Hydraulic dynamometer and method for measuring power of power machine

A hydraulic dynamometer and a method for measuring the power of a power machine are characterized in that a casing of the hydraulic dynamometer is provided with m arm levers, m is a natural number greater than or equal to 2, the m arm levers are arranged side by side at intervals along the axial direction of the casing, each arm lever is used as an independent measuring contact, the end part of each arm lever is provided with a force transducer, and the force transducer is used for measuring the power of the power machine. Each force measuring sensor is matched with the dynamometer base through a single connecting device, and the force measuring sensors are used for measuring end part acting force borne by the end part of the arm rod when the end part of the arm rod is restrained; the measuring range corresponding to the ith force transducer is fi, the static error is Ai, the numerical values of fi are sequentially increased, and i = 1,..., m. Therefore, when the rated power of the power machine used for test