PedroCG
Automotive
- Dec 17, 2008
- 53
Hi, the past month or so i've been diving in this subject, i've read some Race Engine Technology articles by prof Blair and Associates and whats available trough google books of Norton's "Camshaft Design and Manufacturing".
My objective is to develop an accurate enough software to predict valve train dynamics for a direct acting (bucket) system. The software will be used to project a cam for a FSAE car.
I'll use this thread to get some help in some questions.
The first thing i looked at was those 3 arc cams then polynomials and then splines. Splines prove to be the best, all polynomials will work but some will be more troublesome than others to "fine tune".
So my first question is: whats the problem with infinite jerk? 3 arc cams have infine jerk at the inflection points, they also have less area under the displacement for higher acceleration values and those are clear disavantages, but the jerk part i dont understand since its not related directly to force it will not cause loss of contact. i guess
My objective is to develop an accurate enough software to predict valve train dynamics for a direct acting (bucket) system. The software will be used to project a cam for a FSAE car.
I'll use this thread to get some help in some questions.
The first thing i looked at was those 3 arc cams then polynomials and then splines. Splines prove to be the best, all polynomials will work but some will be more troublesome than others to "fine tune".
So my first question is: whats the problem with infinite jerk? 3 arc cams have infine jerk at the inflection points, they also have less area under the displacement for higher acceleration values and those are clear disavantages, but the jerk part i dont understand since its not related directly to force it will not cause loss of contact. i guess