PMC

Wheel sensor system. (a) Overview of the wheel sensor system. (b) Overview of the tactile force sensor. (c) Installation of the tactile force sensors on the wheel (d) Schematic view of the sensor cover.

Candidate substrate designs for aligned electrospun PLLA nanofibers. Photos (A, C, E) and SEM images (B, D, F) of nanofibers spun onto glass cover slips. (A, B) Fibers were directly electrospun on cover slips attached to the rotating target wheel. No glue was used to fasten them to the cover slip. (C, D) Fibers were electrospun on the rotating target wheel, removed, and glued to the cover slip at the ends of the fiber bundle with PLGA (85:15). (E, F) Cover slips were painted with a stripe of PLGA down the center and taped to the wheel, and PLLA fibers were electrospun while the PLGA was still wet. Additionally, a “moat” was created in this preparation by painting a wall of PLGA on the perimeter of the cover slip to hold the cell suspension at the time of plating. SEM images reveal that fiber alignment is equal among each substrate design. Cover slips are 22 × 22 mm², scale bar = 20 μm.

(a) Set-up for the warm-up with colored cushions for the children to sit on, a fair wheel of fortune with each of the colors on it and the stuffed animal dog, (b) two wheel covers used in the test (fair–all three children could get the big sticker box, unfair: only the tested child sitting on the orange cushion could get the big sticker box), the chosen cover was attached to the wheel dummy and then the wheel was spun once, (c) back of the wheel with a weight attached to it. The weight could be fixed to three different positions on the back of the wheel to determine the final position after spinning.

Instruction for wheel assembly: (a) print 3D solids and clamps, (b) insert the DC motor into the wheel axle, (c) attach the DC motor to the car chassis and (d) cover the wheel with a tire.