Talk:Piston motion equations

message: What cleanup changes would be required (I am still failrly new to Wiki)...?
joecar
joecar I agree. Very clean, precise, succinct and well written article.
David UtidjianPortknocker 04:22, 1 September 2006 (UTC)

message: How efficiently does a crankshaft convert reciprocating motion to circular motion? It would be 100% if the force on the crank pin always acted tangentially to the circumference of rotation. But this occurs only at one point within 180°. All other points depend on the angle between the connecting rod and the circumference of rotation. A scotch yoke gives a sine wave. What does a crankshaft give?
AdrianAbel (talk) 16:58, 23 April 2009 (UTC)
thread_title:  Efficiency 

message: To whomever add this animation:
This animation doesn't make sense... the crank/rod/piston mechanism in an internal combustion engine (as stated at the beginning of this article) has a fixed length rod and a fixed radius crank... your 4D animation shows a variable length rod and variable radius crank... that doesn't fit in this article, it should have its own article regarding "variable geometry" mechanism.  —Preceding unsigned comment added by Joecar (talk • contribs) 08:36, 26 February 2010 (UTC)
replies: text: You're right, I created another animation containing three pistons with the parameters of your example graph of piston motion : same values and same colors.Patrhoue 16:10, 8 August 2011 (UTC)
thread_title:  4D Animation 

message: What if the article is a derivation from first principles...?  —Preceding unsigned comment added by 72.129.20.215 (talk) 06:04, 15 May 2010 (UTC)
replies: text: Thank, I have uploaded a new animation.Patrhoue 21:31, 20 September 2012 (UTC)
thread_title:  This article does not cite any references or sources. 

message: I tried to add this desmos link to the page showing position velocity acceleration ect of a piston with various rod ratios but it was taken down so If someone wants to add it to the links so that the next person can visualize accelerations of pistons 
https://www.desmos.com/calculator/xalfht9bqc  — Preceding unsigned comment added by 107.167.221.147 (talk) 19:42, 29 August 2020 (UTC)
thread_title:  Additional Links 

message: Someone changed the position in angle domain to the incorrect equation. I have since fixed this. If you believe that it is currently wrong please discuss here before making changes.  — Preceding unsigned comment added by ConanTheGardener (talk • contribs) 06:49, 4 October 2020 (UTC)
thread_title:  Position 

message: I strongly suggest to avoid over-reducing the derivative expressions since doing so leaves the final expressions more complicated compared to keeping the separate terms.
And, for example, the final expression of x' (velocity wrt angle) does not allow logical follow on to x" (acceleration wrt angle).
Keeping the separate terms gives insight into the contributing components of what would be call complex harmonic motion.
And it appears that over-reducing has introduced errors in the final expressions. joecar (talk) 00:44, 6 November 2020 (UTC)
thread_title:  Avoid over-reducing derivative expressions 

message: The discussion of velocity following the velocity-wrt-angle expression should really be in a separate section, possibly its own section.
Also the discussion should be rephrased in terms of range -180° to 0° and range 0° to 180°.
The discussion does not seem correct, it compares to r.sin(A) instead 1 which is the first term inside the parens of the velocity expression).
And the discussion should include acceleration, or accel could have its own section. joecar (talk) 00:24, 8 November 2020 (UTC)
thread_title:  Discussion of velocity in angle domain 

message: 11:17, 8 November 2020 by joecar
Simplified rearranging of position equation.
Removed factoring of velocity and acceleration equations.
Corrected multiplicative dots.
Added missing multiplicative dots. joecar (talk) 11:33, 8 November 2020 (UTC)
thread_title:  Simplification and style 

message: Please keep the final angle domain equations in simplified form. If you want to further manipulate the equations then please add a subsection for this (including a sentence indicating the intent of the maniipulation).
Thank You.
:) joecar (talk) 02:11, 20 December 2020 (UTC)
thread_title:  Keep final equations in simplified form 

message: Should this be added as a section here?  — Preceding unsigned comment added by 2604:2D80:9C8E:D100:8C6E:CD37:DDFE:547A (talk) 01:52, 17 February 2021 (UTC)
thread_title:  Désaxé engines' Piston motion equation