The purposeo f this study is to clarify the transmittancec haracteristics of vibration energy from the exciting force due to the pressure variation in the cylinder to the casing vibration through various components inside the pump, and to find countermeasures to reduce the vibration energy during the transmittance process.
This is in additionto the formera ccepted measure of machining a relief groove in the valve plate. An experimental investigation was carried out using a swash plate type axial piston pump. The pressure in the cylinder, the vibration acceleration of the main components, the distribution of the vibration acceleration on the casing surface and the noise adjacent to the casing surface were measured.
The results presented in this study can be summarized as follows:
(1) The dominant vibration frequencies are the piston frequency and its harmonics.
(2) The vibrating system consisting of the swash plate and trunnion axis has the characteristics of a distributed parameter vibrating system.
(3) The casing vibration is mainly transmitted through the trunnion axis.
(4) The airborne noise spectrum (adjacent to the casing surface) corresponds closely with the spectrum of the casing vibration.

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In this research, the parameters of an electro-hydraulic servomotor, mass and equivalent coefficient of viscous friction of the coulomb friction force, are identified by the application of the Model Reference Adaptive Control( M. R. A. C. ).
On the other hand, for controlling the waveform displacement the Direct Digital Control (D. D. C. )is employed for the electro-hydraulic servo system's linear model follow-up control.
In this control system, the variable feedback velocity and acceleration gains at every sampling time are calculated using a digital computer and identified parameters, and the manipulating signal is generated by the digitalc omputer.
This control method was applied to the analog simulation circuit of the hydraulic servomotor and the experimental apparatus for confirmation, and the resultsw erea s follows:
(1) We confirmed that it is possible to identify the parameters of the hydraulic servomotor, mass and equivalentc oefficient of viscous friction of the coulomb friction force, by means of the application of the M. R. A. C.
(2) We confirmed that it is possible to control the waveform displacement of the electro-hydraulic servo system, with insensibility for the variation of load and the high waveform reappearance, and without the input amplitude dependency of the dynamic characteristics, by means of this control.

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