Any smartphone in any car can pick up a span’s unique vibrations. Tracking how that changes over time reveals hidden structural problems.
Next, to get more loosey-goosey with it, the scientists asked the rideshare app Uber for accelerometer data from its drivers as they crossed the Golden Gate. “I don't know what type of phone they have, I don't know what type of car they have, I have no idea how fast they're going,” says Matarazzo. Still, that data was also able to accurately estimate the modal frequency, compared to the bridge sensor data.
But if measuring a change in the modal frequency is like figuring out that the bridge is running a fever, engineers still have to figure out what’s causing it. That may be tricky, because the natural environment can also influence the frequency by changing the state of steel and concrete—for instance, when outdoor temperatures rise and fall. But Matarazzo notes thatWith every passing year, the need to properly monitor these thousands of aging bridges grows.
the use of smartphones to detect the modal frequencies of bridges. “That's why bridges are collapsing everywhere. Unless you have a system like this, I think we're not going to be able to handle it.”
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