ERRATA AND CLARIFICATIONS Fundamentals of Vehicle Dynamics by Thomas D. Gillespie

Transcription

1 ERRATA AND CLARIFICATIONS Fundamentals of Vehicle Dynamics by Thomas D. Gillespie Page v, Acknowledgements: Typographical error on next to the last line. The fourth name is supposed to read Chuck Houser. Page 17 : Correction to Equation for FWD at bottom of the page (Subscript numeral one has been added to the h in the second term of the denominator) θ = µ c L - ζ d f L L t 1+ µ h 1 L + ζ(1+ µ h 2 L + µ d h 2 -h 3 ) L L t Page 2 : Correct Reference 17 (incorrect author s initials) to read as follows: Wong. J. Y., Theory of Ground Vehicles, John Wiley & Sons, New York, 1978, 33 p. Page 24 : Correct Figure 2.2 (Mislabeled vertical axis) % Passenger Car, 4 lb/hp a x g Typical Heavy Truck, 25 lb/hp Speed (mph) Page 27 : Add Reference 9 to the paragraph on discussion of mass factor at center of the page. The combination of the two masses is an "effective mass," and the ratio of (M + M r )/M is the "mass factor." The mass factor will depend on the operating gear, with typical values as below [9]. Ref: 9 Taborek, J. J., Mechanics of Vehicles, Towmotor Corporation, Cleveland, Ohio, 1957, 93 p.

2 Page 27: Add Reference 9 to the paragraph following the table, and correct Equation (2-12) by adding N tf in the second term. A representative number is often taken as [4,9]: Mass Factor = N tf +.25 N tf 2 Page 29 : Modifications to Figure 2.5 to clarify its interpretation. (2-12) Lockup Output/Input Torque Ratio Efficiency (%) Output/Input Speed Ratio Page 32 : Correct Figure 2.9 (Mislabeled horizontal axis) Brake Mean Effective Pressure (psi) Consumption (lb/bhp h) Wide Open Throttle Operating Schedule of Ideal Transmission Engine Speed (RPM)

3 Page 63 : Modification to Figure 3.8. The lower expression for Slope has been changed to clarify its interpretation. 2 µ p W fs 1 - µ ph/l Front Lockup 2 fpsps Deceleration Front and Rear Lockup Slope = µ ph/l 1 - µ p h/l Front Brake Force (lb) 15 5 Proportioning Line Rear Lockup 1 + Slope = - µ p h/l µ p h/l µ p Wrs 1 + µ p h/l Rear Brake Force (lb) Page 15 : Correction to Equation (5-16). The first symbol in the numerator is the Greek letter Chi (χ), not Mu (µ). Z F b /M = [χ ω 4 -(K 1 +K 2 )ω 2 ]+ j[c ω 3 ] [χω 4 -(K 1 +K 2 χ+k 2 )ω 2 +K 1 K 2 ]+ j[k 1 C ω -(1 + χ)c ω 3 ] Page 178 : Example Problem Ride rates and loads are per wheel. I.e., Front ride rate = 127 lb/in/wheel Front tire load = 957 lb/wheel Rear ride rate = 92.3 lb/in/wheel Rear tire load = 73 lb/wheel Page 25 : Correct units on Equation (6-2) are g/deg not deg/sec as shown. Page 224 : In Equation (6-65) the last of the three terms should be preceded by a minus (-) sign, rather than a plus (+) sign.

4 Page 23 : Correction to Equation (6-73) K = δ a y L V 2 (6-73) Page 233 : Correction to the equation in the middle of the page. c' = L C αf = 8.38 ft 232 = 4.55 ft C αf + C αr Page 233 : Example Problem 2, part b, correct text to read: b) If the sprung mass is 275 lb at a CG height of 1 inches above... Page 235 : Correct Reference 1 to read: Ellis, J. R., Vehicle Dynamics, Business Books Limited, London, 1969, 243 p. Page 288 : Correction to Figure 8.12 to fix mislabeled wheel loads. 2 STEERING TORQUE FROM LATERAL INCLINATION ANGLE Steering Torque (in-lb) - Left Wheel (6 lb) Right Wheel (8 lb) 1" Offset 1 Inclination Angle Total Steering Angle (deg) 3 45 Page 289 : Correct Equation (8-5) by adding minus (-) sign to the right of equals sign. ML = - (Fyl + Fyr) r tan ν (8 5)

5 Page 313 : Correction to Figure 9.2 Lateral Acceleration, a y Rollover Threshold Unstable Roll Angle, φ φ = tan -1 t 2 h Page 313 : Correction on last line of the page....equilibrium lateral acceleration reaches zero (φ = tan -1 (t/2h)). Page 317 : Correction to Figure 9.4 Lateral Acceleration, a y Rφ Rollover Threshold (lift-off of second axle) Lift-off of first axle φ = tan -1 t 2 h Roll Angle, φ