Valve Geom
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Valve Port Geometry
Parameters defining the valve port geometry and calculation conditions of shaft velocity, clicker settings and maximum force to be applied to the shim stack.
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Damper GeometryThe damper geometry block specifies the basic shock dimensions. There are four parameters:
----------------------------------------------------------------------------------------Suspension Stroke (BVc, MVr, MVc)There are two types of valves in shock absorbers: mid-valves and base-valves. The base valve, or compression adjuster, is generally located on the opposite end of the shock from the damper rod entrance. As the damper rod is forced into the shock, fluid is forced out through the base valve into the fluid reservoir. Since the damper rod has a small diameter the flow rate through the base valve is very small. The base valve is usually used for compression damping and is specified in ReStackor by setting the Vspec keyword to BVc. A mid-valve is located on the end of the damper rod. As the damper rod is forced into the shock fluid is forced through the mid valve to fill in the volume behind the valve. On compression stroke, MVc, the entire face of the mid-valve is pressurized. On the rebound stroke, MVr, only the annulus between the damper rod and valve OD is pressurized. Setting Vspec keyword to MVc (mid-valve compression), MVr (mid-valve rebound) or BVc (base valve compression) sets ReStackor to run the different strokes. Fluid flow direction on the mid-valve compression, MVc, and base valve compression, MVc, stroke. ----------------------------------------------------------------------------------------User KeyReStackor also uses the Vspec keyword to get your user key and enter your code key. To extract your user key set the Vspec keyword to Ukey, hit the run button and the pop up execution window will show your user key. ReStackor code keys are purchased through PayPal, enter your credit card info and at checkout the confirmation page will prompt "-- CLICK Here to enter your user key". Click the prompt, enter your user key and your companion code key will be emailed to you. To enter your code key set Vspec to Ckey, run the code and the pop-up execution window will prompt you to enter your purchased code key.
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Valve GeometryThe valve geometry input block describes the dimensions of the valve port.
The parameters d.port, w.port and N.port define the valve port flow area. The additional parameters D.thrt and N.thrt handle special cases where flow restrictions in the port further restrict the flow. The parameters N.thrt and D.thrt can also be used to model valves using multiple side ports to feed a single valve port.
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SettingsThe settings input block describe the clicker position and suspension velocity used for the calculation.
The relationship of bump height, bike speed and suspension velocity for different wheel sizes are given here. With an estimate of the suspension velocity, say a three inch bump hit a 30 mph, you can design crossover gaps, backing shims or the stack taper to produce a specific damping force at the suspension velocity produced by a given bump height.
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