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From page 133... ... C-1 APPENDIX C TURNING PERFORMANCE ANALYSIS OF SPECIFIC DESIGN VEHICLES One of the overall objectives of the research is to recommend appropriate changes to the design vehicles in the 2001 Green Book (1) and recommend vehicles for consideration as future design vehicles. Read the entire page →
From page 134... ... input as the steering angle for the respective proposed new design vehicles. The basis for selecting a value for an input parameter such as the maximum steering angle is significant because, in particular, this parameter impacts the minimum turning radius of a vehicle. Read the entire page →
From page 135... ... of the proposed design vehicles is a double trailer combination with two 16.15 m [53 ft] trailers. Read the entire page →
From page 136... ... C-4 Centerline of Steering Axle Centerline of Drive Axle Maximum Steering Angle Maximum Steering Angle Turning Radius Ef fe ct iv e W he el ba se o f T ra ct o r Centerline Turning Radius = Effective Wheelbase Sin (Max. Steering Angle) Read the entire page →
From page 137... ... Tractor Width: 8.00 ft Tractor Track: 8.00 ft Trailer Width: 8.50 ft Trailer Track: 8.50 ft Steering Angle: 28.40 Articulating Angle: 75.00 ° ° Figure C-7. Read the entire page →
From page 138... ... C-6 Tractor Width: 8.00 ft Tractor Track: 8.00 ft Trailer Width: 8.50 ft Trailer Track: 8.50 ft Steering Angle: 28.40 Articulating Angle: 75.00 ° ° Figure C-9. Read the entire page →
From page 139... ... C-7 Tractor Width: 8.00 ft Tractor Track: 8.00 ft Trailer Width: 8.50 ft Trailer Track: 8.50 ft Steering Angle: 15.60 Articulating Angle: 70.00 ° ° Figure C-11. Read the entire page →
From page 140... ... rear of the trailer. It has a minimum centerline turning radius of 23.8 m [78.0 ft] Read the entire page →
From page 141... ... C-9 Design Vehicles Width and Track of Tractor (A) Width and Track of Trailer (B) Read the entire page →
From page 142... ... Single Unit Vehicles • The minimum turning radius of the proposed single unit design vehicle is 2.9 m [9.5 ft] greater than the minimum turning radius of the single unit design vehicle in the 2001 Green Book. Read the entire page →
From page 143... ... proposed single unit design vehicle has greater offtracking and a wider swept path width than the single unit design vehicle in the 2001 Green Book. Tractor-Semitrailers • The minimum turning radius of the proposed WB-22 [WB-71] Read the entire page →
From page 144... ... Although the minimum turning radii for all the tractorsemitrailers are approximately equivalent, the longer wheelbases of the WB-20 [WB-67] Read the entire page →
From page 145... ... C-13 Figure C-18. Minimum 180º turn: WB-23D [WB-77D] Read the entire page →
From page 146... ... Estimating Maximum Offtracking Offtracking is defined as the radial offset between the path of the centerline of the front axle of the tractor and the path of the centerline of the rearmost trailer axle set. There are two types of offtracking, referred to as low-speed and high-speed offtracking. Read the entire page →
From page 147... ... by bringing the AutoTURN plot into AutoCAD and scaling the appropriate distances. The largest radial distance between the two paths (that of the center of the front axle and that of the inside rear axle set) Read the entire page →
From page 148... ... Estimating Maximum Swept Path Width Swept path width is defined as the radial distance between the two paths of the outside front tractor tire and the inside rear axle set of the trailer. Conceptually, the maximum swept path width of a vehicle negotiating a turn occurs at the same location as the maximum offtracking. Read the entire page →
From page 149... ... C-17 the path of the rear axle set. This rear swingout is a function of the trailer wheelbases, the radius of the turn, and other dimensions of the vehicle. Read the entire page →
From page 150... ... C-18 Figure C-22. Sample offtracking estimates. Read the entire page →
From page 151... ... Figure C-23. Sample rear swingout estimates. Read the entire page →
From page 152... ... C-20 TABLE C-4 Turning capabilities of selected tractor-semitrailer combinations Design vehicle Proposed design vehicle 2001 Green Book Turning capabilities WB-67 WB-67 (41 ft KCRT) Read the entire page →

From page 133...

... C-1 APPENDIX C TURNING PERFORMANCE ANALYSIS OF SPECIFIC DESIGN VEHICLES One of the overall objectives of the research is to recommend appropriate changes to the design vehicles in the 2001 Green Book (1) and recommend vehicles for consideration as future design vehicles.