ABSTRACT

The title “Tensile strength Testing Machine for threads” implies the function of the machine. It is a machine used to measure the tensile strength and tenacity of threads. Our project was to design such a machine for small range capacity up to 150 N. Then the task was to construct the designed Machine by using indigenous materials. After the completion of the construction of the desired machine, it was necessary to test its performance. Hence various types of threads were tested by the machine and test results were compared.

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ABSTRACT

This project describes the necessity of CNG auto rickshaw and shows the production and assembly costs of the chassis as well as the production and assembly costs of a CNG auto rickshaw, the simulation of the chassis of the auto rickshaw, two dimensional (2D) drawings of various parts of the chassis, three dimensional (3D) drawings of the chassis and the stress analysis of the main bar of the chassis. The prices and costs are collected from the shops of various local markets, wholesale dealers, importers and Bangladesh Industrial Technical Assistance Centre (BITAC), Dhaka. The two dimensional (2D) drawings of various parts of the chassis and three dimensional (3D) drawings and simulation of the chassis have done by the “Auto CAD” (version 2006) software and the stress analysis of the main bar of the chassis has done by the “Solid Works” (version 2004) software. The cost verification showed that the cost of the CNG auto rickshaw manufactured with the help of the proposed simulation is much more less than the cost of the imported auto rickshaw and the proposed simulation is applicable for our countrywide transportation situation.

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ABSTRACT

In this study a batch-type fixed-bed fire-tube heating pyrolysis system has been designed and fabricated to produce liquid oil from scrap tires. Waste materials in the form of bicycle/rickshaw and truck scrap tire were pyrolysed in an internally heated batch-type fixed-bed fire-tube heating reactor system. The solid waste tires in pieces form was pyrolyzed in a 10 cm diameter and 27cm height reactor. The feed sizes were 10cmxO.5cmxO.25cm to 25cmx2cmx0.25cm. The reactor was heated by means of uniformly distributed electric coils of total capacity 2800wt and LPG burner preheated the purging N2 gas. The products were oils, char and gas. The liquid and char products were collected separately while the gas was flared into atmosphere. The product liquid was collected in a series of ice-cooled liquid collector. The maximum liquid and char yield were 52% and 35% for bicycle/rickshaw tire and 60% and 23% for truck tire for feed size of 10cmxO.5cmxO.25cm and 10cmx2cmxlcm respectively. The condensed pyrolytic oils were analyzed for their physical properties. The fuel properties compared were physical properties and calorific value. The heat values of the liquids of truck tire and bicycle/rickshaw are 40733 kJ/Kg and 41000 respectively. The results of the analysis showed that the oils were favorable viscosity and high heat value. From this study it is found that the pyrolysis of solid tire wastes may be a potential source of liquid hydrocarbon fuels.

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ABSTRACT

  

Design and construction of pressure testing rig are performed to test the hydrostatic pressure of PET bottles of particular sizes of 1 liter and 1/2 liter. PET bottles are excellent barrier materials and are widely used for soft drinks  and also for transmitting it from one place to another at high pressure. As a result most important or vital property of PET Bottle which has to be tested is its resistance to internal pressure developed by the form of carbon-dioxides. The main problem in the test is to seal the open end of the bottle with adapter. The hydraulic jack is used in our project as a pump. The goal of the present work is to study the pressure withstanding capacity of PET bottles and picked up the circumferential stress. It is determined by the rupture pressure of PET bottles.

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ABSTRACT

The work presented in this project deals with the design, construction and testing of a screw conveyor. Screw conveyor is one of the most important, cost benefit and time saving equipment. it most modern industry plant even in a coal mine, rock salt plant, there is a screw conveyor. It may be horizontal, inclined and vertical. A horizontal type screw conveyor has been design, constructed and tested. It consists of mainly a shaft, screw, bearing, feed hopper, discharge hopper, motor, pulley, belt, and stand. Flow of material is accomplished by the use of a rotating helix inside a fixed trough. The rotating helix or flighting provides a continuously inclined face, which operates a forward movement of the product. The speed of the screw conveyor can be changed of pulley diameter. The performance of the designed conveyor is found to run very satisfactory. The discharge of rice husk has been found to be 212 ft³/hr .

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ABSTRACT

This specification covers requirements and test methods for materials, dimensions and impact resistance for PVC. The pipe and fittings covered are suitable for the drainage and venting of sewage and certain other liquid wastes. A form of marking is also included. The pipe and fittings shall be made of virgin PVC compounds of defined specification. The pipe shall conform to the required stiffness, deflection load and flattening. The fittings shall be subject to hydrostatic burst pressure. The pipe and fittings shall be subject to impact resistance test.

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ABSTRACT

With the advancement of science and technology people are becoming more dependent on mechanical and electronic devices. These devices are also getting more and more sophisticated. The use of micro-controller and electronics control unit (ECU) can very easily fulfill this requirement. Applications would include robotics controllers, turning machine tools and other precise shaft positioning control environments etc. In the present work an automatically controlled window system using an electronics control unit has been designed and constructed. An electronics control unit has been developed to control the opening and closing of window. A sensor is made to sense the rain and a mechanical control unit using a dc servo motor and rack and pinion gear system is also developed to control the motion of window. Thus by using this, a automatic window control system sensed by rain is constructed.

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ABSTRACT

Automatic hydraulic ram is an environment friendly device uses energy resource to pump water for domestic or agricultural use. Since being superseded by pumps using electrical or fossil fuel energy nearly a century ago, they are now coming back into favour in many parts of the developing world. In the past, hydraulic ram has been designed by rules-of-thumb having limited scientific basis. On-site adjustment has been used in the hope of rectifying the inevitable shortcomings of this process and ideal performance is rarely achieved. The present proposal for optimum design allows relevant system parameters (including the beat frequency) to be selected prior to installation. The report shows how a ram system may be designed using two simple equations containing empirical factors dependent upon ram size, delivery head, material and wall thickness of the drive pipe and the configuration of the waste valve.

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ABSTRACT

Nowadays many types of design & modification have been done to the engines to improve its efficiency, capacity & to reduce the input energy of the engine. Reduction of input energy is one of the main objectives for these design & modifications. Here a four stroke petrol engine has been converted to compressed air engine. Some modification has been made to the petrol engine to convert it as a compressed air engine. As no fuel is used in compressed air engine, so carburetor system of the petrol engine has been omitted. The cam shaft lobe shape has been changed from oval shape to eye shape as a part of modification. It has been observed that, the performance parameter of the compressed air engine is almost similar if compared with the performance parameter of a standard petrol engine. A good efficiency has also been obtained. With some further improvement, this compressed air engine can be used globally. The use of this type of engine will reduce vehicles running cost. The exhaust of this compressed air engine is nothing but fresh breathable air. So use of this compressed air engine will reduce Global Warming.

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