Bicycle commuting has seen an increase in popularity over the past decade; with this influx of bicycle commuters, there has developed a need to understand the equipment associated with bicycle commuting.posted by maudlin at 5:48 PM on August 12, 2012 [1 favorite]
Specifically, the protection that carrying devices provide their contents - notably expensive electronic devices such as laptop computers - has not been well understood. It was hypothesized that a backpack would reduce the forces due to shock and vibration on a laptop computer during a typical bicycle commute by 10% compared to other commercial bicycle commuting packs.
An experiment was performed which investigated the relative protection that four common carrying devices - a backpack, a courier bag, and two rear-wheel panniers - provided a laptop computer. A 3-axis accelerometer was mounted to a laptop computer and placed inside each carrying device. A second 3-axis accelerometer was mounted to the bicycle frame seat post. Data was collected for three bicycle paths of varying terrain: a smooth, paved road, a rough sidewalk, and several curb drops. Five human subjects were used to test each carrying device on each of the three courses.
Results show that the laptop in the backpack experienced the lowest root mean square force over all courses while the laptop in the courier bag experienced the lowest peak force over each course; however, the respective root mean square forces experienced by the laptop in each of the four tested carrying devices over all tests were all within 20% and are well below the force threshold of a laptop computer. Furthermore, transfer function estimations were found for each of the carrying devices and provide further insight into the protection that each carrying device provides. The results of this study indicate that common commuter bike packs provide adequate protection for commuters' laptops.
You are not logged in, either login or create an account to post comments
posted by griphus at 5:16 PM on August 12, 2012