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Chapter 7 INTC 1305 – 01 SPEED and VIBRATION Vern Wilson Instruments designed to monitor chemical and physical properties of a process stream These are instruments that can continuously monitor a process stream The analyzer system catches a sample, sends it to an analyzer, conditions the sample, analyzes the sample and returns the sample to the system Speed and Vibration Vibration is a random movement of an object Vibration meters are used to measure velocity, acceleration or displacement Usually have a sensor, amplifier and output devices Vibration is measured in large or high speed equipment to prevent catastrophic failure AXIAL – side to side RADIAL – out of round Measured with an Accelerometer ◦ Self activated – Piezoelectric sensor ◦ Heavy metal sitting on a crystal – strained in motion ◦ Creates a voltage output which is transduced and converted to a digital readout Speed = Distance traveled per unit of time Velocity = Speed with a direction Speed is measured with a sensor and a readout Sensors include tachometers, induction measurement, or magnetic proximity signal Speed is either rectilinear (mph) or rotational (rpm) Car speed is measured by rpm and tire circumference 1 1 1 1 1 1 mile = 5280 feet knot = 1.15 miles kilometer = 0.621 miles yard = 36 inches meter = 39.37 inches mile = 1.61 kilometers Speed = 70 mph Distance to travel = 140 miles How long does it take = 140 m/ 70 mph = 2 hours Graham, Texas is about 165 miles Speed = 75 mph Calculate time to drive to Graham Time = 165 m / 75 mph 2.2 hours 2 hours and 12 minutes Determine the Velocity if the heading is 315° 315° = NW The velocity is 75 mph NW Pittsburgh is 1400 miles from Corsicana on a heading of 45° We are driving at 55 mph How long will it take? What is our velocity? We are 1250 miles from Atlanta, Georgia on a heading of 90° We are traveling at 180 knots How long will it take? What is our velocity? It is 116,160 feet to Blooming Grove, Texas You are walking at 1 mile every 14 minutes How long does it take for you to walk to Blooming Grove? It is 1300 miles to Los Angeles on a 270° heading We are driving at 53 mph How long will the trip take? What is our velocity?
