Shock and Vibration Testing

,Click to edit Master title style,Click to edit Master text styles,Second level,Third level,Fourth level,Fifth level,*,Shock and Vibration Testing,Agenda,Shock Testing,Comparison and Selection of Methods,Comparison of Specs,Rationale for Selection of Testing,Vibration Testing,Comparison and Selection of Methods,Comparison of Specs,Rationale for Selection of Testing.,Vibration and Shock,Vibration and Shock,Machine,Type,Range,Range,Capabilities,TIRA,Vibration,20,000lb vector, 2 inch displacement,5-2500Hz,3 axis slip plate; 5 ft. x 5 ft. slip table,TIRA,Vibration,12,000lb vector, 2 inch displacement,5-2500Hz,3 axis slip plate; 30 in. x 30in . slip table,Unholz Dicke,Vibration,17,000lb vector, 1.5 inch displacement,5 2500 Hz,3 axis slip plate; 36 in. x 36 in. slip table,MB Corp Model C-60,Vibration,6000lb vector, 1 inch displacement,5 3000 Hz,3 axis slip plate; 30 in. x 30in . slip table,Ling,Vibration,6000lb vector, 1 inch displacement,5 2000 Hz,3 axis slip plate; call for size limitations,Thermotron,Vibration,5 Hammer Repetitive Shock,5-20,000 Hz,HALT Thermal Shock with vibration,Elite,Package Vibration,2 4 Hz,Cam operated bounce test for transportation,AVCO FF367-1,Mechanical Shock,300gs/20ms,Inquire,Sine or saw-tooth,AVCO A105,Mechanical Shock,30,000gs/0.02ms,Inquire,Sine or saw-tooth,Schaevitz G-6-A,Acceleration,Limited by 3 ft. arm; Call for size,Vibration and Shock,Vibration and Shock,HALT Test Vibration Impactors,Heating Elements,Vibration and Shock,HALT/HASS Chamber,HALT -Highly Accelerated Life Testing,Combined six-axis vibration and temperature extremes.,Intentionally but systematically produces test item failures for the purpose of rapidly identifying mechanical, electrical, design and functional weak points.,Design weaknesses can be analyzed, corrected, and the product design optimized.,HASS -Highly Accelerated Stress Screening,Overstress test to identify marginal or defective products before shipment.,HASS test levels are identified during HALT and are established to compress test time without damaging the product or reducing its life.,Vibration and Shock,Elite HALT/HASS Chamber Capabilities,-100C to +200C (-148F to +302F),Greater than +70C per minute product temperature change rates (heating or cooling),30” x 30” Vibration Table, 480lbs total weight capacity for test item & fixture,Workspace Dimensions 42”W x 42”D x 40”H,Vibration Frequency Range: 2Hz-10kHz; Vibration Level: Up to 50Grms,Two (2) 3”x8” access ports, Three (3) 20”x20” viewing windows,Vibration and Shock,Vibration Testing,Sine, Random, SOR,Field Data Replication,Record actual vibration levels,Import data to vibration controller,Operate vibration table according to recorded profile and acceleration magnitude,Run test item for endurance,Mechanical Shock,SRS,Vibration and Shock,Drop Shock,Sawtooth, Half-Sine,Classical Shock Test Machines,Vibration and Shock,High G Mechanical Shock,Vibration and Shock,High G Constant Acceleration,Vibration and Shock,Fatigue Crack Growth,Vibration and Shock,Sine Vibration,From rotating or oscillating machinery; electric motors, wheels, engines, gears, springs.,Useful for evaluating dynamic characteristics of structures, i.e resonance,Random Vibration,More accurately represents the true environment.,Excites all frequencies,Most damage occurs at,fundamental frequency,of electronics PCB.,Vibration and Shock,Shock,High stresses causing fracture or permanent deformation,High accelerations which can cause relays to chatter, potentiometers to slip, bolts to loosen.,High displacement which can cause impact between adjacent circuit boards,Usually not considered a fatigue failure if shock quantity less than 1,000 cycles.,Selecting a Vibration Level or a Shock Pulse,Which Shock Pulse should I Apply?,How Many?,Which Level?,What is the vibration spectrum of interest?,How long should I test for?,Follow the Contract Specifications,Create Your Test Based on Existing Specifications as Guidance,Make Field Measurements,1- Follow Contract Requirements,Contract Requirements MIL-PRF-15305,Contract Requirements MIL-PRF-15305,MIL-STD-202G Method 213,2- Use Existing Specifications for Guidance,Military, Regulatory, and OEM Specs,Industry Standard Test Methods,with Recommended Levels,Create Your Own Specification,Shock Test Specs & Methods,Automotive,FORD, GM,SAE J1455,Commercial Products,IEC 68-2-27; -29; -31,Commercial Aviation,RTCA DO 160E Section 8,Military,MIL-STD-810 Systems,MIL-STD-883 Circuit Cards,MIL-STD-202 Components,Handling Drop,Classical Shock (Potholes & Crashes),Classical Shock,Bump,Free Fall,Operational and Crash Safety Shock Sustained Shock,SRS,Classical,Pyroshock,Ballistic Shock,Handling and Free Fall Drop Tests,Drop Surfaces,Concrete,Steel,Wood,Sand,Package or Device,Typical Classical Shock Tests for Electronic Systems,Typical Classical Shock Tests for Electronic Systems-,IEC 68-2-27,Elite Capability for Classical Shock,Large Avco (Assume 150lb load and fixture),Short Pulse 3msec- 300Gs,Long Pulse 30msec-20Gs,Small Avco (Assume 50lb load and fixture),Short Pulse 0.3msec- 1000Gs (longer pulses up to 10kGs),Long Pulse 6msec-500gs,Tira Electro-dynamic Vibration Table (Assume 150lb load and fixture),Short Pulse 0.5msec 150Gs,Long Pulse 30msec 15Gs,Classical Shock Pulses,Advantages,Easy to specify and understand,shape, tolerance, mathematics,Test machinery can generate pulses,Accepted methods written into many specs,Disadvantages,Not real world pulses,Does not evaluate device response to shock,Classical Shock Tests,Classical Shock Tests,Shock Response Spectrum,Shock Response Spectrum,Input Pulse,Measured Response,Shock Response Spectrum,Shock Response Spectrum,Shock Response Spectrum,Shock Response Spectrum,Preferred method for MIL-810,Describes the Peak Acceleration Response vs. Freq,Develop a simple shock pulse that will generate the response function,Some ED shakers have SRS capabilities,Ringing plates,Pyrotechnic Shock,Pyrotechnic Shock,Pyrotechnic Shock,Pyrotechnic Shock,Ballistic Shock,Custom Shock Evaluation,ASTM D3332,Damage Boundary,Response to short duration pulse is a function of velocity change.,Response to long duration pulse is a function of the peak acceleration and waveform.,MIL-810 Fragility Test,Vibration and Shock Summary,Follow the Contract Specifications,Create Your Test Based on Existing Specifications as Guidance,Make Field Measurements,Call us with your application needs.,Thank you for this opportunity to serve you.,