Final Year Mechanical Project GoPro Cam Stabilizer

Treat it as a mechanical low-pass filter.

I am unfamiliar with the concept could you please elaborate. A quick google suggests some sort of signal processing unit that filters certain mechanical signals

I assume it's reference to a rhetorical device?

Your car is riding on four of them.

The 'signal' in this case is vertical displacement vs time. Lets say you're riding your bike over hills and valleys; meanwhile the road's surface is peppered with potholes. Riding your bike over the potholes produces a high-frequency vertical displacement which your device must 'filter out.' The hills and valleys you're riding over represent the low-frequency component that your device must pass-through; you want it to gain and lose altitude along with the bike, yes? Between these two extremes your device has a cut-off frequency below which it will pass the 'signal' and above which it will reject it. Hence, 'low-pass' filter. Analytically it has the same transfer function as an electrical low-pass filter; again, the 'signal' in this case being vertical displacement vs time as opposed to a voltage vs time in the electrical case, but the mathematics are the same. You're in your final year at uni, did you study the mathematical treatment of such systems? A simple spring-mass-dashpot system represents a first-order low pass mechanical filter, for example, the mass in this case being the camera and its mount. Your car's suspension is another example of such a filter.

My apologies if it seemed that way, let me elaborate on what I've done so far.

Up to date I've conducted a literature study investigating the type of forces and frequency vibrations that on can typically experience on different locations on a mountain bike whilst riding. Im leaning more a to handlebar design as the weight requirements (as provided by the user is less restrictive).

I've also looked into existing designs whilst there are very few mechanical only design. One thought was developing some sort of gimbal on a small scale as Ive seen a few DIY camera gimbals on youtube. Another stabilizer which I came across was from http://www.stabylizr.com/ , its purely mechanical and maybe I could develop a similar one for a mountain bike. This is what I have been more or less thinking along the lines of.

Yes I've also looked into developing some sort of vibration isolator or dmaper but am a little unsure as how to go about this and I'm currently looking into it.

The client provided the specification of the vertical displacement being of concern.

kind regards

then you need to pay attention to the information provided.

good luck

<ununsubscribe>

Just put some vibration sensors near the wheel mounts (front and back), and have oscillators that match the frequency-amplitude portion of all the vibrations, except phase shifted 180 degrees...i.e.- ultimate mechanical noise cancellation.

Do it, or I will send the Happineese Inquisitor to inspect your neckline.

Better way (my opinion) is make a grid of small camera eyes, say 6*6 or 8*8 or may be more, Multiplex all them and get the instantaneous output of cam eye which is at right location of grid, this means you will be recording all the frames of video but with a different eyes.

However this is not a totally mechanical solution.

That is a totally unusual approach, interesting!

This might give you some ideas.

First thing to do is study what's available now, then determine what works best and why, then see if you can make improvements....

https://www.youtube.com/watch?v=6X9JuCaySCk

...a dampened gimbal seems the best approach, but only experimentation tells the tale...and 'mechanical only' is limiting.....perhaps a camera that is suspended with rubber bands in a liquid filled globe....haha

This is pretty cool, but battery powered...

Fill a glass near the top and hold it far away from your body while running and trying not to spill it. Slowly move the glass closer to your torso and see how different the situation becomes. (While jogging along) Now pay attention to the action of your shoulder, elbow and wrist and apply what you've learned through observation.

You're halfway there.

Keep us posted.

Nah, just take the water and pour it on yourself now, and get it over with.

I resisted suggesting a cup of coffee.. ;).. but yeah

Hahaha, I for one, would somehow agree.

That is because you are a moron, and a tweaking tweaker.

invent a mini gyro https://www.gyroscope.com/d.asp?product=GYROSTABILIZER

I would go with Rakesh idea.

Have the cameras take as many frames a second as possible, then have a logic software program piece to together the individual frames into a seamless monologue.

Electronicly stabilize rather than mechanical, which is still mechanical of a different sort.

If you check camera stabilizer videos, they have a support for the camera connected to a structure ususlly from the bottom that help keep the camer in a vertical position in the longitudinal, transversal and vertical axis. The weight of the camera or an extra weight help keep it stable. You connect the base of the camera to a horizontal structure connected to a vertical ... connected to a transversal one so if the helmet moves, the camera stays more or least in the same angle respecting to the object you want in the video. Check youtube ....

I've been thinking that since the vertical vibration is essentially the problem, to design a sdof spring, damper system. From literature I've been able to identify the types of frequencies that a mountain bike experiences on the handlebar and helmet. My thought was to design the spring and damper to these frequencies.

No ones mentioned critical damping.

Sounds negative.

Try thinking happy thoughts.

You clued do the egg drop competition approach and tape it to a chicken and then tape the chickens feet to the handlebars.