LabView Project: Virtual Instruments for Temperature Simulation & Pressure Measurement in , Exams of Electrical Engineering

Download LabView Project: Virtual Instruments for Temperature Simulation & Pressure Measurement in and more Exams Electrical Engineering in PDF only on Docsity! Cork Institute of Technology Bachelor of Engineering (Honours) in Mechanical Engineering - Stage 3 (NFQ - Level 8) Summer 2007 Electrical/Electronic Engineering (Time: 3 Hours) Instructions Answer FIVE questions. Examiners: Dr. R.A. Guinee Mr. P. Clarke Prof. M. Gilchrist Q1. (a) Describe how LabView works and discuss the function of the following items in such a programming environment. (i) Block Diagram (ii) Control Panel (4%) (b) It is required to simulate the statistical temperature variation of a reading room in a library due to student occupancy. A uniform random number generator (RNG) is employed for this purpose to model the temperature excursion between a low temperature value of 15°C and a high of 25°C. The RNG supplied with LabView runs with a clock speed of 1ms. Design a LabView virtual instrument with block and front panel diagrams to accomplish this task with the following features: (i) The RNG is run continuously upon activation. (ii) A graphical display along with a digital readout of temperature variation. (iii) An input delay feature that retards the RNG output update to 10 minute intervals in order to simulate student arrival to and from the reading room. (iv) a display of the running mean temperature value. (10%) (c) What changes are necessary in the Virtual Instrument (VI) of part (b) to monitor the room temperature for a fixed period of 3 hours? Redraw the block diagram configuration to accommodate this fixed time period. (6%) [20%] 2 Q2. (a) Explain the features of the following functions in LabView VI design: (i) For Loop (ii) Shift Register (4%) using simple sketches of their respective graphical icons. (b) Design a VI, with block and front panel diagrams, that computes and displays the running average and instantaneous value from a pressure sensor with measurements ranging from 5 to 10 psi with the following in-built features: (i) a random number generator (RNG) is used to model the pressure variations at 5 sec intervals. Note the supplied LabView RNG operates with an internal clock speed of 1ms. (ii) 3 successive RNG outputs are used in the averaging process. (9%) (c) Modify the VI block diagram in part (b) to output the average value and the maximum and minimum pressure occurrence over a one-hour period only. (7%) [20%] Q3. (a) Describe the use of the following in VI design: (i) Case Structure (ii) Sequence Structure (iii) Formula node (6%) (b) Design a VI that uses a case structure to model the following process output: If i/p X ≥ 0 then o/p Y=4X+5; Else o/p Y= 6X2 +2; (8%) (c) Redesign the VI in part (b) using a formula node only and comment. (6%) [20%]