I want to implement a control system I designed for a light electric motorbike. I would like to mount it as professionally as possible on the chassis. It consists of a power system pcb and a SAMC21 development board which I'll merge later once this all works properly. I have tried screwing it directly on the aluminium chassis but have found that shocks and vibrations from the horn disturbed the system or even destroyed it upon large shocks like a few hammer hits. Is there a specific way car and motorcycle manufacturers mount their electronics to make their system as robust as possible?
Thank you for your help!
Electronic – How to mount electronics on a vehicle chassis safely
control systemembeddedmicrophonicsmotormount
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Best Answer
Avoid ceramic capacitors and ceramic components for applications under environmental conditions that include vibrations and shocks. If you can't avoid them, choose components that use materials or constructions techniques targeted to minimise the so-called "microphonics". Also, use microphonics minimisation design strategies on your own.
Microphonics is an unwanted behavior due to the piezoelectric effect of ceramic materials. Usually, it will manifest itself as spurious voltage burst when the component is subject to mechanical vibrations or shocks. Obviously, it can wreak havoc in your circuit, upsetting digital circuits and/or triggering switching in analog circuits.
Apart from microphonics, electromechanical devices (relays, swtches, etc.) can suffer upsetting under vibration/shock.
Also, mechanical stress can dramatically affect reliability and precipitate failures unless the PCB and its enclosure is specifically design to withstand those vibration and shock levels:
All these issues are usually addressed at design level, having the environmental specifications in mind. The specifications drive all the following:
As you can imagine, if you don't address all these things from the beginning, then you can only pray for it to work under vibration/shock and/or try to mitigate it by replacing some parts (ceramics) and trying to reduce the mechanical energy your board is getting.