From Simulation to Space: How TOPU Developed Carbon Fiber Structures for Satellite Optical Payloads

By Huiwen Hu

Case Study: Client Project

Client	Taiwan Space Agency (TASA)
Industry	Aerospace / Satellite Systems
Challenge	Develop a lightweight carbon fiber cylindrical structure for a satellite optical payload while maintaining high strength, stiffness, and dimensional stability under extreme space conditions.
TOPU's Role	Material selection, composite structure design, CAE simulation, simulation-driven optimization, mold design, tooling and manufacturing process development, and experimental validation.
Outcome	Delivered a lightweight, high-stiffness carbon fiber structure validated through CAE simulation and experimental testing, achieving the required structural performance and thermal stability for satellite optical payload applications while reducing development risk and reliance on repeated physical prototyping.

Every kilogram added to a launch vehicle increases launch cost and reduces payload efficiency. Consequently, one of the greatest challenges in aerospace engineering is minimizing structural weight while maintaining exceptional strength, stiffness, and long-term dimensional stability.

Yet achieving lightweight construction is only part of the challenge. Space structures must also withstand intense launch vibration, severe mechanical shock, extreme thermal cycling, and the vacuum environment of space without compromising performance.

These were precisely the engineering challenges TOPU faced while collaborating with the Taiwan Space Agency (TASA) to develop a carbon fiber cylindrical structure for a satellite optical payload.

Space Is Far More Demanding Than It Appears

During launch, satellites are subjected to enormous thrust loads, random vibration, and shock events. Once in orbit, they repeatedly experience extreme thermal cycling as they transition between direct solar radiation and Earth's shadow.

For conventional mechanical structures, small thermal deformations may have limited impact. For optical payloads, however, even microscopic dimensional changes can alter optical alignment, shift focal length, and ultimately degrade image quality and mission accuracy.

Therefore, satellite structural design must simultaneously achieve four critical objectives:

• Lightweight construction

• High stiffness

• High strength

• Exceptional dimensional and thermal stability

  
  

A deficiency in any one of these characteristics can compromise mission success.

Materials Are Only the Beginning:

Engineering Integration Is the Real Challenge

Many assume that high-performance structures can be achieved simply by using carbon fiber. In reality, carbon fiber is only the starting point. Ultimate structural performance depends on the integration of material selection, laminate design, structural analysis, manufacturing process control, and experimental validation.

TOPU selected high-modulus, high-strength carbon fiber prepregs combined with low-moisture-absorption resin systems. Besides reducing structural weight, these materials minimize outgassing in vacuum environments, helping prevent contamination of sensitive optical components.

The engineering team then employed advanced CAE simulation together with simulation-driven optimization to evaluate numerous fiber orientations and laminate stacking sequences, identifying the optimal balance among weight, stiffness, strength, and thermal stability.

This digital engineering approach significantly reduced the time and cost associated with the traditional design–prototype–test–redesign development cycle.

Designing the Structure Before Building It

Rather than relying solely on physical prototypes, TOPU integrated simulation into the design process from the beginning.

Through CAE analysis, the engineering team could evaluate how different material configurations and structural designs would perform under the demanding conditions expected during launch and operation in space.

Simulation-driven optimization allowed the team to identify potential weaknesses and refine the composite structure before committing to final manufacturing.

This approach not only helped optimize the final design, but also reduced the need for repeated physical prototypes and allowed engineering decisions to be made earlier in the development process.

From Design to Manufacturing

A superior design can only become a successful product through robust manufacturing processes.

TOPU developed dedicated tooling for the cylindrical composite structure and implemented a controlled curing process involving elevated temperature, pressure, and vacuum consolidation to ensure uniform curing of the carbon fiber prepreg.

The close integration of design, materials engineering, and manufacturing allowed simulation results to be faithfully translated into the final hardware.

Validation: The Most Critical Step in Engineering

No simulation is complete without experimental verification.

Following prototype fabrication, TOPU performed Experimental Modal Analysis (EMA) together with thermo-mechanical deformation testing to verify that the structure satisfied the Taiwan Space Agency's requirements for natural frequencies, mode shapes, and thermal stability.

These validation results confirmed not only compliance with design specifications, but also a high level of correlation between numerical simulation and experimental performance.

For a satellite optical payload, this correlation is especially important. The structure must behave as predicted, because even small deviations in dimensional stability can affect the performance and accuracy of the optical system.

Digital Engineering Is Transforming Product Development

Across industries, including satellites, unmanned aerial vehicles, electric vehicles, hydrogen energy systems, and advanced medical devices, product development is rapidly evolving from a prototype-driven approach toward a simulation-driven methodology.

Technologies such as artificial intelligence, computer-aided engineering (CAE), multiphysics simulation, composite structure design, and intelligent manufacturing are no longer independent tools. Together, they form an integrated digital engineering workflow that accelerates innovation while reducing technical risk.

Leveraging extensive experience in multidisciplinary engineering integration, TOPU combines materials engineering, structural analysis, simulation-driven optimization, prototype development, and validation testing into a unified product development process.

This enables customers to predict product performance, mitigate engineering risks, and shorten development cycles long before production begins.

As the global space industry continues to expand, true competitive advantage lies not merely in designing a successful product, but in establishing an engineering capability capable of repeatedly delivering high-performance systems.

That philosophy remains at the core of TOPU's continued investment in digital engineering and intelligent design technologies.

The Bottom Line

In satellite engineering, success is determined long before a structure reaches space.

Every material choice, fiber orientation, laminate configuration, manufacturing parameter, and simulation result contributes to whether the final structure can withstand the extreme conditions of launch and orbit.

For optical payloads in particular, lightweight construction is not enough. The structure must remain strong, stiff, and dimensionally stable throughout its mission.

By combining composite materials engineering, simulation-driven optimization, advanced manufacturing, and experimental validation, TOPU helped transform a complex satellite structural challenge into a validated engineering solution.

From simulation to manufacturing and from the laboratory to space, the goal remains the same: design with confidence before the product ever leaves the ground.