diff options
Diffstat (limited to '3886/CH6/EX6.15')
| -rw-r--r-- | 3886/CH6/EX6.15/6_15.sce | 14 | ||||
| -rw-r--r-- | 3886/CH6/EX6.15/6_15.txt | 5 |
2 files changed, 19 insertions, 0 deletions
diff --git a/3886/CH6/EX6.15/6_15.sce b/3886/CH6/EX6.15/6_15.sce new file mode 100644 index 000000000..7cae55cb3 --- /dev/null +++ b/3886/CH6/EX6.15/6_15.sce @@ -0,0 +1,14 @@ +//Screw jack parameters
+p=10 //mm
+d=50 //mm
+W=6000 //N
+theta=atand(p/(%pi*d)) //degree
+fi=atand(0.05) //degree
+R=300 //mm
+P=(d*W*tand(theta+fi))/(2*R) //N
+VR=(2*%pi*R)/(p)
+MA=W/P
+eta=MA*100/VR //percent
+//torque required to keep the load from descending
+T=(50*600*tand(3.6426-2.8624))/2 //N-mm
+printf("Efficiency eta=%0.2f percent > 50 percent\nThus the screw jack is not self locking\nTorque required to keep the load from descending T=%0.2f N-mm",eta,T)
diff --git a/3886/CH6/EX6.15/6_15.txt b/3886/CH6/EX6.15/6_15.txt new file mode 100644 index 000000000..cf1d0456e --- /dev/null +++ b/3886/CH6/EX6.15/6_15.txt @@ -0,0 +1,5 @@ +
+--> exec('E:\My program EM\6. Lifting machines\6.15.sce', -1)
+Efficiency eta=55.83 percent > 50 percent
+Thus the screw jack is not self locking
+Torque required to keep the load from descending T=204.27 N-mm
\ No newline at end of file |