ML20137Z816

Procedure to Determine Operational Response Spectra for EMD 645 Engine

ML20137Z816
Person / Time
Site:	LaSalle
Issue date:	07/25/1980
From:	SOUTHWEST RESEARCH INSTITUTE
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ML20137Z802	List: ML20137Z795 ML20137Z810 ML20137Z816 ML20137Z827
References
PROC-800725, NUDOCS 8512110414
Download: ML20137Z816 (14)

Text

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. PROCEDURE TO DETERMINE THE OPERATIOtGJ PISPONSE SPECTRA FOR AN EMD 645 ENGINE for. -

STEWART & STEVENSON SERVICES P O BOX 1637 -

HCUSTON, TEXAS 77001 by SOUTHWEST RESEARCH INSTITUTE 6220 CULEBRA ROAD SAN ANTONIO, TEXAS 78284 (512) 684-7999

. SwRI Project 02-6073-001 July 25, 1980 l

i 8512110414 851204 PDR ADOCK 05000373 I P PDR l

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1.0 DESCRIPTION

ws Tests are to be conducted on 20-cylinder diesel engine manufactured by the

'Elucrfahotive Division of General Motors (EMD 645) attached to a generator .

The tests will determine the actual response spectra for the operating diesel generator system.

The engine is manufactured by the EMD Division of General Motors and is attached to a generator. The system is assembled by the Stewart &

Stevenson Co=pany and will be installed in a nuclear power plant to pro-vide auxiliary power.

The motor is a two-cycle, fluid cooled diesel generator developing approxi-cately 3600 horsepower. The cooling fluid maintains the engine oil at a constant te=perature during its standby condition. In 10 seconds, the engine is required to start and accept load. The engine is strated by air starters which are supplied from air accumulators mounted on a separate skid. The pri=ary function of the diesel engine is to drive a generator. '

The generator is directly coupled to the engine crankshaft. The counting brackets on the generator fra=e rest on a common subbase with the diesel engine.

2.0 PURPOSE

The purposes of this test program are:

1) To determine the respense spectra for the engine during nor=al operation, startup and shutdown.

2) To determine the essential resonant frequencies for se-lected engine components.

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3.0 OBJECTIVES

To accomplish these two purposes, three objectives are defined. These ,

objectives are: -

1) To determine the response spectra from mesurements at ,

the attachment point of the engine to the mounting frame in three mu-tually orthogonal directions during engine start-up, normal operation, and shutdown. -

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2) To determine the essential resonant frequencies for se-lected external engine components from response measurements due to an impulsive force applied or to background noise.

3) To acquire sufficient data to calculate the transfer function between the attachment po' int of the tested component on the engine and engine subframe. ,

4.0 ENGINE GENERATOR STATUS This test requires that the engine generator system be operational. The .

test data can be acquired at any time during the engine generator test consistent with Stewart & Stevenson Company test schedule. Southwest i i

Research Institute requests that it be informed of the beginning of the i test 36 hours4.166667e-4 days <br />0.01 hours <br />5.952381e-5 weeks <br />1.3698e-5 months <br /> prior to its commencement. This will permit integration of

.the Southwest Research Institute's test into Stewar't & Stevenson program.

5.0 INSTRUMENTATION .

Figure i shows the instrumentation system that will be used to acquire ,

the da ta to accomplish the identified purposes and objectives. Figure r

1 1 shows that. four channels of accelerometer instrumentation will be used. i These four channels will be recorded on a cape recorder with a frequency

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/ - 1 I 4-CllANNEL TAPE RECORDER

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SPECTRUM ANALYZER a

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SIGNAL' CONDITIONERS ,

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OSCILLOSCOPE N

FIGURE 1. INSTRUMENTATION 4

L response from DC to great'er than 100.Hz. In parallel with the data re-cording, data will be evaluated in real' time using a spectrum analyzer coupled to a plotter and an oscilloscope.

The accelerometers are required to have a frequency response from approximately .3 Hz to greater than 100 Hz.

6.0 TEST LOCATIONS Table 1 identifies the 16 planned test locations identified in Figure 2 to be measured during this test program. This table identifies that tests will be made on selected components in the diesel generator syste=. In addition, other test locations may be selected at the Stewart & Stevenson site following inspection of the diesel generator system installed in its test stand. It is anticipated that these additional tests will probably be li=ited to no more than five additional locations. Test Point No. 12 is the reference accelerometer whose'l'ocation will remain constant during the startup, steady state, and shutdown data acquisition periods. ..

7.0

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TEST PROCEDURE i .

7.1 INTRODUCTION

The data acquisition for this test program is divided into two phases, '

first, i= pulse testing and, second, an operational test. The data ac-quisition system shown in Figure 1 $s identical for both test programs.

The acceleremeters, tape recorders, spectrum analyzer, and oscilloscope

, systems will be calibrated using standard procedures.

7.2 OPERATIONAL TEST PROCEDU?lS:

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Procedures necessary to acquire data during the operational portion of the test are: .

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TABLE 1. TEST LOCATIONS

1. Generator Mounting Pads

2. At Mounting Pad of Generator

3. Top Surface of Generator

4. Flange on Exhaust Outlet

5. Exhaust Manifold

6. Oil Filter

7. Starter Mctor

8. Air Filter a

9. Lube Pump

10. On Engine.Under Valve Cover

11. Frame

12. Engine Support -(reference acceleration)

, 13. Pipe

14. Pipe

15. Frame * '

16. Cabinet A

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1) Mount a triaxial accelerometer on the engine support location identified in Figure 2. In addition, mount an accelerometer at Location No.

10 to senses acceleration in the X direction.

2) Record the acceleration signals from these four accelero- .

meter locations during start-up of the engine. After the engine has started, continue recording the four measurement locations for a minimum period of thirty minutes. After these data have been taken, record the data during the engine shutdown. These major measurement periods need not be contiguous; however, it is desirable that they be contiguous. To assure the repro'duc-ibility of the data, this s'eries of measurements, the start-up, the normal .

operation, and the shutdown are to be repeated twice. If these tests are serial, then fifteen minutes of no engine operation is to be provided be-tween test runs.

3) During steady-state data acquisition, the spectrum analyzer will be used to produce .tice-averaged, calibrated spectra from the four ac-celeremeters. The analysis frequency range is to be 100 Hz. Approximately -

five minutes of averaging is to provide. Each of the analyzed spectrum is to be plotted.

4) Reduce the triaxial accelere=eter at location 12 to a bi-axial acceler,oneter in the X-Z plane. While the engine is operating, move the re=aining two axes to the 15 measure =ent locations identified in Table 1. At each specified location, record three minutes of data.

Repeat this =easurement for the Y-Z plane.

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. 7.3 IMPULSE EXCITATION:

Data are to be recorded from each of the 16 test locations identified in Table 1. Additional test locations may be selected following in

• spectica of the motor generator system installed in'the test stand.

The procedures for conducting the i= pulse test are:

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1) At each location, install a triaxial accelerometer on the component to be measured.

Impact. and simultaneously record the response of the instrumented component for five impulses. The component is'to be

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excited by a rubber hammer.  ?

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2) Select, for each impulse measurement, a representative '

transient. For this representative transient, perform a spectrum analysis and record the~ resultant rpectrum. During each impulse, ob-

- serve a characteristic respons'e on the oscilloscope to assure that the ~

impulse does not saturate the tape recorder. If a channel on the tape '

• recorder is saturated, then repeat the test for the given location. After completion of the impulse test at one of the specified locations, move the accelerometer to the next specified location and repeat the test.

8.0 DATA REDUCTION: .

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The bulk of the data acquired for this test may be reduced at 4

the test site. The data reduction required at SwRI is the development of the response spectra during start-up, steady-state, and shutdown of  ;

6 the engine at Location No. 12 and in the X direction at location 10. l The development of the operating response spectra will be accomplished a using standard techniques.

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9.0 REPORT

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A ' report will be written to the Stewart & Stevenson Company describing the results of this test program. The report will describe the test techniques, methods of data reduction, and interpretation of the data. '

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APPENDIX 3 TAPE LOG' en 5

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, TABLE B-1. END 645 DIESEL ENGINE TEST / '

Trpe Numbsr l' .

Tape Location Test Test Tape. Accel. Time Cal. on Tape Type ~

Data No. Chan. Loc. Axis Duration- Level ft Calibration Impulse Opc ation Min V .

8-22-80 00 1-4 l 2.5 100 (All-4 channels) {

1 1-3 1 x,y-z 2.5 170 x 2 1-3 2 x,y-z 2.5 195 x e' 3 1-3 3 x,y-z 2.5 220 x

, 4 1-3 4 x,y-z 2.5 240 x 5 1-3 5 x,y-z 2.5 260 x 6 1-3 7 x,y-z 2.5 280 x-7 ,

1-3 6 -

x,y-z 2.5 300 x 8 1-3 8 x,y-z 2. 5. 320 x 9 1-3 9 x,y-z 2.5 340 x 10 1-3' 11 x',y-z 2.5 360 x -

11 1-3' 12 x,y-z 2.5 380 x

• 12 1-3 13 x,y-z 2.5 400 x i

13 1-3 14 x,y-z 2.5 420 x 14 1-3 16(I) x,y-z 2.5 440 x 15 1-3 10 x,y-z 2.5 460 x 16 1-3 15 x,y-z 2.5 480 x 17 I) 1-4 12 & x-y-z 30 2.5 502 Steady State for 30 mir 3, ,

10 x 2.5 1073 Generator Load Shutdo'1 2.5 1093 Engine Shutdown

_, 2.5 1102 Complete Engine Stop (1) Location 16 was on gage panel which was installed by S&S at plant. It is on opposite side of sketch Indication for this location. '

(2) Temperature by engine = II2*F right after first

30 min. run. 1 9

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Tape Incation Test

• Test Tapa Accel. Time Cal. . on Taps Typa 10ata No. Chan. Loc. ' Axis- Duration Level ft Calibration Impulse Operation ,,

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-22-80 18(1) 1-4 12 & x-y-z 20 130 Steady State for 20 min.

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Generator Load Shutdown 622 Engine Shutd,own 635 Complete Engine Stop 19 1,2 12 x-z 2.5 645 Steady 3 tate ,

3,4 1 x-z 3 2.5 645 Uteady State '

• , 20 3,4 2 x-z ' 3 2.5 700 Steady State 21 -

3,4 3 x-z 3 2.5 754 Steady State smd

,fcpe 22 3,4 4 x-z 3 2.5 799 ,

Steady State f 23 3,4 6 'x-z 3 2.5 850 Steady State 24 3,4 7 x-z 3 2.5 900 Steady State 25 3,4 8 x-z 3 2.5 950 Steady State

. 26 3,4 9 x-z 3 2.5 1000 Steady State i'

27 3,4 10 x-z 3 2.5 1050 Steady State .

28 3,4 11 x-z , 3. 2.5 1100 Steady State 29 3,4 13 x-z 3 2.5 1150 -

Steady State 30 3,4 14 x-z 3 2.5 1200 -

Steady State -

31 3,4 15 x-z 3 2.5 1250 Steady State -

32 3,4 16 x-z 3 2.5 1300 Steady State i 33 3,4 5 x-z 3 2.5 1350 Steady State 8Pe 9 34 3,4 1 y-z 3 2.5 1376

l,7/8 (ps Steady State 4

35 3,4 2 y-z 3 2.5 1400 Steady State 36 3,4 3 y-z 3 2.5 1425 Steady State 37 3,4 6 z-x 3 2.5 1450 Steady State

] 37A 3,4 6 y-z 3 2.5 1459 Steady State l 38 3,4 7 y-z 3 2.5 1485 Steady State 4 .

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Tape Number 2 - cont'd. .

Tape Location Test

. Test Tape Accel. Time Cal. on Tape Type Date No. Chan. Loc. Axis Duration Level ft Calibration Impulse Operation 1 Min. V 39 3,4 8 y-z 3 2.5 1510 Steady State I.0 3,4 9 y-z 3 2.5 1535 Steady State

'* 41 3,4 11 y-z 3 2.5 1560 Steady State 42 3,4 13 y-z 3 2.5 1585 Steady State 43 3,4 14 y-z 3 2.5 1610 Steady State 44 3,4 16 ' y-z 3 2.5 ,

1635 Steady State 45 3,4 10 y-z 3 2.5 1660 Steady State 46 3,4 15 y-z 3 2.5 1685 Steady State ,

End 1710 -

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1710-1715 (All 4 Channels) l (1) Temperature by engine after 2nd . -

I steady state = 117'F.

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