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| author | priyanka | 2015-06-24 15:03:17 +0530 |
|---|---|---|
| committer | priyanka | 2015-06-24 15:03:17 +0530 |
| commit | b1f5c3f8d6671b4331cef1dcebdf63b7a43a3a2b (patch) | |
| tree | ab291cffc65280e58ac82470ba63fbcca7805165 /764/CH6/EX6.7.b | |
| download | Scilab-TBC-Uploads-b1f5c3f8d6671b4331cef1dcebdf63b7a43a3a2b.tar.gz Scilab-TBC-Uploads-b1f5c3f8d6671b4331cef1dcebdf63b7a43a3a2b.tar.bz2 Scilab-TBC-Uploads-b1f5c3f8d6671b4331cef1dcebdf63b7a43a3a2b.zip | |
initial commit / add all books
Diffstat (limited to '764/CH6/EX6.7.b')
| -rwxr-xr-x | 764/CH6/EX6.7.b/result6_7.txt | 56 | ||||
| -rwxr-xr-x | 764/CH6/EX6.7.b/solution6_7.sce | 32 |
2 files changed, 88 insertions, 0 deletions
diff --git a/764/CH6/EX6.7.b/result6_7.txt b/764/CH6/EX6.7.b/result6_7.txt new file mode 100755 index 000000000..b92ae125b --- /dev/null +++ b/764/CH6/EX6.7.b/result6_7.txt @@ -0,0 +1,56 @@ +-->//(Power Screws) Example 6.7
+
+-->//Speed of the tool holder v (m/min)
+
+-->v = 5
+ v =
+
+ 5.
+
+-->//Number of starts of the screw n
+
+-->n = 1
+ n =
+
+ 1.
+
+-->//Nominal diameter of the screw d (mm)
+
+-->d = 48
+ d =
+
+ 48.
+
+-->//Pitch of the screw p (mm)
+
+-->p = 8
+ p =
+
+ 8.
+
+-->//Force exerted by operating nut W (N)
+
+-->W = 500
+ W =
+
+ 500.
+
+-->//Mean radius of the friction collar rm (mm)
+
+-->rm = 40
+ rm =
+
+ 40.
+
+-->//Coefficient of friction at thread and collar surfaces mu
+
+-->mu = 0.15
+ mu =
+
+ 0.15
+
+
+The power required to drive the screw(kW) = 0.347319 kW
+
+Efficiency of the mechanism(eta) = 11.996655 percent
+
\ No newline at end of file diff --git a/764/CH6/EX6.7.b/solution6_7.sce b/764/CH6/EX6.7.b/solution6_7.sce new file mode 100755 index 000000000..ecc077336 --- /dev/null +++ b/764/CH6/EX6.7.b/solution6_7.sce @@ -0,0 +1,32 @@ +
+//Obtain path of solution file
+path = get_absolute_file_path('solution6_7.sce')
+//Obtain path of data file
+datapath = path + filesep() + 'data6_7.sci'
+//Clear all
+clc
+//Execute the data file
+exec(datapath)
+//Calculate lead of the screw l (mm)
+l = n * p
+//Calculate the mean diameter of the screw dm (mm)
+dm = d - (0.5 * p)
+//Calculate the lead angle alpha (degree)
+alpha = atand(l/(%pi * dm))
+//Calculate the angle of repose fi (degree)
+fi = atand(mu)
+//Calculate the torque required Mt (N-mm)
+Mt = (W * dm * tand(fi + alpha))/2
+//Calculate the torque applied to overcome the friction at collar surface Mtc (N-mm)
+Mtc = (mu * W * rm)
+//Calculate the total external torque required MTotal (N-mm)
+MTotal = Mt + Mtc
+//Calculate the rpm of the screw N
+N = (v * 1000)/p
+//Calculate the power required to drive the screw kW
+kW = (2 * %pi * N * MTotal)/(60 * (10^6))
+//Calculate the efficiency of the mechanism eta (%)
+eta = ((W * l)/(2 * %pi * MTotal))*100
+//Print results
+printf('\nThe power required to drive the screw(kW) = %f kW\n',kW)
+printf('\nEfficiency of the mechanism(eta) = %f percent\n',eta)
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