An elastic body of this disclosure contains magnetized magnetic powder dispersed in an elastic member, and generates an induced current in a circuit by undergoing an elastic deformation to cause a change in magnetic flux density. The elastic member is an elastomeric foam.

A system includes a first levitation magnet. The system also includes a suspension magnet configured underneath the first levitation magnet. The suspension magnet oscillates continuously. Magnetic flux cuts across electrical coil windings. Energy is generated as a result of the magnetic flux that cuts across the electrical coil windings. A second levitation magnet is positioned underneath the suspension magnet and first levitation magnet. The suspension magnet is configured to levitate between the first levitation magnet and the second levitation magnet.

A smart ring is configured harvest mechanical energy using piezoelectricity. The smart ring includes a ring-shaped housing, a power source disposed within the ring-shaped housing, and a charging circuit. The charging circuit includes a piezoelectric harvesting element, and is configured to charge the power source when user motion causes a mechanical deformation in the piezoelectric harvesting element. The smart ring further includes a component, disposed within the ring-shaped housing and configured to draw energy from the power source, and further configured to perform at least one of: i) sense a physical phenomenon external to the ring-shaped housing, ii) send communication signals to a communication device external to the ring-shaped housing, or iii) implement a user interface.

A smart ring is configured harvest mechanical energy using piezoelectricity. The smart ring includes a ring-shaped housing, a power source disposed within the ring-shaped housing, and a charging circuit. The charging circuit includes a piezoelectric harvesting element, and is configured to charge the power source when user motion causes a mechanical deformation in the piezoelectric harvesting element. The smart ring further includes a component, disposed within the ring-shaped housing and configured to draw energy from the power source, and further configured to perform at least one of: i) sense a physical phenomenon external to the ring-shaped housing, ii) send communication signals to a communication device external to the ring-shaped housing, or iii) implement a user interface.

Provided is an energy harvester and an engine monitoring system. An engine monitoring system using an energy harvester includes at least one or more self-power generation wireless sensor nodes for generating electric energy using the energy harvester and monitoring an engine; and a management server that receives and manages sensing information received from the self-power generation wireless sensor nodes. The self-power generation wireless sensor nodes includes sensor modules monitoring the engine; a data processing unit identifying and packaging sensing information; a wireless communication unit wirelessly transmitting the packaged sensing information to the management server; the energy harvester generating electric energy to be supplied to the sensor modules, the data processing unit, and the wireless communication unit by converting vibration energy of the engine into the electric energy; and a power management unit controlling the electric energy to supply the electric energy to the sensor modules, the data processing unit.

Provided is an energy harvester and an engine monitoring system. An engine monitoring system using an energy harvester includes at least one or more self-power generation wireless sensor nodes for generating electric energy using the energy harvester and monitoring an engine; and a management server that receives and manages sensing information received from the self-power generation wireless sensor nodes. The self-power generation wireless sensor nodes includes sensor modules monitoring the engine; a data processing unit identifying and packaging sensing information; a wireless communication unit wirelessly transmitting the packaged sensing information to the management server; the energy harvester generating electric energy to be supplied to the sensor modules, the data processing unit, and the wireless communication unit by converting vibration energy of the engine into the electric energy; and a power management unit controlling the electric energy to supply the electric energy to the sensor modules, the data processing unit.

A linear generator includes one or more helices, and one or more magnet members movable relative to a first helix to generate electric energy within the first helix. The first helix includes a first coil. The first helix and/or the magnet members have a density less than that of water such that the first helix and/or the magnet members have buoyant properties when the linear generator is at least partially submerged in the water.

A dual-conductor based electromechanical energy conversion system. The system includes an external force device, a moving object connecting frame, a moving object, a dual-conductor assembly and a platform connecting frame. The external force device is connected with the moving object through the moving object connecting frame. The dual-conductor assembly is arranged under the moving object in parallel. The dual-conductor assembly is connected with an external platform through the platform connecting frame. The moving object generates a relative motion with the dual-conductor assembly according to an external force. The dual-conductor assembly generates an alternating current according to an alternating magnetic field generated by the moving object.

A smart ring is configured harvest mechanical energy using piezoelectricity. The smart ring includes a ring-shaped housing, a power source disposed within the ring-shaped housing, and a charging circuit. The charging circuit includes a piezoelectric harvesting element, and is configured to charge the power source when user motion causes a mechanical deformation in the piezoelectric harvesting element. The smart ring further includes a component, disposed within the ring-shaped housing and configured to draw energy from the power source, and further configured to perform at least one of: i) sense a physical phenomenon external to the ring-shaped housing, ii) send communication signals to a communication device external to the ring-shaped housing, or iii) implement a user interface.

A smart ring is configured harvest mechanical energy using piezoelectricity. The smart ring includes a ring-shaped housing, a power source disposed within the ring-shaped housing, and a charging circuit. The charging circuit includes a piezoelectric harvesting element, and is configured to charge the power source when user motion causes a mechanical deformation in the piezoelectric harvesting element. The smart ring further includes a component, disposed within the ring-shaped housing and configured to draw energy from the power source, and further configured to perform at least one of: i) sense a physical phenomenon external to the ring-shaped housing, ii) send communication signals to a communication device external to the ring-shaped housing, or iii) implement a user interface.