Mechanical Modeling of Skinfold Compression

Slides:

Advertisements

Similar presentations

Introduction to Light Scattering A bulk analytical technique

Advertisements

Viscoelastic properties

Potentiostat Basics I’m Max Yaffe

Instructor: Dr. Richard Ward

Data Acquisition Concepts Data Translation, Inc. Basics of Data Acquisition.

A/D Conversion and Interfacing Physics 270. Voltmeters.

1 Anthropometry Spring 2014 BPK 303. Anthropometric Measures Fall Spring 2008.

System identification of the brake setup in the TU Delft Vehicle Test Lab (VTL) Jean-Paul Busselaar MSc. thesis.

Bike3.ppt1 H167 Hands-on Lab LAB 4: Stress and Strain.

Basic Questions Regarding All Analytical & Instrumental Methods (p 17-18) What accuracy and precision are required? How much sample do I have available,

Chapter 13 VibrationsandWaves. Hooke’s Law F s = - k x F s = - k x F s is the spring force F s is the spring force k is the spring constant k is the spring.

Arduino Week 3 Lab ECE 1020 Prof. Ahmadi. Objective Data acquisition (DAQ) is the process of measuring an electrical or physical phenomenon such as voltage,

Body Composition Techniques 2

Skinfold Measures.

CAPILLARY VISCOMETER Motivation

Procedure for Pro4 using Keithley

 What is Four Point Probing  How the system works  Pro 4 Set Up  Simple Calculations behind Four Point Probing  Procedure for using Pro4.

1. 2 LOOP DYNAMICS To keep track of deviations from the free-running frequency,

PHAT-TACO Experiment Pressure Humidity And Temperature Tests And Camera Observations Hannah Gardiner, Bill Freeman, Randy Dupuis, Corey Myers, Andrea Spring.

Engineering H192 - Computer Programming Gateway Engineering Education Coalition Lab 5P. 1Winter Quarter Stress and Strain Lab 5.

Granular Systems in Microgravity Michael L. Wilson The University of Tulsa Supported by Research Corporation.

M. Zareinejad 1. 2 Outline # Sensors –––– Sensor types Sensor examples #Actuators Actuator types Actuator examples ––––

Data Acquisition Overview 1 Using LabVIEW to acquire, analyze and record data.

Chapter 13 VibrationsandWaves. Hooke’s Law F s = - k x F s = - k x F s is the spring force F s is the spring force k is the spring constant k is the spring.

Mechanical Energy. Kinetic Energy, E k Kinetic energy is the energy of an object in motion. E k = ½ mv 2 Where E k is the kinetic energy measured in J.

Power and Power Measurement ENGR 10 – Intro to Engineering College of Engineering San Jose State University (Ping Hsu and Ken Youssefi) 1 Introduction.

Geology 5660/6660 Applied Geophysics Last time: Brief Intro to Seismology & began deriving the Seismic Wave Equation: Four types of seismic waves:  P.

Instrumentation Overview Spring 2012 The laboratory is a controlled environment where we can measure isolated physical phenomena with a view to eventual.

Electrical Resistance Electrical resistance is a measure of how difficult it is for electricity (electrons) to flow through a material. The units of resistance.

Mathematical Modeling of Serial Data Modeling Serial Data Differs from simple equation fitting in that the parameters of the equation must have meaning.

V. Rouillard  Introduction to measurement and statistical analysis DIGITAL SAMPLING - DIGITISATION Digital sampling is mainly used in data acquisition.

(Analog) Data Acquisition D. Gordon E. Robertson, PhD, FCSB.

Two-Dimensional Rotational Dynamics

The Kinetic Theory of Gases Temperature as a measure of average kinetic energy of the particles.

This section of work is also known as Hookes Law.

-Elastic Properties of Solids AP Physics C Mrs. Coyle.

LATHE VIBRATIONS ANALYSIS ON SURFACE ROUHHNESS OF MACHINED DETAILS LATHE VIBRATIONS ANALYSIS ON SURFACE ROUHHNESS OF MACHINED DETAILS * Gennady Aryassov,

M. Zareinejad 1. 2 Outline # Sensors –––– Sensor types Sensor examples #Actuators Actuator types Actuator examples ––––

Oscillations Readings: Chapter 14.

Body Composition Techniques. DIRECT ASSESSMENT The only direct methods for body composition assessment are dissection or chemical analysis Brussels Cadavre.

SOUNDS RECORDING AND REPRODUCTION The Volume of the Wave n The Amplitude is a measure of volume n The wave pink is softer than the blue wave. n It represents.

CELLS IN SERIES AND PARALLEL Lesson 9. Cells in Series  The electric potential given to a single electron by a dry cell has an average voltage of around.

Work Done by a Constant Force The work done by a constant force is defined as the distance moved multiplied by the component of the force in the direction.

Analog Conditioning1 Quantification of E.M.G.. Analog Conditioning2 RAW EMG Continuously changing positive and negative deflections. How do you reduce.

1 10. Harmonic oscillator Simple harmonic motion Harmonic oscillator is an example of periodic motion, where the displacement of a particle from.

Hooke’s Law & springs Objectives

Stats Methods at IC Lecture 3: Regression.

Energy of Simple Harmonic Motion

MECH 373 Instrumentation and Measurements

Instructor: Dr. Richard Ward

Current Electricity and Elastic Properties

Mechanical Vibrations

PGND 1st SEMESTER APPLIED NUTRITION-I

Smoothing Serial Data.

Instructor: Dr. Richard Ward

ELECTRICITY! SERIES AND PARALLEL CIRCUITS

Op-Amps and Analog Computers

Fracture Energy of Chicken Bones:

Quantification of E.M.G..

Smoothing Serial Data.

Work out the value of the unknown currents and potential differences (voltages). All the lamps are identical.

Oscillations Readings: Chapter 14.

Prepared by Dr. Mohamed Ahmed Awad

Series and Parallel Circuits

Resistance in Series and Parallel

Current Electricity and Elastic Properties

Eye Movement Tracking Device Senior Design Project: P09004

Gas Laws Chemistry.

Wavewin Sniffer 24 Configuration & Polling Software

Signals and Systems Lecture 2

Presentation transcript:

Mechanical Modeling of Skinfold Compression

Skinfold Measurement Skinfold calipers have springs Measured in mm Skinfold measurements are a compressed thickness of a double layer of skin plus adipose tissue Caliper pressure: e.g. 10 gm. mm-2 2 second timing Skinfold Modeling

Skinfold Compressibility Skinfold compressibility varies from site to site due to differences in skin thickness, skin tension and adipose tissue composition. Skinfolds in females are more compressible than in males. Skinfold compressibility decreases with age due to dehydration and changes in elastic properties of tissues A to D

Inexpensive Acquisition of Dynamic Skinfold Data Slim Guide Skinfold Caliper Potentiometer to provide analog signal A/D board Labview software Data saved in file to bring into EXCEL A to D

Dynamic Skinfold Compression A to D

Sampling Initially a calibration run is required Establishes gain and offset used to convert volts of signal to mm. of thickness Record 2 seconds of data Long enough to monitor any meaningful changes in skinfold compression 100Hz (100 data points per second) 10 trials per skinfold A to D

Calibration How do you change voltage values into thickness? A to D

OFFSET Volts Offset Time A to D

Calibration: Hold caliper in 0mm position, record voltage (offset) Hold caliper in 50mm position, record voltage 50 mm Voltage difference Volts 0 mm Offset Time Gain = Voltage difference / 50mm Skinfold thickness = (Voltage - Offset) / Gain

Signal Averaging: 10 trials (100 Hz)

Can we model this phenomenon?

Mechanical Modeling Spring Component Viscous Component Hook’s Law Spring Constant Viscous Component Dashpot Velocity dependent Coefficient of viscosity

Y = (F - bv) / a Simple Model Viscous and Elastic Components in Series where F=force, b = viscous, a = elastic a b A to D

Two components of spring and dashpot in parallel A to D

Mechanical Model b1 & b2 are coefficients of viscosity k1 & k2 are coefficients of elasticity A to D

Criteria of Goodness of Fit to Real Data Sum of Squares Shape of curve

Sex Differences A to D