Powerful low-frequency ultrasonic systems are used to enhance the efficiency of various technologies in diverse fields of activity. The effectiveness of ultrasonic technological systems relies on the utilization of the resonance phenomenon, which necessitates the consideration of their waveguide nature and wave dimensions during the design of ultrasonic instruments. In some cases, to achieve positive effects of ultrasonic technologies, it is necessary to provide ultrasonic excitation of massive objects, the dimensions of which significantly exceed the half-wavelength of the ultrasonic wave in the material, and the shape of the object prevents it from being an ultrasonic waveguide instrument. To address such tasks and ensure highly efficient excitation of massive objects, a ring resonator can be utilized. This paper investigates a ring ultrasonic resonator with a diameter of approximately 2λ, designed to operate at a frequency close to 20 kHz. It is demonstrated that a ring resonator with geometry optimized in terms of waveguide properties and practical requirements can serve as an effective tool for ultrasonic excitation of massive objects.