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Every crash test result, from restraint performance to structural response, depends on accurately capturing a pulse that lasts only milliseconds and peaks at many times the force of gravity. The accelerometers recording that event need to measure it faithfully and survive it intact, run after run.
Why Should You Use MEMS DC Accelerometers for Crash Testing?
Silicon Designs MEMS DC Accelerometers are designed for the severity of crash testing. Engineers use them on crash sleds, impact rigs, and vehicle structures for several reasons:
- They capture the whole pulse. As DC response accelerometers, they have no low-frequency roll-off. The sensor records the sustained deceleration plateau and the rebound, as well as the peak.
- They survive the hit. Modules are rated for mechanical shock up to 5,000 g, depending on range, so one sensor can serve many test runs.
- They measure orientation, too. Because they respond to static acceleration, they can track tilt and body angle during and after an event, such as in rollover testing.
- Their data is traceable. Every MEMS accelerometer is factory calibrated and serialized, which supports the documentation that test programs require.
- They fit the setup. Ranges run from ±2 g to ±400 g. Low-mass options fit in tight spaces.
In Practice: The 2210 on a Working Crash Sled
The sled pictured here is instrumented with an SDI 2210, SDI’s best-selling single-axis module, mounted on the sled frame (inset). In that position, it records the pulse used to confirm that each run matches the required test profile.
Find the Right Accelerometer for Your Crash Test Program
Planning a sled or crash test program? Every program is different. Pulse severity, mounting space, cable runs, and data acquisition setup all affect which accelerometer will serve you best. Our team will talk through your application with you, from the g-levels you expect to the documentation your program requires, and help you choose the right range and configuration. If a standard model doesn’t quite fit, our in-house engineers can work with you on a custom solution.
Frequently Asked Questions About MEMS Accelerometers for Crash Testing
Why use a DC response accelerometer instead of a piezoelectric accelerometer for crash testing?
Piezoelectric accelerometers are AC-coupled, so their output rolls off at low frequencies and they can’t hold a sustained acceleration. In a crash pulse, that can distort the deceleration plateau. DC response accelerometers measure down to 0 Hz, so they capture the full pulse, including the sustained portion, as well as the peak.
What g-range do I need for crash testing?
It depends on the severity of your pulse and where the sensor is mounted, since sled frames, dummies, and vehicle structures can see very different peak loads. A good rule is to choose a range above the highest peak you expect, with some headroom. SDI MEMS DC Accelerometers are available from ±2 g to ±400 g, and our team can help you match a range to your test profile.
How much shock can SDI’s MEMS accelerometers withstand?
SDI’s shock-resistant MEMS accelerometers are rated for mechanical shock up to 5,000 g, depending on range. That rating means one sensor can be used across many test runs rather than replaced after each impact.
Can MEMS DC Accelerometers be used for rollover testing?
Yes. Because MEMS DC Accelerometers respond to static acceleration, they can measure tilt and body angle as well as dynamic motion. That lets engineers track a vehicle’s orientation during and after a rollover event.
Are SDI accelerometers calibrated before shipping?
Yes. Every SDI module is factory calibrated and serialized, which gives test programs the traceability their documentation requires.
Can SDI build a custom accelerometer for my crash test setup?
Yes. SDI designs and manufactures its MEMS DC Accelerometers in-house in the USA. If a standard model doesn’t fit your space, range, or output requirements, our engineers can work with you on a custom solution.
