Vibration Damper for Automotive PCB Using Counterforce
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Solution Overview
Problem
Engine Control Units (ECUs) face reliability issues due to excessive vibrations, which can damage solder joints on Printed Circuit Boards (PCBs), and conventional methods like increasing stiffness lead to overlapping mode shapes, inducing further vibrations from the housing to the PCB.
Innovation Solution
A vibration damper system, comprising a tuned mass damper and a feedback control loop, is mechanically coupled to the PCB to provide a counterforce that actively or passively dampens vibrations, decoupling the PCB from the housing and reducing resonance-induced vibrations by oscillating out of phase with the PCB.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If additional fixation screws or fixation islands are added to increase PCB stiffness, then PCB fixation to housing is improved, but mode shapes of PCB and housing overlap inducing vibrations from housing to PCB
Solution Approach 1:
The patent introduces a vibration damper as an intermediary element between the PCB and housing. This damper absorbs and dissipates vibrational energy, preventing the transmission of vibrations from the housing to the PCB while maintaining the fixation connection. The damper acts as a mediator that decouples the harmful vibration transmission path while preserving the mechanical attachment.
Solution Approach 2:
The patent modifies the dynamic characteristics of the fixation system by changing the stiffness and damping parameters. Instead of simply increasing fixation stiffness which causes mode shape overlap, the system adjusts the overall dynamic parameters by adding damping elements, thereby changing the resonant frequencies and mode shapes to avoid overlap between PCB and housing vibrations.
2Object-affected harmful factors
If PCB stiffness is increased to reduce vibration displacement, then vibration displacement is reduced, but resonance frequencies increase causing mode shape overlap with housing
Solution Approach 1:
The patent employs composite damping structures that combine different material properties. The vibration damper uses composite material configurations (such as viscoelastic materials combined with structural layers) to achieve both vibration reduction and stable mode shapes. This composite approach allows simultaneous optimization of vibration displacement reduction and mode shape stability without the trade-off present in homogeneous stiffening approaches.
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 vibration damper system effectively reduces PCB vibrations, enhancing the reliability of ECUs by protecting electronic components from damage and improving operational reliability, while allowing for precise control of vibration suppression.
Implementation Method 1
A vibration damper system, comprising a tuned mass damper and a feedback control loop, is mechanically coupled to the PCB to provide a counterforce that actively or passively dampens vibrations
Implementation Method 2
configured for providing a counterforce for damping a vibration of the circuit board
Data Source
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AI summary
Arrangement (100), comprising a circuit board (102) for an automotive application in a vibrating environment, and a vibration damper (104) mechanically coupled to the circuit board (102) and configured for providing a counterforce for damping a vibration of the circuit board (102) in the vibrating environment.