Category: BASIC THEORIES

BASIC THEORIES, MACHINERY, SHIP SURVEY3 Comments

Main Engine Shaft Alignment – Comprehension (Check conditions/ items/ tolerance/ docking/ undocking/ bearing loads or reactions/ jackup curve understanding)

Amarine Antonio

What is shaft alignment condition? “A static condition observed at the bearings supporting the propulsion shafts.” The basic procedure for determining vertical alignment of shafting and gears is to calculate, for the cold condition at time of aligning, a shape … Continue reading Main Engine Shaft Alignment – Comprehension (Check conditions/ items/ tolerance/ docking/ undocking/ bearing loads or reactions/ jackup curve understanding)

BASIC THEORIES1 Comment

Ship noise and vibration control

Amarine Antonio

Vibration is a complex phenomena happen on ship and machinery space, to understand and have the first sight of vibration assessment or further development, the fundamental of vibration theory is the great article for your pre-learning with such concept. In this topic, i’ll try to make it it as simple as possible to know-how the vibration analysis and modeling solutions in engineering term. As defined, any motion that repeats itself after an interval of time is called vibration or oscillation. 1st Basic modeling objects A vibratory system, in general, includes a means for storing potential energy – thế năng (spring or … Continue reading Ship noise and vibration control

BASIC THEORIES, CORROSION, ELECTRIC, HULL, SHIP SURVEY2 Comments

MARINE COROSSION AND PROTECTION (Part 1)

Amarine Antonio

To understand how marine corrosion protection works, it’s necessary to look in more detail in to the corrosion process. In this undesired chemical effect, the material can reach with different chemicals in its surroundings. The reaction can be divided into: Chemical reaction Electro-chemical reaction These reaction take place exclusively at the surface  of material. It’s possible the microscopic pits are formed by corrosion on the metal’s surface.The corrosion can also occur in existing crack. CHEMICAL REACTION In chemical reaction, there’s a charge transfer between the reactions. If the exchange of charge is local effect, then the resulting ” Chemical corrosion … Continue reading MARINE COROSSION AND PROTECTION (Part 1)

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X-BOW/STERN: Beyond the Conventional

Amarine Antonio

One such change which made a splash in the maritime industry was the introduction of X-bow by the Norwegian Ulstein Group. Since the inception of their first ship M/V Bourbon Orca in 2005 several other ship building yards/companies have used their design. The X-bow comprises of a backward sloping bow starting at the extreme front of the vessel. This results in a continuous and smooth bow shape as shown below. Designing such a vessel involves proper weight distribution in the forward region which allows for submission and sharper bow shape. Increased volume up front WITH SLOWLY INCREASE BUOYANCY  FORCE allows … Continue reading X-BOW/STERN: Beyond the Conventional

BASIC THEORIES1 Comment

2nd-Order Linear Differential Equations (2ndLDE)

Amarine Antonio

2nd-Order Linear Differential Equations – 2ndLDE A differential equation (DE) is an equation involving a function f(x) and its derivatives (x). (Phương trình Vi Phân tuyến tính cấp 2 – Vietnamese. Phương trình) Phương trình vi phân là 1 phương trình chứa biến độc lập x, hàm cần tìm là y = f (x) và các phương trình chứa biến x  như P(x) Q(x) và các cấp đạo hàm của nó.  Let’s forget what you have learned about Math during university 🙂 In Mechanical/Electrical engineering and Rotating equipment, the 2ndLDE is the most application in calculation of vibration, oscillation and circuit. Through this chapter, you … Continue reading 2nd-Order Linear Differential Equations (2ndLDE)