Instrumentation and Process Control > Force, Weight, and Motion Measurement

Force, Weight, and Motion Measurement

Course Number: 774

The Force, Weight, and Motion Measurement textbook defines force, stress, and strain and explains the operation of strain-gauge systems. It relates weight to mass and scales to balances. It also explains the operation of load-cell scales, belt scales, nuclear scales, and weigh feeders. It covers position measurements by means of proximity detection, air gauging, LVDT gauges, synchros, code disks, and other devices. It explains machine tool control and accelerometer operation and describes the measurement of angular velocity and acceleration, vibration detection, and machinery balancing.

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Chapter 1: Force, Stress, and Strain

Topics: Units of force; Static forces; Elasticity; Strain gauges; Gauge factor; Gauge configurations; Other force-measuring devices

Learning Objectives:

• Define force, stress, strain, and deformation in terms of the English and SI units used for their measurement.
• Describe the relationship between stress and strain (Hooke's law).
• Describe the operation and construction of various kinds of strain gauges.
• Identify the electrical circuits used with strain gauges.
• Describe the piezoelectric effect and the capacitance mat and discuss typical applications.

Chapter 2: Weight and Mass Measurement

Topics: Weight vs. mass; Acceleration; Spring scales; Balances; Load cell scales; Hydraulic, LVDT, and pneumatic load cells; Batch scales

Learning Objectives:

• Define and compare weight and mass, including SI and English units.
• Explain the relationship between a mass and the acceleration of that mass.
• Discuss Newton's first law of motion.
• Describe spring scales, equal-arm balances, and unequal-arm balances.
• Discuss the operating principles governing load cells.
• Describe the operation and application of industrial batch scales.

Chapter 3: Weighing Materials in Motion

Topics: In-transit weights; Belt-scale systems; Roller scales; Nuclear scale operation; Radiation detectors; Weigh feeders

Learning Objectives:

• Name the parts of a belt scale and explain how a typical belt scale operates.
• Discuss the use of roller scales.
• Describe the scale comparison, calibration chain, and electronic integrator methods of calibrating in-transit scales.
• Explain how radiation detectors work and describe the operation of a nuclear scale.
• Describe how continuous weigh feeders operate and discuss typical applications.

Chapter 4: Position Measurements

Topics: Micrometers; Dial indicators; Potentiometers; Tracer systems; Variable-reluctance transducer; Proximity detection; Air gauging; Moving-coil transducer; LVDT gauge; Inspection gauging

Learning Objectives:

• Describe how micrometers and dial indicators are used to gauge an object and to make a position measurement.
• Explain how precision potentiometers, tracer systems, variable-reluctance transducers, and proximity detectors measure linear position.
• Describe how air gauging is used to measure inside and outside diameters.
• Discuss the operation and uses of LVDT gauge heads.
• Explain how typical rotary potentiometers, synchros, and code disks converters operate.
• Discuss applications for extensometers and full-field devices.

Chapter 5: Acceleration, Vibration, and Shock

Topics: Speed vs. velocity; Radar devices; Machine tool control; Linear and angular acceleration; Accelerometers; Vibration; Balancing machinery

Learning Objectives:

• Compare speed and velocity and calculate speed from distance and time.
• Explain how the accelerometer works.
• Contrast direct and indirect speed measurement and give examples of each.
• Discuss the operation of LVDT, potentiometric, and piezoelectric accelerometers.
• Describe the undesirable effects of vibration and discuss ways of preventing them.

Select Chapter(s):

•    Chapter 1: Force, Stress, and Strain
•    Chapter 2: Weight and Mass Measurement
•    Chapter 3: Weighing Materials in Motion
•    Chapter 4: Position Measurements
•    Chapter 5: Acceleration, Vibration, and Shock

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