Download presentation
1
Acceleration-velocity-position
Outline Accelerometers Velocity Position + Misc!! Material from Fraden chap. 7 Fraden chap. 8 Wikipedia Web Analog Devices MEMSIC SINTEF
2
Position – velocity - acceleration
Oscillatory motion Position Velocity Acceleration Consequence 1: low frequency -> measure position or velocity high frequency -> measure acceleration
3
Consequence 2 Plotting position amplitude emphasizes low frequencies
Plotting acceleration emphasizes high frequencies Acceleration Velocity Fig 3: Bearing damage Frequency Velocity is the usual compromise Frequency Fig 2: Misalignment
4
Acceleration -> Position
Acceleration is independent of inertial system Can be measured without reference Can be measured in a closed container Position can be found by integrating twice:
5
BUT => Measure position if you can Or, get a grip on your errors
6
Accelerometer approaches
Piezoelectric Measure F Compression Bending Piezoresistive Stress/force based Parallell plate Comb AC Capacitive DC FP (Optical) Measure x Cantilever Fiber (Magnetic) Measure v Inductive Thermal
7
Capacitive spring based
8
Capacitive finger Analog Devices
9
Piezoresistive accelerometer
10
Piezoresistivt akselerometer 2
11
Termisk masse (luft)
12
Magnetic velocity measurement
13
Potentiometric level sensor
14
Tilt sensors
15
2D tilt sensor
16
Linear variable differential transformer LVDT
17
Eddy current sensor
19
Permanant magnet - Hall sensor
20
Permanent field 1
21
Permanent field 2
22
Position sensitive detector
24
Linear -> Rotary
25
Position encoders
26
Ultrasound time of flight
27
Impedance matching
28
Triangulering - GPS Wikipedia
Similar presentations
© 2025 SlidePlayer.com. Inc.
All rights reserved.