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The world's first continuous variable capacity rotary compressor for automotive air conditioning, DCV-14A, has been developed. Compressors for automotive air conditioning are classified broadly into swash plate type, rotary type, radial piston type, wobble plate type and scroll type. Among these compressors, the wobble plate type is the only compressor that has been made continuously variable capacity. Meanwhile, the development of a rotary variable capacity compressor has been attempted, but it has been successful only in stepwise variation of capacity. The DCV-14A, however, has made continuous variable capacity possible, and it has eliminated problems that the wobble plate type variable capacity compressors have; such as noise, vibration, and insufficient reliability.

Today, time available for production development is shorter and good quality development is required. Using the finite element method is a mean of meeting this requirement. This method of analysis is very adaptable to many fields and can predict static stress, strength, endurance, resonance, dynamic stress, thermal conductivity, convection, radiation, the optimum design, sound, fluid behavior, and electromagnetics in a short period. Furthermore, finite element methods are becoming more practical because of increased speed by computer vector operations and the main memory expansion of computers. This paper outlines an analytical model for studying vibration characteristics including amplitude, modal shapes and stress while a variable displacement compressor is operating. Finite element analysis reveals the dynamic behavior of the mounts and body of this compressor.