Electronic Circuit Board Handle Prolonged Exposure to Vibration
Electronic circuit board are used in a range of devices, from small toys to spacecraft. They are often exposed to vibration, which can cause damage to components, reduce their lifespan or even cause the device to fail.
Prolonged exposure to vibration can also lead to fatigue, which causes the components on the electronic circuit board to weaken over time. This can result in short circuits, damaged interconnections or poor signal transmission. This is one of the main reasons why the PCBs that ABL Circuits produces are designed to be as resilient as possible.
The vibration frequencies in aerospace systems can range from 3 to 5000Hz, with acceleration levels up to 30G. In order to withstand these vibrations, the electronics on the aircraft or missile must be protected. This is achieved by using various methods such as bulky mounting fixtures, reinforcing ribs or passive vibration damping mounts. However, these measures add to the weight of the system, affecting its price and performance.
How Do Electronic Circuit Board Handle Prolonged Exposure to Vibration?
Ruggedized communication systems are specialized military electronics that must be able to operate reliably in harsh environments, including vibrations and high temperatures. These systems are required to provide critical data and communications for defense personnel. They must also be able to withstand shocks, abrasions and humidity, making them ideal for use in extreme conditions.
To ensure the reliability of their equipment, manufacturers must test the performance of their products under various environmental conditions. This includes temperature and vibrations, which can cause the metal components on a printed circuit board to deform or lose their connections. The effects of these vibrations can be felt at a very low frequency, making them difficult to detect.
Another factor that can affect the durability of a circuit board is the presence of water, which can seep into the device and cause corrosion or oxidation over time. This is particularly problematic for PCBs in marine applications, where the board must be able to withstand saltwater exposure.
Finally, a circuit board may suffer from electromagnetic interference (EMI). EMI is caused by the difference in potential between two charged conductors and can be caused by current flowing through the dielectric. It can be reduced by shielding cables, minimizing the length of the return path and using bypass capacitors to prevent capacitive coupling between adjacent ground planes.
EMI can be caused by both human-made and naturally occurring sources, with continuous interference resulting from constant signals such as radio and clocks and impulse interference arising from intermittent sources like lightning or switching systems. Proper EMC design can minimize EMI by eliminating unnecessary loops and shorting out the return paths of high-speed signals. It is also important to keep high-speed signals as short as possible and adjacent to the ground plane to avoid cross-talk, noise and radiation. Adding bypass or decoupling capacitors can further reduce EMI.
