Aerospace PCB Manufacturing
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2023-01-03 17:19:29 Aerospace PCB 116 Viewed
SummaryAerospace PCBs for aircraft have more complex designs that are invented to comply with the ever-increasing aircraft functions. Designing an aerospace PCB is not easy. The aerospace field will use a large number of aerospace PCB boards. Since aerospace equipment may frequently face harsh environments...
Aerospace PCBs for aircraft have more complex designs that are invented to comply with the ever-increasing aircraft functions. Designing an aerospace PCB is not easy. The aerospace field will use a large number of aerospace PCB. Since aerospace equipment may frequently face harsh environments such as acceleration and weightlessness, the quality of aerospace PCBs is very important. The role of high-precision aerospace PCB testing solutions and testing equipment for aerospace electronic products is self-evident.
Aerospace PCB Design
The origin of avionics can be traced back to the 1970s. After years of development, avionics have been widely used in aircraft on-board system equipment. Typical representatives include integrated modular avionics systems, fly-by-wire flight control systems, and engine control units. Different types of aerospace PCBs endow aerospace equipment with diverse functions.
For starters, the design of aerospace PCBs has to be much more robust, which requires implementing specific layout and design techniques. Making circuit boards for aircraft is a difficult and time-consuming task. Special attention is paid to thermal management of aerospace PCBs, taking into account special design and layout techniques for high frequency RF components. Therefore, in order to manufacture aerospace PCBs for aerospace equipment, the basic design and layout must be considered to make them superior.
This means that designers must define the correct aerospace PCB material, specify accurate drilling charts, maintain neat assembly considerations, keep stackup recommendations for layout of aerospace PCBs, add extra pads for mechanical dimensions and holes, use proper termination method and perform pre-layout simulations. Designers of aerospace PCBs must also verify impedance calculations, shield signals, separate ground planes and power supplies, and then maintain the correct aspect ratio.
Aerospace PCB Layout
Safety and reliability are the core requirements of aerospace electronic equipment, and any small failure may cause a huge accident. When designing aerospace PCBs, the priority is not the top technology, but the most stable, mature, and reliable design.
Other requirements for aerospace PCB designers to consider include aerospace PCBs should be designed with extra current buffer pads and also use correct milling cutter specification components. This is indeed a demanding process. MIL-SPEC components are primarily used in aerospace PCB designs because they have very tight tolerances and use additional current snubbing to enhance current flow in the circuit.
Aerospace PCBs must withstand extreme environmental tolerances and provide increased reliability. Several aerospace PCB manufacturers are working to improve their manufacturing equipment and manufacturing expertise to meet the changing needs of the aerospace industry. Furthermore, aerospace PCBs have a life expectancy of more than 10-15 years. These aerospace PCBs must be able to withstand harsh external conditions such as extreme temperature, humidity and vibration. In addition, harsh environmental conditions may occur, including salt spray, blowing sand and solar radiation.
Aerospace PCB Testing
Due to the sensitive nature of the components found in aircraft, aerospace PCB applications are made with circuits that properly handle three amps. Why? Aerospace PCBs only require a maximum load of two amps. So three amp circuits can handle important applications in aerospace PCBs. The extra headroom handles everything with ease in case of unusual or excessive peaks. All of these designs and layouts play a key role in making aerospace PCBs more robust and efficient.
Aerospace electronic equipment generally has a long life cycle. Therefore, when manufacturing aerospace PCBs, it is important to ensure that each process is standardized and repeatable. Every manufacturing process must have strict quality control and testing. The test items and test requirements of aerospace PCBs are much stricter than those of civilian consumer electronics products, and must meet the relevant standards of aerospace electronics. Aerospace PCB testing is difficult, mainly in the following aspects:
1. High cost of testing and lack of testing technology
Aerospace PCB testing equipment and installation costs are expensive, and a large amount of data support is required, and most avionics equipment has conformal coatings, which makes it difficult to provide stable test node access and test results. Conventional testing methods for aerospace PCBs are difficult to adapt to various high difficulty testing diagnostic needs.
2. There are many types of aerospace electronic equipment, and test instruments need to be customized.
There are many types of aerospace PCBs used in aerospace electronic equipment, such as: on-board computers, displays, radios, communications, radio frequencies, power modules, radars, LED lighting systems, etc., each aerospace PCB testing requirements and testing schemes have significant The difference is that only customized test equipment and solutions can meet the test requirements.
3. Aerospace PCBs are mostly analog-digital hybrids, which are difficult to test and diagnose.
There are mainly non-deterministic test generation and deterministic test generation methods for aerospace PCB to obtain digital system test sets. Non-deterministic generation algorithms refer to artificial test generation. Deterministic test generation uses test generation algorithms to automatically derive test vectors for digital circuits. The testing and diagnosis of analog circuits in aerospace PCBs is far more difficult than digital systems, and neither theory nor testing methods are fully mature, and the mixture of analog and digital further increases the difficulty of testing aerospace PCBs.
Although complicated aerospace PCB testing will increase the cost of research and development and production of avionics equipment, this investment is also conducive to reducing the maintenance cost of aviation equipment and ensuring the product quality of aerospace PCBs.
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