*3.1. Weight Prediction Model of EHA*

Weight is an important property which should be minimized for aerospace applications. As shown in Figure 1, a EHA mainly has five basic parts: Pump, motor, cylinder, manifold, and power electronics. The total weight of the EHA can be defined as the sum of the gross weights of the five parts. In order to evaluate the weight of the EHA with the major design parameters in the preliminary design phase, two weight estimate methods are employed in the present study. The weight prediction, with the design parameters, usually uses the scaling law. It has the advantage of requiring only one reference component for a complete estimation of a product range [8,10]. More details of mass prediction of other components can be found in [8,17].
