1 / 100

Professional Engineering Exam Review Machinery Management

Professional Engineering Exam Review Machinery Management. Gary Roberson. Topics for Discussion. Implement performance Draft and power estimation Fuel consumption Machine capacity. Documents to Review.

falala
Download Presentation

Professional Engineering Exam Review Machinery Management

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. Professional Engineering Exam ReviewMachinery Management Gary Roberson

  2. Topics for Discussion • Implement performance • Draft and power estimation • Fuel consumption • Machine capacity

  3. Documents to Review • ASAE S296.5 (DEC2003) General Terminology for Traction of Agricultural Traction and Transport Devices and Vehicles • terminology to assist in the standardized reporting of information on traction and transport devices and vehicles.

  4. Documents to Review • ASAE S495.1 (NOV2005) Uniform Terminology for Agricultural Machinery Management • Uniform use of machinery management terms. • Definitions used in system analysis, economic analysis, and mechanical concepts.

  5. Documents to Review • ASAE EP496.3 (FEB2006)Agricultural Machinery Management • Management decisions related to machine power requirements, capacities, cost, selection and replacement

  6. Documents to Review • ASAE D497.6 (JUN2009) Agricultural Machinery Management Data • Data for use with decision tools from ASAE EP496.3

  7. Books of Interest • Machinery Management, W. Bowers, Deere and Co. • Farm Power and Machinery Management, D. Hunt, Iowa State University Press. • Engineering Principles of Agricultural Machines, A. Srivastava, et al , ASABE • Engineering Models for Agricultural Production, D. Hunt, AVI Publishing Co. • Agricultural Systems Management, R. Peart and W. Shoup, Marcel Dekker

  8. Implement Power Requirement • Drawbar power • Power developed by the drive wheels or tracks and transmitted through the hitch or drawbar to move the implement. • Power is the result of draft (force) and speed

  9. Implement Draft • D is implement draft, N (lbf) • Rsc is soil and crop resistance, N (lbf) • MR is total implement motion resistance, N (lbf)

  10. Implement Draft Where: • D=draft, N (lbf) • F=soil texture parameter • i=texture indicator: • 1=fine, 2=medium, 3=coarse • A, B, And C = machine parameters (Table 1, D497) • S=speed, km/h (mph) • W=width, m (ft) or number of tools • T=tillage depth, cm (in), • (1 for tools that are not depth specific)

  11. Implement Draft Example • A 12 foot wide chisel plow with straight points and shanks spaced 1 foot apart is used at a depth of 6 inches in medium textured soil at a speed of 5 mph.

  12. Table 1, D497.5

  13. Implement Draft Example • Chisel plow with straight points • Table 1 in D497.5 • A = 52, B = 4.9, and C = 0 • Medium soil texture • Table 1 in D497.5 • F2 = .85 • S = 5 mph • W = 12 ft or 12 tools • T = 6 in

  14. Implement Draft Example • D=Fi[A+B(S)+C(S)2]WT

  15. Implement Draft Example • D=Fi[A+B(S)+C(S)2]WT • D=0.85x[52+4.9(5)]12x6

  16. Implement Draft Example • D=Fi[A+B(S)+C(S)2]WT • D=0.85x[52+4.9(5)]12x6 • D= ?

  17. Implement Draft Example • D=Fi[A+B(S)+C(S)2]WT • D=0.85x[52+4.9(5)]12x6 • D= 4682 lbf

  18. Implement Draft Example • A 12 shank chisel plow with straight points and shanks spaced 0.3 meters apart is used at a depth of 0.15 meters in medium textured soil at a speed of 8 km/hr.

  19. Table 1, D497.5

  20. Implement Draft Example • Chisel plow with straight points • Table 1 in D497.5 • A = 91, B = 5.4, and C = 0 • Medium soil texture • Table 1 in D497.5 • F2 = .85 • S = 8 km/hr • W = 12 shanks • T = 0.15 meters = 15 cm

  21. Implement Draft Example • D=Fi[A+B(S)+C(S)2]WT

  22. Implement Draft Example • D=Fi[A+B(S)+C(S)2]WT • D=0.85x[91+5.4(8)]12x15

  23. Implement Draft Example • D=Fi[A+B(S)+C(S)2]WT • D=0.85x[91+5.4(8)]12x15 • D= ?

  24. Implement Draft Example • D=Fi[A+B(S)+C(S)2]WT • D=0.85x[91+5.4(8)]12x15 • D= 20,533 N

  25. Implement Draft Exercise • A 4 shank subsoiler with straight points is used at a depth of 16 inches in coarse textured soil at a speed of 4 mph. • What’s the Draft?

  26. Table 1, D497.5

  27. Implement Draft Exercise • A 4 shank subsoiler with straight points is used at a depth of 16 inches in coarse textured soil at a speed of 4 mph. • What’s the Draft? 4959 LB

  28. Implement Draft Exercise • A 4 shank subsoiler with straight points is used at a depth of 0.41 meters in coarse textured soil at a speed of 6.5 km/hr. • What’s the Draft?

  29. Table 1, D497.5

  30. Implement Draft Exercise • A 4 shank subsoiler with straight points is used at a depth of 0.41 meters in coarse textured soil at a speed of 6.5 km/hr. • What’s the Draft? 22,291 N

  31. Drawbar Power • Pdb = Drawbar Power, HP • D = Draft, lbf • S = Speed, mph

  32. Drawbar Power • Pdb = Drawbar Power, kW • D = Draft, kN • S = Speed, km/hr

  33. Drawbar Power Example An Implement with a draft of 8,500 lbf is operated at a net or true ground speed of 5.0 MPH with 10 percent wheel slippage. What is the implement drawbar power?

  34. Drawbar Power

  35. Drawbar Power

  36. PTO Power • PTO power is required from some implements and is delivered through the tractor PTO via a driveline to the implement. • The rotary power requirement is a function of the size and feed rate of the implement.

  37. PTO Power • Ppto = PTO power • W = implement working width, ft • F = material feed rate. t/hr

  38. Table 2, D497.5 kWh/t kW kW/m

  39. PTO Power Example • A large round baler has a capacity of 10 tons per hour. The baler has a variable bale chamber

  40. Table 2, D497.5

  41. Implement PTO Example • Variable Chamber Round Baler • Table 2 in D497.5 • A = 5.4, B = 0, and C = 1.3 • 10 t/hr capacity

  42. Implement PTO Example

  43. Implement PTO Example

  44. Implement PTO Example

  45. PTO Power Exercise • A rectangular baler has a capacity of 3 tons per hour. Bale dimensions (cross section) are 16” x 18”. • What’s the PTO power requirement?

  46. Table 2, D497.5

  47. PTO Power Exercise • A rectangular baler has a capacity of 3 tons per hour. Bale dimensions (cross section) are 16” x 18”. • What’s the PTO power requirement?

  48. PTO Power Exercise • A rectangular baler has a capacity of 3 tons per hour. Bale dimensions (cross section) are 16” x 18”. • What’s the PTO power requirement? 6.3 Hp

  49. Hydraulic Power • Fluid power requirement from the tractor for the implement • Hydraulic motors and cylinders used to drive implement functions

  50. Hydraulic Power • Phyd = fluid power, HP • P = fluid pressure, psi • F = fluid flow, gpm

More Related