Vibration measurement device and CMS device for wind-power generation

1 . A vibration measurement device comprising:

an acceleration sensor including an element capable of measuring vibrations of an object under measurement;

an acceleration sensor mounting fixture disposed on a side of the acceleration sensor, adjacent to a position where the object under measurement is to be disposed;

an insulating member sandwiched between the acceleration sensor and the position where the object under measurement is to be disposed; and

an acceleration sensor cable including a pair of cable lines, a shield line, and a sheath that ties the pair of cable lines and the shield line together in a bundle and surrounds the pair of cable lines and the shield line from outside,

wherein a spring constant of the insulating member is greater than or equal to 2.0×10 9 N/m.

2 . The vibration measurement device according to claim 1 , wherein the insulating member includes a region protruding outward of the acceleration sensor and the acceleration sensor mounting fixture as viewed from above along a direction in which the acceleration sensor and the acceleration sensor mounting fixture are in alignment with each other.

3 . The vibration measurement device according to claim 1 , wherein

the insulating member is a single spacer having an insulating property,

the acceleration sensor and the acceleration sensor mounting fixture are coupled to each other by a fixing member having an insulating property, and

a filler is disposed in a gap between the fixing member, and the acceleration sensor and the acceleration sensor mounting fixture.

4 . The vibration measurement device according to claim 1 , further comprising a single tube having an insulating property, the tube covering an outer edge of the acceleration sensor and an outer edge of the acceleration sensor mounting fixture, wherein

the tube includes a region covering an outer periphery of the acceleration sensor and an outer periphery of the acceleration sensor mounting fixture as viewed from above along a direction in which the acceleration sensor and the acceleration sensor mounting fixture are in alignment with each other.

5 . The vibration measurement device according to claim 1 , wherein the acceleration sensor mounting fixture has conductivity.

6 . The vibration measurement device according to claim 1 , wherein

the acceleration sensor mounting fixture is capable of electrically insulating between the acceleration sensor and the object under measurement, and

either an adhesive or grease is disposed in a gap between the insulating member and the acceleration sensor mounting fixture.

7 . The vibration measurement device according to claim 1 , wherein

the acceleration sensor mounting fixture is connected to a side of the acceleration sensor, adjacent to the object under measurement,

the acceleration sensor mounting fixture is the insulating member capable of electrically insulating between the acceleration sensor and the object under measurement, and

an outer edge of the acceleration sensor mounting fixture has a part protruding outward of an outer edge of the acceleration sensor as viewed from above, and the protruding part extends in a direction intersecting a direction along a connection surface where the acceleration sensor mounting fixture connects with the acceleration sensor.

8 . The vibration measurement device according to claim 7 , wherein the outer edge of the acceleration sensor mounting fixture has a wave shape.

9 . The vibration measurement device according to claim 7 , wherein

the acceleration sensor mounting fixture includes a first part disposed on the side of the acceleration sensor, adjacent to the object under measurement and extending in a direction along the connection surface, and a second part bending from the first part and extending away from the first part, and

the acceleration sensor is surrounded by the first part and the second part of the acceleration sensor mounting fixture.

10 . The vibration measurement device according to claim 9 , further comprising a gap filler disposed in a gap between the second part and the acceleration sensor, wherein

the gap filler is higher in dielectric strength than air.

11 . The vibration measurement device according to claim 1 , wherein

the object under measurement and the acceleration sensor are electrically insulated from each other by the insulating member included in the acceleration sensor mounting fixture, and

the shield line is electrically connected to a side of the insulating member, adjacent to the acceleration sensor.

12 . The vibration measurement device according to claim 11 , wherein

the shield line is electrically connected to a conductive connector, and

the shield line is electrically connected to the side of the insulating member, adjacent to the acceleration sensor by the conductive connector.

13 . The vibration measurement device according to claim 11 , wherein the acceleration sensor mounting fixture includes a metal portion, and a non-metal portion as the insulating member.

14 . The vibration measurement device according to claim 13 , wherein the insulating member is an insulating film with which a surface of the metal portion is coated.

15 . The vibration measurement device according to claim 13 , wherein the insulating member includes either resin or ceramic.

16 . The vibration measurement device according to claim 13 , wherein the insulating member is in contact with the object under measurement.

17 . The vibration measurement device according to claim 13 , wherein the metal portion and the insulating member are joined together by an adhesive.

18 . A CMS device for wind-power generation using the vibration measurement device according to claim 1 .