The loose cargo environment includes conditions experienced by cargo transported in a vehicle traversing irregular surfaces. I. This test method establishes procedures for determining the effect of sinusoidal vibration, within the specified frequency range, on switch contacts, mounting hardware, adhered component parts, solder or heat stakes, tactile devices, and cable or ribbon interconnects associated with a membrane switch or membrane switch assembly. //. When this occurs, allowances should be provided in the test setup, and in the vibration excitation system, to account for this. The procedure is similar to the previous version of the standard including MIL-STD 810G vibration. The test item is loaded on the vehicle and secured or mounted to represent the life cycle event. The basic information required to conduct a vibration test is listed below: Know what structural mode shapes will be present in testing your new itemKnow what frequency range  you anticipate  measuringKnow what “G” level amplitude you anticipate measuringKnow what environmental conditions the test will be conducted withinSelect the correct sensor technologies to use in your test programDetermine the most useful style of sensor mounting and cable routing to useKnow what methods of data acquisition and data reduction will be usedPrepare your individual measurement system components to be clean, neat, orderly and ready for installation. } Package testing or packaging testing involves the measurement of a characteristic or property involved with packaging.This includes packaging materials, packaging components, primary packages, shipping containers, and unit loads, as well as the associated processes. It is good practice to completely understand the reason for conducting the test. "Mobile Site" APPENDIX F. VIBRATION TESTING PROCEDURE Appendix F. SPS-F-1 of 14 VIBRATION PERFORMANCE TESTING. Dynamic deflections may cause impact to elements and/or disruption of function. Computer simulation is very helpful in determining structure modes and mode shape. 9.0 Explosion proofness: These tests subject the test article to an environment under vacuum, with a gaseous mixture of combustibles. Therefore, various parameters of the test, the test environment, the instrumentation setup, instrumentation calibration, data collection, data reduction and data analysis are extremely critical to conducting a viable test program. With the motor at normal operating temperature, the vibration velocity shall not exceed 2.8 mm/s RMS, or 4 mm/s PEAK, in any direction. Vibration is most commonly measured using a ceramic piezoelectric sensor or accelerometer. This is often also known as Modal Testing. Weebly.footer.setupContainer('cdn2.editmysite.com', '1607474892'); The typical aircraft random vibration test profiles are between 30 minutes and 6 hours per axis, with 3 hours being a common choice in the absence of specific knowledge of the transportation profile. Often truck random vibration profiles are testing in conjunction with aircraft profiles to represent transport before and after air transport. The most realistic alternative for truck, trailer, or other ground transportation requires the transportation vehicle and a full cargo load. ¾What you can hear is only part of the story. It is also applied to the free flight phases of ground or sea-launched missiles. } else { Loose Cargo. Accelerometers are full-contact transducers typically mounted directly on high-frequency elements, such as rolling-element bearings, gearboxes, or spinning blades. font-family: SQMarket-Medium; For best results, ensure the package tester is large enough to accommodate the dimensions and weight of specific test items. The previous procedures are used for other portions of the store’s life cycle as needed. The random vibration test profiles are executed in all three axes for a duration ranging from 9 minutes to 38 hours. Rotary Vibration Test Procedures We perform the rotary vibration test on a mechanical rotary vibration machine. } ); This procedure applies to ground vehicles as well as fixed and rotary wing aircraft. Simulation of the environment used for Procedure II, requires use of a package tester. When vibration increases beyond normal levels, it may be a sign of alignment issues or source of trouble and you need fast and actionable answers. Generally, measured vibration data is not used to define this test, but it is often acquired during this test. The test facility for Procedure III requires test surfaces and vehicles that represent transportation. Vibration Testing Rocket boosters and spacecraft are subject to intense acoustic environments during launch, which induce high levels of vibration in structural elements and equipment. Potentially, such testing can include all environmental factors related to wheeled vehicle transport, including: vibe testing, shock, temperature, humidity, pressure, etc. These material assemblies are either installed in, or transported by wheeled or tracked vehicles. From instrument panels to seats inside the car and from air-bag sensors to fuel injection pumps in the engine compartment, many automotive components are being tested to precise vibration patterns and levels. "    " + A structural vibration test on a new design is the premise of the test we are discussing. The test object is exposed to a certain vibration level according to a procedure specified by national and Internatrionai standards, To find the dynamic properties of a structure, the re- sponse to a vibrational force Is of interest rather than the actual vibration level. Carrying vehicles include trucks, trailers, or tracked vehicles and is not secured to the carrying vehicle. Procedure III is an alternative for ground transportation. This procedure is used to test material that is not secured to the carrying vehicle. This is the best vibration testing option. Part 2, PROCEDURES, covers measurement procedures of sound and vibration testing for building systems. Recommended troubleshooting procedure. Testing the product to failure will teach the company many important things about its product’s weaknesses and ways to improve it. Prepare your individual measurement system components to be clean, neat, orderly and ready for installation. In this test, the cargo is free to bounce, scuff and collide with other cargo, and the sides of the vehicle. windowHref += '? If the above items are satisfactory, but vibration remains high, perform a thorough vibration analysis. The general vibration includes random vibration. windowHref += '&'; There has always been some confusion concerning the various tests offered to the vibration testing engineer by the vibration test labs. Mil-810 vibration is the standard for conducting vibration laboratory tests. General Perform a vibration analysis on all motor driven equipment listed below after it is installed and ready to run. } This enables driving the test item directly, or through a fixture. When acquired it is used to verify that vibration and shock criteria for material subassemblies are realistic. Vibration is then applied to the test item as an input at the fixture/test item interface. Procedure IV of mil-std 810 vibration uses standard vibration laboratory exciters, or shakers. This procedure is applicable to large assemblies or groupings that form a high proportion of vehicle mass. Testing measures the effects and interactions of the levels of packaging, the package contents, external forces, and end-use. An accelerometer is a sensor that measures the dynamic acceleration of a physical device as a voltage. The test conductor should make all attempts to discuss this information with the design team. var windowHref = window.location.href || ''; This procedure assumes no relative motion between the vehicle cargo deck, or cargo compartment and the cargo. Random testing is the key testing method for this kind of application. Beginning Vibration Analysis Connection Technology Center, Inc. 7939 Rae Boulevard Victor, New York 14564 www.ctconline.com It is good practice to completely understand the reason for conducting the test. Random vibration is also more realistic than sinusoidal vibration testing, because random simultaneously includes all the forcing if (document.readystate === 'complete') { The machine will vibrate at 1.0" total displacement. Powered by This procedure is directly from MIL-STD 810H, but is accurate for previous versions including MIL-810G vibration. Our capabilities include testing to commercial and military vibration testing standards. VIBRATION ANALYSIS PROCEDURE A vibratory system is a dynamic one for which the variables such as the excitations (inputs) and responses (outputs) are time dependent. Where do the actual vibration test profiles originate? This includes synergistic effects of other environmental factors, material duty cycle, and maintenance. Difficulties encountered usually concentrate on the differences between sinusoidal vibration (sine testing) and random vibration testing. Create your own unique website with customizable templates. Frequency range, and low frequency stroke length (displacement) required are also important. This procedure applies to not just 810H random vibration. Stacking or bundling of sets or groups of material items may affect the vibration transmitted to individual items. It is also applicable to material that forms an integral part of the vehicle. Procedure I is not applied to fixed wing aircraft carriage or free flight phases. Ensure the test item configuration includes appropriate numbers and groupings of items. This procedure assumes no relative motion between the vehicle cargo deck, or cargo compartment and the... Stacked Cargo. Steady state or transient vibration may also be applied as appropriate. This procedure replicates the vibration and shock environment of large assemblies of material. For this procedure, the test item is secured to a vibration exciter. Packages will be subjected to a total of 14,200 vibratory impacts. 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