venkateswarlu gaddam, gautam sharma, neelesh kumar, amod kumar, s.k. mahna nit kurukshetra central...
TRANSCRIPT
Venkateswarlu Gaddam, Gautam Sharma, Neelesh Kumar, Amod Kumar, S.K . Mahna
NIT KurukshetraCentral Scientific Instruments Organisation (CSIO)
Council for Scientific and Industrial Research(CSIR) Chandigarh ,India
IntroductionObjectiveMaterials and MethodsObservationsResultsConclusionReferences
GRF- Ground Reaction Force It is equal in magnitude and opposite in direction to the
force that the body exerts on the supporting surface through the foot .
Vertical GRF (Fz) & its importance- It is considered to be prominent amongst the three
components of the GRF and has importance in the gait analysis, clinical assessment etc.
Force Plate (FP)- To measure GRF in the human and animal locomotion.
Available FPs- AMTI FP, Bertec FP, Kistler FP Kistler FP- Standard Reference Tool Developed FP
Calibration Techniques Static calibration Dynamic Calibration
To measure static & dynamic calibration of Developed FP
Comparison of their (kistler FP & Developed FP) results
GRF MEASUREMENT WITH Kistler FP
Vertical component of ground reaction force
Subject walking on
force plate
Kistler Data Acquisition UnitPC with Analysis Software
Type- 9286B (Switzerland)Sensing Devices- Piezoelectric
sensorsCost-17 lacksPlates- aluminum
DAQ system for Bioware software
Type-5691A
To measure & analyze the acquired signal
Force calculationMoment calculationCenter of pressure (COP) calculation
Plates (2)-BrassSensors- Linear PotLength- 60 cmBreadth- 36 cmHeight- 7.4 cmSprings
arrangement
NI USB-625932 inputs,16
bit,32Ms/sMultifunction
I/O with correlated digital I/O for USB
LabVIEW –Laboratory Virtual Instrument Engineering Workbench
LabVIEW Signal Express-8.6
Major RoleSimulation Data AcquisitionInstrument ControlTesting & MeasurementsIndustrial automationData Analysis
Calibration- calibration is a comparison between measurements-one of known magnitude or set with one device and another measurement made in a similar way as possible with a second device.
Purpose- to check if the developed FP gives the same measurement readings as the Kistler FP, thereby checking the repeatability, sensitivity, linearity of VGRF for the Developed FP.
Static Calibration: Input- Fixed Loads Output- Volts
Dynamic CalibrationSubject- Human being Input- Applied Force from human feet during
walkingOutput- M-Shape curve in Volts
Static Calibration Dynamic Calibration
Load Vs Voltage
(N)
539 646 735
Range of Weight ( Kg)
Sensitivity of Kistler FP (mv/N)
Sensitivity of Developed FP (mv/N)
55-66 12.22 41.11
66-75 6.667 28.88
To evaluate Gait Parameters which are used for Prosthetic Knee quantification
In clinical assessments to know data analysis of a patient
Inexpensive
[1]. Senanayake S.M.N.A .(2004) Walking, Running and Kicking using Body Mounted Sensors. Proceedings of the 2004 IEEE. Conference on Robotics, Automation and Mechatronics Singapore. Pg 1141-1146.
[2]. Hynd D.,Hughes S C.,Evins D J.( 2000) The development of a long, dual-platform triaxial walkway for the measurement of forces and temporal-spatial data in the clinical assessment of gait. Proc Instn Engrs vol 214 Part H: pg 193-201.
[3]. Liu T., Inoue Y., Shibata K.(2009) 3D Force Sensor Designed Using Pressure Sensitive Electric Conductive Rubber. Journal of system design and dynamics, VOL 3 No 3 pg 282-295.
[4]. Roland E.S., Hulla M.L., Stover S.M., (2005) Design and demonstration
of dynamometric horseshoe for measurinh ground reaction loads of horses during racing conditions. Journal of Biomechanics 38 : pg 2102-2112.
THANK YOU!