Fatigue Damage Spectrum Synthesis

FDSynth

Accelerated durability test synthesis from real-world vibration data

Convert multi-channel acceleration time histories into shaker-ready PSD profiles while preserving fatigue damage equivalence across mission life and lab duration targets.

Mission life + duty-cycle controlPSD / FDS / ERS outputsTime- and frequency-domain fatiguePer-channel shaker durationProject + session traceability

Why It Matters

Field data is rich. Lab time is scarce.

Durability teams must compress months of real-world vibration into hours of shaker time without losing damage equivalence or traceability.

Mission profiles include multiple events and duty cycles that must sum to 100%.

Manual PSD shaping can over-test or under-test components.

Time- and frequency-domain methods are often split across tools.

Per-channel lab durations are hard to manage across large file sets.

Without consistent exports, correlation and audit evidence is difficult.

Workflow

From field recordings to shaker-ready PSD

Define mission life, compute damage, synthesize the lab profile.

FDSynth orchestrates PSD, FDS, ERS, and synthesis for each channel using mission targets, duty cycles, and lab duration constraints.

Import multi-channel acceleration files (CSV/TXT) with consistent headers.

Assign Event IDs and duty-cycle percentages; set mission life targets.

Select channels and set shaker duration per channel.

Apply signal conditioning (DC removal, HP/LP, windowing, detrend, PSD crop).

Compute PSD, FDS, and ERS, then synthesize a damage-equivalent PSD.

Export PSD/FDS/ERS curves, shaker statistics, and full session/project files.

Outcome:Damage-equivalent test profiles you can justify, repeat, and export.

Core Capabilities

Built for Durability Test Synthesis

Focused engineering tools for mission-based vibration test design.

Mission Profile & Duty Cycles

Assign Event IDs, enforce duty cycles, and share event time across recordings.

Multi-Channel Time Histories

Import CSV/TXT acceleration files with consistent headers and sampling metadata.

PSD / FDS / ERS Engine

Compute PSD, FDS, and ERS with linear spacing and Nyquist-aware limits.

Signal Conditioning

DC removal, HP/LP filters, windowing, detrend, Welch overlap, and PSD crop.

Damage-Equivalent Synthesis

Iterate PSD synthesis to hit target fatigue damage within lab duration.

Time- & Frequency-Domain Fatigue

Rainflow time history or PSD damage with S-N slope, ref load/cycles, and Q-factor.

Results Viewer & Overlay Tools

Interactive plots for PSD/FDS/ERS plus overlays and comparison views.

Project Outputs & Exports

CSV/PNG exports, shaker stats (Grms, velocity, displacement), and session capture.

Use Cases

Typical applications for durability, validation, and test teams.

Accelerated component validation and shaker test planning
Field-to-lab correlation for vibration environments
Compare profiles across test campaigns or suppliers
Requirement compliance with damage equivalence evidence
Optimize lab duration vs mission life targets
Multi-channel durability assessment for assemblies

Outputs & Reliability

Deliverables and guardrails that make test decisions defensible.

Shorter Lab Time

Compress mission life into hours while preserving damage targets per channel.

Traceable Projects

Project folders, session JSON, and history logs keep outputs reproducible.

Damage Equivalence Checks

Target vs synthesized FDS comparison, ERS plots, and shaker statistics.

Ready-to-Share Exports

CSV and plot exports for reports, lab setup, and supplier reviews.

Methods & Technical Depth

Engineering assumptions made explicit

Switch between time-domain rainflow and frequency-domain PSD damage, configure S-N slope, reference load/cycles, Q-factor, PSD resolution, Welch overlap, and Nyquist-checked limits.

Data Manager and Mission Profile

Manage multiple files with event IDs, mission profile percentages, and dynamic repetition logic in one interactive workspace before running synthesis.

Plan your next durability test with FDSynth

Share your field data and mission targets. We'll help define a damage-equivalent lab profile with reproducible outputs.