Robots Typically Can’t Outrun Animals (Download)
Power density is a measure of how much power can be processed in any given space. It's quantifiable as the amount of power processed per unit of volume in units of watts per cubic meter (W/m3) or watts per cubic inch (W/in.3). In industrial automation, optimizing parameters and rising-edge dead time can help minimize losses and improve power density.
In the power density realm, this article explains why animals are far better at running than robots.
Two rudimentary mechanical properties are thought to characterize each unit of muscle mass as a motor: its maximum work density and its maximum power density.