 System for electronic barter, trading and redeeming points accumulated in frequent use reward programs |
| OF THE PREFERRED EMBODIMENT With reference to FIG. 4, a plurality of reward server computers 10, 12... |
|
| Computer aided real-time decision support system and method |
| It is an object of the present invention to provide a method and system having a nature of ... |
|
| Method and system for selling and purchasing media advertising over a distributed communication network |
| The present invention provides a solution to the problems and shortcomings in the art as described ... |
|
| Multi-media information record device, and a multi-media information playback device |
| It is an object of the present invention to provide a multi-media information playback device, in ... |
|
| Customer billing relationships software |
| OF THE INVENTION The present invention is a Customer Billing Relationships accounting software ... |
|
| Electronic game system |
| Embodiment of the invention, described below, permit a user on a connected device to interact with ... |
|
| Method for knowledge management |
| The present invention provides a method of creating sustainable knowledge management practices by ... |
|
|
Startup and operational techniques for a digital flowmeter
| Details |
Inventors: Henry, Manus P.; Zamora, Mayela E.;
Assignee: Invensys Systems, Inc. (Foxboro, MA)
Primary Examiner: Barlow; John
Assistant Examiner: Le; John
Attorney, Agent or Firm: Fish & Richardson P.C.
Startup and operational techniques for a digital flowmeter are described. The techniques select an optimal mode of operation for the digital flowmeter, depending on a current environment of the flowmeter. For example, during a startup operation of the flowmeter, the mode of operation might include a random sequence mode, in which filtered, random frequencies are applied as a drive signal to a flowtube associated with the digital flowmeter. Once the flowtube reaches a resonant mode of vibration, the digital flowmeter may transition to a positive feedback mode, in which a sensor signal representing a motion of the flowtube is fed back to the flowtube as a drive signal, as part of a feedback loop. Once an oscillation of the flowtube is achieved and analyzed, a digital synthesis mode of operation may be implemented, in which the analyzed sensor signals are used to synthesize the drive signal. In either the positive feedback mode or the digital synthesis mode, the digital flowmeter may revert to a previous mode to regain stable and desired oscillation of the flowtube, such as might be required during a recovery operation associated with a disturbance to an operation of the digital flowmeter. |
|
DETAILED DESCRIPTION FIG 1A is an illustration of a digital flowmeter using a bent flowtube 102.
Specifically, the bent flowtube 102 may be used to measure one or more physical characteristics of, for example, a (traveling) fluid, as referred to above.
A detailed description of a structure and operation(s) of the bent flowtube 102 is provided in, for example, commonly-assigned U.
S.
Pat.
No.
6,311,136.
Flowtubes which are similar in concept to the bent flowtube 102 are also discussed in, for example, U.
S.
Pat.
No.
6,327,914 B1, which is incorporated by reference in its entirety.
In FIG.
1A, a digital transmitter 104 exchanges sensor and drive signals with the bent flowtube 102, so as to both sense an oscillation of the bent flowtube 102, and to drive the oscillation of the bent flowtube 102 accordingly.
By quickly and accurately determining the sensor and drive signals, the digital transmitter 104, as referred to above, provides for fast and accurate operation of the bent flowtube 102.
More specifically, the digital transmitter 104 serves to select signal characteristics such as a frequency, phase, and amplitude of the drive signals, in order to obtain a desired oscillation of the bent flowtube 102, e.
g.
, an oscillation which aligns these signal characteristics of the sensor and drive signals with one another, at a natural resonant frequency of the bent flowtube 102.
For example, the digital transmitter 104 may generate the drive signals by applying the sensor signals (perhaps with suitable adjustments) as the drive signals, as part of a feedback loop.
As another example, the digital transmitter 104 may generate the drive signals by synthesizing a new signal having the desired characteristics.
FIG.
1B is an illustration of a digital flowmeter using a straight flowtube 106.
More specifically, in FIG.
1B, the straight flowtube 106 interacts with the digital transmitter 104 to produce, for example, density and/or mass flow measurements.
Such a straight flowtube operates similarly to the bent flowtube 102 on a conceptual level, and has various advantages/disadvantages relative to the bent flowtube 102
|
|
Finance 
