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Fig. 18. Simulated Driver-Vehicle Response Using the Dynamic Crosswind Model - Gauntlet Course Example.

Figure 18 Simulated Driver-Vehicle Response Using the Dynamic Crosswind Model - Gauntlet Course Example.

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Fig. 1, Key Elements in Vehicle Crosswind Stability. research program, is then briefly described. The use of that model at different stages of the research helped to id nisms identified as possibly significant contributors to the issue of crosswind sensitivity. As will be seen, behavior patterns, observed in he ex tems operating in crosswinds, is tool within the vehicle design entify and probe certain vehicle-related mecha- ability of the model to predict basic dynamic perimental measurements of driver-vehicle sys- an important factor for recommending it as a process. The basis of the conclusions of this paper, however, rest upon experimenta seven test drivers operating seven distinctly different vehicle configurations dur- measurements and evaluations of a group of ing nearly identical crosswind conditions. The crosswind tests were conducted using a set of eight fans (arranged in an alternating direction over a length of several hundred feet) to approximate a random-like crosswind "gauntlet" driven repeatedly by each driver. On-board measurements of the driver-vehicle responses. combined with the subjective evaluations of the test drivers during these tests, form the basis of the paper's conclusions.
Fig. 1, Key Elements in Vehicle Crosswind Stability. research program, is then briefly described. The use of that model at different stages of the research helped to id nisms identified as possibly significant contributors to the issue of crosswind sensitivity. As will be seen, behavior patterns, observed in he ex tems operating in crosswinds, is tool within the vehicle design entify and probe certain vehicle-related mecha- ability of the model to predict basic dynamic perimental measurements of driver-vehicle sys- an important factor for recommending it as a process. The basis of the conclusions of this paper, however, rest upon experimenta seven test drivers operating seven distinctly different vehicle configurations dur- measurements and evaluations of a group of ing nearly identical crosswind conditions. The crosswind tests were conducted using a set of eight fans (arranged in an alternating direction over a length of several hundred feet) to approximate a random-like crosswind "gauntlet" driven repeatedly by each driver. On-board measurements of the driver-vehicle responses. combined with the subjective evaluations of the test drivers during these tests, form the basis of the paper's conclusions.
tunnel data collected under this work is analogous to traditional, previously published passenger car aerodynamic data, such as seen in Hogue [25].
tunnel data collected under this work is analogous to traditional, previously published passenger car aerodynamic data, such as seen in Hogue [25].
Fig. 3. Steering System Model.
Fig. 3. Steering System Model.
Fig. 4. Steering System Measurementsand Model Predictons.
Fig. 4. Steering System Measurementsand Model Predictons.
Table 1. Vehicle Configurations Examined in Test Program.
Table 1. Vehicle Configurations Examined in Test Program.
CROSSWIND SENSITIVITY OF PASSENGER CARS AND DRIVER PREFERENCES 213 Fig. 5. Description of Test Vehicle Configurations.
CROSSWIND SENSITIVITY OF PASSENGER CARS AND DRIVER PREFERENCES 213 Fig. 5. Description of Test Vehicle Configurations.
Table 2. Aerodynamic Wind Tunnel Data.
Table 2. Aerodynamic Wind Tunnel Data.
Fig. 6. Crosswind Pulse, Fixed Steering Wheel Test.
Fig. 6. Crosswind Pulse, Fixed Steering Wheel Test.
Fig. 9. Example Measurementsof Vehicle Response Due to Pulse of Fan-Generated Crosswind. CP Influence. 25 mph Fan-Generated Crosswind
Fig. 9. Example Measurementsof Vehicle Response Due to Pulse of Fan-Generated Crosswind. CP Influence. 25 mph Fan-Generated Crosswind
Fig. 10. Example Measurements of Vehicle Response Due to Pulse of Fan-Generated Crosswind Load Influence. 25 mph Fan-Generated Crosswind
Fig. 10. Example Measurements of Vehicle Response Due to Pulse of Fan-Generated Crosswind Load Influence. 25 mph Fan-Generated Crosswind
Fig. 12. Example Yaw Rate Measurements from the Crosswind Gauntlet Course. In Figure 12, an overlay of three yaw rate responses (not synchronized in time) are seen to illustrate the degree of variation routinely observed from the
Fig. 12. Example Yaw Rate Measurements from the Crosswind Gauntlet Course. In Figure 12, an overlay of three yaw rate responses (not synchronized in time) are seen to illustrate the degree of variation routinely observed from the
Fig. 13. Subjective Ratings from 7 Drivers - Crosswind Gauntlet Course.
Fig. 13. Subjective Ratings from 7 Drivers - Crosswind Gauntlet Course.
Table 3. Normalized RMS Responses from the Crosswind Gauntlet Tests.
Table 3. Normalized RMS Responses from the Crosswind Gauntlet Tests.
‘able 4. Rankings of the Response Variables by Degree of Correlation with Driver Subjective Rat: ings.
‘able 4. Rankings of the Response Variables by Degree of Correlation with Driver Subjective Rat: ings.
Fig. 15. Correlation Between Subjective Ratings and the Steady-State Yaw Rate Response due toa Constant Crosswind.
Fig. 15. Correlation Between Subjective Ratings and the Steady-State Yaw Rate Response due toa Constant Crosswind.
Fig. 17. Crosswind Profile Used in Example Calculations of Figure 18.
Fig. 17. Crosswind Profile Used in Example Calculations of Figure 18.
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