Fun, Learning, Friendship and Mutual Respect START  HERE

Go Back   HeliFreak > R/C Helicopters > Aerodynamics, Physics and Engineering

Aerodynamics, Physics and Engineering Aerodynamics, Physics and Engineering Discussions

LinkBack Thread Tools Display Modes
Old 07-26-2012, 04:43 AM   #1 (permalink)
Registered Users

Join Date: Jul 2012
Location: South Africa
Exclamation CCPM advice

Good Day

I am working on a project which entails developing an algorithm capapble of carrying out the mixing function electronically for a single rotor (5 bladed) helicopter. I do not have much experience with rotary wing aircraft and have espent the last few days getting aquainted with the control characteristics pertinent to such aircraft.

In particular I need to obtain the relationship between the control inputs (collective & cyclic) and the actuator displacements which will produce the correct change in blade pitch. The actuators are attached to the lower, non-rotating swash plate. This information is vital for developing the algorithm - or rather, this is what I have assumed. Additionally, the algorithm should be capable of minimising the cross-soupling between inputs by pre-empting the cyclinders to take the appropriate corrective action when a certain control input/s is applied. Essentially the goal is to determine the mathematical relation between the control input and actuator displacement such that the mixing function is incorporated.

Could anyone kindly assist by pointing me in the correct direction to tackle this problem or additionally, advise as to appropriate references which would aid in helping me gain a fundamental understanding of the factors involved.

Many Thanks in advance

Any assitance would be greatly appreciated

Azhar is offline        Reply With Quote Quick reply to this message
Sponsored Links
Old 07-26-2012, 04:09 PM   #2 (permalink)
Registered Users

Join Date: Aug 2010
Location: AZ


There are many texts which describe control system/actuator theory. Rotary wing is substantially more complex than most realize; you will find that coupling is often beneficial, and that the rotor dynamics change dramatically in transitory flight, in autorotation, etc.

I would start with the classic reference materials; they approach these problems mathematically, but will also provide you the background you will need to get a decent start on your work:

Principles of Helicopter Aerodynamics, Gordon Leishman
Rotary-Wing Aerodynamics, Stepniewski/Keys
Helicopter Dynamics, Bramwell
"The problem with quotes found on the internet is you have no way of confirming their authenticity." - Abraham Lincoln
extrapilot is offline        Reply With Quote Quick reply to this message
Old 07-27-2012, 12:53 AM   #3 (permalink)
Registered Users
Thread Starter Thread Starter

Join Date: Jul 2012
Location: South Africa


I appreciate your input and will have a look at those texts. Thank you very much.

Have a great day
Azhar is offline        Reply With Quote Quick reply to this message

Quick Reply

Register Now

In order to be able to post messages on the HeliFreak forums, you must first register.
Please enter your desired user name, your REAL and WORKING email address and other required details in the form below.
User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.
Confirm Password:
Email Address
Please enter a valid email address for yourself. Use a real email address or you will not be granted access to the site. Thank you.
Email Address:
Where do you live? ie: Country, State, City or General Geographic Location please.
Name and Lastname
Enter name and last name here. (This information is not shown to the general public. Optional)
Helicopter #1
Enter Helicopter #1 type and equipment.
Helicopter #2
Enter Helicopter #2 type and equipment.
Helicopter #3
Enter Helicopter #3 type and equipment.
Helicopter #4
Enter Helicopter #4 type and equipment.


Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.

Thread Tools
Display Modes

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

Copyright © Website Acquisitions Inc. All rights reserved.
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.

SEO by vBSEO 3.6.1