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EXAMPLE.TXT
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1995-02-01
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Using HydraCyl ver. 1.2x
_______________________
E X A M P L E
_____________
We have included an example of a hypotetical design to ilustrate the
step by step procedure involved in HydraCyl.
Design specifications are:
* Cylinder Duty Heavy
* Cylinder Bore Dimension 2 inches
* Cylinder Rod Dimension 1 inch
* Cylinder Stroke 34 inches
* System Flow 25 litres/min
* Pressure 60 bar
* Attached Mass 2300 kg
* Cylinder - Valve distance 150 inches
(The length of pipes between the Cylinder's ports and the Solenoid
valve)
* Cylinder Mounting Type Intermediate trunnion
* Mounting Orientation The applied massis permanently
attached to the piston rod stud
and Cylinder rod extends and
retracts
* Spacial orientation 35 deg
* Coefficient of Friction 0.15
* Hydraulic Line Dimensions 6 mm (outside diameter)
'L' series
1. Run HC.EXE
2. Choose 'OK' on form 'About'
3. Choose 'Analysis'
4. Choose 'Perform Analysis'
You will get a message: 'Cylinder Dimensions must be specified'
5. Choose 'OK'
Let's say you want a heavy duty 2"/1" cylinder
6. Click on '( ) Heavy' in the 'Cylinder's Duty' box
7. Click on Cylinder Bore Diameter 2.00
8. Click on Cylinder Rod Diameter 1.00
9. Click on 'OK'
10. Choose 'Analysis'
11. Choose 'Perform Analysis'
You will get a message: 'Cylinder Operating Parameters must be
specified'
12. Choose 'OK'
Let's say the stroke of your cylinder is 34 inches, firstly you
need to et the correct units.
13. Choose 'Change Units'
14. Click on '( ) inch' in the 'Stroke' box
(this will be the default unit for stroke until you
change it back to 'mm')
15. Click 'OK'
Now you can enter the stroke.
16. Click in '[_ ] inch' under the 'Stroke' heading
17. Type 43 (OOPS my typing mistake, should be 34)
18. Click on 'Clear Values'
19. Click on 'Stroke'
20. Type 34 (correct value)
Let's say the system flow is 25 lit/min
21. Click in '[_ ] lit/min' next to the 'System Flow' heading
22. Type 25
Let's say the Pressure is 60 bar
23. Click in '[_ ] bar' next to 'Pressure'
(if it is required change units to 'bar' in the simmilar
maner as stroke.)
24. Type 60
Let's say the attached mass is 2300 kg
25. Click in '[_ ] kg' next to 'Applied Mass'
26. Type 2300
Let's say the pipeline length between Cylinder's ports and solenoid
valve is 150 inches
27. Click in '[_ ] inch' next to 'Cyl-Valve distance'
28. Type 150
29. Click 'OK'
30. Choose 'Analysis'
31. Choose 'Perform Analysis'
You will get a message: 'Cylinder Mounting Type must be specified'
32. Choose 'OK'
Let's say the cylinder mounting type is 'Intermediate trunnion'
33. Click on 'View Basic Mount Types (a - p)'
34. High resolution picture is shown of all possible mounting
types. Look for Intermediate trunnion. It is marked by 'b'
35. Press any key to get out of diagram.
36. Click on 'b0'
37. Click 'OK'
38. Choose 'Analysis'
39. Choose 'Perform Analysis'
You will get a message: 'Cylinder Mounting Orientation Must be
specified'
40. Choose 'OK'
Let's say a mass of 2300kg is permanently attached (cylinder rod
extending and retracting) to cylinder. Cylinder is mounted under 35
degrees slope, and mass is attached to Piston Rod Stud. Friction
coefficient is 0.15.
41. Click on 'View Orientation Diagrams'
42. High resolution picture is shown of all mounting orientation
types. Look for above description. It is marked as '3'
43. Press any key to get out of diagram.
44. Click on '3'
45. Click in '[_ ]' next to 'Angle between OX and OZ axis'
46. Type 35
47. Click in '[_ ] kg' next to 'Coefficient of friction'
48. Type 0.15
49. Click 'OK'
50. Choose 'Analysis'
51. Choose 'Perform Analysis'
You will get a message: Hydraulic Line Dimensions must be specified
52. Choose 'OK'
Let's say that Hudraulic line between Cylinder port's and Solenoid
valve are 6mm outside diameter and 'L' series.
53. Choose 'Metric'
54. Click on Outside Diameter Size 6
55. Click on Series L
56. Click on 'OK'
57. Choose 'Analysis'
58. Choose 'Perform Analysis'
You will get a message: 'Calculation Complete'
(this means that all relevant data has been entered and now you will
see the results of HydraCyl's analysis)
59. Choose 'OK'
You get a Warning: SUPPPLY PRESSURE Required pressure for Cylinder's extending is low, consult Page 5.
60. Observe top left corner of the screen. There is title:
Cylinder Data - Page 4 of 5.
61. Choose 'Page Down'
62. Observe Min.Total Pressure Rod Extending = 87.00 bar
Now we will make changes to our specifications to try to
overcome this design problem.
63. Choose 'Cylinder' (on top left hand side of screen)
64. Choose 'Operating Parameters'
65. Change 'Supply pressure to 90 bar.
66. Click 'OK'
67. Choose 'Analysis'
68. Choose 'Perform Analysis'
69. Choose 'OK'
You will get a Warning: ROD BUCKLING Rod is buckling. Select larger
cylinder or use other engineering methods.
Consult pages 2 and 3.
70. Observe top left corner of the screen. There is title:
Cylinder Data - Page 4 of 5.
71. Choose 'Page Up'
72. Browse pages until you get page 2 on the screen.
73. Play between pages 2 and 3 and observe values of:
(page 2) Extending Force = 1824 daN
(page 3) Column Strength = 585 daN
Obviously that actual extending (static) force is almost 4 times
higher than Piston Column strength. Now we will make some changes to
our specifications to try to overcome this design problem.
74. Choose 'Cylinder' (on top left hand side of screen)
75. Choose 'Dimensions'
76. Click on Cylinder Rod diameter 1.375".
(we have just changed cylinder rod diameter from 1" to 1.375" to
try to eliminate buckling effects)
77. Click 'OK'
78. Choose 'Analysis'
79. Choose 'Perform Analysis'
80. Wait until you get a message 'Calculation complete'
81. Choose 'OK'
At last NO Warnings. That means all parameters are acceptable and
properly entered. You have selected a suitable cylinder.
Let's look at the analysis results. Use 'Page Up' and 'Page Down' to
browse the inputs and results on the 'Cylinder Data' form, they are as
follows:
Dimensions:
Bore Diameter 2.00 inch (This is the cylinder
Rod Diameter 1.375 inch size you have now selected
Stroke 34.00 inch for your application)
Hydr.Line Dimensions:
Pipe (Tube) Diameter 6 L
Cyl-Valve Distance 150.00 inch
Mounting:
Duty Heavy
Type b0 Intermediate trunnion
Orientation 3 Fixed Cylinder Body. Piston Rod retracting and
extending. Load attached to Piston Rod Stud.
Cylinder's Slope 35.00 deg
Friction Coefficient 0.15
Operating Parameters:
System Flow 25.00 lit/min
Extending Speed 205.58 mm/sec
Extending Time 4.20 sec
Retracting Speed 389.83 mm/sec
R