BRIEF DESCRIPTION OF THE DRAWINGS
Further advantages of the invention are apparent by reference to the detailed description in conjunction with the figures, wherein elements are not to scale so as to more clearly show the details, wherein like reference numbers indicate like elements throughout the several views, and wherein:
FIG. 1 depicts a preferred embodiment of an apparatus for generating plot-on-plot displays including an interactive display system in communication with a mass storage device;
FIG. 2 depicts a view of two-dimensional primary data (RPM versus time) displayed using an interactive displayed device according to a preferred embodiment of the invention;
FIG. 3 depicts a view of primary data (RPM versus time) displayed with one selection of secondary data graphed as an orbital plot at a particular point in the primary data;
FIG. 4 depicts a view of primary data (RPM versus time) displayed with a plurality of selections of secondary data graphed as orbital plots at selected points in the primary data;
FIG. 5 depicts a view of primary data (shaft centerline plot) displayed with a plurality of selections of secondary data graphed as orbital plots at selected points in the primary data; and
FIGS. 6 and 7 depict methods for generating plot-on-plot displays according to preferred embodiments of the invention.
DETAILED DESCRIPTION
FIG. 1 depicts a preferred embodiment of an apparatus for implementing the plot-on-plot data display methods described herein. As shown in FIG. 1, the apparatus includes an interactive display device 30 which preferably includes on-board memory 32 for storing or loading data to be displayed. The on-board memory 32 may be in the form of volatile memory, non-volatile memory or a combination of both. The device 30 also includes a display screen 34 which may comprise a CRT, LCD or plasma screen, or any other similar display means known to those skilled in the art. The display device 30 may incorporate a handheld device 36 that is operable to display the primary and secondary data as described herein and to at least receive data via wireless communication. In a preferred embodiment, a separate user input device 38, such as a mouse, touchpad, touch screen or other similar input device, is in communication with the interactive display device 30. In another embodiment, a user may interact with the display device 30 directly, such as by using a touch screen, interactive voice commands or other similar direct communication means. In preferred embodiments, the interactive display device 30 interacts with a server or other device connected to local area network, wide area network, the Internet or any other communication network.
In a preferred embodiment, the interactive display device 30 is in communication with a mass storage device 40 via a communication network 42. Alternately, the mass storage device 40 may be contained within the interactive display device 30. The mass storage device 40 may be any nonvolatile data storage device in which a large quantity of data is stored, such as a magnetic or optical hard drive or a flash memory device. The communication network 42 may comprise any means of communicating data, such as a hardwired network (e.g., electrical or fiber-optic), a wireless network (e.g., infrared or RF) or a combination of hardwired and wireless networks. In the preferred embodiment, requests for data (including primary data or secondary data requests) are sent via the communication network 42 to the mass storage device 40, and the requested data is provided to the interactive display device 30 via the communication network 42.
FIG. 2 shows a first graph 2 of data displayed on the display screen 34 of the interactive display device 30. The first graph 2 shows primary data 4 plotted in a two-dimensional format. In this example, the primary data 4 is displayed as RPM versus time for a turbine during a time period in which turbine operation transitions from a lower speed state to a higher speed state and is then held at the higher speed state. The time component is measured along the X-axis 6 and the RPM component is measured along the Y-axis 8. The first graph 2 also shows a plurality of graph icons 10 from which a user can select the manner in which to plot secondary data. For example, a user may select an orbital graph icon 11 to generate an orbital plot of relative shaft position versus rotation angle. It should be understood that the methods and apparatus described herein are not limited to any particular type of graphical representation. Thus, the invention is applicable to any number of dimensions, any sources or types of data and any manner of graphically representing data.
With reference to FIGS. 1, 3 and 6, the primary data 4 is plotted in the first graph 2 on the display screen 34 of the interactive display device 30 (step 100). A user then selects a graphing format for displaying secondary data by selecting the orbital graph icon 11 from among the plurality of graph icons 10 (step 102). Subsequent or prior to the selection of the graphing format for the secondary data, the user selects a first reference point 12 on the graph of the primary data 4 (step 104). In a preferred embodiment, selection of the first reference point 12, defines a first requested data set containing secondary data. Thus, the first requested data set is a set of secondary data associated with the primary data 4 displayed at the first reference point 12. During or subsequent to the selection of the first reference point 12, a subplot 14 comprising a graphical representation of the first requested data set is superimposed on the first graph 2 (step 106). In the preferred embodiment, the format of the subplot 14 corresponds to the graph icon previously selected by the user (e.g., the orbital graph icon 11). Preferably, an indicator 16 also appears with the subplot 14 to visually associate the subplot 14 with the selected reference point 12.
With reference to FIGS. 3 and 7, another embodiment of the method is described. As in the previously described embodiment, primary data 4 is displayed (step 200) and a first reference point 12 is selected by the user (step 202). Subsequent to the selection of the first reference point, the user submits a request for secondary data of interest corresponding to the selected first reference point 12 (step 204). In situations wherein there are multiple sources of secondary data, step 204 includes submitting a request for a particular source of secondary data. The submission of the request for secondary data may be made in several different ways. In a preferred embodiment, the process of submitting the request for secondary data (step 204) includes (1) selecting a particular source of secondary data (step 204a) and (2) selecting a specific type of graphical output format to be used when displaying the requested secondary data on the interactive display device 30 (step 204b). In some embodiments, the selecting step (204a) and the submitting step (204b) may be combined into one step such that the selection of a first reference point 12 also operates as a submission of a request for secondary data corresponding to the first reference point 12 (e.g., if only one type of secondary data is available).
After the submitting the request for secondary data (step 204), the requested data set is accessed and displayed as a sub-plot 14 with the primary data 4 (step 206). The indicator 16 is preferably displayed with the subplot 14 indicating the approximate position of the reference point 12 with which the requested data set is associated. Although the indicator 16 in FIG. 3 is shown as a connecting line, it should be understood that any visual means to correlate the sub-plot 14 with the selected reference point 12 may be used, including curved lines, object indicators (such as footnote-type indicators), color code schemes and other similar indication methods known to those skilled in the art.
The reference point 12 may correspond to a single datum of primary data 4 or it may indicate a range of one of the dimensions of the primary data 4, such as a time range. Additionally, the user may select a range of the primary data 4 using a mouse or other similar selection device to click and drag a virtual enclosure (e.g., a virtual box) around a particular portion of the primary data 4, thereby defining a first reference point. In the examples shown in FIG. 3, the secondary data represents orbital data indicating the relative position of the center of rotation of a shaft of a turbine in its bearings. In these examples, the secondary data is displayed with the primary data as a subplot 14 (step 106, FIG. 6) so that a user has a static view or “snapshot” of the orbital behavior of the shaft at a time corresponding to the reference point 12 of the primary data 4. The secondary data depicted in the subplot 14 need not be static. In some preferred embodiments, the subplot 14 depicts a replay of “live” data from the period of time corresponding to the reference point 12 (such as in a repeating loop). Alternatively, the primary data 4 may also be live and the user (with a single keystroke) attaches the subplots of secondary data as the primary data develops.
In a preferred embodiment, the subplot 14 is in the form of a display window that may be repositioned within the first graph 2 (step 108a). The indicator 16 preferably associates the subplot 14 with the reference point 12 no matter where the subplot 14 is moved within the graph 2. Also, the subplot 14 may preferably be manipulated to be made more or less transparent or its relative size changed based on user interaction with the interactive display device 30. In a particular embodiment, using plot-on-plot software operating on the interactive display device 30, a fade command is selected by a user to selectively adjust the transparency of the subplot 14 on the display screen 34 to a desired level (step 108b). In another embodiment, a user manipulates a mouse or other similar device to move a screen indicator (such as a common pointer indicator) to adjust the relative size of the subplot 14 (step 108c).
With reference to FIG. 6, in some preferred embodiments, a step of loading a requested data set (step 105) is performed after the submission of a request for secondary data. This loading step may include the transfer of a requested data set from an external storage device 40 to memory 32 within the interactive display device 30. (See FIG. 1.) In another embodiment wherein secondary data is stored in digital memory 32 within the interactive display device 30, the loading step is conducted completely within the interactive display device 30. After the requested data set is loaded (step 105), the secondary data making up the requested data set is displayed on the interactive display device along with primary data (step 106).
FIG. 4 depicts an example graph 2 wherein RPM is plotted on the Y-axis 8 versus time on the X-axis 6 for the shaft of a turbine. The secondary data displayed in FIG. 4 relates to a particular position “P” along the shaft of the selected turbine monitored by at least two sensors so that accurate orbital data (i.e., the relative position of the shaft and bearings at position “P”) may be acquired. FIG. 4 depicts an example of operation of an embodiment of the invention wherein a user selects a plurality of reference points 18 (such as points 18a, 18b, 18c, 18d, 18e and 18f) on the graph of the primary data 4. The approximate locations along the primary data 4 of the selected reference points 18 are indicated by corresponding indicators 19 (such as indicators 19a, 19b, 19c, 19d, 19e and 19f). The indicators 19 correspond to subplots 20 (such as subplots 20a, 20b, 20c, 20d, 20e, and 20f). In this specific application example, a user may simultaneously obtain a display of RPM data (primary data) and orbital data (secondary data) in a user-friendly format that better communicates to the analyst the positional status of the monitored shaft at various times during turbine start-up. In preferred embodiments, different graphing formats may be selected for each of the subplots 20 of the secondary data.
After displaying the data as shown in FIG. 4 the user may remove the subplots 20 and start over by selecting a new source of secondary data. For example, the user may submit a request for secondary data corresponding to a position “Q” along the shaft that is separate and distinct from the position “P”. In addition, a user may select a graph icon other than the orbital graph icon 11 so that the newly requested secondary data is displayed with the primary data 4 in a different format. A user may also select a first reference point in the primary data 4 and request corresponding secondary data from one secondary data source (e.g., from sensors at position “P” on the shaft), and then select a second reference point in the primary data 4 and request corresponding secondary data from another secondary data source (e.g., from sensors at position “Q” on the shaft). In this way, the two different sources of secondary data can be simultaneously displayed with the graph of the primary data 4. It will be appreciated that secondary data from any conceivable combination and number of data sources could be displayed in combination with a common source of primary data. Similarly, any combination and number of graphical representations can be selected to correspond with the various requested secondary data sets, limited only by available screen space on the display screen 34 and the memory capacity of the memory 32 of the interactive display device 30. As mentioned before, the application examples shown in FIGS. 2-4 are for illustration only and are not meant to be limiting in any way.
FIG. 5 depicts a second graph 22 of primary data 24. In this illustrative example, the primary data 24 corresponds to the average centerline position of a turbine shaft relative to a fixed centerline position of the overall turbine apparatus. Although the primary data 24 gives an analyst an idea of where the average center position of the shaft is at any given time, the primary data 24 alone cannot give the analyst the necessary information to know the extent of vibration of the shaft (i.e., the extent of the radial movement of the shaft at any given point as it rotates). As in the prior embodiments a user can select a particular graphing format for the secondary data by selecting a graph icon, such as an orbital graph icon. A user may then select a first reference point 25a, thereby defining a data set including orbital data (secondary data) at a particular location along the shaft, such as point “P.” In this example, point “P” on the shaft may correspond to the location of a bearing and related sensors for gathering data. Upon selection of the first reference point 25a, an orbital subplot 26a with a corresponding indicator 28a is generated. A user can then select one or more other reference points, such as 25b and 25c, thereby initiating generation of subplots 26b and 26c with corresponding indicators 28b and 28c. The resultant display including subplots 25a, 25b and 25c gives an analyst a good indication of the movement of the shaft within its bearings at position “P” as well as the average centerline position of the shaft.
It will be appreciated that means for selecting reference points in the data and means for submitting requests for data (such as secondary data) include a combination of hardware components of the apparatus, such as the embodiment depicted in FIG. 1, as well as plot-on-plot computerware (software and/or firmware) operating on the interactive display device 30. The computerware, coupled with the interactive display device 30 allows a user to interact with the interactive display device 30 as shown in FIGS. 2-5 and as described with reference to the methods of FIGS. 6 and 7 as described herein.
The foregoing description of preferred embodiments for this invention have been presented for purposes of illustration and description. They are not intended to be exhaustive or to limit the invention to the precise form disclosed. Obvious modifications or variations are possible in light of the above teachings. The embodiments are chosen and described in an effort to provide the best illustrations of the principles of the invention and its practical application and to thereby enable one of ordinary skill in the art to utilize the invention in various embodiments and with various modifications as are suited to the particular use contemplated. All such modifications and variations are within the scope of the invention as determined by the appended claims when interpreted in accordance with the breadth to which they are fairly, legally, and equitably entitled.
Patent Application
20080007555
