Having thus described our invention, what we claim as new and desire to secure by Letters Patent is as follows:
1. A method for controlling data traffic at an access node of a packet switching network, said data traffic being provided from sources which continue to transmit traffic only where acknowledgments of previously-transmitted traffic are received on a predetermined basis, said access node implementing a leaky bucket admission control mechanism in which tokens are added to the pool at a predetermined rate, said method comprising the steps of:
receiving and temporarily storing each incoming packet;
testing the number of tokens available in the token pool against first and second thresholds having values greater than zero;
discontinuing acknowledgements of received packets where the test reveals the number of available tokens is less than the first threshold and packet acknowledgments are being provided to the packet source;
resuming acknowledgments of received packets where the number of available tokens is greater than a second threshold and acknowledgments are not being provided to the packet source; and
transmitting the stored packet and decrementing the token pool.
2. A system for controlling data traffic at an access node of a packet switching network, said data traffic being provided from sources which continue to transmit traffic only where acknowledgments of previously-transmitted traffic are received on a predetermined basis, said access node implementing a leaky bucket admission control mechanism in which tokens are added to the pool at a predetermined rate, said method comprising:
a packet buffer for receiving and temporarily storing each incoming packet;
a comparator for testing the number of tokens available in the token pool against first and second thresholds having values greater than zero;
acknowledgment controlling logic responsive where the test reveals the number of available tokens is less than the first threshold and packet acknowledgments are being provided to the packet source to discontinue generating such acknowledgments and responsive where then umber of available tokens is greater than a second threshold and acknowledgments are not being provided to the packet source for resuming generation of such acknowledgments;
a network interface to transmit the packet stored in the buffer; and
token pool logic responsive to transmission of the packet for decrementing the token pool.
3. A computer readable memory device, comprising; said computer readable memory device containing instructions for practice of the method of claim 1.
4. Electromagnetic signal propagated over a computer network, comprising: said electromagnetic signals having instructions for practice of the method of claim 1.
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 method of manufacturing an elliptic deep-drawn product, comprising:
a first series of steps of providing an intermediate product, the steps including
placing a blank on a spinning forming die,
pressing the blank onto the forming die with a spinning bar, and
forming a substantially round formed portion of a U-shaped cross-section; and
a second series of steps of providing an end product, the steps including
placing the intermediate product in a press working die, and
causing deformation with the press working die in a semicircle of the substantially round formed portion to form an elliptic portion, and also
causing deformation in another semicircle of the substantially round formed portion to form the substantially round formed portion into a final shape.
2. The method according to claim 1, wherein the end product is a nacelle lip of an airplane engine, the nacelle lip having an upper lip portion and a lower lip portion, the upper lip portion having a shape of a part of an ellipse, and the lower lip portion having a shape of a part of a circle.
3. The method according to claim 1, further comprising the step of trimming inner and outer redundant members of the intermediate product prior to performing the second series of steps.
4. The method according to claim 3, wherein the step of trimming provides an outer flange with an edge having a maximum distance B1 from the substantially round formed portion at an upper lip portion, and an edge having a maximum distance B2 (B2<B1) from the substantially round formed portion at a lower lip portion.
5. The method according to claim 3, wherein the step of trimming provides an outer flange with an edge having a maximum distance B1 from the substantially round formed portion at an upper lip portion, the outer flange being cut into an elliptical shape when viewed in a plan view.
6. The method according to claim 1, wherein the step of causing deformation with the press working die in a semicircle of the substantially round formed portion to form an elliptic portion is performed by placing the substantially round formed portion on a circular portion and an elliptic protrusion of a continuous ring of the press working die.
7. The method according to claim 1, wherein the final shape includes the elliptic portion.
8. The method according to claim 1, wherein the step of causing deformation in another semicircle of the substantially round formed portion to form the substantially round formed portion into a final shape, includes the step of applying pressure to the substantially round formed portion, thereby causing an inner and outer flange of the substantially round formed portion to slidingly flow in a direction toward the elliptic portion.
9. The method according to claim 8, wherein the step of applying pressure prevents a reduction of thickness of the elliptic portion in the final shape.
10. The method according to claim 1, wherein the semicircle and the another semicircle have a common center point.
11. A nacelle lip of an airplane engine, comprising:
a lip top;
an upper lip portion;
a lower lip portion;
an inner peripheral portion contiguous with the lip top;
an outer peripheral portion;
an inner edge of the inner peripheral portion; and
an outer edge of the outer peripheral portion,
wherein the upper lip portion has a shape of a part of an ellipse, and
wherein a diameter of the inner peripheral portion is greatest at the lip top and is smallest at the inner edge of the inner peripheral portion, the diameter decreasing steadily between the lip top and the inner edge.
12. The nacelle lip of an airplane engine according to claim 11, wherein an angle \u03b8u of the outer peripheral portion at the upper lip portion is greater an angle \u03b8 of the outer peripheral portion at the lower lip portion.
13. The nacelle lip of an airplane engine according to claim 11, wherein the lip top and the inner edge of the inner peripheral portion are circular in shape and parallel to each other.
14. The nacelle lip of an airplane engine according to claim 11, wherein the lower lip portion has a shape of a part of an circle.
15. The nacelle lip of an airplane engine according to claim 11, wherein the upper lip portion has a thicknesses that is not reduced as compared to thicknesses of other portions of the nacelle lip.