In this study, the fluid bulk-modulus within a hydrostatic transmission is examined. Specifically, a method for measuring the effective fluid bulk-modulus is proposed based upon the definition of the fluid bulk-modulus and the conservation of mass within the system. Using the measured parameters of flow and pressure, a numerical solution for the effective fluid bulk-modulus is carried out and a closed-form approximation to this solution is presented. Furthermore, the accuracy expectations of this method are discussed and compared with traditional methods of estimating the fluid bulk-modulus and it is shown that significant improvements can be made when the method of this research is employed.

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