Why choose Dytran accelerometers for aviation crash testing

This article analyzes why this sensor family has become the preferred choice for high-frequency impact, shock, and vibration testing in the aerospace and defense industries.

1. The Harsh Characteristics of Aerospace Impact Testing

Aviation crash testing—from ejection seat and parachute deployment tests to aircraft frame crash simulations—has entirely different measurement requirements compared to typical automotive crash tests:

• - Extremely high acceleration in extremely short time: Impact pulses can reach thousands of grams in just a few milliseconds, requiring sensors to respond instantaneously without saturation or signal delay.
• - Very wide frequency range: Shock pulses contain high-frequency components up to tens of kHz, requiring sensors with sufficiently high resonant frequencies to avoid distorting the measurement signal.
• - Harsh environment: Large temperature fluctuations, humidity, high ground vibrations, and sometimes strong electromagnetic pulses from the detonator or pyrotechnic system during testing.

2. Why Does Dytran Meet These Requirements?

Designed for ultra-high acceleration measurement ranges.

Dytran accelerometers, specifically designed for shock testing, typically have a measurement range of up to tens of thousands of grams – far exceeding the range of conventional NVH accelerometers (only a few hundred grams). This allows the sensor to accurately record impact impulses without signal clipping, a crucial factor in aviation safety analysis.

High natural resonant frequency

Dytran sensors for shock/crash applications are designed with a very high resonant frequency, which minimizes "ringing" (post-pulse oscillation) – a common error that distorts measurement data and makes accurate analysis difficult.

Mechanical strength and overload capacity

In real-world impact testing, sensors may be subjected to surges far exceeding their nominal range if unexpected events occur. Dytran sensors are renowned for their high overload survivability, protecting data and equipment in unforeseen test scenarios.

Durable structure in harsh environments

Dytran's materials and mechanical design are optimized for stable operation under extreme temperature conditions and environments with strong electromagnetic pulses – common in tests involving pyrotechnic systems or detonation devices used in aerospace and defense testing.

3. Specific Applications in the Aviation Industry

4. Dytran's prominent accelerometer sensor lines

4.1. IEPE Accelerometers – IEPE Accelerometer Sensors

This is Dytran's most popular sensor line, featuring an integrated signal amplification circuit (IEPE), allowing direct connection to DAQ systems without the need for an external amplifier.

Key features:

• Wide frequency range.
• High sensitivity.
• Good noise immunity.
• Simple to install and use.
• Compatible with modern data collection systems.

4.2. MEMS Accelerometers – MEMS Accelerometer Sensors

Using MEMS (Micro Electro Mechanical Systems) technology, this sensor series is suitable for measuring low-frequency vibrations or static acceleration.

Key features:

• Both static and dynamic acceleration can be measured.
• Compact size.
• High stability.
• Good impact resistance.
• Low power consumption.

4.3. Triaxial Accelerometers – Three-axis accelerometer sensors

This allows simultaneous measurement of acceleration in three directions (X, Y, and Z) with just one sensor.

Key features:

• Collect data simultaneously along three axes.
• Reduce installation time.
• High accuracy.
• Saves space.

4.4. High Shock Accelerometers – Shock sensors

Designed to measure very large acceleration pulses over short periods of time.

Key features:

• The measuring range extends up to tens of thousands of grams.
• High frequency response.
• Withstands strong impacts.
• The design is robust.

4.5. Miniature Accelerometers – Ultra-small accelerometer sensors

Their very small size and weight limit the sensor's impact on the object being measured.

Key features:

• - Extremely lightweight.
• - High sensitivity.
• - Wide frequency response.
• - Easy to install in tight spaces.

4.6. Charge Mode Accelerometers – Charge Output Sensors

This sensor series is specifically designed for high-temperature environments or harsh working conditions.

Key features:

• - Operates at high temperatures.
• - Wide frequency range.
• - Good stability.
• Suitable for in-depth measurements.

4.7. Automotive Test Accelerometers – Sensors for automotive testing

Dytran also develops a range of specialized sensors for the automotive industry, meeting international testing standards.

Key features:

• - High accuracy.
• - High resistance to vibration and shock.
• - Compact design.
• - Compatible with many DAQ systems.

5. Notes on Implementing Impact Measurement with Dedicated Accelerometers

Selecting the correct Dytran sensor for each specific test—from the measurement range and resonant frequency to the mounting method (rigid mounting or mounting via insulated adapter)—requires in-depth expertise in both the equipment and the relevant aerospace and defense testing standards. Incorrect installation or selection of an unsuitable measurement range can render all test data invalid, even if the impact pulse occurs only once and cannot be repeated.

Given the demanding technical requirements of aviation impact testing, businesses need a partner who understands both the equipment and the real-world testing challenges. GPower Vietnam offers comprehensive partnership value:

• - Sensor selection advice: Determine the correct Dytran accelerometer model suitable for each type of impact pulse and specific test conditions.
• - Supplier consultation: Direct connection with authorized suppliers, ensuring quality and clear origin for measuring equipment in the aerospace and defense industries.
• - Integrated solution consulting: Ensuring the sensor operates synchronously with the high-speed DAQ system, meeting the requirements for high-frequency pulse detection.
• - Calibration, warranty, and maintenance: Regular calibration services help sensors maintain accuracy through multiple testing cycles.

Contact GPower Vietnam today for advice on specialized impact sensor solutions for your aerospace and defense projects - Hotline: 0936093289 | Email: info@gpower.com.vn