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Participant

Join Date: Mar 2017
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Final Year Mechanical Project GoPro Cam Stabilizer

03/31/2017 9:39 AM

Hello Everyone

I am in my my final year of study, mechanical engineering (undergraduate) and would like your assistance/input with regards to my design project.

I am required to fully design a GoPro stabilizer which can be mounted onto a mountain bike handlebar/Helmet of rider.

The design is primarily to reduce the vertical displacement/vibration which is experienced by a mountain bike when ridden across terrain such as a dirt road.

This is so as to stabilize the GoPro camera and reduce shaky or blurry camera recording

The design should be fully mechanical

The user specifications has been attached below.

I am unsure of what exactly I need to design for. A spring and damper system ?

In addition calculations are required to be performed on the design and I dont know what calculations I should consider.

Thank you for all the help.

kind regards.

The specifications are as follows

· The designed stabilizer should be mechanically operable.

· The size of the stabilizer should not exceed the dimensions of L x B x H = 150mm x 150mm x 250mm.

· The stabilizer should not exceed the following weight restrictions. Handlebar mount (500g) and Helmet mount (250g).

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#1

Re: Final Year Mechanical Project GoPro Cam Stabilizer

03/31/2017 10:12 AM

Treat it as a mechanical low-pass filter.

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Participant

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#14
In reply to #1

Re: Final Year Mechanical Project GoPro Cam Stabilizer

04/01/2017 4:38 AM

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

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#15
In reply to #14

Re: Final Year Mechanical Project GoPro Cam Stabilizer

04/01/2017 4:46 AM

I assume it's reference to a rhetorical device?

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#19
In reply to #15

Re: Final Year Mechanical Project GoPro Cam Stabilizer

04/01/2017 12:13 PM

Your car is riding on four of them.

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#21
In reply to #14

Re: Final Year Mechanical Project GoPro Cam Stabilizer

04/01/2017 12:25 PM

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.

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#2

Re: Final Year Mechanical Project GoPro Cam Stabilizer

03/31/2017 10:58 AM

Typically CR4 will not do homework but will help anyone (including students) with technical problems. So far your posted question has an appearance (not necessarily your intent) that is more "I need someone to do my homework" and less "I need help with a technical problem I have been working on."

Sharing a little bit of your thought process and work done so far will help make the posting look less like a homework problem.

Have you put thought into springs and mechanical dampers? Did it seem like a good direction?

Have you thought about anything else mechanical beside springs and dampers?

How did you decide that your primary concern was vertical displacement?

Does Andrew's suggestion of looking at this as a mechanical low pass filter make sense?

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#16
In reply to #2

Re: Final Year Mechanical Project GoPro Cam Stabilizer

04/01/2017 4:58 AM

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

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#17
In reply to #16

Re: Final Year Mechanical Project GoPro Cam Stabilizer

04/01/2017 5:03 AM

then you need to pay attention to the information provided.

good luck

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#25
In reply to #16

Re: Final Year Mechanical Project GoPro Cam Stabilizer

04/03/2017 8:45 AM

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.

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#3

Re: Final Year Mechanical Project GoPro Cam Stabilizer

03/31/2017 11:38 AM

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.

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#8
In reply to #3

Re: Final Year Mechanical Project GoPro Cam Stabilizer

03/31/2017 3:53 PM

That is a totally unusual approach, interesting!

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#4

Re: Final Year Mechanical Project GoPro Cam Stabilizer

03/31/2017 11:58 AM

This might give you some ideas.

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#5

Re: Final Year Mechanical Project GoPro Cam Stabilizer

03/31/2017 12:19 PM

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

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#6
In reply to #5

Re: Final Year Mechanical Project GoPro Cam Stabilizer

03/31/2017 12:43 PM

This is pretty cool, but battery powered...

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#7

Re: Final Year Mechanical Project GoPro Cam Stabilizer

03/31/2017 2:03 PM

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.

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#9
In reply to #7

Re: Final Year Mechanical Project GoPro Cam Stabilizer

03/31/2017 3:54 PM

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

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#11
In reply to #9

Re: Final Year Mechanical Project GoPro Cam Stabilizer

03/31/2017 5:16 PM

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

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#12
In reply to #9

Re: Final Year Mechanical Project GoPro Cam Stabilizer

03/31/2017 5:42 PM

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#13
In reply to #12

Re: Final Year Mechanical Project GoPro Cam Stabilizer

04/01/2017 2:49 AM

Hahaha, I for one, would somehow agree.

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#26
In reply to #13

Re: Final Year Mechanical Project GoPro Cam Stabilizer

04/03/2017 8:59 AM

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

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#24
In reply to #12

Re: Final Year Mechanical Project GoPro Cam Stabilizer

04/03/2017 8:40 AM

How did you know I was such a great coach?!

arigato gozaimas (thank you very much).

I will be sure to report you to the Inquisitor, so you can be next to hand upside down in the pit. Buddhists are the leading edge of the tolerant intolerant left. This was known in the 16th Century. Why do you doubt this now? In the meantime, you have the option of throwing out all your symbols of Christianity, and then be ready to step on the image of Jesus. Don't worry, you can be absolved many times after you apostatize.

On the other hand, if the gospel were not the truth, why does the heathen strive so hard to rub out the good news?

You decide.

I expect this response to this thread will last about 30 seconds.

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#29
In reply to #24

Re: Final Year Mechanical Project GoPro Cam Stabilizer

04/05/2017 1:13 AM

Please take your soap box to the breakroom....

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#10

Re: Final Year Mechanical Project GoPro Cam Stabilizer

03/31/2017 4:00 PM
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#18

Re: Final Year Mechanical Project GoPro Cam Stabilizer

04/01/2017 9:05 AM

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.

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#20

Re: Final Year Mechanical Project GoPro Cam Stabilizer

04/01/2017 12:24 PM

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 ....

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#22

Re: Final Year Mechanical Project GoPro Cam Stabilizer

04/03/2017 7:03 AM

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.

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#23

Re: Final Year Mechanical Project GoPro Cam Stabilizer

04/03/2017 7:26 AM

No ones mentioned critical damping.

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#28
In reply to #23

Re: Final Year Mechanical Project GoPro Cam Stabilizer

04/03/2017 12:48 PM

Sounds negative.

Try thinking happy thoughts.

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#27

Re: Final Year Mechanical Project GoPro Cam Stabilizer

04/03/2017 11:04 AM

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

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