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添付資料 24
Draft Minutes of Minden NV Meeting
ISO TCI08 SC1 JWG1
1) Meeting was Opened at 0930 with Six Members Present
Roll Call was completed
No New Addenda Added
2) Problem Communication Documents
a) General coordination Dieter will be JWG Secretary. For official voting documents, Dieter will distribute for ISO and Arnesau will be Secretary for IEC.
b) With coordination with any documents Dieter has issued, Crahan will issue 'N-xxx" numbers to all documents to-date and re-issue to JWG.
3) Coordination of JWG member database
Mr. Olsson mentioned that some Swedish colleagues known by him to have participated in ISO 7919-5 have not been included in documents distributed since Berlin meeting. Crahan and Hansen will review JWG membership address/contact information and issue an "accurate list".
4) Problem electronic document distribution
Dieter Hansen asked that the JWG establish "electronic document exchange" protocol. He mentioned that there were problems "opening files". Details of the protocol have to be worked out.
5) Review of Old Business
a) Coordination of 7919-5 with 10816-5.
This coordination of 7919-5 with 10816-5 has to occur. For practical considerations, the JWG decided to organize this coordination in the following manner:
Revise 7919-5 asap
Issue addenda to 10816-5 so it conforms to the revised 7919-5 asap.
Petition ISO/IEC for New Document "Integrated 7919-5 with 10816-5"
c) |
We need to create a new machinery vibration database in accordance with the normalization of variables suggested by Anders and Norway. See Proposal issued by Thomas. |
d) |
A review of ISO/IEC database indicates several vulnerabilities so that conclusions made in the past may not be defended by the data. |
e) Factors for Vertical/Horizontal?
The existing database is for vertical shaft orientation hydraulic machines. The shaft relative vibration for vertical shaft machines in good operating condition will generally be larger than shaft relative vibration for horizontal shaft machine in good condition. Future versions of the database will address the shaft orientation.
f) The "Manwani analysis" of database appears to be incomplete.
g) We need to contact Japan and ask them to defend the "multiplicative factors".
h) We agreed in principal to implement the suggested changes proposed by the Germans. Main features are
a) New definitions for zone/ranges
b) Change line type in A1/A2 graphs with heavy line for boarder between B/C. Then have dashed lines between A/B and C/D.
c) Introduce a new annex "C" which will explain statistical analysis acc German proposal.
d) The limiting values are applicable for all kinds of turbine-driven machine sets independent of the type, head and power in steady state condition. The steady state condition is normally defined by the flow range from (0.8 * Qpeak η) to Qmax at measurement evaluation head.
i) New Range Definitions
Range A-B
Machines with vibrations in these ranges are considered to have acceptable vibrations for reliable, long term operation.
Range C-D
Machines in these ranges have high vibration magnitudes. It is in each case necessary to check if the measured values are permissible for long term continuous operation considering the specific design and operating conditions. In all cases evaluation should be made comparing the shaft relative vibrations relative to the bearing running diametrical clearance, and oil film thickness.
Footnote Range C
Heavy Solid Line at 92.5% cumulative probability distribution
Range A Definition
The machine sets with vibration magnitudes within this range (coupled with low shaft eccentricities) are likely to be in a very low mass, hydraulic and electromagnetic unbalance, high quality mechanical alignment, journal roundness, and good operating conditions. Footnote dashed line represent 50% cumulative probability distribution ISO database
Range D Definition
Machines with vibrations within this range would ordinarily be shut down for evaluation purposes.
Footnote: Dashed line = 98% cumulative probability distribution ISO database.
7) |
The JWG concluded there is a need to create an improved format for the vibration database. |
| Integrate Norway, Sweden, IEC/ISO databases into an integrated db with new fields |
1 July '02 |
| Issue new database key field format (from 1st meeting) |
1 July '02 |
| JWG committee approval of new format in 3rd Meeting |
1 Nov.'02 |
| Issue a formal request for data to National Committee ISO/IEC |
1 Jan '03 |
| Issue reminder to complete data |
1 Jan '04 |
| Receipt of data from NC |
1 June '04 |
8) Proposed JWG Timeline
| Release minutes of meeting |
15th May.'02 |
| Create a first draft for Minden group review |
1 June,'02 |
| Receive comments from Minden group |
15 June,'02 |
| Create a "first committee review" (non voting) |
1 July,'02 |
| Comments to "first committee draft" |
15 Oct.'02 |
| JWG 3rd meeting to reconcile comments in Europe |
1 Nov.,'02 |
9) |
Anders Bard will release a revised Swedish document which includes the graphs that he presented to the JWG from his technical analysis of the Norwegian database. |
10) |
Slope of the vibration limit lines
First for fatigue purposes vibration velocity is the important factor. It is impractical to measure shaft velocity. For constant velocity (kinetic energy) displacement must decrease over the range of shaft rotational frequency.
Secondly, the slope of the limit lines will be determined by the statistics derived from existing database. |
11) Proposed new graph format
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