Rather than interfacing directly with the common data storage at SQL level, third party applications gains access through a data export interface. The data export interface is an ActiveX component allowing third party application to programmatically enumerate the objects within the common storage
and
extract
the
underlying
data
(Fig.
4.4).
It
has
also
a
GUI
allowing
the extraction of data into applications which do not have their own GUI for data object management. Further, the data export interface o.ers a mecha-nism for connecting directly to a ground station data reservoir through the common interface layer. This is especially convenient in support situations, as it allows HUMS OEM support personnel to tap directly into an operator’s ground station using specialist data analysis tools.
4.5 Discrepancy Reporting
Historical HUMS data is of little use if the states of the assets corresponding to the data recordings are not known. In order to extract any knowledge about the correlation between mechanical states and vibration signatures, both the states and their corresponding signatures must be known. In the context of pattern recognition, this is known as marked training sets. In order to have the historical HUMS data from an aircraft correctly marked, it is necessary to know when the operator experienced mechanical problems, as well as the nature of the problems.
This has led to the development of a discrepancy reporting system. The discrepancy reporting system allows operators to .le a report online when ever an anomaly is suspected. Any such report will be handled by an expert at the HUMS OEM advising the operator of the appropriate action. This is a two-way communication process where the operator and the HUMS expert work together to locate the origin of the problem (Fig. 4.5).
Once the problem is identi.ed and the appropriate actions taken, the HUMS expert will set a marker in the common storage database explaining the uncovered anomaly, if any. This marker will be stored for future reference with all communication made during the fault isolation process.
Discrepancy reporting procedures already exists in some form or another for most HUMS OEMs. The advantage of the online reporting system is that it cuts response time for the support personnel signi.cantly. Further, it provides automatic logging of discrepancy reports, facilitating statistical studies and correlation with HUMS data. This combination of a HUMS data storage facility and a discrepancy database allows researchers and support personnel to extract and investigate the vibration signatures corresponding to speci.c mechanical problems through the click of a button. When managing data from an entire .eet of aircraft, each aircraft producing hundreds of condition indicators for thousands of hours every year, it is essential to have data management at this level in order to keep oversight. 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：OPTIMIZATION OF FAULT DIAGNOSIS IN HELICOPTER HEALTH AND USA(37)
