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第 3講 振動傳感器應用 專題選講 清華大學航天航空學院 陸秋海 Vibration Transducers Application 20101101 現(xiàn)代實驗力學 實驗模態(tài)分析 運載工程與力學學部 VIB LAB981014 WJZ 力傳感器 Force Transducers 阻抗頭 Impedance Heads 速度傳感器 Velocity Transducers B 8776A50 7KHz 5 frequency response mounted with wax Excellent thermal stability 8774A50 8776A50 VIB LAB981014 WJZ Triaxial 8774A50 and 8776A50 Ceramic Shear Accelerometer Low cost high performance triaxial solution using ceramic shear accelerometers Hard anodized aluminum mounting cube for ground isolation at 3 grams mass The triaxial assemblies are 15 grams mass Use standard 1761B x cables Offered as a separate mounting cube or as an integrated assembly 8524 Mounting Cube 8774M05 8526 Mounting Cube 8776M05 8774M05 8776M05 VIB LAB981014 WJZ 8284A30 8286A5 and 8784A30 8786A5 Ceramic Shear Accelerometer Ceramic shear sensing element hermetic Stud mount normal temperature range 87xxA50 1000mv g 5g range 6Khz 5 21 gram mass 0 4mgrms threshold 80 deg C operating temperature 82xxA30 High Impedance 33pc g Range up to 2000g 0 1mgrms threshold 7Khz 5 frequency 150 deg C Special pricing for large quantities for OEM users Applications Original Equipment Manufacturers OEM Applications operating in a moderate temperature range and requiring lower cost 8284A30 8784A50 8286A30 8786A50 82XX High Impedance 87XX Low Impedance VIB LAB981014 WJZ Piezo Beam Sensor Architecture Cantilever Flexing beam Consists of two piezoelectric ceramic plates bonded together Plates polarized normal to the surface and electrically connected Beam deflection based upon motion Beam flexure under load creates an electrical charge which is buffered by internal signal conditioning electronics for a low impedance voltage output Low mass design excellent modal sensor B i m o rph S e n s i n g E l e m e n t E l e c tri c a l C o n n e c to r M o u n ti n g S u rfa c e H o u s i n g S i g n a l C o n d i ti o n i n g az az VIB LAB981014 WJZ 8628B x 8630C x 8632C X 8634B x 8638B x Piezo Beam Sensors Ceramic Bimorph sensing element with internal charge amplifier Temperature operation 0 to 65 degC Ground Isolated adhesive and stud mounting optional Lightweight sensors 5grams Ranges up to 50g based on type Frequency response up to 7KHz depending on type Low noise Threshold from 120mgrms to 1 0mgrms depending on type Triaxial Cube adapters available Fight Tested 8638B Cube Design for Corners and variable mounting surfaces Applications Modal and for vibration measurement on small structures 8630C 8636C8628B 8472 8634B 8470 8638B 8632C Trimount VIB LAB981014 WJZ PiezoBEAM Application Satellite Modal Testing Lockheed Martin s next generation A2100 version AX satellite in a Modal Test Instrumented with 305 channels of Piezobeam accelerometers VIB LAB981014 WJZ 8690C x 8692 16 gram mass Available Ranges 5 to 50g Frequency response up to 7KHz depending on type Low noise Threshold from 120mgrms Applications Modal and for vibration measurement on light structures 8690C x 8692C x 8692C x M1 VIB LAB981014 WJZ PiezoBEAM Hubble Telescope Solar Panels Modal analysis of solar panels Finite element Model Verification Vibrate through impact and a pulling force structure vibrates freely Objective Improve photographs from space VIB LAB981014 WJZ Application Modal Analysis on Cars Auto manufacturers use Triaxial accelerometer such as the P Beam 8692 to determine mode shapes and structural dynamics of the car bodies The objective is to optimize the car design associated with interior and exterior noise levels of the car VIB LAB981014 WJZ Color Coded Triaxial Accelerometers Quick and easy visual recognition of each triaxial accelerometer axis Ideal for multi channel and obscured mounting applications Axial identification with color coded letters X red Y Yellow and Z white Color coding is permanent and resistant to adhesives and handling common to vibration measurement Available with the M9 prefix for 5 10 and 50g accelerometers Shown are the 8795C x M9 8690C x M9 and 8692C x M9 VIB LAB981014 WJZ 8772A x Ceramic Shear Accelerometers Low weight high sensitivity ceramic shear ground isolated 10 32 connector Structural dynamics Modal applications Excellent temperature stability 0 5Hz to 6KHz 5 range 8 grams mass Adhesive mount glue epoxy or wax Accelerometer mounting clip supplied with each accelerometer Cubic design Mounting on 5 surfaces 8772A5 5g 1000mv g 8772A10 10g 500mv g 8772A50 50 g 100mv g VIB LAB981014 WJZ Application Satellite Force Limited Vibration Modal Testing Force Limited testing on satellites with accelerometers for control of the vibration levels Limit the vibration level based on force into the unit under test Instrument with accelerometers Monitor acceleration force and overturning moment When g level reached limit force Slip Table Test Unit Force Ring Shaker 1 stroke Acceleration Force Overturning Moment VIB LAB981014 WJZ 8770A x Impedance Head Ceramic shear accel Quartz Force Simultaneous force and acceleration at a coincident location on the structure Low Impedance Ranged for 5g 5lb 22N and 50g 50lb 222N 0 4mgrms 0 00013lb 0 00057N threshold 10mgrms 0 0013lb 0 0057N threshold For driving point response force and motion as a function of frequency Apparent Mass F A Inertance A F Impedance F V Apparent Stiffness F D Mobility V F Compliance D F Force Integral 10 32 Stud for rigidity 5000g range 8704B5000 currently available Applications Mid and Far Field Pyro Shock Impact testing Automotive and Packaging industry 8042 8044 High Impedance 8742A x 8743A100 Low Impedance 8704B5000