Test fixture resonance. Prior to test, a test fixture survey should be conducted to ensure that the structural characteristics of the test fixture do not introduce uncontrollable resonances into the test setup. The survey may be experimental or analytical. If problematic resonances are identified, modifications should be made to the test fixture to shift the resonance beyond the frequency range of the test or to dampen the resonance in order to minimize the effect on the test.
Condition monitoring starts with basic inspections. Small changes, like abnormal heat or pressure, strange sounds, excessive vibration, or a different smell, are often signs that something is going haywire. There are several machine condition monitoring techniques that are used for the assessment of machine conditions.
Vibration Testing is one such environmental test critical to the design process. All closed-loop vibration tests, consists of four main components: a vibration controller, an amplifier, a shaker, and a feedback sensor, together, these four components make up a vibration testing system. ETS Solutions Asia instruments vibration controllers control electrodynamic and hydraulic shakers from tabletop to warehouse size systems.
Condition monitoring is the activity of periodically checking equipment, with the aim that the equipment is in a healthy condition so that the equipment can work according to its function. Adopting proactive predictive maintenance techniques is much more than just good plant management, it is good business. Anticipating machine failures before they occur, allows you to catalyze improvements that create positive ripple effects for the entire enterprise.
Ideally, the vibration test fixture should be designed to be: first, as light as possible and second, as stiff as possible. But in the real vibration testing world, there are a lot of constraint that we need to consider and then we need to find and optimum point, that can balance all required aspects such as cost, timeline, etc.
Sine Vibration Testing may be considered as the most basic vibration testing method used. This type of vibration testing requires less complex parameters compare to other type of vibration testing. Knowing the nature of sinusoidal signal, makes this type of vibration testing easier to understand and to get familiar with. Though, easier to understand does not make it less important compare to other type of vibration testing. Sine vibration testing may still be at the top rank when we are thinking of dynamic characteristic measurement.
ETS I Series Vibration Testing System with force rating from 4,000 to 16,000 kgf is ideal for screening of medium sized assemblies with extreme high acceleration test level and high frequency range. The Extreme Acceleration Shaker Y-Ring (EAS-Y Ring) armature is a revolutionary design which will allow for using a proportioned head expander to test multiple specimens simultaneously at extreme high acceleration level.
National Aeronautics and Space Administration (NASA) is one of the most well-known aerospace agencies in the world. Therefore, NASA standards are also used as reference for testing laboratory to run testing related to component or sub-system of a spacecraft. NASA-STD-7002B is part of NASA standard that provides a standard set of flight hardware test requirements.
While accelerometer is playing the role of feedback sensor at vibration testing system, then vibration controller can be considered as the "brain" of it. Vibration controller is the device that sending the "instruction" in the form of drive voltage during vibration testing, and also interpreting the feedback signal coming from the accelerometer.
When we have large size of rotating machinery, performing corrective or preventive maintenance may not be so easy anymore. Based on the periodicity of the data collection, machine health condition monitoring can be classified into below categories: 1. Periodical Monitoring; 2. Semi-Online Monitoring; 3. Real Time Monitoring
When we have a relatively small size and simple shape of UUT, with a simple mounting pattern, simple product orientation and low frequency test range, it will not be so tough to design a good vibration test fixture. But when we start to see one or more of below characteristics, then likely we will find designing vibration test fixture to be very challenging.
What is a Vibration Test Fixture? Looking at its appearance, vibration test fixture is needed for mounting our Unit Under Test (UUT) to the Vibration Testing machine. Is that it? Unfortunately, not that so straight forward. For some engineer, vibration test fixture may be considered just like an adapter. As long as the UUT can be mounted to vibration machine platform, then it is good enough. But for test engineer with experience, designing a vibration test fixture may be quite challenging as well.
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