MIL-STD-810: Vibration Testing Category 8 – Aircraft – Propeller

DES — Wed, 09 Nov 2016 14:10:07 +0000

This is part four of a series of blog posts concerning the MIL-STD 810 Vibration Section. This blog was written with reference to MIL-STD-810G w/Change 1 dated 15 April 2014. DES has the experience and expertise to help you determine what profiles are appropriate for your product and to run your MIL-STD-810 vibration test. For more information, please check out our Vibration Testing services page and our other MIL-STD-810 vibration testing blog articles:

MIL-STD-810 Vibration Testing Overview

MIL-STD-810: Vibration Testing Category 4 – Truck/Trailer – Secured Cargo

MIL-STD-810: Vibration Testing Category 9 – Aircraft – Helicopter

MIL-STD-810: Vibration Testing Category 7 – Aircraft – Jet

Category 8 of Method 514.7 simulates the vibration environment for cargo carried in propeller aircraft. The vibration environment generated from propeller aircraft are dominated by high amplitude approximately sinusoidal spikes at propeller passage frequency and harmonics. Lower level wide band random vibration is also present due to air flow over the aircraft. Collectively, these phenomena are superimposed to create the vibration profile for cargo carried on propeller aircraft resulting in a Mixed Mode Vibration Test.

Figure 1 and Table 1 show the vibration profile for this environmental condition. The test durations are obtained from the products life cycle environment or one hour per axis if the duration is unknown.

Figure 1. Figure 514.7C-8 from MIL-STD-810G w/ Change 1 – Propeller Aircraft Vibration Exposure

Table 2. Table 514.7C-VIII from MIL-STD-810G w/ Change 1 – Vibration Exposure based on Location.

To learn more about our vibration testing services, please feel free to contact us with your inquiry. Feel free to explore our site to learn about our full line of product testing services, and the test standards that we can help our clients with.

The post MIL-STD-810: Vibration Testing Category 8 – Aircraft – Propeller appeared first on Delserro Engineering Solutions.

MIL-STD-810: Vibration Testing Category 7 – Aircraft – Jet

DES — Wed, 05 Oct 2016 15:49:11 +0000

This is part three of a series of blog posts concerning the MIL-STD 810 Vibration Section. This blog was written with reference to MIL-STD-810G w/Change 1 dated 15 April 2014. DES has the experience and expertise to help you determine what profiles are appropriate for your product and to run your MIL-STD-810 vibration test. For more information, please check out our Vibration Testing services page and our other MIL-STD-810 vibration testing blog articles:

MIL-STD-810 Vibration Testing Overview

MIL-STD-810: Vibration Testing Category 4 – Truck/Trailer – Secured Cargo

MIL-STD-810: Vibration Testing Category 9 – Aircraft – Helicopter

Category 7 of Method 514.7 Vibration testing simulates vibration conditions of cargo in jet aircraft. These vibrations are broadband random. Typically the maximum vibration levels produced are caused by the exhaust noise generated during takeoff. Vibration during normal flight is substantially less. Figure 1 and Table 1 detail the Acceleration Spectral Density (ASD) and frequency levels of various aircrafts and the vibration exposure of cargo carried on those respective aircrafts during takeoff. The General Exposure curve can be used when the specific aircraft is no known.

The test duration is 1 minute per takeoff times the number of takeoffs the product may see in its lifetime.

Figure 1. Figure 514.7C-6 from MIL-STD-810G w/ Change 1 – Jet Aircraft Cargo Vibration Exposure

Table 1. Table 514.7C-VI from MIL-STD-810G w/ Change 1 – Break points for Figure 1

The post MIL-STD-810: Vibration Testing Category 7 – Aircraft – Jet appeared first on Delserro Engineering Solutions.

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MIL-STD-810: Vibration Testing Category 8 – Aircraft – Propeller

MIL-STD-810: Vibration Testing Category 7 – Aircraft – Jet