Gunhard Shock Isolation for IMU Sensors
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Solution Overview
Problem
Inertial measurement units (IMUs) face challenges in protecting sensitive components from high shock and vibration levels, particularly in ballistic and high dynamic environments, where traditional vibration isolators are insufficient, leading to performance degradation.
Innovation Solution
The implementation of a dampening material, such as silicone rubber, applied between the inertial sensor assembly housing and the IMU container, along with a sway space, to attenuate shock and vibration energy transfer, and the use of isolators on fasteners to further isolate the sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If inertial sensors are rigidly mounted within housing, then measurement precision is improved, but resistance to shock and vibration deteriorates
Solution Approach 1:
The dampening material is applied locally to the outer surface of the inertial sensor assembly housing, creating a protective layer precisely where shock and vibration energy first contacts the assembly. This localized treatment allows the internal rigid mounting structure to maintain measurement precision while the external dampening layer provides targeted shock and vibration resistance.
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
This solution effectively reduces the peak acceleration and deceleration forces experienced by the inertial sensors during high G events, such as gun launches, by approximately half, enhancing the IMU's performance and durability in extreme conditions.
Implementation Method 1
A dampening material is provided between the housing of the ISA and the container of the IMU
Implementation Method 2
The implementation of a dampening material, such as silicone rubber, applied between the inertial sensor assembly housing and the IMU container
Data Source
AI summary
An inertial measurement unit (IMU) is provided that includes a container that defines a cavity. A sensor suit or ISA having a housing is provided in the container of the IMU. A dampening material is provided between the housing of the ISA and the container of the IMU. The dampening material may be applied by coating, spraying, or dipping, or may be separately molded and then inserted, if desired. A sway space may also be provided between the ISA and the IMU container.