# US 2012/0074627 A1 · Actuator arrangement for active vibration isolation comprising an inertial reference mass

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- Number: US 2012/0074627 A1
- Document ID: US20120074627A1
- Status: Published application
- Kind: A1
- Application number: 13/314,353
- Filed: 2011-12-08
- Published: 2012-03-29
- Earliest claimed: 2003-09-05
- Assignees: Koninklijke Philips Electronics N.V.
- Inventors: Michael Johannes Vervoordeldonk; Theo Anges Maria Ruijl; Robertus Mathijs Gerardus Rijs; Johannes Corenlius Antonius Muller
- Web page: https://patentgrep.com/patent/US20120074627A1

## CPC

- B60G 17/016: characterised by their responsiveness, when the vehicle is travelling, to specific motion, a specific condition, or driver input {(B60G17/017 takes precedence)}
- B60G 13/16: having dynamic absorbers as main damping means, i.e. spring-mass system vibrating out of phase
- B60G 17/0152: {characterised by the action on a particular type of suspension unit (B60G17/01941 takes precedence)}
- F16F 15/02: Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems ({F16F15/005 takes precedence } ; layered products B32B; suppression of vibration in ships B63; {relieving load on bearings, using magnetic means F16C39/06})
- B60G 2202/24: Fluid damper
- B60G 2202/25: Dynamic damper
- B60G 2202/42: Electric actuator
- B60G 2400/206: Body oscillation speed; Body vibration frequency
- B60G 2400/252: vertical
- B60G 2800/162: Reducing road induced vibrations
- B60G 2800/916: Body Vibration Control
- B60G: VEHICLE SUSPENSION ARRANGEMENTS (air-cushion vehicles B60V; {cycle suspensions B62K25/00})
- F16F: SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION

## Abstract

Actuator arrangement with an actuator (8), a reference mass (22), a spring (24) and a first sensor (26; 42, 43; 32, 36). The actuator (8) applies a force between a first object (2) relative to a second object (16; 54). The reference mass (22) is, in use, supported by a third object (16; 56) by means of the spring (24). The first sensor (26; 42, 43; 32, 36) generates a first distance signal that depends on a first distance (z2; z5,z6; z3,z4) between the reference mass (22) and the first object (2) and is provided to a controller (6) to actuate the actuator (8).

## Claims

### Claim 1

Actuator arrangement comprising an actuator (8), a reference mass (22), a first suspension (24) with at least a predetermined spring characteristic in at least one degree of freedom, and a first sensor (26; 42, 43; 32, 36), the actuator (8) being arranged to apply a force between a first object (2) and a second object (16; 54), the reference mass (22) being arranged to be supported by a third object (16; 56) by means of said first suspension (24), and said first sensor (26; 42, 43; 32, 36) being arranged to generate a first distance signal that depends on a first distance (z2; z5,z6; z3,z4) between said reference mass (22) and said first object (2) and to provide said first distance signal to a controller (6) to actuate said actuator (8).

### Claim 2 (depends on 1)

Actuator arrangement according to claim 1, wherein said actuator (8) is a Lorenz actuator.

### Claim 3 (depends on 1)

Actuator arrangement according to claim 1, wherein said actuator arrangement comprises a second sensor (36) for measuring a second distance (z4) between said first object (2) and said second object (16), a first filter (40) connected to said first sensor (26) to generate a first filtered output signal, and a second filter connected to said second sensor (36) to generate a second filtered output signal, the first and second filtered output signals to be applied to said controller (6).

### Claim 4 (depends on 1)

Actuator arrangement according to claim 1, wherein said actuator arrangement comprises a housing (44) arranged to protect said reference mass (22) and said first suspension (24) and having a surface to be located between said first object (2) and said reference mass (22), said first sensor comprising a first subsensor (42) and a second subsensor (43), said first subsensor (42) being arranged to measure a third distance (z5) between said reference mass (22) and said surface of said housing (44), and said second subsensor (43) being arranged to measure a fourth distance (z6) between said surface of said housing (44) and said first object (2).

### Claim 5 (depends on 1)

Actuator arrangement according to claim 1, wherein said first sensor (26) comprises a first subsensor (36) and a second subsensor (32), the first subsensor (36) being arranged to measure a third distance (z4) between said first object (2) and said third object (16; 56) and to generate a third output signal, the second subsensor (32) being arranged to measure a fourth distance (z3) between said reference mass (2) and said third object (16; 56) and to generate a fourth output signal, the fourth output signal to be subtracted from said third output signal before delivery to said controller (6).

### Claim 6 (depends on 5)

Actuator arrangement according to claim 5, comprising a housing (44) to protect said reference mass (22) and said first suspension (24).

### Claim 7 (depends on 1)

Actuator arrangement according to claim 1, comprising a further sensor (32) and a filter (50), the further sensor (32) being arranged to measure a further distance (z3) between said reference mass (22) and said third object (16; 56) and to generate a further output signal for said filter (50) that is arranged to provide a filtered output signal, the filtered output signal to be sent to said controller (6) to allow for compensation of transfer of vibrations of said second object (16) to said first object (2).

### Claim 8 (depends on 1)

Actuator arrangement according to claim 1, wherein said first suspension (24) is implemented by means of a second actuator (30), a still further sensor (32) for measuring a still further distance (z3) between said reference mass (22) and said third object (16; 56), and a further controller (34) arranged to receive a still further output signal from said still further sensor (32) and to actuate said second actuator (30).

### Claim 9 (depends on 1)

Actuator arrangement according to claim 1, wherein said second object and said third object are one and the same.

### Claim 10 (depends on 1)

Actuator arrangement according to claim 1, wherein said third object (56) is supported by said second object (16) by a second suspension (57), said actuator is supported by a fourth object (54), and the fourth object is supported by said second object by a third suspension (55).

### Claim 11 (depends on 1)

Actuator arrangement according to claim 1, wherein said actuator arrangement comprises a sky hook control arrangement (4, 62) for controlling displacement of said first object (2).

### Claim 12 (depends on 1)

Active vibration isolation arrangement comprising at least one actuator arrangement according to claim 1, and comprising said controller (6) to control at least said actuator (8).

### Claim 13 (depends on 9)

Active vibration isolation arrangement according to claim 9, comprising at least one airmount (10; 10′) to support said first object (2).