Monday, July 16, 2018
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Faculty of Engineering
/ Mechanical Engineering
Dynamics of machinery and vibrations laboratory, Mechanical Engineering Department, University of Isfahan
1.One and two degree of freedom oscillator and viscous dissipation
In this experiment, free vibrations in rotary systems with one and two degree of freedom are investigated. In case of one degree of freedom, a heavy flywheel that provides the system inertia is connected to the apparatus frame in one end and it is supported in a moving clamp at the opposite end. In case of two degree of freedom, the axis is connected to a flywheel that generated varies momentum inertia using different masses.
The viscous dissipation apparatus investigates the effect of a viscous liquid on the vibrating parameters of a rotary oscillator.
2.Free and forced vibration apparatus, Rigid body and spring with/without viscous dissipation
In this experiment, the main parameters of a vibrating system are calculated and the system feedback is investigated under free and forced conditions.
The apparatus comprises a horizontal beam with rectangular cross section that is connected to the main frame using a joint on one end, and a spring on the other end. A harmonic force is exerted on the beam using an unbalanced motor. The system dissipation can be controlled using an adjusting damper. A data acquisition system is utilized to record the vibrations.
3.Vibration dynamic damping system
In this experiment, the function of dynamic dampers and how it absorbs the vibrations are investigated. The apparatus comprises a beam with rectangular cross section that generates harmonic vibrations using an unbalanced motor. The vibration damper includes two spring strips with weight the move along the strips.
4.Gyroscope system
In the experiment the gyroscopic effect and the method of calculating rotational velocity using gyroscopic are investigated. The main motor rotates the shaft with adjustable speed using a belt. The gyroscope motor, at one end of the system with determined momentum inertia, provides adjustable angular momentum for the system. On the other side, the position of weights and optical measurement system are considered for determining the gyroscopic momentum.
5.Critical speed of rotating shafts
In this experiment, the methods of calculating the critical speed of rotary shaft, and vibrational modes under various loadings can be investigated. The system consists of a rigid base and two bearings, and a motor with variable speed that rotates the shaft using a coupling. In order to provide different types of supports, a central bearing or a fixed bearing can be utilized. Auxiliary weights are placed on the shaft for load balancing.
6.Governor system
In this experiment, the principle of operation, sensitivity, and the stability of different governors are evaluated. The system consists of Porter governor, Proell governor, and a Hartnell governor. A motor with adjustable speed and leveling rod of each governor provide the capability to record the dynamic analysis data. One of the main applications of the governor is to avoid rapid or slow rotation of the variable speed motor by adjusting the fuel consumption.
7.Cam
In this experiment, the cam profile is plotted according to displacement curve, and also the jump issue is investigated. Different cams are tightened at one end of the shaft with adjustable speed. Roller and flat cam followers that fit each cam are placed at the end of vertical shaft. The force exerted on the cam-follower is adjusted using a nut on top bar and different load weights.
8.Balancing system (Static and dynamic balancing of rotary shafts)
In this experiment, static and dynamic unbalances and their effect on the movement of the rotary machines are investigated. The static and dynamic balance system consists of a balancing shaft. The shaft movement is provided using a belt and pulley system that is connected to a 12 Volts motor. The apparatus is placed on a spring stool to absorb and monitor the system vibrations during unbalancing. Four rectangular blocks with disks that have eccentric holes are utilized to simulate different unbalancing conditions. The position of the blocks can be determined with linear and angular scales.
9.Hook joint mechanism
In this experiment, a kinematic analysis is performed on the hook joint and angle error at different shaft positions is investigated. One of the most common universal joints is hook joint that is utilized to connect the intersecting shafts. This mechanism is capable of examining the single joint and double joint (double hook) cases at different shaft angles. Inlet and outlet angles are recorded using dials on both end of the shaft, and the angle between two shafts can be adjusted using base bolts.


Mechanics of Materials laboratory, Mechanical Engineering Department, University of Isfahan
1. Tensile test machine
This apparatus with capacity of 150 kN is capable of performing main experiments to determine mechanical properties (e.g. Yield Strength, Ultimate Strength, Elasticity Module, etc.) for a wide range of materials. Moreover, by installing appropriate fixtures, other experiments such as flexural test, spring properties determination, creep and bulking tests can be performed. The general specifications of the apparatus are listed below:

General Specifications

Capacity

150 kN

Pillar distance

500 mm

Speed

0.001-500 mm/min

Dimensions

Dimensions

Weight

750 kg

Maximum length variation

550 mm

 2. Fatigue test machine
The main goal of this experiment is to determine lifetime of mechanical parts under dynamic loads, to study the relation between the lifetime of a compartment and applied stress, and also to determine the allowable stresses that result in infinite lifetime of a compartment. The apparatus consists of an electric motor and a shaft that is supported by two bearings. The test sample is fixed in Lathe Chuck at one end and in loading unit bearing at the other end. On the left side of the motor an optocoupler exists to determine the rotational speed. Once the sample is ruptured and the bearing is lifted, a micro-switch turns off the motor.
3. Plastic torsion test machine
The purpose of this experiment is to evaluate the relation between torque and torsion angle, to determine shear elastic modulus, shear yield strength, and shear ultimate strength based on G-T diagram.
The test sample is placed inside two jaws that one of them is connected to loading unit and the other one is connected to measurement unit. In the loading unit, the torque resulted from rotation of a shaft is transmitted by a gear box to the jaw and the test sample subsequently. The applied torque on the sample is determined based on the displayed number on the force gage.

4.Impact test machine
  In this experiment, the strength of metals is evaluated against impact loads and thermal effects. The Charpy test machine includes a hammer pendulum that provides the required stroke for breaking samples of different materials using its wedge. The absorbed energy can be calculated based on the swing height before and after the impact.
5. Buckling test
The stability of pillars, critical load concept and the effective parameters on this load, Euler theory and southwell plot method to find the load, will be studied in this experiment. The main body of the machine includes two rails on which two jaws travel according to the length of test piece. There are fixed supports and hinged supports placed on the jaws. A load cell connected to one of the jaws display the axial load on a monitor. By rotating the jack lever on the other jaw, a load is applied on the sample piece. An indicator gage measures the deflection.

6. Suspension bridge
In this experiment, the applications and design parameters of suspension bridges in different loading and structural combinations are investigated. The apparatus consists of a deck, loading hooks, and a main cable that is tightened in the supports connected to machine frame where load cells are located. The load cells determine the tension loads of cable. Movable hooks and support pulleys provide different loading condition and structural combinations, respectively. The monitor displays the load cells force in kilograms.
7. Three joint collar
In this experiment, the main purpose is to get familiar with the idea of increasing vertical load bearing in construction of some bridges and ceiling of buildings. The machine frame is rigid and all compartments are placed on it. The collar body is made of steel with electrostatic coating that has a groove in its upper section that the load moves along it. The pins are located at the two ends and the middle of the collar. Load cells are utilized to measure horizontal and vertical loads in one the supports.

8.Continuous-Span Beam
In this experiment the following items are studied; determination of Elasticity coefficient based on curvature of two hinged arch, research in three point anchor system, determination of beam deflection under different support conditions, investigation in the principle of superposition and Maxwell's law.
9.Strain gauge
The purpose of this experiment is to introduce the application and installation method of the strain gauges. In order to measure the actual stresses of a piece under performance conditions, a strain gauge is utilized. In this experiment, a strain gauge is placed on the top and bottom surface of a two hinged beam. The displayed number for voltage changes is multiplied by gauge coefficient to yield the strain and then the stress is calculated and compared with theory.

10.Asymmetrical bending and shear center
In this experiment, the effect of transverse loading on thin-walled members without vertical symmetry plane is investigated. The apparatus consists of three bases on which measuring gauges and loading mechanisms are located and different profiles (angle, channel, …) are tighten in a fixture. The displacement of each profile in different angles under asymmetric loading is measured and also non-twisting of profiles in case of loading on shear center is investigated.
11. Hardness testing machine
Brinell, Rockwell, and Vickers hardness standards for materials are determined in this experiment. Based on these standards for determination of hardness, penetrating tools with different shapes and under standard loads are utilized to make a minor deformation on the sample piece and the hardness value is determined by analyzing the deformation.

Auto Mechanic workshop - Mechanical Engineering Department, University of Isfahan

A view of auto-mechanic workshop
1. Education package for engine and gearbox (Peugeot 405, Samand, Pars Peugeot)
Technical specifications and belongings:
Engine: 4 cylinders, 1800 cc
Fuel system: petrol, Injection
Ignition system: Electronic
Cooling fluid: water
Lubrication system: pressurized by pump
Engine prime mover: single phase eletro-motor with 2-hp power, and reducer gearbox
Chassis: Electro-static coated metallic frame with 4 wheels
Belongings: starter, alternator, fuel rail, fuel injector, injection system compartments, oil filter, Gearbox Clutch, …
Dimensions: 1650×800×1300 mm

1. Education package for engine and gearbox (Pride Injector)
Technical specifications and belongings:
Engine: 4 cylinders, 1300 cc
Fuel system: petrol, Injection
Ignition system: Electronic
Cooling fluid: water
Lubrication system: pressurized by pump
Gearbox and differential: regular transaxle, 5 speed + reverse gear
Engine prime mover: single phase eletro-motor with 2-hp power, and reducer gearbox
Chassis: Electro-static coated metallic frame with 4 wheels
Belongings: starter, alternator, fuel rail, fuel injector, injection system compartments, oil filter, Gearbox Clutch, …
Dimensions: 1650×800×1300 mm

1. Education package for hydraulic steering and front suspension (Peugeot 405, Samand, Pars Peugeot)
Suspension system: Pillar (Macpherson)
Steering system: Rack type equipped with a powerful hydraulic system
Shock absorber: Telescope type – Hydraulic
Spring: spiral
Driver: Single phase electromotor with 2 hp power
Belongings: steering hydraulic pump, hydraulic tank, shock absorber, Front fascia and steer, rim and wheel
Total suspension system is placed on a virtual chassis with 4 wheels to move it on the floor.

1. Education package for direct injection engine and power transmission of hybrid Pride (Gasoline and CNG)
Purposes:
This package is designed for education and to gain skills regarding power generation, CNG fuel injection, cooling, power transmission, trouble shooting and engine timing systems.
Advantages:
  • Installation of engine, gearbox, and all related equipment's on a four wheel frame.
  • Engine frame that has spaces for an engine undertray, battery, CNG and Gasoline fuel tank, portable troubleshooting system, indicator set, Ignition switch, and a key panel for fault making on engine.
  • An engine with sensors, actuators, E.C.U., cabling in engine zone and behind dashboard, CNG gas board, and exhaust according with pride vehicle standard.
  • Equipped with a gasoline fuel tank with a floater, CNG fuel tank, electrical gasoline pump, fuel filter, air filter, radiator and cooling fan, battery, starter, alternator, …
  • Fault making capability using fault making key panel, trouble shouting, repair and timing of engine

  1. Education package for electrical system of Pride (Education panel)
Technical specifications and belongings:
Closet set dimensions: 1420×780×1715 mm
Panel dimensions: 1420×780×1895 mm
Battery: 12 volts 55 Amp-hour
Alternator: 3-phase
Alternator mover: single phase electromotor with 1.5 hp power
Belongings: full ignition system, starter, main switch, headlights, rear lights, ceiling lights, license plate lights, windshield wiper motor with on-off switches and levers, radio broadcast with antenna and speakers, central locking system, electric window regulator, electronic anti-theft system, cables and connecting wires,…

1. Fuel feeding and ignition system education panel for Samand/ Peugeot 405/ Pars Peugeot with test and troubleshooting capability
Technical specification:

  • Dimensions: 1400×600×1760 mm
  • Fuel tank floater
  • Fuel pressure regulator
  • Fuel filter
  • Gas manifold pre-heater
  • Indicator set
  • canister electric valve
  • cooling system liquid temperature sensor
  • gasoline electric pump
  • speed sensor
  • canister
  • oil pressure sensor
  • stepper motor
  • Gas manifold
  • Motor speed sensor
  • Fueling and ignition system troubleshooting lamp
  • Inlet air temperature sensor
  • High RPM fan sensor
  • Engine main switch
  • Air absolute pressure sensor, on inlet manifold (MAP)
  • Engine management and electronic controller unit (ECU)
  • Double coil
  • Double relay
  • Engine wiring
  • Dashboard wiring
  • Engine interface wiring
  • Electromotor prime mover
  • Inverter to control flywheel
  • Fuel injection system
  • Gas manifold potentiostat

Welding and Metalworking Workshop, - Mechanical Engineering Department, University of Isfahan

General view of the workshop
Introduction
The welding and metalworking workshop in mechanical engineering department is located in a 100 m2 area in East side of the university adjacent to the general administration building. In this workshop the following educational services are provided for students: arc welding, gas welding such as brass welding and oxy acetylene welding, CO2 welding, cutting, and metal working including filing, cutting, sheet metal working (e.g. fabrication of a piece using galvanized steel sheet and all sheet metal working tools), and spot welding.

Equipment's:
The welding and metalworking workshop has 7 inverter based ARC Welding Rectifiers Machine, a CO2 welding machine, an oxy acetylene welding machine, an Oxy-fuel welding and cutting machine, an electric sheet metal bending machine, an electric Guillotine machine for sheet metal cutting, a desktop iron scissor, and welding and metal working tools with the following specifications:

a) Inverter based rectifier
Specifications:

  1. Low depreciation and portability due to light weight
  2. Considerable reduction in electrical energy consumption by almost 40%
  3. Suitable for regular and heavy duty welding and also welding with different type of industrial electrodes including alkaline, Cellulose, rutile, etc.
  4. Small scale and suitable for training students
  5. High security due to electrical protection circuit for thermal shocks, network oscillation, and phase instability.
  6. Welding amperes up to 500 Amps
  7. Voltage and ampere gages

a) CO2 welding machine
Specifications:

  1. Downside splash and high quality weld
  2. High stability electric arc, adjustable penetration coefficient
  3. High speed welding
  4. Low depreciation with capsule portability
  5. Welding flexibility on steel, iron, aluminum, pipe and profile with different thicknesses
  6. Welding amperes up to 500 Amps
  7. Voltage and ampere gages

a) Electric bending machine
Specifications:

  1. Capability of using electric power to move arms and jaws during sheet bending operation
  2. Capability of manual operation during power outage
  3. Possibility of bending metal sheets up to 5 mm thickness
  4. Suitable for training students due to user friendliness

a) Electric Guillotine machine
Specifications:

  1. Capability of using electric power to move arms and jaws during sheet bending operation
  2. Capability of manual operation during power outage
  3. Possibility of cutting metal sheets up to 2 mm thickness
  4. Possible to remove the blade for sharpening
  5. Possible to apply metal sheets up to 1.5 meter width
  6. Speed control using a pedal, special protection guard for higher safety
  7. Suitable for training students due to user friendliness
Fluid Mechanics laboratory
The main purpose in this course is to introduce the applications of theoretic principles of fluid mechanics and experimental verification of these theories.
The following equipment's are available in this lab: a set-up to investigate the fluid friction in pipes, valves, fittings and flow rate measurement devices, an apparatus to investigate hydrostatic force, fluidized bed, water jet impact measurement system, an apparatus to investigate air flow in pipe, pumping system in parallel and series configuration, drag force measurement system.
An experimental set-up to investigate the fluid friction in pipes, valves, fittings and flow rate measurement devices:

This system consists of 5 pipes with different diameters of which one of them has virtual roughness, pump, water manometer, mercury manometer, and water flow rate measurement unit. There are sudden expansion and contraction, various valves, strainer, 90º and 135º bends considered along the pipe to investigate energy loss in each of them. In the last pipe, a pitot tube, a venturi flow meter, and an orifice plate is accommodated to introduce flow rate measurement devices.

Hydrostatic force experimental set-up:
This system consists of two transparent and concentric cylinders that rotates around the horizontal axes of the cylinders. There is an arm connected to the system lever with a pan at the end for balancing weights. The angle of the system is adjustable. The momentum around the lever is determined by adjusting the angle, placing different weights on the pan, and pouring water into the container. The purpose of this experiment is to measure the exerted force on a cylindrical surface due to water pressure and to locate the point of force.

Fluidized bed:
This apparatus consists of silicon particles, air compressor, orifice meter to measure air flow rate, and two manometers to measure pressure drop in the orifice meter and the fluidized bed. By changing the inlet air flow rate to the fluidized bed, the bed becomes fluidized from stationary condition. The main purpose of this experiment is to investigate the pressure drop relations in fluidized bed.

Water jet impact experimental set-up:
This system consists of a hydraulic table and a transparent cylinder that includes a nozzle and an obstacle that is located on the table. The flow rate of inlet water to the cylinder is adjusted and measured. The water jet hit a flat or spherical obstacle and the exerted force is measured using a weight that moves along the lever arm. The purpose is to investigate the exerted force by a water jet on a stationary obstacle (flat or spherical).

Air flow in pipe experimental set-up:
This apparatus consists of a 160 cm horizontal pipe, fan, inlet air adjusting damper, 4 pitot tubes, water manometer, and an orifice plate. The purpose is to investigate the boundary layer development inside fluid flow and to introduce the flow rate measurement devices.

Pumps in parallel and series configurations:
This apparatus consists of two centrifugal pumps with fixed and variable speeds, flow meter, pressure gauge, water container, and an ampere meter. The purpose of this experiment is to investigate the performance curve of pumps, and the effect of pump speed, and also to investigate the performance of pumps in parallel and series configuration in a circuit. In each experiment, the water flow rate, pressure, and in case of variable speed pumps, the pump speed and its electric current are measured.

 

Date: 1395/02/03
Review: 1679
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