From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Table calculating torsional vibration periods for various car engines using the 'System of Flywheels' method.
| Identifier | ExFiles\Box 137\4\ scan0005 | |
| Date | 29th March 1923 | |
| Vertical Title: TORSIONAL VIBRATION PERIODS OF CAR ENGINES CALCULATED BY "SYSTEM OF FLYWHEELS" METHOD Stamp (Top Left): ENTRY CHECKED 3 APR 1929 Top Right Corner: Tsn. 29/3/23 TABLE HEADERS (Row Labels): 14. PERIOD - R.P.M. FOR THREE CYCLES PER REV. = N x 20 13. FREQUENCY - N 12. q 11. qc LBS. FT. / RAD. 10. 1/qc = SUM OF TWO FLEXIBILITIES 9. FLEXIBILITY OF HALF OF ONE CRANK 8. FLEXIBILITY OF REAR BEARING (Unit written vertically: RADS/10^6 LBS FT.) 7. STIFFNESS OF REAR BEARING JOURNAL x10^6 LBS. FT. / RAD. 6. No. OF THROWS. 5. √C/I 4. RATIO C/I (x10^6) 3. C. STIFFNESS PER CRANK. LBS. FT. / RAD. 2. I PER CRANK (SLUGS. FT^2) 1. ENGINE. TABLE DATA: Column 1: 1-G-1 I PER CRANK: .004081 C. STIFFNESS: 117,000 RATIO C/I: 28.7 √C/I: 5,357 No. OF THROWS: 6 STIFFNESS REAR BEARING JOURNAL: 1.025 FLEXIBILITY REAR BEARING: .9759 FLEXIBILITY HALF CRANK: 4.274 1/qc: 5.250 qc: 190,500 q: 1.626 FREQUENCY - N: 218 PERIOD - R.P.M.: 4360 Column 2: STD 20H.P. I PER CRANK: .004188 C. STIFFNESS: 113,900 RATIO C/I: 27.25 √C/I: 5,220 No. OF THROWS: 6 STIFFNESS REAR BEARING JOURNAL: 1.025 FLEXIBILITY REAR BEARING: .9759 FLEXIBILITY HALF CRANK: 4.405 1/qc: 5.381 qc: 185,900 q: 1.630 FREQUENCY - N: 209 PERIOD - R.P.M.: 4180 Column 3: x PHANTOM I PER CRANK: .007087 C. STIFFNESS: 343,000 RATIO C/I: 16.72 √C/I: 4,089 No. OF THROWS: 6 STIFFNESS REAR BEARING JOURNAL: 1.820 FLEXIBILITY REAR BEARING: .5495 FLEXIBILITY HALF CRANK: 1.458 1/qc: 2.008 qc: 498,100 q: 1.450 FREQUENCY - N: 163 PERIOD - R.P.M.: 3260 Column 4: x LORRAINE. I PER CRANK: .01019 C. STIFFNESS: 176,000 RATIO C/I: 17.25 √C/I: 4,153 No. OF THROWS: 6 STIFFNESS REAR BEARING JOURNAL: 1.534 FLEXIBILITY REAR BEARING: .6530 FLEXIBILITY HALF CRANK: 2.841 1/qc: 4.714 qc: 212,100 q: 1.205 FREQUENCY - N: 164 PERIOD - R.P.M.: 3280 Column 5: STUTZ-8. I PER CRANK: .01218 C. STIFFNESS: 435,000 RATIO C/I: 35.7 √C/I: 5,975 No. OF THROWS: 8 STIFFNESS REAR BEARING JOURNAL: 2.065 FLEXIBILITY REAR BEARING: .4842 FLEXIBILITY HALF CRANK: 1.149 1/qc: 1.633 qc: 612,400 q: 1.408 FREQUENCY - N: 181 PERIOD - R.P.M.: 2710 (N x 15) | ||