Protoless Design

Protoless Design: Vehicle Development Without Prototypes

A CAE-based development process that validates the whole vehicle in simulation — before a single prototype is built.

The problem with hardware-first development

Conventional development validates with hardware. Each design change discovered at prototype stage costs far more than one caught at concept stage — and prototypes arrive late by definition.

Protoless inverts the order. The vehicle is designed and validated top-down in simulation, so the expensive changes happen while they are still cheap.

Approach

Three approaches compared

	Conventional	Front-Loading	VTX Protoless
Basis	Hardware test	CAD	CAE
Direction	Bottom-up	Bottom-up	Top-down
Initial data	CAD	CAD	Polygon (a fraction of CAD volume)
Analysis setup	Manual	Manual	Automated
Optimization	Commercial solver	Commercial solver	In-house MDO
Prototype fleet	Required	Required	Not required

What Protoless does not skip

Protoless does not mean skipping validation. Every gate of the standard development process remains. What changes is the medium: database, automation, optimization, and virtualization replace physical iteration.

One real program

The full process, on a single EV truck

One 0.5-ton EV truck program runs the complete Protoless process from body structure through test driving. The same six steps apply to every program VTX develops.

01/ 06

Structure Optimization

Global and local stiffness and strength analysis for a new body structure.

Global and local stiffness analysis screens and strength analysis of the EV truck frame — Stiffness and strength performance of the BIW is optimally designed for a new body structure.

02/ 06

Crash Optimization

Full frontal, offset, rear, side, roof crush, and seatbelt anchorage.

Six crash simulation cases: full frontal, offset frontal, rear, side, roof crush, and seatbelt anchorage — Crash performance of the full vehicle is optimized to meet challenging safety goals.

03/ 06

Dynamic Optimization

Steering and suspension K&C, plus full-vehicle dynamics — double lane change and fishhook.

Steering and suspension K&C analysis and full-vehicle dynamics simulations — Dynamic performance is virtually analyzed for the new EV design.

04/ 06

CAD Export for Manufacturing

System concept sheets to production CAD, extracted from the final FE model.

System concept sheets and production CAD drawings extracted from the FE model — Based on the final designed FE model, the final CAD data is extracted to build the vehicle.

05/ 06

Building the Vehicle

Parts sourcing, simultaneous engineering, and an optimized assembly process.

Step-by-step assembly sequence of the EV truck from bare frame to finished vehicle — After parts sourcing and SE, the vehicle is built following its optimized assembly process.

06/ 06

Test Driving

Virtual driving and actual test driving, side by side.

Virtual driving simulation of the EV truck on a rendered road — The real test driving verifies actual performance in the field against the virtual prediction.

Actual test driving of the EV truck on a public road — The real test driving verifies actual performance in the field against the virtual prediction.

Why the last step matters

Placing the virtual prediction next to the real test drive is the strongest evidence a simulation-based developer can offer: the vehicle was designed in CAE, and a real one drives. The 0.5-ton EV truck above is detailed further on Recent EV Developments.

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