Shock And Vibration Tests On Smartscan Interrogators To-Books Pdf

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1 Introduction 3,1 1 Details of the Standard 3,2 Method 3. 2 1 Equipment Used 4,3 Results 5,3 1 Vibration Tests 5. 3 2 Shock Tests 7,4 Summary 9,Document Revision History. Issue Issue Date Change,A 28th July 2012 New document. Page 2 28 7 2012 7 049 3046A,1 INTRODUCTION, Subsea Production Control equipment for the oil and gas industry must conform to EN ISO 13628 6 This includes.
subsea equipment modules SEMs such as a SmartScan or SmartScope interrogator packaged in a pressure vessel. Part of the qualification test programme for this standard is shock and vibration testing to ensure that the equipment. is robust enough to stand up to the environment it will see during transportation handling installation and operation. Qualification tests may be performed on examples of the component to demonstrate its suitability for the. environment Additionally Environmental Stress Screening ESS tests may be applied to each example of the. component to weed out faulty or weak devices,1 1 DETAILS OF THE STANDARD. There are two standard qualification tests for electronic equipment Printed circuit boards PCBs and sub assemblies. shall be qualified to standard Q1 Modules consisting of a number of PCBs assembled into a rack type frame shall be. qualified to standard Q2 Individual circuit boards in the assembly do not require testing to Q1 if the whole module is. qualified according to Q2 The Equipment Under Test EUT must be monitored during all ESS random vibration. testing Monitoring during swept sine and shock testing is not required but may be preferred. The specifications for Q1 and Q2 are as follows, Vibration 5 to 25 Hz 2 mm displacement then 25 to 1000 Hz 5 g acceleration. Shock 30g 11 ms half sine, Vibration 5 to 25 Hz 2 mm displacement then 25 to 150 Hz 5 g acceleration. Shock 10g 11 ms half sine, The maximum vibration sweep rate is to be one octave per minute It must be low enough to allow any resonance to. build up to maximum amplitude A double sweep shall be performed from minimum to maximum frequency and. back again There must be no resonance having a mechanical amplification factor of greater than 10. The full test programme consists of vibration testing along three mutually perpendicular axes and four shocks in each. of six directions in the same axes, No significant damage shall have occurred after shock and vibration tests and the EUT must pass a test of 100.
functionality, Remove the rubber feet from the bottom of the SmartScan and undo the four tamper proof screws holding the two. halves of the enclosure together Mount the SmartScan to the test bracket 7049 1053 A with countersunk M3. screws passing through the bracket and into the four holes in the bottom of the SmartScan Use vibration resistant. threadlock if possible and do the screws up firmly Now mount the bracket to the top plate of the shaker with M6. socket screws Fit the feedback accelerometer into one of the tapped holes provided in the bracket. Power the SmartScan and connect the Ethernet Lead Connect test FBGs to all 4 output channels You may choose to. use a drop of threadlock on the FC APC connectors but take care not to contaminate the mating optical surfaces The. test FBGs must remain stable throughout the test period Suitable artefacts are athermal FBGs or any standard FBG. kept at a constant temperature ideally less that 1 C change during the test. Page 3 28 7 2012 7 049 3046A, Available athermal FBG wavelengths are 1535 1550 and 1565 nm. The test is to be carried out to Q2 as described above Build up to the specified vibration level in steps of 1 2 5 4 and. 5 g peak acceleration for example Record FBG data at 1 kHz or more for the whole of each sweep Take spectra at. the beginning and end of each sweep to look for changes in light output bearing in mind that any change may be due. to movement at the front panel connector rather than a fault in the EUT Pay attention to any signs of mechanical. resonance and make notes accordingly, An accelerometer may be fixed to the interrogator casing to record any resonances of the box and perhaps give an. indication of any resonances of internal components. Repeat the above steps to do tests in the other axes by using the test brackets 7049 1051 7049 1052 7049 1053. 7049 1054 The SmartScan and the test bracket need to be assembled according to assembly drawing 7049 2019. Figure 1 to 3 below shows the SmartScan mounted to the shaker and test bracket in 3 axes Note there are always. two accelerometers one control accelerometer and one response accelerometer mounted close to the tested. instrument Note further that the optical and Ethernet connectors are not special vibration resistant types. Figure 1 SmartScan on the shaker in axis 1 Figure 2 Smartscan on the shaker in axis 2 Figure 3 Smartscan on the shaker in axis 3. 2 1 EQUIPMENT USED, Electromagnetic Shaker LDS V650 with PA1000 L amplifier and FPS 10L field power supply. LDS COMETUSB Shaker Controller PC running LDS Value software. FBGs in athermal packaging apodised 100 reflectivity half width 0 25 nm. Accelerometer 1 DeltaTron 4514 001 calibrated 29 03 2012. Accelerometer 2 DeltaTron 4517 002 calibrated 21 02 2012. Page 4 28 7 2012 7 049 3046A,3 1 VIBRATION TESTS, Figures 4 6 and 8 below are plots of the amplitude of the control and response accelerometer signals vs vibration.
frequency Note that the control signals followed the ISO 13628 6 Q2 test specification very closely Some deviation. in the response accelerometer signals were noticed at higher frequencies but the amplitudes of the change was well. below the 10x threshold prescribed by the standard. The outputs of the SmartScan are shown in Figures 5 7 and 9 The test FBGs were scanned at 1250 Hz and the data. averaged down to 10 Hz to provide a low noise signal This makes it easier to see any underlying fluctuations in the. interrogator output The total deviations of measured FBG wavelength from the beginning to the end of the tests. were 0 5 pm This is less than the unaveraged resolution of the instrument 0 8 pm and well below the operating. stability specification of 5 pm,5 00 10 00 100 00 150 00. Frequency Hz, Figure 4 Axis 1 accelerometer frequency response plots Input 2 is the control accelerometer input 1 is the response accelerometer. Figure 5 Axis 1 frequency response of athermal test FBGs. Page 5 28 7 2012 7 049 3046A,5 00 10 00 100 00 150 00. Frequency Hz, Figure 6 Axis 2 accelerometer frequency response plots Input 1 is the control accelerometer input 2 is the response accelerometer. Athermal FBG Shift pm,0 25 50 75 100 125 150,Frequency Hz.
Figure 7 Axis 2 frequency response of athermal test FBGs. 5 00 10 00 100 00 150 00,Frequency Hz, Figure 8 Axis 3 accelerometer frequency response plots Input 1 is the control accelerometer input 2 is the response accelerometer. Page 6 28 7 2012 7 049 3046A,Athermal FBG Shift pm ch3. 0 25 50 75 100 125 150,Frequency Hz, Figure 9 Axis 3 frequency response of athermal test FBGs. 3 2 SHOCK TESTS, Figures 10 12 and 14 below are plots of the amplitude of the control and response accelerometer signals vs time The. figures represent one shock pulse that has been repeated four times within 20 seconds Note that the control signals. followed the ISO 13628 6 Q2 test specification very closely The control signal shock pulse has been slowly built up. to a maximum level of 100 by performing shocks at 25 50 and 75 The data was logged continuously during all. the steps Some deviations in the response accelerometer signals were noticed due to the system dynamics The. deviations were below those required by ISO 13628 6 levels. The outputs of the SmartScan are shown in Figures 11 13 and 15 The test FBGs were scanned at 1250 Hz and the. data averaged down to 25 Hz to provide a low noise signal This makes it easier to see any underlying fluctuations in. the interrogator output There is a linear shift on tested athermal FBGs due to the ambient temperature change The. total deviations of measured FBG wavelength from the beginning to the end of the tests were 0 5 pm This is less. than the unaveraged resolution of the instrument 0 8 pm and well below the operating stability specification of 5. pm There is a linear shift on tested athermal FBGs due to the ambient temperature change. 15 0000 6 4000,13 5000 input2 t input2 t,12 0000 input1 t input1 t.
6 5000 15 0000, 0 03 0 02 0 01 0 0 01 0 02 0 03 0 04 0 03 0 02 0 01 0 0 01 0 02 0 03 0 04. Time Seconds Time Seconds, Figure 10 Axis 1 accelerometer frequency response plots Input 2 is the control accelerometer input 1 is the response accelerometer. Page 7 28 7 2012 7 049 3046A,4x Shocks 4x Shocks,Athermal FBG Shift pm at 100 at 100. level level,positive negative,0 20 40 60 80 100 120. Figure 11 Axis 1 athermal test FBGs response,14 0000 3 9000.
input2 t 3 0000 input2 t,input1 t input1 t,3 9000 14 0000. 0 03 0 02 0 01 0 0 01 0 02 0 03 0 04 0 03 0 02 0 01 0 0 01 0 02 0 03 0 04. Time Seconds Time Seconds, Figure 12 Axis 2 accelerometer frequency response plots Input 2 is the control accelerometer input 1 is the response accelerometer. 4x Shocks 4x Shocks,at 100 at 100,Athermal FBG Shift pm. level level,positive negative,0 20 40 60 80 100 120. Figure 13 Axis 2 athermal test FBGs response,Page 8 28 7 2012 7 049 3046A.
14 0000 4 9000,input2 t input2 t,12 0000 3 0000,input1 t input1 t. 10 5000 1 5000,7 5000 1 5000,6 0000 3 0000,4 5000 4 5000. 3 0000 6 0000,1 5000 7 5000,1 5000 10 5000,3 0000 12 0000. 4 5000 13 5000,4 9000 14 0000, 0 03 0 02 0 01 0 0 01 0 02 0 03 0 04 0 03 0 02 0 01 0 0 01 0 02 0 03 0 04. Time Seconds Time Seconds, Figure 14 Axis 3 accelerometer frequency response plots Input 2 is the control accelerometer input 1 is the response accelerometer.
4x Shocks 4x Shocks,at 100 at 100,Athermal FBG Shift pm. level level,positive negative,0 20 40 60 80 100 120. Figure 15 Axis 3 athermal test FBGs response, The SmartScan interrogator passed a shock and vibration tests performed according to the ISO 13628 6. A small amount of mechanical amplification was recorded by a response accelerometer mounted on the. SmartScan enclosure during vibration test Further work will be performed to discover the source of this. frequency Note that the control signals followed the ISO 13628 6 Q2 test specification very closely Some deviation in the response accelerometer signals were noticed at higher frequencies but the amplitudes of the change was well below the 10x threshold prescribed by the standard The outputs of the SmartScan are shown in Figures 5 7 and 9

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