1 GHI’s ESSM Environment Shock Simulation Machine A Powerful Concept - Produces Equivalent Hard...

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GHI’s ESSM GHI’s ESSM Environment Shock Environment Shock Simulation MachineSimulation Machine

A Powerful Concept A Powerful Concept

- Produces Equivalent Hard Surface Shocks - - Produces Equivalent Hard Surface Shocks -

For For

Evaluation of Miniaturized or Hand-Held DevicesEvaluation of Miniaturized or Hand-Held Devices

Copyright © 2005 GHI Systems, Inc.All Rights Reserved

22 © 2005 GHI Systems, Inc.© 2005 GHI Systems, Inc.

Hard Surface Environmental Hard Surface Environmental Shock PhysicsShock Physics

Drops on hard surfaces produce the most severe Drops on hard surfaces produce the most severe environmental shocks.environmental shocks.

Have very high acceleration and frequency.Have very high acceleration and frequency. Results in very short stopping distances having high strain Results in very short stopping distances having high strain

rate. rate. Cause product case and internal damageCause product case and internal damage

These dynamics can’t be accurately simulated by These dynamics can’t be accurately simulated by programmed shock or drop test machines.programmed shock or drop test machines.

ESSM controls the variables of impact orientation, impact ESSM controls the variables of impact orientation, impact surface and dynamics.surface and dynamics.


Parameters Needed for SimulationParameters Needed for Simulation

Unrestrained non-tumbling free fall from threat Unrestrained non-tumbling free fall from threat height height

Impact surface to simulate environment Impact surface to simulate environment

Controlled impact and sensor orientation Controlled impact and sensor orientation

Drop velocity verification Drop velocity verification

Captured shock waveform for analysisCaptured shock waveform for analysis Shock Response SpectrumShock Response Spectrum


ESSM Vs Drop Shock MachineESSM Vs Drop Shock Machine

Simulates Environment ShockSimulates Environment ShockExact drop heightExact drop heightGauges impact velocityGauges impact velocitySimulates the impact surfaceSimulates the impact surfaceWorst Case stopping distance Worst Case stopping distance Repeatable dynamics Repeatable dynamics Easy for HS video to “see” the Easy for HS video to “see” the impact dynamicsimpact dynamicsSmall Lab space footprintSmall Lab space footprintEasily relocatedEasily relocatedLower overall costLower overall cost

Impact limited by MEPImpact limited by MEPOnly equivalent drop height Only equivalent drop height Impact velocity not controlledImpact velocity not controlledNo impact surface - is fixtured No impact surface - is fixtured Stopping distance is limited Stopping distance is limited Dynamics limited by fixtureDynamics limited by fixtureDifficult for HS video Difficult for HS video Shows little of real Shows little of real environment shockenvironment shockLarge relative footprintLarge relative footprintHard to relocateHard to relocateHigher overall costHigher overall cost

ESSM DROP SHOCK


Basic ESSM ElementsBasic ESSM Elements

Guide Rods

UUT Grasper

UUT Grasper

Pre-Impact Triggered Retracting Holders

72” Drop Height Scale &Velocimeter Sensor

UUT GuideStop Cushions& Release Triggers

SurfaceSimulatorAnvil

ESSM Seismic Mass

DetachableImpact Anvil

Shock Sensor On UUT

Drop height Setting andUUT release


Basic ESSMBasic ESSMBase . . . . . . . . . . . 18”x16” Base . . . . . . . . . . . 18”x16” Seismic mass . . . . .120 lbs plus anvil Seismic mass . . . . .120 lbs plus anvil Shafts . . . . . . . . . . .SS 1.00” on 8” centersShafts . . . . . . . . . . .SS 1.00” on 8” centersBearings . . . . . . . . .Recirculating BallBearings . . . . . . . . .Recirculating BallImpact Anvil Size. . .8” w x 6” dImpact Anvil Size. . .8” w x 6” dAnvil Material . . . . . SS or Hard Wood BlockAnvil Material . . . . . SS or Hard Wood BlockMax Drop Ht . . . . . .72” Max Drop Ht . . . . . .72” Max Impact Vel . . . 235.8 “/sec Max Impact Vel . . . 235.8 “/sec Max UUT Wt . . . . . 5lb Max UUT Wt . . . . . 5lb Max UUT Size . . . . 6” Between Gripping faces*Max UUT Size . . . . 6” Between Gripping faces*Min UUT Size . . . . 0”Min UUT Size . . . . 0”Overall Height . . . . 75” Standard, other heightsOverall Height . . . . 75” Standard, other heights

optional optional

* UUT may be gripped in various orientations.* UUT may be gripped in various orientations.


ESSM OperationESSM OperationEnvironment surface sample is installed on base anvil if requiredEnvironment surface sample is installed on base anvil if requiredUUT is mounted on carriage in desired orientationUUT is mounted on carriage in desired orientationAccelerometer is applied to UUT with main cable anchored to UUT Accelerometer is applied to UUT with main cable anchored to UUT carriage and linked with thin flexible non-encumbering cablecarriage and linked with thin flexible non-encumbering cableUUT carriage is raised to desired height to match simulationUUT carriage is raised to desired height to match simulationUUT carriage is released resulting in free fall toward anvilUUT carriage is released resulting in free fall toward anvilRestrained UUT maintains orientation till impactRestrained UUT maintains orientation till impactUUT Grippers are triggered to release prior to impact, AdjustableUUT Grippers are triggered to release prior to impact, AdjustableUUT impacts anvil free of tumbling at desired orientation and UUT impacts anvil free of tumbling at desired orientation and velocityvelocityShock data and pre-impact velocity are captured by GHI Shock data and pre-impact velocity are captured by GHI instrumentation to correlated with environment shock damageinstrumentation to correlated with environment shock damage


Feature FAQsFeature FAQsUUT Grippers (2) . . . . . . . . . . .2” Dia. Circular*UUT Grippers (2) . . . . . . . . . . .2” Dia. Circular*UUT Gripper Material . . . . . . . .Non conductive lowUUT Gripper Material . . . . . . . .Non conductive low density plasticdensity plasticReplaceable Grippers? . . . . . . YesReplaceable Grippers? . . . . . . YesReplaceable Anvil? . . . . . . . . . Yes*Replaceable Anvil? . . . . . . . . . Yes*Instrumentation, . . . . . . . . . . . .Shock AnalysisInstrumentation, . . . . . . . . . . . .Shock Analysis w/SRS optionalw/SRS optionalImpact Velocity . . . . . . . . . . . . .VS StandardImpact Velocity . . . . . . . . . . . . .VS StandardPrice, Delivery . . . . . . . . . . . . .Contact GHI Price, Delivery . . . . . . . . . . . . .Contact GHI

* Other configurations Optional* Other configurations Optional


Typical Design of Drop ReleaseTypical Design of Drop ReleaseUUT carriage release is set to desired UUT carriage release is set to desired drop height and clamps tightened.drop height and clamps tightened.

UUT carriage is raised to desired UUT carriage is raised to desired height for drop and latched to UUT height for drop and latched to UUT carriage release hook on carriage release hook on electromagnetic solenoid.electromagnetic solenoid.

This allows seamless height setting This allows seamless height setting for desired EUE simulation.for desired EUE simulation.

Actual velocity is monitored by GHI Actual velocity is monitored by GHI velocimeter.velocimeter.


UUT Gripper Design OverviewUUT Gripper Design Overview

Quick-adjustGripper Fingers

Orientation Rotation Lock


Minimum 2” Gripper Release Minimum 2” Gripper Release HeightHeight

Simulated product is 5” wide x 2.5“ thick x 2.5” deep, shown in free fall at 2” above impact surface.


2.5” Format Hard Disk Drive in 2.5” Format Hard Disk Drive in GrippersGrippers

Shown before release. Angle set to 15o impact angle.


Grasping FlexibilityGrasping Flexibility

2.5 Inch format hard disk drive shown grasped in the Z axis for a precise X-Y plane corner impact shock.


Grasping FlexibilityGrasping FlexibilityCell phone held for random position shock - object can be released an inch or two above impact surface.

Free fall can be set up to 72 inches above the impact surface.

Impact surface can be changed to comply with particular test protocols or to simulate actual environmental threats.

Pre-impact velocity will be measured as well as shock acceleration time history. SRS software for pyro type analysis is optional.


Strain Gauge UseStrain Gauge Use

Strain Gauges are compatible with the GHI Strain Gauges are compatible with the GHI Systems Data recording and analysis system.Systems Data recording and analysis system.

Film devices may require bridges and Film devices may require bridges and amplification, solid state devices are simpler.amplification, solid state devices are simpler.

Dynamic strain induced failures may be Dynamic strain induced failures may be measured.measured.


Grasper Release Action Grasper Release Action

Latch Bar

Release Spring

Latched Condition

Released Condition


HS Video Frame - CornerHS Video Frame - Corner


ESSM SummaryESSM Summary

ESSM simulates environmental drop height, impact velocity, and ESSM simulates environmental drop height, impact velocity, and impact surface.impact surface.Impact surfaces quickly replaceable for specific test protocols.Impact surfaces quickly replaceable for specific test protocols.Maintains Product Orientation to simulate actual events.Maintains Product Orientation to simulate actual events.Flexible UUT holding orientation options.Flexible UUT holding orientation options.High sample rate data system for impact velocity, uniaxial or High sample rate data system for impact velocity, uniaxial or triaxial shock acceleration and dynamic force – up to 1 MHz.triaxial shock acceleration and dynamic force – up to 1 MHz.Full Shock SRS S/W Module Optional. Full Shock SRS S/W Module Optional. Small footprint 18 “ x 16 “, easily relocated.Small footprint 18 “ x 16 “, easily relocated.Sturdy machine base, 120 lbs, prevents machine rocking. Sturdy machine base, 120 lbs, prevents machine rocking. Safe low voltage (12V DC) control, no compressed air needed.Safe low voltage (12V DC) control, no compressed air needed.Open design makes high speed video easy.Open design makes high speed video easy.


ContactContact

GHI Systems, Inc916 N. Western Ave. Suite 201

San Pedro, CA 90732Phone: 1-800-444-7978

Web Site: www.ghisys.com

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