Theory and Design for Mechanical Measurements
6th Edition
ISBN: 9781118881279
Author: Richard S. Figliola, Donald E. Beasley
Publisher: WILEY
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Chapter 9, Problem 9.16P
A diaphragm pressure transducer is coupled with a water-cooled sensor for high-temperature environments. Its manufacturer claims that it has a rise time of 10 ms, a ringing frequency of 200 Hz, and damping ratio of 0.8. Describe a test plan to verify the manufacturer’s specifications. Would this transducer have a suitable frequency response to measure the pressure variations in a typical four-cylinder engine? Show your reasoning.
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A four-stroke SI engine 0.08 m bore (d), 0.10 m stroke (L), is tested at full throttle at constant speed. The fuel supply is fixed at 0.0011333 kg/s and the spark plugs of the four cylinders are successively short circuited without change of speed, brake torque being correspondingly adjusted. The brake power (bp) measurements are the following:With all cylinders firing = 12.5 kWWith cylinder No. 1 cut off = 9 kWWith cylinder No. 2 cut off = 9.15 kWWith cylinder No. 3 cut off = 9.2 kWWith cylinder No. 2 cut off = 9.1 kWThe lower calorific (or heating value, LCVf) of the fuel is 44100 kJ/kg. The clearancevolume (Vcl) of one cylinder 70.0 x 103 mm3. Determine:(a) Indicated power (ip) of the engine under these conditions.(b) The indicated thermal efficiency (c) The relative efficiency of this engine.
A four-stroke SI engine 0.08 m bore (d), 0.10 m stroke (L), is tested at full throttle at constant speed. The fuel supply is fixed at 0.0011333 kg/s and the spark plugs of the four cylinders are successively short circuited without change of speed, brake torque being correspondingly adjusted. The brake power (bp) measurements are the following:With all cylinders firing = 12.5 kWWith cylinder No. 1 cut off = 9 kWWith cylinder No. 2 cut off = 9.15 kWWith cylinder No. 3 cut off = 9.2 kWWith cylinder No. 2 cut off = 9.1 kWThe lower calorific (or heating value, LCVf) of the fuel is 44100 kJ/kg. The clearancevolume (Vcl) of one cylinder 70.0 x 103 mm3. Determine:(a) Indicated power (ip) of the engine under these conditions.(b) The indicated thermal efficiency (c) The relative efficiency of this engine.
(d) Draw schametic diagram
As a mechanical engineer, you were asked by your supervisor to monitor the
operation of 4-stroke engine; as a result you got the following readings:
> Imep = 780 kN/ m2
> Engine speed = 800 rpm
> Brake Power 30 kW
%3D
%3D
> nm = 85 %
> B/S 0.7
You noticed also, that the inlet valve opens 10° before TDC and closes40° after
BDC and it takes 0.0035 second after ignition for the charge to gain maximum
pressure. Depending on the above readings, find the following engine
parameters:
a. The crank angle when the spark occursfor the maximum pressure to be at
TDC
b. The time period in second of inlet valve opening during one cycle
c. The diameter of the engine
d. The average piston speed
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Chapter 9 Solutions
Theory and Design for Mechanical Measurements
Ch. 9 - Prob. 9.1PCh. 9 - 9.2 State the following pressures as absolute...Ch. 9 - A water-filled manometer is used to measure the...Ch. 9 - Prob. 9.4PCh. 9 - 9.5 The pressure differential across an orifice...Ch. 9 - Show that the static sensitivity of an inclined...Ch. 9 - Prob. 9.7PCh. 9 - Show that the instrument (systematic) uncertainty...Ch. 9 - A strain gauge, diaphragm pressure transducer...Ch. 9 - Select a practical fluid to use in a manometer to...
Ch. 9 - An air pressure over the 200- to 400-N/m2 range is...Ch. 9 - Calculate the design-stage uncertainty in...Ch. 9 - The pressure drop across a valve through which air...Ch. 9 - Estimate the sensitivity (pF/mm) of a capacitance...Ch. 9 - A diaphragm pressure transducer is calibrated...Ch. 9 - A diaphragm pressure transducer is coupled with a...Ch. 9 - Prob. 9.17PCh. 9 - A 2.0 mm thick circular steel diaphragm (Em = 200...Ch. 9 - Estimate the differential pressure limit for a...Ch. 9 - The pressure fluctuations in a pipe filled with...Ch. 9 - What is the sensitivity of a pitot-static tube...Ch. 9 - A pitot-static pressure probe inserted within a...Ch. 9 - A tall pitot-static tube is mounted through and...Ch. 9 - The pressure transmission line response equation...Ch. 9 - Prob. 9.26PCh. 9 - Prob. 9.28PCh. 9 - Compare the inertance of water in a 0.2-m-long...Ch. 9 - The output from a resting healthy human adult...Ch. 9 - Prob. 9.31PCh. 9 - A pressure drop of 213 Pa is measured between two...Ch. 9 - Wall pressure taps (e.g., Figs. 9.19 and 9.21) are...Ch. 9 - Prob. 9.34PCh. 9 - Prob. 9.35PCh. 9 - Determine the resolution of a manometer required...Ch. 9 - A long cylinder is placed into a wind tunnel and...Ch. 9 - Prob. 9.38PCh. 9 - Prob. 9.39PCh. 9 - What is the sound pressure in pascals if the...Ch. 9 - A 6-mm-diameter pitot-static tube is used as a...Ch. 9 - For the thermal anemometer in Figures 9.31 and...Ch. 9 - Determine the static sensitivity of the output...Ch. 9 - A laser Doppler anemometer setup in a dual-beam...Ch. 9 - A set of 5,000 measurements of velocity at a point...Ch. 9 - Aircraft airspeed is measured using a pitot...
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