ASTM D7386-12 Package Testing
DES recently performed package testing per ASTM standard, ASTM D7386-12.
Category: Vibration & Shock Testing
Choosing A Vibration Test Lab Part 2
Part 2 – Selecting a Lab and Performing Your Test If you have not done so yet, please check out Part 1 – Defining your project and Obtaining a Quote. You obtained quotes from a couple of vibration test labs. Your next task is to select a vibration test lab to perform your vibration test. …
Choosing A Vibration Test Lab Part 1
Part 1 – Defining your project and Obtaining a Quote Vibration testing is a very specialized field, not very well understood by many. There are different types of vibration and there are an enormous number of vibration test specifications. Vibration testing equipment is very expensive to purchase forcing many companies to hire a vibration test …
Mixed Mode: Sine on Random Vibration Testing, RoR, SoRoR
Mixed Mode Vibration Testing is less common than Sinusoidal and Random Vibration Testing. However, it does have a special purpose for simulating specialized helicopter vibration or vibration from tracked vehicles such as tanks. The three mixed modes of vibration testing are: Sine-on-Random (SoR) Random-on-Random (RoR) Sine-on-Random-on-Random (SoRoR) Some common test standards that have specifications for Mixed …
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What is a Vibration Resonance?
A vibration resonance occurs when equipment or a product is exposed to an external forced vibration occurring at one or more of its natural frequencies. The resulting product response vibration is amplified and can be huge! Vibration resonances can cause severe damage to products and significantly shorten their life. Examples of vibration resonances can be …
Vibration Response of Products
Vibration of a mechanical system can be descried as an oscillatory motion about an equilibrium point. Certain vibrations of mechanical systems can be considered desirable, such as in musical instruments like a tuning fork or guitar. However, often times vibrations of mechanical systems are undesirable, producing wasted energy, unwanted noise and catastrophic failures. Therefore it …
Shock Testing: Long Duration Half Sine Shock
Shock testing with long durations can be a challenging endeavor. DES recently had to perform a 35G peak, half sine shock with a 50 millisecond duration. The video below shows this shock test being performed. This sounds like an easy shock to carry out because a peak of 35G is low compared to many shocks. …
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DES Performs Testing for Orion Rocket Program
Delserro Engineering Solutions (DES) was proud to be a part of the recent Orion rocket that launched on December 5th 2014. DES was contracted by a local manufacturer to help qualify their product designs for use on Lockheed Martin’s Orion rocket. DES’s role was to perform specialized shock testing on their products. Some of the …
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Temperature Cycling Testing: Coffin-Manson Equation
Temperature cycling testing is another method of accelerated life testing for products that are exposed to temperature variations during use in normal operation. The temperature variations can be a result of self heating for products that are repeatedly turned on and off, or can be the result of cyclic environmental changes — such as temperature variations from …
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Sinusoidal Vibration Basics
The brilliant scholars at CalPolyTech have diligently evaluated and assessed the Fundamentals of Vibration Measurement and Analysis in a way that even lay persons can get a grip on the fundamentality of measuring vibrations for differing purposes and projects. This reference for comprehending the physics behind the elemental vibration measurement and analysis will prove invaluable …