The same number as a car driven by a person. The precise number would depend on the make and model of the car.
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However many the designer wants it to have.
It depends on what kind of robot you are talking about.
In a robot there is a joint where ever you put a motor that will move the metal/plastic "bones" of the robot so you can have as many joints as you like. Source: My Brain
Entertainment robots apparently have 7 flexible joints.
50
4
Rescue robots typically have multiple degrees of freedom (DoF) in their flexible joints to navigate complex environments effectively. The number of DoF can vary depending on the robot's design; for instance, robotic arms may have 5 to 7 DoF to allow for a wide range of motion. Additionally, mobile rescue robots may have wheels or tracks that provide further movement capabilities, contributing to their overall flexibility. Ultimately, the specific configuration will depend on the robot's intended tasks and design.
P. Th. L. M. van Woerkom has written: 'Accuracy of modal frequency set with fictitious joints modelling' -- subject- s -: Flexible bodies, Joints, Modal response, Manipulators 'On fictitious joints modelling of manipulator link flexibility for the HERA simulation facility pilot' -- subject- s -: Joints, Hermes manned spaceplane, Manipulators 'Synthesis of local control for a robotic manipulator joint' -- subject- s -: Actuators, Joints, Robotic manipulators 'Equivalent flexibility modelling for the recursive simulation of robot manipulator dynamics' -- subject- s -: Flexible bodies, Many body problem, Manipulators 'Quasi-recursive dynamics equations for spacecraft-based flexible robotic manipulators' -- subject- s -: Flexible bodies, Many body problem, Dynamic models, Manipulators
A robotic vacuum cleaner typically has two flexible joints: one at the base where the vacuum head connects to the main body, and another at the point where the main body connects to the wheels for maneuverability.
Many bones have many joints, hence, great flexibility.
Robear, the caregiving robot developed in Japan, features multiple degrees of freedom to effectively assist in tasks such as lifting and supporting patients. It has approximately 16 degrees of freedom, allowing for flexible movements that mimic human-like interactions. This level of articulation enables Robear to navigate various caregiving scenarios while ensuring safety and comfort for those it assists.