Abstract:
Described herein are propulsive force devices for providing propulsive force to integrated wireless devices for science education (e.g., Newton's laws of motion, kinematics, etc.). A propulsive force device includes a motor to drive a rotating member to generate a propulsive force and a motor driver coupled to the motor. The motor driver controls operation of the motor and at least one processing unit is coupled to the motor driver. The at least one processing unit is configured to receive a control signal from an integrated wireless device to adjust at least one parameter of the propulsive force device and to provide a control signal to the motor driver to control operation of the motor driver including adjustment of the at least one parameter.
Abstract:
A ball collision demonstration device includes a base, and first and second support assemblies carried by the base. The first and second support assemblies are spaced-apart and angled away from each other so that a separation distance at opposing ends of the first and second support assemblies is greater than a separation distance at medial portions of the first and second support assemblies. The device further includes balls, and a respective pairs of flexible lines coupled between the first and second support assemblies and each ball. The balls are suspended in a horizontal line parallel to the base. The respective pairs of flexible lines have, from the medial portions towards the opposing ends of the first and second support assemblies, increasing line lengths and increasing separation distances between each pair.
Abstract:
The control and measurement training device includes a beam pivotally mounted upon a support at one end, with an actuator attached to the opposite end of the beam to adjust the slope or tilt of the beam. A ball travels along the beam, and is retained on the beam by opposite raised stops at the ends of the beam and by lateral wires extending the length of the beam. An optical sensor, e.g., a webcam, is used to sense the position and/or a velocity of the ball as it travels along the beam when the beam is tilted. The two end stops of the beam have differently colored tags thereon, with the ball being a third color. A control system and software are provided to adjust the beam to a slope and level the beam to stop motion of the ball and position or center the ball on the beam.
Abstract:
A method and apparatus for determining a trajectory for a vehicle can include: identifying a starting position (p0) and desired terminal position (P) for the vehicle; linearly approximating dynamics of the vehicle; and using the starting position (p0), terminal position (P), and linear approximation, determining the trajectory; wherein the linear approximation can be constrained by a requirement (e.g., specification) that the vehicle may not travel in a region; a center point of the region is at a distance from a predetermined point on the vehicle substantially equal to a minimum turn radius of the vehicle, in a direction substantially perpendicular to a velocity of the vehicle; and a distance from the center point of the region to a point on a perimeter of the region is greater than or substantially equal to the minimum turn radius of the vehicle.
Abstract:
A method and apparatus are disclosed for determining a trajectory for a vehicle, wherein the method includes: identifying a starting position (p0) for the vehicle; identifying a desired terminal position (P) for the vehicle; linearly approximating dynamics of the vehicle; and using the starting position (p0), the desired terminal position (P), and the linear approximation, determining the trajectory for the vehicle. The linear approximation can be constrained by a requirement (e.g., specification) that a magnitude of a velocity of the vehicle is greater than or equal to a threshold value for the velocity. The vehicle may have a curvature limit.
Abstract:
This invention relates to a mechanical fixture which simulates a four bar link drive system for pedal driven scooters and bicycles and the resulting drive system. A four bar drive link system simulator has a frame assembly, a proximal hinge attachment bracket, a bottom bracket simulator, a pair of crank levers, a pair of coupling levers and a pair of pedal levers. The frame assembly has a plurality of guide rails, including at least a proximal hinge adjustment rail, and a frame rail. The proximal hinge attachment bracket is connected to the proximal hinge adjustment rail. The bottom bracket simulator is attached or otherwise connected to the frame simulator rail.
Abstract:
A system for demonstrating a path of a projectile comprises a flexible wire, a first attachment device connected to a first end of the flexible wire, a second attachment device connected to a second end of the flexible wire, a coupling assembly comprising a trajectory rod attachment device configured to attach to a trajectory rod and a wire attachment device movably connected to the trajectory rod attachment device and configured to attach to the flexible wire.
Abstract:
An article is described that can be used as a demonstrator of multiple stresses making it possible notably to compare the results of simulation tests for various types of mechanical stresses. The demonstrator can be an article made in a single piece out of plastic material having a ribbed central beam and two lateral plates. Bending, tensile, compression and torsion tests can notably be carried out on such a demonstrator.
Abstract:
Disclosed is a method and apparatus for recording and evaluating of the accuracy of predictions of random or unpredictable future events. The invention may be used for educational purposes and in games of chance. In one embodiment, it discloses a method and apparatus whereby a particular astronomical object or region of the natural sky is identified. The section of the sky so identified could be the surface of the sun or the night sky. This identification can be considered an “observation field” or “playing field” upon which gaming or study will take place. Superimposed upon this field is a geometric pattern, such as a grid, dividing the sky into pre-determined regions. The invention then compares actual events to predicted events and notifies the user if the user was or was not successful at predicting the event.
Abstract:
A hypersurface orbital model is presented that orbits a ball on a surface called a hypersurface. A stepper motor drive arrangement, with two-degrees of freedom, is used to change the hypersurface viewed by the ball as a function of time. System control is added to ensure that the ball will orbit in the proper orbit. Control consists of a stepper motor, a clock, a solenoid launcher and various logical circuits. Counters keep track of the period so that the exact rotational speed can be referenced to set the ball launcher.