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Archive - September 2021

Stability of a Four Wheel Moving in Curved Path
  • Mechanical

Stability of a Four Wheel Moving in Curved Path

September 30, 2021
by Santhakumar Raja
6 min read
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Consider any four wheel automobile (say, car) having wheels A, B, C and D, taking a turn towards left on a curved path, as shown in Fig (a). The wheels A and C are inner wheels, whereas B and D are outer wheels. While the vehicle...

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Gyroscopic Effect on Naval Ship
  • Mechanical

Gyroscopic Effect on Naval Ship (or Sea Vessels)

September 29, 2021
by Santhakumar Raja
4 min read
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Before discussing the gyroscopic effect on naval ships, first let us brief the terminology used in connection with the naval ship. Ship Terminology The front, top, and side views of a naval ship are shown in fig (a), (b) and (c)...

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Precessional Angular Motion
  • Mechanical

Precessional Angular Motion – theteche.com

September 29, 2021
by Santhakumar Raja
4 min read
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We already know that the angular acceleration is the rate of change of angular velocity. It is a vector quantity and can be represented both in magnitude and direction with the help of right hand screw rule. A body rotating in a...

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Wilson Hartnell Governor
  • Mechanical

Wilson Hartnell Governor (Radial Spring Governor)

September 28, 2021
by Santhakumar Raja
4 min read
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The spring controlled governor of the Wilson Hartnell type is shown in Fig. In this governor, the bell crank levers are pivoted at the ends of two arms which rotate with the spindle. The vertical arms of the bell crank lever...

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A simplified diagram to illustrate the main phases of database design
  • Computer Science

Using High Level Conceptual Data Models for Database Design

September 26, 2021
by Santhakumar Raja
3 min read
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Figure shows a simplified overview of the database design process. The first step shown is requirements collection and analysis. During this step, the database designers interview prospective database users to understand and...

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Schema Change Statement in SQL
  • Software

Schema Change Statement in SQL

September 21, 2021
by Santhakumar Raja
5 min read
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In this section, we give an overview of the schema evolution commands available in SQL, which can be used to alter a schema by adding or dropping tables, attributes, constraints, and other schema elements. This can be done while...

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Centrifugal Governors
  • Mechanical

Centrifugal Governors – Principle of Working

September 20, 2021
by Santhakumar Raja
4 min read
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Governor Arrangement This is the most common type of governor. In the centrifugal type governors, rotation of the crank shaft is taken to a vertical spindle through suitable gears. It consists of two balls of equal mass, which...

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Types of Governors
  • Mechanical

Governor Vs Flywheel – theteche.com

September 19, 2021
by Santhakumar Raja
3 min read
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Function of Governor The function of a governor is to automatically maintain the speed of an engine within specified limits whenever there is a variation of load. If the load on the engine increases, its speed decreases. So it...

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  • Computer Science

View (Virtual Tables) in SQL – theteche.com

September 15, 2021
by Santhakumar Raja
9 min read
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In this section we introduce the concept of a view in SQL. We show how views are specified, and then we discuss the problem of updating views (Virtual Tables) and how views can be implemented by the DBMS. Concept of a View in...

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Forced Vibrations with Harmonic Excitation
  • Mechanical

Forced Vibrations with Harmonic Excitation

September 14, 2021
by Santhakumar Raja
3 min read
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So far, we have discussed the free vibrations of systems where a system once disturbed from its equilibrium position executes vibration indefinitely because of its elastic properties. In actual practice, this system will come to...

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