An apparatus and method for transferring energy from an internal combustion engine to drive a load. The system includes a rapid response component, a valve system and an actuator. The rapid response component is configured to be operatively coupled to a combustion portion of the internal combustion engine. The rapid response component is also configured to draw a portion of energy from the combustion in the internal combustion engine and transfer the portion of energy as a fluid including pulsitile fluid flow. The valve system is operatively coupled to the rapid response component and is operable to receive and controllably direct the pulsitile fluid flow from the rapid response component. The actuator is operatively coupled to the valve system and is configured to be operatively coupled to the load. The actuator operates to receive the fluid from the valve system to drive the load operatively coupled thereto.

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Evidence from biomechanics research suggests that tendon series elasticity allows muscle to act in an optimal range of its force–length and force–velocity curves to achieve work and power amplification. In this investigation we put forth a simple model to quantify the capacity of series elasticity to increase work and power output from an actuator. We show that an appropriate spring constant increases the energy that an actuator can deliver to a mass by a factor of 4. The series elasticity changes the actuator operating point along its force–velocity curve and therefore affects the actuator work output over a fixed stroke length. In addition, the model predicts that a series spring can store energy and deliver peak powers greater than the power limit of the source by a factor of 1.4. Preliminary experiments are performed to test model predictions. We find qualitative agreement between the model and experimental data, highlighting the importance of series elasticity for actuator work and power amplification across a fixed stroke length. We present several non-dimensional relations that can aid designers in the fabrication of robotic and prosthetic limbs optimized for work and power delivery.

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