Endego

24/08/2026

The HVAC engineer calculates airflow. Reality is airflow with passengers, sun on one side, and doors opening every 30 seconds.

An electric bus loses range not only to heating - but to a poorly optimised HVAC.

Classic design error: assuming a uniform temperature distribution in the cabin. Reality: dead zones (zero-flow regions), uneven air distribution, overheating above the driver's seat.

How we analyse it at Endego CAE - https://endego.com/competences/cae/ - a CFD simulation of the full cabin with heat-source distribution (passengers, sun, electronics), the air outlets and their directionality, and boundary conditions for cold/warm weather.

The result: temperature and air-velocity maps at every point. We find dead zones, diffuser turbulence that raises noise, and thermal bridges. In one bus project, changing the diffuser angle by 15° and relocating one outlet cut HVAC power demand by 18%. Over a 12-year service life, that's real money.

METHOD & TOOLS

⏺︎ CFD - viscous, turbulent flow

⏺︎ Coupled thermal-flow analysis (CHT)

⏺︎ Passenger thermal-comfort models (PMV/PPD)

⏺︎ Zero-flow detection and diffuser optimisation

In your electric bus/tram projects, is HVAC verified by simulation before the prototype?

19/08/2026

A prototype is an expensive place to discover a structural problem.

That sounds obvious. In practice, it still happens surprisingly often - not because the analysis is missing, but because it enters the process too late.

When CAE starts after the geometry is effectively frozen, the analyst can confirm whether the structure works. But there is much less room left to improve it.

The more useful question is therefore not: “Can we validate this design?”

It is: “What do we need to understand before this design becomes difficult to change?”

For rolling stock, that means looking early at the complete validation picture: load cases, fatigue, crashworthiness, welded and bolted joints, mounting points and - critically - the interfaces between subsystems.

A local reinforcement may solve one issue and create another. A component can pass its own calculation while the surrounding structure remains critical. And a technically correct FEM model is only valuable if its assumptions, boundary conditions and configuration match the vehicle that will actually be built.

Simulation will not eliminate physical testing. Nor should it.

Its real value is to move engineering decisions forward - to a point where there are still several good options available.

That is the subject of our latest article: How Rolling Stock OEMs Can Reduce Prototype Risk with CAE: https://endego.com/blog/rolling-stock-cae-reduce-prototype-risk/

If you are currently working on a new vehicle programme, a modernisation or a validation bottleneck, this is also the kind of technical discussion we are interested in having at InnoTrans 2026.

Learn how CAE and FEM analysis help rolling stock OEMs identify structural risks earlier, reduce prototype iterations and prepare stronger validation evidence.

17/08/2026

An electrical failure caused by a cracked cable clip isn't an electrical failure. It's a mechanical one - and it's predictable.

A modern car carries 2 - 4 km of wiring. Each run is fixed at defined points. Between the fixings the cable hangs free - like a string. And like a string, it has its own natural frequency.

The problem appears when that frequency overlaps the excitation range of the engine, suspension or driveline. Forced vibration + resonance = rapid material fatigue at the fixing points.

How we analyse it at Endego CAE: https://endego.com/competences/cae/, we build a 3D FE model of the cable guide accounting for the clip material, the fixing stiffness and the route geometry between clips. Then we run a PSD (Power Spectral Density) analysis - forced vibration from the real road-profile spectrum.

The result: an RMS stress map across the whole frequency range. We see exactly where the clip is overloaded and at which frequencies.

METHOD & TOOLS

⏺︎ Modal analysis (natural frequencies and mode shapes)

⏺︎ Harmonic and PSD (power spectral density) analysis

⏺︎ RMS stress vs. frequency

⏺︎ Optimisation of fixing-point layout

Is cable routing in your projects validated dynamically, or only geometrically (clearance check)?

12/08/2026

Failure in service isn't bad luck. More often than not, it's the absence of analysis at the design stage.

Simulation lets you predict three kinds of failure:

→ Static failure: yield or ultimate strength exceeded under a single extreme load (crash, impact, overload).

→ Fatigue failure: cracking after repeated load cycles - even below the elastic limit. This is what kills welds in rolling stock and joints in suspension systems.

→ Loss of stability (buckling): sudden collapse of a slender element under compression - without warning.

At Endego CAE: https://endego.com/competences/cae/, every structural analysis checks all three. We don't pick one - because the structure doesn't either.

A real case: a marine client needed a housing verified against shock pulses per BV-0430. The analysis showed the absorbers met the shock criterion but exceeded the allowable natural-vibration level. The fix: rearranging and re-selecting the absorbers - without changing the housing envelope.

The client received technical documentation accepted by the certifying body. No rework after certification.

Which failure mode is hardest to predict without simulation in your projects?

10/08/2026

Every kilogram of excess mass is a cost - in fuel, in emissions, and in the wear of every other part.

Classic approach: “it holds with margin - leave it.”

Engineering approach backed by CAE: “where exactly is that margin, and how much can we take?”

Topology optimization in FEA works like sculpting from inside the material: you define the design space and boundary conditions (forces, fixings); the algorithm iteratively removes material where stresses are low; you're left with an optimal structure - biologically close to bone, mathematically close to ideal.

We do this regularly for automotive (lightweight brackets, BEV mounting plates), rail (ceiling gondolas) and defence (electronics housings).

In one project an aluminium EV battery frame was 22% heavier than it needed to be. The FE model showed it. The client approved the lighter version before production.

20–30% mass reduction with full strength retained - not a slogan. A calculated result you can show.

Is mass optimization a design criterion from day one for you, or only when someone forces it?

Visit our website for more: https://endego.com/competences/cae/

04/08/2026

A powerful motor is not enough. The success of an e-drive depends on the entire system.

The efficiency, range, and reliability of an electric vehicle are not determined by motor performance alone.

What really matters is how all components work together:

• the motor and inverter,

• the battery and BMS,

• the transmission and cooling system,

• the control software,

• the high-voltage architecture,

• the vehicle’s mechanical design.

Even the most advanced motor will not reach its full potential if the battery cannot deliver sufficient power, the gear ratio forces it to operate outside its optimal range, or the cooling system limits performance too quickly.

That is why e-drive development should begin with an analysis of the vehicle’s real operating profile - including loads, driving cycles, temperatures, road gradients, and operating conditions - rather than simply selecting the component with the highest rated power.

A system-level approach helps identify design conflicts earlier, reduce energy losses, and minimise the risk of costly changes during prototyping and validation.

How can you design an efficient and reliable electric drive system?

👉 Read the latest article on the Endego blog:

An electric motor is only one component of a vehicle’s e-drive system. Efficiency, range, performance and durability depend on the combined operation of the motor, inverter, battery, battery management system (BMS), cooling system, transmission, control software and mechanical integration. Electri...

04/08/2026

Retro-futurism connects automotive heritage with the technology of tomorrow.

For Damian Ignasiak, Competence Centre Director at Endego and a passionate classic car enthusiast, this idea is especially close to heart.

Icons such as the Renault 5, Volkswagen ID. Buzz, MINI and Alfa Romeo 33 Stradale show how modern engineering can preserve the soul of classic design.

At Endego, we combine emotion, heritage and innovation to create future-ready automotive solutions.

Is this a celebration of automotive history or a clever play on nostalgia?

28/07/2026

A hybrid powertrain is not automatically a compromise. A poorly integrated one is.

The real engineering challenge is not simply combining an internal combustion engine with an electric motor. It is making the battery, power electronics, transmission, thermal systems and control software operate as one coordinated system.

MHEV, HEV and PHEV architectures offer different levels of electrification - and each affects vehicle weight, packaging, cost, NVH, homologation, service strategy and platform development. The right solution depends on the vehicle’s duty cycle, operating conditions and business objectives.

Effective torque blending, energy management and thermal control determine whether the hybrid system delivers measurable benefits or merely adds complexity. Validation must therefore examine interactions between systems - from cold starts and regenerative braking to charging, battery degradation and fault scenarios.

In our latest article, we examine when hybrid powertrains make sense, how MHEV, HEV and PHEV architectures differ, and why system-level engineering is critical to their performance.

👉 Read the full article on the Endego blog:

Hybrid powertrains can be a viable direction for automotive development, not merely a transitional compromise between internal combustion engines and battery electric vehicles. Automotive electrification does not follow a single, straightforward path.

21/07/2026

More kWh. More range. Better EV? Not necessarily.

An EV battery is much more than a number expressed in kWh.
It directly affects the vehicle’s range, safety, weight, service life and total operating cost. But capacity alone does not determine how the battery will perform in real-world conditions..

Actual performance depends on the entire system - including:

👉 battery pack architecture and weight

👉 thermal management

👉 Battery Management System strategy

👉 vehicle duty cycle and operating conditions

👉 integration with mechanical, electrical and software systems

👉 testing and validation throughout development

A battery designed for a passenger car will face different requirements than one used in a city bus, commercial vehicle, train or off-highway machine.

That is why battery development must begin with a clear understanding of the vehicle’s application, load profile, charging strategy and availability targets.

In our latest article, we explain how battery-related decisions influence vehicle architecture, safety and programme profitability - and why identifying potential issues early can significantly reduce the cost of later design changes.

👉 Read the full article on the Endego blog:

The battery in an electric vehicle affects not only range, but also safety, weight, service life and total operating costs. It is therefore not merely an energy storage device, but one of the vehicle’s most important systems.

20/07/2026

Endego sharpens its focus on Engineering and Digitalization Services.

Endego, a portfolio company of Abris Capital Partners, has completed the sale of its Siemens and Altair software distribution business to Volupe Group - a European provider of CAE and engineering simulation software and a software partner of Siemens and Altair.

The transaction forms part of Endego’s long-term strategy and enables us to concentrate our resources, investments and organizational development on delivering customer-specific solutions for clients in the mobility and industrial sectors.

We continue to support customers throughout the full product development lifecycle - from concept development and design, through simulation and validation, to industrialization and production support.

Our integrated capabilities include mechanical engineering, electrical and electronics engineering, software and hardware development, virtual validation, CAE, CFD, project management, production support and industrialization.

As the mobility and industrial sectors undergo rapid transformation driven by electrification, connectivity, increasingly software-defined products and AI, we will continue to strengthen the core engineering capabilities that create long-term value for our customers. E-mobility and connectivity will remain important areas for the continued development of our expertise.

The transaction relates exclusively to Endego’s software distribution activities. Endego continues to deliver engineering projects across a broad range of industrial sectors.

Should you have any questions regarding this change, please contact the Endego team directly.

More information about the transaction can be found here: https://endego.com/blog/endego-sharpens-focus-on-engineering-and-digitalization-services/