Automotive Spring and damper on rocker

  • Thread starter Thread starter LowBlackFast
  • Start date Start date
  • Tags Tags
    Damper Spring
AI Thread Summary
The discussion explores the concept of using a progressive pull spring and a digressive shock on a rocker to manage axle timing and rotation. The proposed system aims to create a dynamic response where the spring becomes solid under torque, reducing axle rotation speed, while the shock softens as velocity decreases, allowing for controlled compliance. The interaction of these components is likened to a series mass damper, although the mathematical modeling is acknowledged as complex. Participants emphasize the importance of understanding the forces involved, leading to a second-order differential equation that defines the system's behavior. The goal is to achieve timed compliance while maintaining torque at the axle.
LowBlackFast
Messages
2
Reaction score
1
Can someone help me evaluate an idea that I have?
I'm investigating the idea of placing a very progressive pull spring and a digressive shock on a rocker to control the timing and rotation of an axle.

I could be way off, but here's the scenario in my head. Both shock and spring are being pulled when a torque is applied. Spring is progressive, eventually hitting a bushing and going solid. The shock is digressive in rebound and significantly stiffer than the spring at high speed. But as the spring goes solid rotation speed of the axle will decrease. As the velocity decreases the shock becomes softer, thus allowing rotational compliance that can be "timed"

I apologize in advance if I'm ignoring some fundamentals. I believe this would act in a similar manner as a series mass damper? I'm not sure on the math. It's kinda over my head.

Thanks
 

Attachments

  • Screenshot 2023-01-15 162118.jpg
    Screenshot 2023-01-15 162118.jpg
    24.8 KB · Views: 115
Engineering news on Phys.org
What I'm aiming to gain is timed compliance while maintaining the torque applied at the axle.
 
Last edited by a moderator:
Hi LowBlackFast. This site explains the spring mass damper. https://www.shimrestackor.com/Physics/Spring_Mass_Damper/spring-mass-damper.htm

When you add all the forces of each component (the load, the damper, and the spring) you get a 2nd order differential equation. The solution the characteristic equation are the constants are tau and zeta. It seems like you are wanting the frequency which is a function of tau and zeta.
 
Last edited:
Posted June 2024 - 15 years after starting this class. I have learned a whole lot. To get to the short course on making your stock car, late model, hobby stock E-mod handle, look at the index below. Read all posts on Roll Center, Jacking effect and Why does car drive straight to the wall when I gas it? Also read You really have two race cars. This will cover 90% of problems you have. Simply put, the car pushes going in and is loose coming out. You do not have enuff downforce on the right...
I'm trying to decide what size and type of galvanized steel I need for 2 cantilever extensions. The cantilever is 5 ft. The space between the two cantilever arms is a 17 ft Gap the center 7 ft of the 17 ft Gap we'll need to Bear approximately 17,000 lb spread evenly from the front of the cantilever to the back of the cantilever over 5 ft. I will put support beams across these cantilever arms to support the load evenly
Thread 'What's the most likely cause for this carbon seal crack?'
We have a molded carbon graphite seal that is used in an inline axial piston, variable displacement hydraulic pump. One of our customers reported that, when using the “A” parts in the past, they only needed to replace them due to normal wear. However, after switching to our parts, the replacement cycle seems to be much shorter due to “broken” or “cracked” failures. This issue was identified after hydraulic fluid leakage was observed. According to their records, the same problem has occurred...

Similar threads

Back
Top