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  • Anil Kumar. M

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Reduce vibrations or change the sensors?

Started this discussion. Last reply by Allen Babb Mar 19, 2012. 5 Replies

Hello all       I am using adxl335 3-axis accelerometer and lpr5150al 2 axis gyro in IMU. This Imu is catching up vibrations, due to which i am not able to get stable pitch and raw values. IMU gives…Continue

Tags: reduction, vibration, lprl5150al, ADXL335

Light and strong Aluminium quadframe.

Started this discussion. Last reply by Jordan May 4, 2012. 1 Reply

Hello   what size , shaped and thickness of aluminum tubes can make strong and light quadcopter frame.I am using hxt dt750 motors with 11*4.7 props and I am looking for simple ways to build light and…Continue

 

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Jordan replied to anamr's discussion Light and strong Aluminium quadframe.
"get some 10mm square aluminum tube from your local hardware store. drill two holes at each end(for center hub and motors), get some sheet aluminum or CF drill some holes in it for the arms that from before, use some little hex bolts +…"
May 4, 2012
Allen Babb replied to anamr's discussion Reduce vibrations or change the sensors?
"Well what software are you using?"
Mar 19, 2012
anamr replied to anamr's discussion Reduce vibrations or change the sensors?
"Okay. Thank you.   Good news is that, the problem is solved . Built a new aluminium frame and used sponge as vibration dampener. I could really notice the difference between the old and the new quad frame. "
Feb 23, 2012
Bot Thoughts replied to anamr's discussion Reduce vibrations or change the sensors?
"Sorry for the confusion -- I was curious about which IMU you were using. Can you could tell which sensor was causing the most problem? If you can ecord/log raw sensor readings along with time then you could transform to frequency domain and see if…"
Feb 20, 2012
anamr replied to anamr's discussion Reduce vibrations or change the sensors?
"HI        IMU is inertial measurement unit. I guess both accelerometer and gyro are getting affected by vibrations. But not totally sure about that. I am using Kalman filter for state estimation. I have been tweaking it…"
Feb 20, 2012
Bot Thoughts replied to anamr's discussion Reduce vibrations or change the sensors?
"Haven't used either. What is the IMU? What software? What sensors are the vibrations affecting? Is it a gyro issue or an accelerometer issue? If you get a sense of the frequencies where the vibration is causing the most problems it may be…"
Feb 19, 2012
anamr posted a discussion

Reduce vibrations or change the sensors?

Hello all       I am using adxl335 3-axis accelerometer and lpr5150al 2 axis gyro in IMU. This Imu is catching up vibrations, due to which i am not able to get stable pitch and raw values. IMU gives stable output at lower rpm of bl motor. (hextronik dt750 + 25A basic ESC). I have used rubber sheet to dampen vibrations ,however at higher rpm of motor it did not make much difference. I am still finding other ways to reduce vibrations. And to mention my IMU lands directly on aluminum quad frame…See More
Feb 18, 2012
Anil Kumar. M left a comment for anamr
"With my experience and research if you are going build using locally available Aluminium frames then for the specs you mentions you should go with either 3/4" or 1 inch SQUARE al pipes (instead of round ones). Its easy to drill and fix the…"
Feb 5, 2012
Anil Kumar. M left a comment for anamr
"Hi, The Quadframe weighed around ~290 gms and ~970 gms with everything fixed."
Feb 5, 2012
anamr posted a discussion

Light and strong Aluminium quadframe.

Hello   what size , shaped and thickness of aluminum tubes can make strong and light quadcopter frame.I am using hxt dt750 motors with 11*4.7 props and I am looking for simple ways to build light and strong quad frame using aluminum. My payload is approx 1kg ie battery+camera+electronics. If you have already made aluminum quad frames ,then do share your experienceSee More
Feb 5, 2012
anamr commented on John Church's photo
Thumbnail

Quad Rev.A

"HI what is the weight of your quadframe. what are its dimensions.?"
Feb 5, 2012
anamr commented on Anil Kumar. M's blog post Build new Quad + frame
"Nice quadframe. what is the weight of your quadframe (excluding other components).? "
Feb 5, 2012
anamr commented on Joel's photo
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Quad Copter Frame

"whats the weight of this quadframe...?..and what are the dimensions of quadframe and propellers? "
Feb 5, 2012

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Comment Wall (2 comments)

At 10:18pm on February 5, 2012, Anil Kumar. M said…

Hi, The Quadframe weighed around ~290 gms and ~970 gms with everything fixed.

At 10:34pm on February 5, 2012, Anil Kumar. M said…

With my experience and research if you are going build using locally available Aluminium frames then for the specs you mentions you should go with either 3/4" or 1 inch SQUARE al pipes (instead of round ones). Its easy to drill and fix the components. the center frame can be fixed using a aluminium fish plate. Overall the frame should weigh less than 300gms. And you have mentioned that  you are going to use 11x4.7 props which are really larger ones. So for that I recommend you should take minimum 16" for each arm so that you can minimise turbulence. The length of the frame makes 32" from one end of the arm to the other end. Try once, make some experiments with the arm sizes. But make sure that the lengths are exact and to most accurate so that to achieve stable flight. You can use a bench drill for drilling holes.

CAREFUL WHEN DRILLING HOLES AND BUILDING THE FRAME AND ALSO WITH THE PROP BLADES. OTHER WISE YOU MAY END UP CUTTING YOUR FINGERS OR HANDS AND ALSO THE PROPS MAY BREAK. I AM TELLING YOU THIS WITH MY EXPERIENCE.

http://diydrones.com/photo/propeller-cut-injury?context=user#

All the best and have a nice and safe flight.

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