Using NX Automation for Knowledge-Based Engineering (KBE)

Introduction

Modern engineering teams need more than traditional CAD modeling. Many design decisions are based on company standards, engineering rules, product requirements, and previous design knowledge.

Knowledge-Based Engineering (KBE) helps capture this engineering knowledge and use it to drive repeatable design processes.

NX provides knowledge-driven capabilities such as Knowledge Fusion, while NX Open provides APIs for developing automation and customized applications. Together, these technologies can support intelligent and reusable engineering workflows.

What is Knowledge-Based Engineering?

Knowledge-Based Engineering (KBE) is an approach that captures engineering knowledge and design rules and applies them automatically during product development.

Instead of relying entirely on manual decisions, engineers can define rules such as:

• Standard design parameters

• Feature requirements

• Component selection rules

• Manufacturing constraints

• Design validation conditions

• Company-specific engineering standards

The goal is to make engineering knowledge reusable, consistent, and easier to apply.

What is NX Automation?

NX Automation uses NX APIs and automation technologies to interact with NX programmatically.

NX Open provides a common automation framework that can be used to access NX functionality from supported programming environments. It can be used to automate repetitive operations, access model data, and create customized engineering applications.

A simplified workflow is:

Engineering Rule → NX Open / KBE Logic → NX Model → Automated Result

How Does KBE Work with NX Automation?

NX Knowledge Fusion is specifically designed for knowledge-based engineering. It allows designers and developers to create rules that capture design intent and use those rules to drive product design.

NX Open can complement these capabilities by providing programmatic access to NX objects and workflows.

For example:

Input Parameters
↓
Engineering Rules
↓
NX Automation Logic
↓
Feature / Model Creation
↓
Validation
↓
Final Design

This approach can turn engineering standards into repeatable digital workflows.

Why Use NX Automation for KBE?

Combining automation with engineering knowledge can help organizations:

✔ Reduce repetitive design work
✔ Standardize engineering processes
✔ Reuse design knowledge
✔ Improve consistency
✔ Reduce manual errors
✔ Accelerate product development
✔ Create reusable engineering applications

Siemens describes NX knowledge-driven automation as a way to capture, reuse, and consistently apply engineering best practices.

Tools and Technologies

A typical NX KBE automation environment may include:

Siemens NX

The primary CAD environment where the digital product is created and modified.

NX Open

Used to develop custom automation applications and access NX functionality programmatically.

Knowledge Fusion

A dedicated NX KBE technology for creating engineering rules and capturing design intent.

Engineering Rules

Rules define how design parameters, features, components, and validation requirements should behave.

Reusable Templates and Features

Standardized design elements can be reused across different projects and product variants.

Step-by-Step KBE Automation Workflow

Step 1: Identify Engineering Knowledge

Start by identifying decisions that engineers repeatedly make.

For example:

• Hole diameter selection

• Wall thickness requirements

• Standard component selection

• Feature dimensions

• Material-dependent parameters

Step 2: Convert Knowledge into Rules

Convert the engineering decisions into clear rules.

For example:

IF component type = A
THEN use parameter set A

This makes design intent easier to apply consistently.

Step 3: Connect Rules with NX

Use appropriate NX knowledge-based capabilities and automation APIs to connect the rules with the digital model.

Knowledge Fusion can be used to create rules that drive NX design behavior.

Step 4: Automate the Workflow

NX Open can be used to automate supporting operations such as:

• Reading model parameters

• Accessing NX objects

• Updating attributes

• Creating or modifying features

• Performing checks

• Generating engineering information

Step 5: Validate the Result

The automated workflow should check whether the resulting model satisfies the defined engineering requirements.

NX also provides rule-driven validation capabilities that can help check designs against engineering criteria and standards.

Step 6: Reuse the Solution

Once the workflow has been tested, it can be reused across similar products and projects.

This is where KBE provides significant value: the engineering knowledge becomes part of a repeatable digital process rather than remaining only in individual engineers' experience.

Simple Example

Consider a company designing a family of similar brackets.

The manual process may involve:

Select bracket type → Calculate dimensions → Create features → Check standards → Update model

A KBE-enabled workflow can become:

Select bracket type → Enter requirements → Apply engineering rules → Generate/update model → Validate

The same engineering logic can then be reused for different bracket variants.

Real-World Applications

NX KBE and automation can support applications such as:

• Automotive component design

• Aerospace structural design

• Standardized part generation

• Product variant configuration

• Design-rule checking

• Feature automation

• Engineering validation

• Reusable design templates

• Manufacturing-driven design rules

Knowledge Fusion can also be used with User Defined Features to attach engineering rules to reusable design elements and control their behavior based on model conditions.

Best Practices

For successful NX KBE automation:

• Start with simple engineering rules

• Document the design knowledge before automating it

• Separate engineering rules from application logic where practical

• Use reusable features and templates

• Add validation checks

• Test rules with multiple design variants

• Avoid unnecessary automation complexity

• Make automated decisions transparent to engineers

• Continuously update rules as engineering standards change

Benefits of Knowledge-Based NX Automation

Faster Design

Automated rules can reduce repetitive decision-making and modeling activities.

Consistent Design

The same engineering rules can be applied across multiple projects.

Reusable Knowledge

Engineering expertise can be converted into reusable digital rules.

Reduced Manual Work

Automation handles repetitive operations so engineers can focus on higher-value design activities.

Standardized Workflows

Company standards and design practices can be incorporated into repeatable processes.

Siemens notes that engineering automation can improve efficiency, reduce errors, and help engineers spend more time on higher-value engineering activities.

From NX Automation to Intelligent Engineering

The combination of NX Open + Knowledge Fusion + Engineering Rules + Reusable Design Elements creates a foundation for knowledge-driven CAD automation.

A typical progression can be:

NX Fundamentals
↓
NX Expressions & Rules
↓
NX Automation / NX Open
↓
Knowledge-Based Engineering
↓
Reusable Engineering Applications
↓
Advanced CAD Automation

The objective is not simply to automate CAD commands, but to capture why a design should be created in a particular way and turn that knowledge into a reusable engineering process.

Conclusion

Knowledge-Based Engineering transforms engineering knowledge into reusable digital intelligence.

With NX, technologies such as Knowledge Fusion can capture design intent and engineering rules, while NX Open can provide the programming foundation for customized automation workflows.

By combining CAD knowledge, engineering rules, and automation, organizations can build standardized workflows that improve consistency, reduce repetitive work, and make valuable engineering knowledge easier to reuse.

The journey is simple:

Engineering Knowledge → Rules → NX Automation → Validation → Reusable Engineering Solution

Contact Us

At Descode Solutions, we specialize in:

✔ NX Automation & Customization Training
✔ NX Open Training
✔ CAD Automation Training
✔ Real-Time Industry Projects
✔ CAD API Development
✔ Engineering Application Development

Learn smarter. Automate faster. Build your career in NX Automation and CAD Customization.

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