This article is a general outline on how to implement a HASS program after a successful HALT has been performed and corrective actions have been completed for any weaknesses found during HALT. For more information about HASS, please read our blog, What is HASS Testing? For more information about HALT, please read our blogs
Delserro Engineering Solutions (DES) was proud to recently perform testing for the NASA Psyche Program. More information about this program can be found at the following web link https://www.jpl.nasa.gov/missions/psyche/.
DES was contracted by a local manufacturer to help qualify their product for use in the demanding Psyche spacecraft environment. DES’s role was to perform specialized pyroshock testing and vibration testing on their products.
What sets DES apart from other labs is our in-depth experience and technical capability to understand and reproduce the most complicated vibration and shock profiles. DES continues to perform the most complex vibration and shock tests on products that are used in outer space, rockets, missiles, automotive & truck environments, military environments, etc.
For more information on Pyroshock Testing, Shock Testing, Vibration Testing or other testing services, contact DES or call 610.253.6637.
This is another part of a series of blog posts concerning the MIL-STD 810 Shock Section, Method 516. This blog was written with reference to MIL-STD-810G w/Change 1 dated 15 April 2014. DES has the experience and expertise to run your MIL-STD-810 test. For more information, please check out our DES shock testing services page and our other MIL-STD-810 shock testing blog articles:
MIL-STD 810, Method 516, Shock Testing Overview
MIL-STD 810, Method 516, Shock Testing Procedure I – Functional Shock
MIL-STD 810, Method 516, Shock Testing Procedure II – Transportation Shock
MIL-STD 810, Method 516, Shock Testing Procedure III – Fragility
Method 516, Procedure IV is for testing products that could be accidently dropped such as when they are removed from a shelve or dropped when handling. The test item is physically dropped onto a hard surface to produce the shock. Products can be tested inside their transit case or unpackaged. Typically, they would be tested in the configuration that is normally used for transportation, handling, or a combat situation.
Continue Reading MIL-STD 810, Method 516, Shock Testing Procedure IV – Transit Drop
This is another part of a series of blog posts concerning the MIL-STD 810 Shock Section, Method 516. This blog was written with reference to MIL-STD-810G w/Change 1 dated 15 April 2014. DES has the experience and expertise to run your MIL-STD-810 test. For more information, please check out our DES shock testing services page and our other MIL-STD-810 shock testing blog articles:
Procedure III is used to determine what shock conditions will cause a product to stop operating, degrade or fail. The shock magnitudes are systematically increased until a problem occurs. This procedure can be also performed using environmental temperature conditioning.
This article will assume that the fragility shocks expected to be encountered by the product are not complex transients. Therefore, the trapezoidal classical shock pulse, as defined in Figure 516.7-11 and Table 516.7-V from MIL-STD-810, Method 516 would be used for Fragility testing.
Continue Reading MIL-STD 810, Method 516, Shock Testing Procedure III – Fragility
This is part two of a series of blog posts concerning the MIL-STD 810 Shock Section, Method 516. This blog was written with reference to MIL-STD-810G w/Change 1 dated 15 April 2014. DES has the experience and expertise to run your MIL-STD-810 test. For more information, please check out our DES shock testing services page and our other MIL-STD-810 shock testing blog articles:
MIL-STD 810, Method 516, Shock Testing Overview
Shock testing according to Procedure I of MIL-STD 810, Method 516 is intended to test products while they are operating to see if any functional problems occur and to determine if they survive without damage. The applied shocks usually represent those that may be encountered during operational service. This article will focus on the shock test condition when measured field data is not available and the testing will use classical shock impulses. The terminal peak sawtooth is the default classical shock pulse to be used for this condition. Figure 516.7-10 from MIL-STD-810 shows its shape and tolerance limits. Table 516.7-IV contains the terminal peak sawtooth default test parameters for Procedure I -Functional Test. In limited cases a half sine shock impulse is specified. Its shape and tolerance limits are shown in Figure 516.7-12.
Continue Reading MIL-STD 810, Method 516, Shock Testing Procedure I – Functional Shock
DES successfully completed a challenging random vibration test. The high level random vibrations were 46.3 Grms from 50-2000 Hz.
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:
Continue Reading MIL-STD-810: Vibration Testing Category 8 – Aircraft – Propeller
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:
Continue Reading MIL-STD-810: Vibration Testing Category 7 – Aircraft – Jet
This is part 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 the other blog posts in this series,
MIL-STD-810 Vibration Testing Overview
MIL-STD-810: Vibration Testing Category 4 – Truck/Trailer – Secured Cargo
Procedure I (General Vibration), Category 9 of Method 514.7 Vibration testing details the vibration profile of cargo carried in helicopters. This vibration profile is unique because it superimposes strong narrowband peaks of sinusoidal vibration caused by rotating components such as the main or tail rotors, over low-level wideband random vibration caused by aerodynamic flow. This vibration profile is generally referred to as Sine on Random Vibration Testing. Figure 1 outlines the typical vibration profile and the variables which are determined based upon the type of helicopter as well as the location on the helicopter where your product will be used or stored. Tables 1 and 2 define the equations and properties used to determine the variables used in the Figure 1 plot.
Continue Reading MIL-STD-810: Vibration Testing Category 9 – Aircraft – Helicopter
This is part two 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 Part 1 – MIL-STD-810 Vibration Testing Overview blog and our Vibration Testing services page.
Category 4 of Method 514.7 Vibration testing details the transportation random vibration environmental conditions from cargo interaction with vehicle suspension and structures with road and surface discontinuities. “This environment may be divided into two phases, truck transportation over US highways, and mission/field transportation. Mission/field transportation is further broken down into two-wheeled trailer and wheeled vehicles categories.”
This vibration test method is used when products or equipment will be transported by large trucks tractor-trailers commonly seen on US highways. The truck transportation over US highways random vibration profile is designed to simulate 1609 km (1000 miles) on interstate highways. The random vibration profile along each axis can be seen in the plot below in Figure 1. The length of this profile is 60 minutes per axis for each 1000 miles of transportation. For example to simulate 2000 highway miles, the vibration test duration would be 2 hours per axis x 3 axes = 6 hours total.
Figure 1. Figure 514.7C-2 from MIL-STD-810G w/ Change 1
Continue Reading MIL-STD-810: Vibration Testing Category 4 – Truck/Trailer – Secured Cargo
