By JOHN DELLA CONTRADA Contributing Editor
To prevent your car from spinning out on an icy roadway, is it
better to turn the steering wheel toward or away from
the direction of a skid?
UB mechanical engineers—using a virtual-reality driving simulator
and human subjects—are addressing this annual winter-weather
question and are developing new technologies that one day may help
drivers proceed safely in bad weather.
|
Tarunraj Singh sits at the virtual-reality
driving simulator PHOTO: Donna
Longenecker |
Honda Corporation and Veridian have funded their research.
"The goal is to create tools and strategies that enhance the
ability of a driver to cope with inclement conditions," says
Tarunraj Singh, associate professor of mechanical and aerospace
engineering. "Technology can supplement the natural instincts of
drivers, helping them take corrective action and stabilize their
cars in worst-case scenarios."
Singh points out that many drivers instinctively know that
turning the steering wheel toward a skid can help prevent a spinout,
but the real trick to stabilizing a car is knowing how much and how
fast to turn the wheel and when to turn the wheel back. The car's
speed, road conditions, the type of tires used and the car's weight
are important factors when stabilizing a skidding car.
It's nearly impossible for drivers to know how to react safely in
every situation, given all these variables, Singh says.
That's where technology can help.
In UB's Virtual Reality Laboratory, drivers at the wheel of the
simulator are confronted with various driving conditions that,
together or alone, might lead to a spinout, such as icy roads, poor
visibility, inappropriate speed and locked brakes. A controller
developed by Singh and fellow researchers monitors the vehicle's
slip angle (which factors the direction of the steering wheel and
the direction angle of the car), as well as the driver's reactions
to various driving conditions.
As drivers within the simulator are confronted with spinout
conditions, they are provided cues that guide their maneuvers and
help them to stabilize their "car." These cues-in the form of audio
tones and blinking lights-instruct the driver on how quickly to turn
the wheel and in which direction.
According to Singh, the audio cues were particularly effective in
helping drivers stabilize the car, even in the most severe driving
conditions.
"With the audio cues, every driver we tested was able to
stabilize the car with no problem," says Singh. "The visual cues
proved less effective, possibly because the driver was overloaded
with other visual cues from the roadway and dashboard."
Based on the results, Singh and his co-researchers are
considering whether cars could be equipped with alarms that alert
and guide drivers when their car is in danger of spinning out. And
the researchers soon will begin testing the effectiveness of tactile
cues, such as a vibrating steering wheel, which would tell drivers
what direction to turn the wheel to stabilize their car.
"Tactile cues may be more effective than audio cues, and they
also may be more acceptable to the driver," Singh says. "Many
drivers would be embarrassed if an alarm sounded while they're
driving—especially if they have a passenger with them," Singh
explains. "The implication would be that they're a bad driver
because they put the car in a dangerous situation.
"It's very important to consider human factors when testing the
effectiveness of these technologies," Singh adds.
In addition to testing the viability of tactile cues, Singh and
his fellow researchers plan to use the virtual-reality driving
simulator to test the dangers of cell-phone use while driving and
they are working on a driver-education system to prepare new drivers
for the perils of driving in inclement weather.
Contributing to the research are Thenkurussi Kesavadas, associate
professor of mechanical and aerospace engineering and director of
the Virtual Reality Lab; Roger Mayne, professor of mechanical and
aerospace engineering, and Ann Bisantz, assistant professor of
industrial
engineering. |