Damped instrument kinematic mounts

• US 6,017,013 A
• Filed: 09/12/1997
• Issued: 01/25/2000
• Est. Priority Date: 09/12/1997
• Status: Expired due to Fees

• Current Assignee: Northrop Grumman Systems Corporation (Northrop Grumman Corporation)
• Original Assignee: TRW Limited (Zeppelin - Stiftung der Stadt Friedrichshafen)
• Inventors: Simonian, Stepan S.
• Primary Examiner(s): BERGER, DEREK JOEL
• Application Number:
  US08/928,199
• Time in Patent Office: 865 Days
• Field of Search: 248/603, 248/615, 248/632, 248/634, 248/638, 248/659, 248/160, 248/274.1, 248/276.1, 403/221, 403/225, 403/223, 267/140.11, 267/136, 267/140.5, 267/141
• US Class Current: 248/632
• CPC Class Codes: B64G 1/52 Protection, safety or emergency devices; Survival aids
• CPC Class Codes: B64G 1/66 Arrangements or adaptations of apparatus or instruments, not otherwise provided for
• CPC Class Codes: F16C 2326/47 Cosmonautic vehicles, i.e. bearings adapted for use in outer-space in general B64G
• CPC Class Codes: F16C 7/04 with elastic intermediate part of fluid cushion
• CPC Class Codes: 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

Abstract

A damped instrument kinematic mount providing novel damping features to protect instruments from damaging flight loads. The mounting scheme utilizes any number of identical strut elements to greatly reduce manufacturing complexity and costs. Improved kinematic mount performance is achieved by arranging the six strut configuration to approximately uncouple the mount suspension modes. A spherical joint damper is located at strut flexure locations and utilizes a viscoelastic damping material that deforms in shear. Alternatively, cylindrical slot mount dampers are placed at strut flexure locations. The cylindrical slot mount dampers use o-rings or washers placed within the slotted machined mount bar stock. The kinematic mounts can then be arranged in a classical truss arrangement pattern or other configuration providing desired damping characteristics.

Claims

1. A damped instrument kinematic mount comprising:

an instrument support means comprising a first flexural hinge integrally formed at one end thereof and a second flexural hinge integrally formed at a second end thereof;

a first damping means disposed about the first integral flexural hinge;

a second damping means disposed about the second integral flexural hinge;

wherein the first and second damping means are partial spherical dampers comprising an outer partial spherical shell concentrically arranged over an inner partial spherical shell, the outer and inner shells are secured to a relatively soft layer of viscoelastic damping material, and wherein the outer and inner shells have cylindrical extensions that connect to the instrument support means.

2. The damped instrument kinematic mount of claim 1, wherein the instrument support means comprises a single strut.

3. The damped instrument kinematic mount of claim 2, wherein the single strut is constructed of a titanium alloy.

4. The damped instrument kinematic mount of claim 1, wherein the instrument support means comprises a pair of struts disposed opposite to each other.

5. The damped instrument kinematic mount of claim 4, wherein the pair of struts is constructed of a titanium alloy.

6. The damped instrument kinematic mount of claim 1, wherein the instrument support means comprises two pairs of struts, wherein each pair of struts is disposed opposite to each other.

7. The damped instrument kinematic mount of claim 6, wherein the two pairs of struts are constructed of a titanium alloy.

8. The damped instrument kinematic mount of claim 1, wherein the partial spherical shells are constructed of titanium.

9. The damped instrument kinematic mount of claim 1 wherein the instrument support means comprises three pairs of struts wherein each strut is identical to the others and wherein each pair of struts is disposed relative to the other two pairs of struts to define an isosceles triangle instrument support base.

10. The damped instrument kinematic mount of claim 1 wherein the instrument support means comprises three pairs of struts wherein each strut is identical to the others and wherein each pair of struts is disposed relative to the other two pairs of struts to provide a predetermined axial line-of-action.

11. The damped instrument kinematic mount of claim 10, wherein the predetermined axial line-of-action is in a predetermined horizontal plane.

13. The damped instrument kinematic mount of claim 2, wherein the plurality of o-rings are constructed of a high damping viscoelastic material.

14. The damped instrument kinematic mount of claim 10, wherein the plurality of o-rings are constructed of a metallic alloy.

12. A damped instrument kinematic mount comprising:

an instrument support means comprising a first flexural hinge integrally formed at one end thereof and a second flexural hinge integrally formed at a second end thereof;

a first damping means disposed about the first integral flexural hinge;

a second damping means disposed about the second integral flexural hinge;

wherein the first and second damping means are cylindrical slot mount dampers comprising a plurality of o-rings placed within a plurality of annular slots disposed within the first and second integral flexural hinges.