초록 ▼

Apparatus for generating a controlled parameter elliptically polarized shear wave into an earth medium. The apparatus consists of a baseplate for engagement with the earth medium in omni-directionally resistant manner and a reaction mass and actuator assembly affixed thereto and energizable to impar

Apparatus for generating a controlled parameter elliptically polarized shear wave into an earth medium. The apparatus consists of a baseplate for engagement with the earth medium in omni-directionally resistant manner and a reaction mass and actuator assembly affixed thereto and energizable to impart reciprocal lateral forces to the baseplate that exert a predetermined resultant force at a controlled rate of rotation.

대표청구항 ▼

Apparatus for generation of elliptically polarized shear waves in an earth medium, comprising: baseplate means including an earth engaging surface which is equally omni-directionally resistant to movement relative to said earth medium; and force generation means affixed centrally to said baseplate m

Apparatus for generation of elliptically polarized shear waves in an earth medium, comprising: baseplate means including an earth engaging surface which is equally omni-directionally resistant to movement relative to said earth medium; and force generation means affixed centrally to said baseplate means and consisting of a non-rotative, resiliently suspended reaction mass means and at least two hydraulic, linear drive means secured to said reaction mass and generating an effective radial force directed outward against the omni-directional resistance of said baseplate means and generally parallel to the earth engaging surface, which effective radial force is instantaneously linear but rotating at a preselected angular velocity relative to said earth engaging surface of said baseplate means.