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Biologically Inspired Robotics
FIGURE 3.2
Three-dimensional design of the Bio-Cycle.
enhance the muscle strength of the upper limbs, lower limbs, chest, back,
and abdomen but that the multiriding modes add a lot of fun to exercise. A
three-dimensional design of the Bio-Cycle is shown in Figure 3.2.
3.2 Bionic Analysis and Scheme
3.2.1 Bionic Analysis of the System
The Bio-Cycle was inspired by the cheetah as well as other four-legged
animals. As a member of the big cat family, the cheetah is the best runner
in the animal world. When running at a high speed, the cheetah jumps
forward by treading the ground with both of its forelegs at the same time
and alternately pushing with both of its hind legs. Figure  3.3 shows the
two states in a cycle of the cheetah’s run. In this mode, the cheetah’s powerful legs provide it with great strength and enable it to run at a speed of
more than 100 km per hour. Different from running, when walking at a
normal speed, the cheetah alternately uses one side of its foreleg and hind
leg together to walk first, and then the other side, as shown in Figure 3.4.
To imitate this running motion, we designed the Bio-Cycle with a four-drive
structure. In the bionic riding mode of cheetah-like running, the user’s legs
are treading and two hands are pushing forward at the same time. This
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