tử điểm
Definition
- Noun:
- Dead point / Dead center: A mechanical engineering term referring to the position in the cycle of a reciprocating engine (like a piston engine) where the piston reaches the extreme end of its stroke. At this point, the connecting rod and crank are in a straight line, and the force from the piston cannot cause the crank to rotate, requiring momentum from a flywheel to move past it.
- Neutral point / Point of zero force: More generally, it can describe any position in a mechanical system where applied force does not produce motion or torque.
Usage Examples
- Noun:
- Piston cần vượt qua tử điểm để động cơ tiếp tục hoạt động. (The piston needs to pass the dead center for the engine to continue operating.)
- Khi ở tử điểm, momen quay bằng không. (When at the dead center, the turning moment is zero.)
Advanced Usage
- In engineering discussions, the term is precise and technical.
- Việc xác định chính xác tử điểm trên trục khuỷu rất quan trọng. (Precisely determining the dead center on the crankshaft is very important.)
Variants and Related Words
- Điểm chết: This is a direct synonym and the more common modern Vietnamese term for "dead center" in mechanical engineering.
- Động cơ dừng ở điểm chết trên. (The engine stopped at top dead center.)
Synonyms
- Dead center: The primary technical synonym in English.
- Top dead center (TDC): The dead center when the piston is at its highest point.
- Bottom dead center (BDC): The dead center when the piston is at its lowest point.
Notes on Usage
- "Tử điểm" is a specialized technical term. In everyday conversation, it is rarely used. The synonym "điểm chết" is more prevalent in modern technical Vietnamese.
- It is almost exclusively used in the context of mechanics, engines, and machinery.