Lightweight structures
Drone frame topology optimization — 22% lighter, same stiffness, case study.
An aerial-survey drone needed more flight time without sacrificing payload or stiffness. We ran topology optimization, redesigned the frame in PETG-CF, and verified the result with modal and static FEA — 22% mass off the frame, no compromise on flight stack performance.
By Yantrix Engineering · Mechanical Design Studio2 min readUAV / aerial survey
Overview
Why this study matters
Topology-driven redesign of a survey drone frame in PETG-CF — dropped frame mass by 22% with no loss in stiffness, extending flight time by 6.4 minutes per sortie.
Client: An Indian aerial-survey company operating commercial drones
Project Type: Lightweight Structure Optimization
Industry: UAV / aerial survey
Service Used: Topology Optimization + DfAM
Results in numbers
What the engagement actually shipped.
- 22%
- Frame mass reduction
- 118 Hz
- First natural frequency (≥ 110 Hz target)
- +6.4 min
- Flight time extension per sortie
- 2.4×
- Static safety factor at worst landing
Objectives
What the project needed to achieve
- Reduce frame mass without compromising structural stiffness or natural frequency
- Preserve mounting points for the existing motor, camera gimbal, and avionics
- Make the frame manufacturable on a small print farm (FDM with PETG-CF)
- Verify with modal and static FEA before flight testing
Challenge
Engineering constraint
The client’s survey drone had a 720 mm wheelbase and a 1.85 kg all-up mass, of which the frame was 410 g. They needed an extra 5–10 minutes of flight time per sortie without sacrificing payload, structural stiffness, or vibration characteristics that the flight stack depends on.
Approach
How Yantrix approached the work
- 01Mapped load paths from the four motors and payload through the frame to identify which members carried significant load versus which were structural dead weight.
- 02Ran topology optimization with a target mass-fraction of 60% subject to a worst-case landing load case and a modal-frequency constraint (first natural frequency ≥ 110 Hz).
- 03Translated the topology result into a manufacturable PETG-CF geometry, preserving every existing mounting point and routing channel.
- 04Validated the new frame with static FEA (landing impact, motor torque) and modal FEA, then printed and flight-tested.
Outcomes
What improved by the end
- Frame mass dropped from 410 g to 320 g — 22% reduction
- First natural frequency held at 118 Hz (target 110 Hz)
- Static safety factor maintained at 2.4 under worst-case landing impact
- Per-sortie flight time extended by 6.4 minutes in field testing
Deliverables
What the client receives
- Topology-optimized frame CAD (SolidWorks + STEP)
- Static and modal FEA reports
- Print parameters and DfAM notes for PETG-CF
- Flight-test plan and field-validation report
Tools used
Stack and tooling
- Altair Inspire (topology optimization)
- ANSYS Mechanical (static and modal FEA)
- SolidWorks for the manufacturable geometry
- Bambu X1C printing in PETG-CF
Impact
Business-level effect
- More billable flight time per battery cycle for the survey crew
- Lower frame mass also reduced motor current draw, extending motor and ESC life
- Replicable workflow for the client’s next drone platform
Conclusion
Lightweighting isn’t about cutting material everywhere — it’s about identifying which members carry load and removing the rest. Topology optimization plus modal FEA is the engineering loop that gets you there honestly.
Next step
Drone, robotic, or product frame where every gram matters? Let’s scope a topology-optimization pass before your next prototype iteration.
Tagged
- Topology Optimization
- Drone Frame
- Lightweighting
- PETG-CF
- Modal FEA
- DfAM
Visual results
Key views and intermediate artefacts
Manufacturable PETG-CF redesign
Frequently asked questions
Answers from the engagement itself.
How much mass can topology optimization realistically remove?
20–30% from a frame that started credible, more from over-engineered baselines. The hard part isn’t the algorithm — it’s translating the topology output into a manufacturable, serviceable geometry that preserves mounting points and cable routing.
Why PETG-CF instead of pure carbon-fibre layup?
Iteration speed. PETG-CF parts print overnight on a print farm; carbon-fibre layup is a weeks-per-revision proposition. For prototype iteration cycles where the geometry is still moving, PETG-CF gets you 80% of the strength at 5% of the lead time.
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