As the subject line says, I'd like to learn about stable platform technology in suspension system. I've done a bit of googling, and I think I have the basic concept: the suspension is stiff at low frequencies, but compliant at high frequencies. Feel free to correct me if I'm wrong.
I'd like to learn a little more... How do you achieve this goal? Is there a suspension primer that describes the techniques that different companies use? I've heard of Fox's inertial damper, Rock Shox' motion control, etc., but I'd like to see an explanation of how they work. Maybe I need to look at motorcycle suspensions?
As the subject line says, I'd like to learn about stable platform technology in suspension system. I've done a bit of googling, and I think I have the basic concept: the suspension is stiff at low frequencies, but compliant at high frequencies. Feel free to correct me if I'm wrong.
I'd like to learn a little more... How do you achieve this goal? Is there a suspension primer that describes the techniques that different companies use? I've heard of Fox's inertial damper, Rock Shox' motion control, etc., but I'd like to see an explanation of how they work. Maybe I need to look at motorcycle suspensions?
"dvt" <[email hidden]> wrote in message news:[email hidden]...
Quoted message said:
As the subject line says, I'd like to learn about stable platform technology in suspension system. I've done a bit of googling, and I think I have the basic concept: the suspension is stiff at low frequencies, but compliant at high frequencies. Feel free to correct me if I'm wrong.
I'd like to learn a little more... How do you achieve this goal? Is there a suspension primer that describes the techniques that different companies use? I've heard of Fox's inertial damper, Rock Shox' motion control, etc., but I'd like to see an explanation of how they work. Maybe I need to look at motorcycle suspensions?
Thanks for any help you can offer.
-- Dave dvt at psu dot edu
It is hard to separate the fact from the hype in the bike industry. Stable platform shocks are suppose to not react on forces from above (the rider), like pedal induced bob and brake dive. And still soak up the bumps in the trail. Some complain that they do loose some small bump compliance. I have not bought a new shock in two years so I have no first hand knowledge.
"dvt" <[email hidden]> wrote in message news:[email hidden]...
Quoted message said:
As the subject line says, I'd like to learn about stable platform technology in suspension system. I've done a bit of googling, and I think I have the basic concept: the suspension is stiff at low frequencies, but compliant at high frequencies. Feel free to correct me if I'm wrong.
I'd like to learn a little more... How do you achieve this goal? Is there a suspension primer that describes the techniques that different companies use? I've heard of Fox's inertial damper, Rock Shox' motion control, etc., but I'd like to see an explanation of how they work. Maybe I need to look at motorcycle suspensions?
Thanks for any help you can offer.
-- Dave dvt at psu dot edu
It is hard to separate the fact from the hype in the bike industry. Stable platform shocks are suppose to not react on forces from above (the rider), like pedal induced bob and brake dive. And still soak up the bumps in the trail. Some complain that they do loose some small bump compliance. I have not bought a new shock in two years so I have no first hand knowledge.
As the subject line says, I'd like to learn about stable platform technology in suspension system. I've done a bit of googling, and I think I have the basic concept: the suspension is stiff at low frequencies, but compliant at high frequencies. Feel free to correct me if I'm wrong.
I'd like to learn a little more... How do you achieve this goal? Is there a suspension primer that describes the techniques that different companies use? I've heard of Fox's inertial damper, Rock Shox' motion control, etc., but I'd like to see an explanation of how they work. Maybe I need to look at motorcycle suspensions?
There are automotive texts from as far back as at least the 1930s that deal with this adequately from the standpoint of hydraulic shock absorber design, but you'll very hard-pressed to find them in most libraries. There are hints in some of the tech bulletins from various sources within the automotive industry, but once again, good luck finding them. It's primarily a matter of valving issues; the valve opening pressures and sizes need to be closely matched to the load and the motion ranges expected for the unit. From what I have seen so far, it does not appear that the majority of bike shocks incorporate any such features to any meaningful extent. -- Typoes are a feature, not a bug. Some gardening required to reply via email. Words processed in a facility that contains nuts.
The patent referenced on that page is also interesting; go to www.uspto.gov, click search/patent number search, and enter the patent number (6,581,948) to view it.
In the Fox system, the damping seems to be adjusted, not the spring rate. And it appears that the damping is changed depending on whether the wheel moves up (i.e. a bump) or the fork crown is pushed down (i.e. pedal forces).
