for 3D graphics. I'm happy to say that its getting close! Close enough that I have a beta test available that you can try today, and here's the link:
https://testflight.apple.com/join/xLu2Ose2
For a little eye candy, and to show off the new 3D graphics engine, here's a simple string of masses and springs. My selling point for MOMDYN has always been that its disconnected from a workstation, doesn't require internet, etc, so its there whenever you get the creative urge. This is that in action.
While pace has slowed on new Mobile Multibody Dynamics releases since MOMDYN 2.0 on Android, rest assured, the show goes on. There will be a version 2.0 for iOS, using native SwiftUI and SceneKit ... soon. in the meantime, I've done some cool stuff like this Euler angle rotation code:
Check out the brand new video on our YouTube page showing a simulation of a double pendulum using two rigid links. The kinematics are defined using two revolute joints for rotation, and rigid translations to define the centers of rotation. Double pendulums are famous for being chaotic, a small change in initial conditions lead to a large change in response. Here, we show this by gradually increasing the initial angle, where the pendulum motion starts out as fairly simple and repeated oscillation, it becomes more and more disorderly as the initial angle increases, with the second link eventually doing complete flips relative to the first link. Learn to build a model like the animation below, and video after the jump.
As I've mentioned in the last two posts, MOMDYN is getting its biggest upgrade yet, with version 2.0 for Android implementing a fully rebuilt, native interface. We will be rolling out to all new and existing users in the next week. In the meantime, check out this tutorial on Youtube to create a mass-spring-damper system, typical of vibration analysis (after the jump).
As I posted a couple months ago, I have been hard at work re-building the Android version of Mobile Multibody Dynamics. Well, I'm happy to say that the update is just about 98% done, and ready to go for beta testers! If you are an Android user, you can opt into the beta test by visiting https://play.google.com/apps/testing/com.badeyedea.momdyn. Below image is from the updated tutorial video for a simple pendulum, and you can catch a Youtube video showing how to create this model after the jump.
Long time, no post. Been quite active with the MOMDYN updates, in fact, making things more efficient, and as of today, prettier. Check out the animation below with our newest feature: color specifications for bodies.
A fairly healthy batch of updates are coming in version 1.5 of MOMDYN. The first couple of changes you can see in the gif below. First, in the 3-D diagram you now get spring graphics, as has always existed in the 2-D diagram. Second, when you flip over to the plots in the report view, there is now a legend above each of them. If you tap one of the legend entries, you can also de-active or re-activate which lines to include in the plot.
The latest MOMDYN release is on the way, will be in the stores in the next day or so. The universal joint is the newest joint in the app, which creates a frame with rotations about two axes in an Euler sequence. You can see this in the graphic above, which consists of two universal joints, a rigid translation, and two rigid body boxes. Note the large angular displacements where you can observe the relatively slow oscillation about the vertical (Y) axis, and faster oscillation about the horizontal (X) axis.
Besides the new joint, I did a whole lot of refactoring and bug fixing in this release. Added a whole lot of test coverage, so while this may not be the most feature-rich update, but I also hope it will be a lot smoother running and crash-free. I plan for this to be a trend; not too many new features going, but a lot of refinement to make the existing features work well. If there's anything you would like to see in upcoming versions, or anything that I'd royally screwed up, I would love to hear it!
Love, MOMDYN! And if you care for the sweet Christmas Music, check out the video of our Christmas tree on Youtube.
Its been a great couple of months for us, after officially releasing back in late September, we crossed the 1,000 download mark just a couple of weeks ago. We're planning a lot of cool stuff for the New Year, Just to name a few:
