Delserro Engineering Solutions - Page 6 of 10 - Product Reliability & Vibration Testing Since 1982

DES is Looking for a Quality or Test Engineer

For over 30 years, Delserro Engineering Solutions (DES) has been an industry-wide leader in the field of product reliability testing. DES is currently seeking an experienced quality engineer or a test engineer.

Responsibilities of this position include:

Setting up and performing tests
Writing procedures and test reports
Have a thorough understanding of test equipment such volt meters, power supplies, data acquisition systems, test chambers & vibration/shock equipment
Working within the requirements of ISO/IEC 17025 and DES’s operating policies
Understanding and following detailed instructions, test standards and specifications

Additional requirements of this position include:

Must be a US citizen
Proficient with Microsoft Office products
Able to effectively communicate
Able to meet deadlines and multitask
Able to lift 50 pounds without stress
Must be a team player and work well with group activities

Experience with the following is a plus:

ISO 17025 Quality Management System
Previous work experience in a test lab environment
Operation of instrumentation, temperature chambers, & vibration/shock test equipment
Test methods such as HALT, temperature & humidity testing, vibration & shock testing, reliability and durability testing
Test standards such as MIL-STD-810, RTCA DO-160 & ISO 60068
Package Testing
Reliability and Accelerated Life Testing theories

Please e-mail resumes and salary requirements to info@desolutions.com

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

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.”

Truck Transportation over US Highways Vibration Testing

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.

Vibration Testing MIL-STD-810G w/ Change 1 — **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 →

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MIL-STD-810 Vibration Testing Overview

This is part one of a series of blog posts discussing MIL-STD 810 Vibration Testing. 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. Check out our vibration testing capabilities here.

MIL-STD-810 is a public military test standard that is designed to assist in the environmental engineering considerations for product design and testing. For the purposes of this blog series we will focus on Method 514.7, titled Vibration. This section defines the environmental vibration conditions a material or product may experience during the product life cycle and translates these conditions into replicable test procedures. Unfortunately, unless you’re familiar with this document, this section or any section for that matter may seem a little daunting. This blog will hopefully provide some guidance into navigating your way through it.

vibration testing standard MIL-STD-810 — **Figure 1. Table 514.7-I from MIL-STD-810G w/ Change 1**

Continue reading MIL-STD-810 Vibration Testing Overview →

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Door Open/Close Accelerated Life Test Case Study

Customer Goal

A customer contacted DES, seeking to create a reliability test plan for their product based on customer usage, new features and design limits. One of the concerns identified by the customer was the need for an accelerated life test which tested whether their “door assembly” product met the design specification for usage. In other words, the goal was to create an automated test solution which opened and closed cabinet doors to the estimated amount they would see during a lifetime in the field.

Continue reading Door Open/Close Accelerated Life Test Case Study →

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Circuit Board HALT Testing Case Study

Customer Goal

A customer approached DES looking to perform Highly Accelerated Life Testing (HALT) on a new circuit board design. DES and the customer agreed to test the circuit boards using DES’s traditional HALT test procedure which calls for hot/cold temperature steps followed by rapid temperature ramping, vibration steps and combined temperature and vibration stresses. HALT testing on electrical componentry is quite common across industry to expose design weaknesses; both mechanical and electrical (What is HALT and Why Perform HALT?). Typical failures include poor solder connections, overheating, component failure, etc. (What Kind Of Failures Occur During HALT?)

Continue reading Circuit Board HALT Testing Case Study →

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Rapid HALT – A Cost Effective Alternative to HALT

Rapid Highly Accelerated Life Testing or Rapid HALT is a reliability test method that is used to expose product weaknesses. A Rapid HALT procedure is a modification of a Classical HALT procedure. For more information about Classical HALT procedures, refer to the following blog articles:

A Rapid HALT is an abbreviated HALT, typically one day of tests, making it a great cost-effective solution for those seeking faster qualitative results. Exposing a product to a Rapid HALT early in the design process can help reduce product development time and cost by enabling manufacturers to identify flaws or areas of improvement before it’s too late.

Rapid HALT’s are a good tool for assessing the reliability of different suppliers of components but can also be used to assess the reliability of less complicated products. For example, DES has performed Rapid HALT’s to evaluate the reliability of different suppliers of power supplies, cooling fans, and LED’s. DES has also performed a Rapid HALT to study different fastening methods in order to determine which was more robust.

Figure 1. DES Rapid HALT Profile

Continue reading Rapid HALT – A Cost Effective Alternative to HALT →

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Qualification Testing on Aerospace Connectors

DES recently performed qualification testing on aerospace connectors which involved combined temperature and sinusoidal vibration testing, random vibration testing and shock testing. Combined temperature and sinusoidal vibration tests were performed per EIA 364-28F. EIA 364-28F required test conditions of 10-2000 Hz, 20G maximum acceleration sweeps at temperatures of -54°C and 200°C over the course of 4 hours per axis. Random vibration tests were also performed per EIA 364-28F. Random vibrations at 50-2000 Hz, 46.3 Grms were applied to the connectors for 8 hours per axis. The random vibrations were applied at room temperature. Finally, the connectors were subjected half sine shocks per EIA 364-27C. The shock requirements were three shocks per polarity, per axis at 300G over the duration of 3msec. A sample shock plot can be seen in Figure 1.

Sample Shock Testing Chart — **Figure 1 – Sample Shock Test Plot**

Continue reading Qualification Testing on Aerospace Connectors →

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Package Testing Using Combined Temperature & Vibration

Nowadays global markets and expedited shipping methods expose packages to less than ideal conditions during the transport process. International Safe Transit Association (ISTA), International Air Transport Association (IATA), International Organization for Standardization (ISO) and American Society for Testing and Materials (ASTM) all contain protocols and requirements used to evaluate product package design. Some of these test profiles require combined environments such as combined temperature and vibration testing. This type of testing requires specialized equipment, set up and experience from the lab conducting the test.

Continue reading Package Testing Using Combined Temperature & Vibration →

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Fastener Vibration Testing

DES recently performed fastener vibration testing per MIL standard, MIL-F-25173A. MIL-F-25173A is a military specification aimed at determining qualification criteria for aircraft fasteners and equipment. In this case, DES focused on the vibration testing of a particular fastener to be used in aircraft applications. Tests were conducted on DES’s Unholtz-Dickie Electrodynamic Shaker. The MIL-F-25173A standard requires specimens to be subject to sinusoidal vibration testing, cycled between 10 and 55 Hz uniformly and with a constant 0.06 inDA displacement. Tests shall span the course of 90 minutes over three perpendicular axes.

Continue reading Fastener Vibration Testing →

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Cooling Fan Reliability Testing Case Study

Customer Challenge

A customer approached DES looking to find an accelerated test solution for an AC powered cooling fan used in one of their products. The product had been established in the marketplace and the company was now looking for ways to reduce cost by looking at different cooling fan suppliers. Most fans, however, have a mean life rated for over 20,000 hours, so a typical accelerated life test would require a significant amount of time and money.

Continue reading Cooling Fan Reliability Testing Case Study →

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