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Diffstat (limited to '698/CH26/EX26.8/8_punching_power.txt')
| -rw-r--r-- | 698/CH26/EX26.8/8_punching_power.txt | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/698/CH26/EX26.8/8_punching_power.txt b/698/CH26/EX26.8/8_punching_power.txt new file mode 100644 index 000000000..edd0bb912 --- /dev/null +++ b/698/CH26/EX26.8/8_punching_power.txt @@ -0,0 +1,15 @@ +(a)For punching operation, requirement of power:
+Maximum shear force=Sut*Area =471238.9 N
+Energy required per stroke=4712.389 Nm
+Total energy required per minute=117809.72 Nm
+Power of Motor=2181.66 W
+
+(b)Energy stored in flywheel:
+ =4241.15 Nm
+Out of this,5% is supplied by arms and hub, and 95% by rim
+ mr=185.791 kg
+
+(c)mr=pi*Dm*t*b*rho
+For rectangular rim, b=2t=0.114 m and t=0.057 m
+Checking for stresses,
+St=rho*V^2=1.57Mpa, which is less than 6Mpa, hence safe.
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