Aircraft Surface P-Static Zoning Using CFD Charging Profiles

Solution Overview

Problem

Aircraft p-static charging is non-uniform, leading to overly conservative design guidelines and increased costs due to treating the entire aircraft as a worst-case scenario, despite the fact that charging varies by location.

Innovation Solution

Discretize the aircraft surface into p-static zones using computational fluid dynamics to model particle impingement and precipitation charging profiles, applying unbonded conductive materials and dielectric materials based on zone-specific design guidelines.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the entire aircraft surface is treated as a worst-case scenario for p-static charging, then safety and reliability are improved, but manufacturing cost and design complexity increase due to overly conservative material application

Engineering Contradiction:

Improvep-static performanceVSAvoiddesign complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The aircraft surface is divided into multiple p-static zones based on particle impingement models and charging profiles. Each zone is assigned different design guidelines and material requirements according to its specific charging characteristics, rather than treating the entire surface uniformly. This segmentation allows targeted application of unbonded conductive materials and dielectric materials only where necessary.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different p-static zones receive different levels of protection and material application based on their local charging risks. High-charging zones receive more stringent treatment with specific material requirements, while low-charging zones receive reduced or no material application. This local quality approach optimizes both safety and cost by applying materials only where they are truly needed.

Inventive Principle:

Principle #3Local quality

2Reliability

If the entire aircraft surface is treated as a worst-case scenario for p-static charging, then safety and reliability are improved, but manufacturing cost increases due to excessive material application

Engineering Contradiction:

Improvep-static performanceVSAvoidmanufacturing cost

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The aircraft surface is divided into multiple p-static zones based on particle impingement models and charging profiles. Each zone is assigned different design guidelines and material requirements according to its specific charging characteristics, rather than treating the entire surface uniformly. This segmentation allows targeted application of unbonded conductive materials and dielectric materials only where necessary.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different p-static zones receive different levels of protection and material application based on their local charging risks. High-charging zones receive more stringent treatment with specific material requirements, while low-charging zones receive reduced or no material application. This local quality approach optimizes both safety and cost by applying materials only where they are truly needed.

Inventive Principle:

Principle #3Local quality

3Ease of operation

If uniform p-static design guidelines are applied across the entire aircraft surface, then consistency and ease of operation are improved, but manufacturing precision and optimization are worsened due to inability to account for location-specific charging variations

Engineering Contradiction:

Improvedesign guideline consistencyVSAvoidmaterial application precision

Core Design Contradiction:

Ease of operationVSManufacturing precision

Solution Approach 1:

The aircraft surface is divided into multiple p-static zones based on particle impingement models and charging profiles. Each zone is assigned different design guidelines and material requirements according to its specific charging characteristics, rather than treating the entire surface uniformly. This segmentation allows targeted application of unbonded conductive materials and dielectric materials only where necessary.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different p-static zones receive different levels of protection and material application based on their local charging risks. High-charging zones receive more stringent treatment with specific material requirements, while low-charging zones receive reduced or no material application. This local quality approach optimizes both safety and cost by applying materials only where they are truly needed.

Inventive Principle:

Principle #3Local quality

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

Reduces p-static interference risks by optimizing material application, leading to cost savings and improved communication and navigation system performance.

Implementation Method 1

Impingement of particles transfers charge at the point of impact on the aircraft exterior

Methodology Applied

Scientific EffectParticle impingement: Impact Force

Implementation Method 2

Precipitation static (p-static) refers to electrostatic charging of aircraft surfaces due to collision with particles during flight

Methodology Applied

Scientific EffectPrecipitation charging: Electrostatics

Implementation Method 3

unbonded conductive materials and/or dielectric materials are then applied to the aircraft surface based on the p-static design guidelines

Methodology Applied

Scientific EffectConductive material application: Conduction (electrical)

Implementation Method 4

unbonded conductive materials and/or dielectric materials are then applied to the aircraft surface based on the p-static design guidelines

Methodology Applied

Scientific EffectDielectric material application: Dielectric

Data Source

PatentUS20250378244A1Discretizing an aircraft surface into p-static zones

Publication Date: 2025.12.11 THE BOEING CO

AI summary

A method is presented for discretizing an aircraft surface into p-static zones. The method comprises generating a particle impingement model for an aircraft surface using computational fluid dynamics. The particle impingement model is discretized to generate two or more p-static zones. P-static design guidelines are established on a per p-static zone basis. Unbonded conductive material and/or dielectric material is then applied to the aircraft surface based on the p-static design guidelines.