mitch2
Geoff, how many degrees of freedom do you consider your springs have? Typically, a spring is thought to operate in only one degree of freedom, in the case of a vertical spring it would be the z direction. However, depending on the slenderness of the spring (i.e., length vs. diameter), and the weight of the object supported, perhaps a torsional force could allow the spring to rotate. I am curious how the isolation provided by your springs compares to an elastomer type spring such as the Herbies products.
>>>My springs isolate primarily in the vertical direction 🔝 only, but there can be some rotational 🔄 isolation depending on how the system is set up. But simple springs like mine offer no isolation in the horizontal plane 🔛. That’s why a lot of folks use roller bearings AND springs to get isolation in all six directions or most of them anyway. Springs should be selected based on mass of component and the whole shebang should have a very low resonant frequency, 2 or 3 Hz is very good, below 2 Hz even better as there’s a lot of Earth motion in the range 0-5 Hz. I suspect MOST of the vibration especially for the basement or first floor is in the vertical direction. 🔝 So why pay for a Mercedes when a Volkswagen will suffice?
Geoff, how many degrees of freedom do you consider your springs have? Typically, a spring is thought to operate in only one degree of freedom, in the case of a vertical spring it would be the z direction. However, depending on the slenderness of the spring (i.e., length vs. diameter), and the weight of the object supported, perhaps a torsional force could allow the spring to rotate. I am curious how the isolation provided by your springs compares to an elastomer type spring such as the Herbies products.
>>>My springs isolate primarily in the vertical direction 🔝 only, but there can be some rotational 🔄 isolation depending on how the system is set up. But simple springs like mine offer no isolation in the horizontal plane 🔛. That’s why a lot of folks use roller bearings AND springs to get isolation in all six directions or most of them anyway. Springs should be selected based on mass of component and the whole shebang should have a very low resonant frequency, 2 or 3 Hz is very good, below 2 Hz even better as there’s a lot of Earth motion in the range 0-5 Hz. I suspect MOST of the vibration especially for the basement or first floor is in the vertical direction. 🔝 So why pay for a Mercedes when a Volkswagen will suffice?