Suspended Inertial Unit Mounting for Shock-Stable Alignment
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Solution Overview
Problem
Inertial devices face performance degradation due to mechanical stresses from shocks and vibrations, as the insert moves relative to the inertial device, generating mechanical stresses that alter performance.
Innovation Solution
Inertial units with fixing studs featuring a centering portion and housing allowing a play of up to 50 μm, preventing sliding and limiting mechanical stresses by ensuring precise alignment and secure attachment between the support frame and inertial device using a body of elastically deformable material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the insert is suspended relative to the inertial device using a body of elastically deformable material, then the transmission of movements and shocks to the inertial device is dampened, but the insert can move relative to the inertial device under shocks and vibrations, generating mechanical stresses that alter performance
Solution Approach 1:
A centering portion is introduced as an intermediary element between the insert and the inertial device. This centering portion ensures proper alignment and positioning of the insert relative to the inertial device, preventing relative movement and mechanical stress while maintaining the shock-dampening function of the elastically deformable body.
Solution Approach 2:
The centering portion creates a centered, equipotential positioning of the insert within the bore, ensuring uniform distribution of forces and eliminating偏心 (eccentricity) that would cause relative movement and mechanical stress on the inertial device during vibration and shock events.
2Stability of the object's composition
If the insert is directly fixed to the inertial device, then relative movement is prevented, but the shock-dampening capability is reduced
Solution Approach 1:
Different parts of the fixing structure have different properties: the body of elastically deformable material provides shock dampening, while the centering portion provides precise positioning and alignment. This local differentiation allows each component to optimize its specific function without compromising the other.
Solution Approach 2:
The fixing structure is segmented into distinct functional components: the elastically deformable body for shock absorption and the centering portion for positioning stability. This segmentation allows independent optimization of shock-dampening and position-stability functions.
3Stress or pressure
If the insert is allowed to move relative to the inertial device to absorb shocks, then shock transmission is reduced, but mechanical stresses are generated that alter device performance
Solution Approach 1:
The centering portion acts as a mediator that maintains precise alignment between the insert and the inertial device even during shock events. It ensures that the insert remains properly positioned within the bore, preventing misalignment and eccentric loading that would generate harmful mechanical stresses.
Solution Approach 2:
The centering portion is designed to maintain proper alignment beforehand, preventing the occurrence of misalignment and eccentric stresses before they can occur during shock and vibration events, rather than correcting them after they occur.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively prevents relative movement between the insert and inertial device, reducing mechanical stresses and enhancing the performance and reliability of inertial navigation systems by maintaining precise alignment and secure attachment.
Implementation Method 1
a body of elastically deformable material
Implementation Method 2
The body made of elastically deformable material can thus dampen the transmission to the inertial device of the movements and shocks that the chassis would have undergone
Data Source
Figure 1
Figure 2~3
AI summary
A unit comprising an inertial sensing device (1) provided with attachment pads (10) allowing the inertial device to be attached to a support frame (100), at least one of the attachment pads (10) comprising two elements, one of which is attached to the support frame, having a bearing surface in contact with a bearing surface of the support frame, and the other of which is attached to the inertial device, having a bearing surface in contact with a bearing surface of the inertial device, and which are suspended relative to each other by means of a body made from elastically deformable material, at least one of the elements being attached by at least one screw and the corresponding bearing surfaces being respectively provided with a centring portion (43) and a recess (3) receiving said centring portion, the fit allowing a maximum clearance of 50 μm.