1. A method comprising observing an analog position signal of a control object in relation to positional indicia, recalling a previously stored runout correction value associated with the positional indicia, and calculating a corrected position signal for the control object in relation to a nonlinear combination of the position signal and the runout correction value.
2. The method of claim 1 wherein the corrected position signal is an analog signal.
3. The method of claim 2 further comprising demodulating the corrected position error signal to obtain a digital position error signal and moving the control object in relation to the position error signal.
4. The method of claim 3 wherein the positional indicia are characterized by servo dibit patterns on a storage medium.
5. The method of claim 4 wherein the control object is characterized as a transducer of a data storage device and the corrected position signal is in relation to an ideal position of the transducer with respect to a data track of the storage medium.
6. The method of claim 5 performed by executing computer instructions that are stored in memory.
7. The method of claim 1 wherein the calculating step is characterized by analytical regression of a nonlinear function in terms of the position signal and the runout correction value.
8. The method of claim 7 wherein the nonlinear function is characterized by the relationship:
ABcor=\u03b11ABm+\u03b12C+\u03b13C|ABm\u2212\u03b14C|
9. The method of claim 7 wherein the nonlinear function is characterized by the relationship:
AB
cor
=
a
\ue89e
\ue89e
0
\ue89e
(
AB
m
S
)
4
+
a
\ue89e
\ue89e
1
\ue89e
(
AB
m
S
)
3
+
a
\ue89e
\ue89e
2
\ue89e
(
AB
m
S
)
2
+
a
\ue89e
\ue89e
3
\ue89e
(
AB
m
S
)
+
a
\ue89e
\ue89e
4
where:
S=scaling factor (increments)
a0=b00C2+b10C+b20
a1=b01C2+b11C+b21
a2=b02C2+b12C+b22
a3=b03C2+b13C+b23
a4=b04C2+b14C+b24
10. An apparatus comprising:
a control object; and
a servo circuit configured to position the control object in response to a corrected position signal that is generated in relation to a nonlinear combination of an analog position signal of the control object in relation to positional indicia and a runout correction value associated with the positional indicia.
11. The apparatus of claim 10 wherein the corrected position signal is an analog signal.
12. The apparatus of claim 11 wherein the servo circuit comprises a demodulator that configures the corrected position error signal as a digital position error signal
13. The apparatus of claim 12 wherein the servo circuit comprises a servo controller that moves the control object in relation to the position error signal.
14. The apparatus of claim 13 wherein the positional indicia are characterized by servo dibit patterns on a storage medium.
15. The apparatus of claim 14 wherein the control object is characterized as a transducer of a data storage device and the corrected position signal is in relation to an ideal position of the transducer with respect to a data track of the storage medium.
16. The apparatus of claim 15 comprising computer instructions that are stored in memory and executed to control operations of the servo circuit.
17. The apparatus of claim 10 wherein the servo circuit calculates the corrected position signal in relation to an analytical regression of a nonlinear function in terms of the position signal and the runout correction value.
18. The apparatus of claim 17 wherein the nonlinear function is characterized by the relationship:
ABcor=\u03b11ABm+\u03b12C+\u03b13C|ABm\u2212\u03b14C|
19. The method of claim 17 wherein the nonlinear function is characterized by the relationship:
AB
cor
=
a
\ue89e
\ue89e
0
\ue89e
(
AB
m
S
)
4
+
a
\ue89e
\ue89e
1
\ue89e
(
AB
m
S
)
3
+
a
\ue89e
\ue89e
2
\ue89e
(
AB
m
S
)
2
+
a
\ue89e
\ue89e
3
\ue89e
(
AB
m
S
)
+
a
\ue89e
\ue89e
4
where:
S=scaling factor (increments)
a0=b00C2+b10C+b20
a1=b01C2+b11C+b21
a2=b02C2+b12C+b22
a3=b03C2+b13C+b23
a4=b04C2+b14C+b24
20. An apparatus comprising:
a control object; and
means for positioning the control object in response to a nonlinear combination of an observed position of the control object with respect to positional indicia and a previously stored runout correction value associated with the positional indicia.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A filter assembly for use in filtering stormwater, comprising:
a bottom including a boss that includes a rib extending laterally along an inner surface of the boss, the rib including a locking portion that mates with a corresponding locking portion on a peripheral surface of a connection to an outlet conduit for securing the bottom to the connection thereby inhibiting rotation of the bottom relative to the outlet conduit;
a center tube secured to the bottom using a locking mechanism that inhibits relative movement between the bottom and the center tube, the center tube being in communication with an opening in the bottom;
a hood secured to the center tube; and
a filter medium located between the hood and the center tube.
2. The filter assembly of claim 1, wherein the hood and center tube include corresponding interlocking structure that inhibit rotation of the hood relative to the center tube with the hood secured to the center tube.
3. The filter assembly of claim 1 further comprising an outer screen secured to the bottom at a bottom portion of the outer screen to inhibit relative movement between the outer screen and the bottom.
4. The filter assembly of claim 3, wherein the outer screen is secured to the bottom using a fastener that is inserted through a peripheral wall of the bottom, through the outer screen and into the bottom.
5. The filter assembly of claim 1 further comprising a top ring that receives an upper edge of an outer screen within a groove, the outer screen located between the hood and the filter medium.
6. The filter assembly of claim 5, wherein the top ring is secured to the outer screen with a fastener inserted through an outer portion of the top ring, through the outer screen and into an inner portion of the top ring.
7. The filter assembly of claim 1 further comprising an inner drainage space cap that is connected to an upper extending end of the center tube that extends beyond an opening in the hood.
8. The filter assembly of claim 7, wherein the inner drainage space cap includes a gasket, the gasket engaging the hood forming an air-tight seal therebetween.
9. The filter assembly of claim 8, wherein the inner drainage space cap includes a check valve that is configured to permit air to escape but not enter a drainage space within the center tube such that a siphon can be established during operation.
10. The filter assembly of claim 1, wherein a height of the filter media is more than about 20 inches.
11. The filter assembly of claim 1, wherein the hood has a top having a series of ribs extending radially between a periphery of the top and a center of the top.
12. The filter assembly of claim 1, wherein the hood includes ribs extending outwardly from an outer periphery of the hood, the ribs being configured to maintain some spacing between stacked hoods.
13. A method of assembling a filter assembly for use in filtering stormwater, the method comprising:
securing a center tube to a bottom using a locking mechanism inhibiting relative movement between the bottom and the center tube, the center tube being in communication with an opening in the bottom;
securing a hood to the center tube inhibiting relative movement between the center tube and the hood;
providing a filter media between the hood and the center tube; and
applying a rotational force to the assembly which causes the center tube and bottom to rotate during installation.
14. The method of claim 13 further comprising securing an outer screen to the bottom at a bottom portion of the outer screen to inhibit relative movement between the outer screen and the bottom, the outer screen positioned between the hood and the filter media.
15. The method of claim 14, wherein the step of securing the outer screen to the bottom comprises inserting a fastener through a peripheral wall of the bottom, through the outer screen and into the bottom.
16. The method of claim 14, wherein the step of locating the outer screen on the bottom comprises positioning the bottom portion of the outer screen within a gap formed between the radially extending rib and the peripheral outer wall.
17. The method of claim 14 further comprising placing an upper edge of the outer screen within a top ring having a groove sized to receive the upper edge of the outer screen.
18. The method of claim 17 further comprising securing the outer screen to the top ring by inserting a fastener through an outer portion of the top ring, through the outer screen and into an inner portion of the top ring.
19. The method of claim 14 further comprising connecting an inner drainage space cap onto an upper extending end of the center tube that extends beyond an opening in the hood, the inner drainage space cap including a rim having a gasket, the gasket engaging the hood forming an air-tight seal therebetween.
20. The method of claim 19, wherein the inner drainage space cap includes a check valve that is configured to permit air to escape but not enter a drainage space within the center tube such that a siphon can be established during operation.
21. The method of claim 13 further comprising securing the bottom onto an outlet conduit connection by rotating the hood, center tube and bottom together, the bottom including a boss that includes a tab portion that mates with a corresponding recess portion on a peripheral surface of the outlet conduit connection for securing the bottom to the outlet conduit connection thereby inhibiting rotation of the bottom relative to the outlet conduit connection and providing positive feedback that the bottom is secured to the outlet conduit connection.
22. A stormwater treatment system for use in filtering stormwater, comprising:
an outlet conduit connection that connects to a filter conduit for use in delivering filtered stormwater toward an outlet of the stormwater treatment system, the outlet conduit connection comprising a locking portion on a peripheral surface of the outlet conduit connection; and
a filter assembly comprising
a bottom including a boss that includes a rib extending laterally along an inner surface of the boss, the rib including a locking portion that mates with the snap lock portion on the peripheral surface of the outlet conduit connection for securing the bottom to the outlet conduit connection thereby inhibiting rotation of the bottom relative to the outlet conduit connection;
a center tube secured to the bottom using a locking mechanism that inhibits relative movement between the bottom and the center tube, the center tube being in communication with an opening in the bottom and the outlet conduit connection;
a hood secured to the center tube; and
a filter media between the hood and the center tube.
23. The stormwater treatment system of claim 22, wherein the outlet conduit connection includes an outwardly extend rib that mates with a bottom of the bottom.
24. The stormwater treatment system of claim 22 further comprising a outlet conduit connection mount located between the outlet conduit connection and filter conduit.
25. A filter assembly for use in filtering stormwater, comprising:
a housing structure;
a drainage space within the housing structure; and
a filter medium between the drainage space and housing structure;
wherein the housing structure includes a lower portion with a mount opening for mating with an outlet conduit connection, the mount opening including a pair of circumferentially extending and diametrically opposed ribs extending radially inwardly.
26. The filter assembly of claim 25, wherein each rib includes a locking tab at one end thereof, the locking tab formed by a raised protrusion of the upper surface of the rib.