An experiment was arranged to study the proposed measurement method, see Fig. 3. A dummy tool of ferromagnetic
material without cutter was manufactured and mounted in a Dynamite, 3 axis vertical milling machine. An adaptive
magnetic bearing (AMB) was used to apply non-contact electromagnetic force to the dummy tool while embedded inductive
displacement sensors (DS) measured the tool response in the x- and y-directions simultaneously. The inductive displacement
sensors were arranged in pairs, one pair measured the displacement in the x-direction and the other pair in the ydirection.
Each pair where coupled together with opposite signs facing the tool with 180 degrees apart. This arrangement of
the displacement sensors cancels any changes in displacement due to thermal expansion of the rotor diameter. The surface
of the LDV measurement position (LMP) was polished optically smooth. The surface texture was measured using a Wyko
NT1100 optical profiler (www.veeco.com). The arithmetic average deviation from the mean line within the assessment
length, Ra, was measured to 0.021 mm, which is within the range of optically smooth rotors given in Ref. [9]. The measurement
surface could be made temporary rough by spraying it with a developer for crack testing (paint). This paint could
easily be removed without scratching the surface. The sprayed surface showed thousand times larger surface roughness,
Ra¼21.02 mm, and can be considered optically rough. The sensitivity of the inductive displacement sensors are 110 mm V1
.
The measurement range is 0–5 kHz and the limiting gap between the rotating dummy tool and the displacement sensor is
150 mm.
An experiment was arranged to study the proposed measurement method, see Fig. 3. A dummy tool of ferromagneticmaterial without cutter was manufactured and mounted in a Dynamite, 3 axis vertical milling machine. An adaptivemagnetic bearing (AMB) was used to apply non-contact electromagnetic force to the dummy tool while embedded inductivedisplacement sensors (DS) measured the tool response in the x- and y-directions simultaneously. The inductive displacementsensors were arranged in pairs, one pair measured the displacement in the x-direction and the other pair in the ydirection.Each pair where coupled together with opposite signs facing the tool with 180 degrees apart. This arrangement ofthe displacement sensors cancels any changes in displacement due to thermal expansion of the rotor diameter. The surfaceof the LDV measurement position (LMP) was polished optically smooth. The surface texture was measured using a WykoNT1100 optical profiler (www.veeco.com). The arithmetic average deviation from the mean line within the assessmentlength, Ra, was measured to 0.021 mm, which is within the range of optically smooth rotors given in Ref. [9]. The measurementsurface could be made temporary rough by spraying it with a developer for crack testing (paint). This paint couldeasily be removed without scratching the surface. The sprayed surface showed thousand times larger surface roughness,Ra¼21.02 mm, and can be considered optically rough. The sensitivity of the inductive displacement sensors are 110 mm V1.The measurement range is 0–5 kHz and the limiting gap between the rotating dummy tool and the displacement sensor is150 mm.
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