A device that attaches to three body segments connected by two joints harvests energy selectively from one of the two joints using a single motor-generator. The device also selectively augments relative body segment motion about one of the two joints. Selection of the harvesting or generating mode depends on the user's preference. When in a particular mode, the device automatically selects which of the two joints to connect to the motor-generator in order to optimize the augmentation or harvesting. Depending on whether the user is on flat terrain, going up an incline or down a decline, the selection of the joint to be connected is different. Use of a single motor-generator and gearbox mounted near the knee reduces metabolic cost compared to the use of two motor-generators and gearboxes.

A device that attaches to three body segments connected by two joints harvests energy selectively from one of the two joints using a single motor-generator. The device also selectively augments relative body segment motion about one of the two joints. Selection of the harvesting or generating mode depends on the user's preference. When in a particular mode, the device automatically selects which of the two joints to connect to the motor-generator in order to optimize the augmentation or harvesting. Depending on whether the user is on flat terrain, going up an incline or down a decline, the selection of the joint to be connected is different. Use of a single motor-generator and gearbox mounted near the knee reduces metabolic cost compared to the use of two motor-generators and gearboxes.

A device that attaches to three body segments connected by two joints harvests energy selectively from one of the two joints using a single motor-generator. The device also selectively augments relative body segment motion about one of the two joints. Selection of the harvesting or generating mode depends on the user's preference. When in a particular mode, the device automatically selects which of the two joints to connect to the motor-generator in order to optimize the augmentation or harvesting. Depending on whether the user is on flat terrain, going up an incline or down a decline, the selection of the joint to be connected is different. Use of a single motor-generator and gearbox mounted near the knee reduces metabolic cost compared to the use of two motor-generators and gearboxes.

A device that attaches to three body segments connected by two joints harvests energy selectively from one of the two joints using a single motor-generator. The device also selectively augments relative body segment motion about one of the two joints. Selection of the harvesting or generating mode depends on the user's preference. When in a particular mode, the device automatically selects which of the two joints to connect to the motor-generator in order to optimize the augmentation or harvesting. Depending on whether the user is on flat terrain, going up an incline or down a decline, the selection of the joint to be connected is different. Use of a single motor-generator and gearbox mounted near the knee reduces metabolic cost compared to the use of two motor-generators and gearboxes.

A device, method and process to induce and amplify electrical energy through resonance and vibration, the device producing voltage and current generation with amplification within electrical motors, primarily DC motors, by vibration of the motors, including the capability to tune and control the regulation of the output current and voltage by the addition of electrical components with predictable results.