PCBA Tech - Effective processing of PCBA model in electronic product analysis

Effective processing of PCBA model in electronic product analysis
A Analyze the background

PCBA is an indispensable component in electronic products. Common processing methods include actual modeling, simplifying electronic components, removing components and leaving only the PCB board, and simplifying it to Point Mass. Choose different methods according to specific applications. Next, the editor mainly talks about how to effectively reduce to quality points.

B Application occasions

1. First of all, actual modeling is basically infeasible. Due to the limitation of computer power, it is difficult to achieve actual modeling. When it is necessary to analyze specific components, this part can be actually modeled, and the other parts are still simplified. Such as fatigue analysis of BGA.

2. Simplify electronic components; often simplify electronic components into regular bodies, and then combine them with PCB to form PCBA. Mainly used in modal analysis and vibration analysis of PCBA.

3. Only the PCB board is reserved; the influence of electronic components is not considered, and only the role of the PCB is considered. It can be used for the pre-tightening force strain analysis and simple thermal strain analysis of the PCB.

4. Simplify to quality point; consider the influence of PCBA weight, not stiffness. It is mainly used in vibration analysis to analyze components whose rigidity is far greater than that of PCBA parts, such as shells and sheet metal, or PCBA rigidity has little effect on them. Such as vibration analysis of sheet metal brackets. However, the center of gravity and moment of inertia of the PCBA need to be considered.

Three quality point simplification steps

1. Preparation: Establish an equivalent material library for large components. Actually measure the weight and calculate the equivalent density in combination with the volume in FEM. And it is best to be able to estimate the overall weight of the PCBA;

2. Delete small components, such as ceramic capacitors, resistors, etc.; and share the topology of PCBA-related components in SCDM;

3. Open the Mechanical module, assign materials, and get the properties of the PCBA component; if the overall quality is different from the actual PCBA, adjust the density of FR-4;

4. Based on the parameters obtained in step 3, create a quality point;

5. Suppress PCBA components.

Four summary

PCBA quality attributes have a great influence on the dynamic characteristics of the overall structure. Simple and comprehensive consideration of the impact of PCBA can more accurately determine the structural performance of the product.