Digital Signal Processing

May 28

Written By Joseph McFadden

Mechanical Dynamics DSP Analyzer

Version 5.1

Professional Shock & Vibration Analysis Software

Beyond Peak Gs — Into Real-World Reliability

The Problem We Solve

Every year, billions of dollars in products are damaged during shipping, handling, and operation due to shock and vibration. Yet most engineers still rely on a single metric — peak acceleration (g) — to predict whether their products will survive.

This approach fails. Here's why:

• A 1,000g shock lasting 0.1 ms may cause zero damage

• A 50g shock lasting 20 ms may cause catastrophic failure

• The same peak g can produce completely different outcomes

"We've seen products pass 100g shock testing in the lab, then fail at 30g in the field. The peak g number told us nothing about the actual failure mechanism." — Common experience in product development

Our Solution: The 5-Parameter Fragility Framework

The Mechanical Dynamics DSP Analyzer implements a comprehensive 5-parameter fragility assessment that considers how products actually fail:

Parameter

Failure Mode

What It Catches

Peak Acceleration

Brittle fracture

Glass breakage, ceramic cracking, weld failures

Velocity Change (ΔV)

Energy absorption

Metal bending, plastic deformation, cushion bottoming

Pseudo-Velocity SRS

Resonant stress

PCB failures, solder joint cracks, cantilever breaks

Peak Jerk

Rate sensitivity

Adhesive failures, potting compound cracks, seal damage

Pulse Duration

Context

Distinguishes impacts from quasi-static loads

By analyzing all five parameters together, MDSP Analyzer helps you understand not just if something might fail, but how and why — enabling you to design better solutions.

What MDSP Analyzer Does

Complete Signal Analysis Pipeline

✓ Import data from any accelerometer (CSV, Excel, text files)

✓ Clean and filter with industry-standard CFC filters (SAE J211 / ISO 6487)

✓ Detect impacts automatically with adaptive burst detection

✓ Calculate statistics including RMS, peak, kurtosis, crest factor

Frequency Domain Analysis

✓ FFT and PSD with configurable windowing and averaging

✓ Waterfall FFT for time-frequency visualization

✓ 27+ industry PSD specifications built-in (MIL-STD, NASA, ISTA, IEC)

✓ Transmissibility analysis for isolation system evaluation

Shock Response Spectrum (SRS)

✓ Three SRS forms: Maximax, Primary, and Residual

✓ Pseudo-velocity SRS for stress-based assessment

✓ Configurable damping and frequency range

Modal Analysis Tools

✓ SDOF/MDOF modeling with interactive parameter adjustment

✓ System Response Simulator to predict component behavior

✓ Response Calculator for multi-DOF systems

Reporting and Export

✓ Professional PDF reports with all analysis results

✓ Excel export for further analysis

✓ Plot export as high-resolution images

✓ Session save/restore to continue work later

Who Benefits from MDSP Analyzer

Packaging Engineers

Your Challenge: Design packaging that protects products through shipping and handling without over-engineering (costly) or under-engineering (failures).

How MDSP Helps:

• Compare your drop test data to ISTA, ASTM, and custom specifications

• Analyze cushion curve data to optimize material selection

• Understand velocity change to predict cushion bottoming

• Correlate field failures to specific shock parameters

Test Engineers

Your Challenge: Validate that products meet specifications and understand why failures occur.

How MDSP Helps:

• CFC filtering compliant with SAE J211 and ISO 6487

• SRS analysis to verify shock table performance

• PSD comparison to validate random vibration tests

• Comprehensive statistics for pass/fail determination

Product Design Engineers

Your Challenge: Design products that survive real-world environments, not just lab tests.

How MDSP Helps:

• Identify which failure modes your product is susceptible to

• Understand transmissibility to design effective isolation

• Model SDOF response to predict resonance behavior

• Use PVSS thresholds to set design margins

Reliability Engineers

Your Challenge: Predict field reliability and investigate failures when they occur.

How MDSP Helps:

• Rainflow cycle counting for fatigue life estimation

• Compare field measurements to qualification test levels

• Identify environmental conditions causing failures

• Quantify cumulative damage from repeated events

Quality Engineers

Your Challenge: Ensure consistent test execution and meaningful specifications.

How MDSP Helps:

• Built-in library of industry specifications for reference

• Standardized analysis methods with documented algorithms

• Exportable reports for documentation and audits

• Repeatable analysis workflows

Industries We Serve

Industry

Typical Applications

Consumer Electronics

Drop testing, shipping simulation, display fragility

Automotive

Crash testing, road simulation, component qualification

Aerospace & Defense

MIL-STD-810 testing, pyrotechnic shock, launch vibration

Medical Devices

Transport validation, surgical instrument robustness

Industrial Equipment

Machinery vibration, installation shock, field measurements

Packaging & Logistics

ISTA testing, damage-free shipping, cushion design

Research & Academia

Teaching dynamics, student projects, research analysis

Educational Value

MDSP Analyzer isn't just a tool — it's a learning platform. The built-in Learning Center includes 11 comprehensive tutorials covering:

• DSP fundamentals: FFT, windowing, spectral leakage

• Shock analysis: SRS theory, damage potential assessment

• SDOF dynamics: Natural frequency, damping, transmissibility

• Practical examples: Real-world case studies

• Common mistakes: Pitfalls to avoid

"Engineering is fundamentally about poking systems to learn their nature. MDSP Analyzer gives you the tools to understand what happens when you poke — and what it means for your product's survival."