Definition

1. Noun:
   • Overspeed, excessive speed: A state or condition where a moving object exceeds its designed, permitted, or safe speed limit. This term is often used in technical, engineering, and transportation contexts.
   • Overrun (in specific contexts): In mechanics or control systems, it can refer to a condition where a parameter exceeds its setpoint.

Usage Examples

• Noun:
  • Đồng hồ báo động bội tốc trên tàu hỏa. (The overspeed alarm on the train.)
  • Động cơ bị hỏng do vận hành ở chế độ bội tốc. (The engine broke down due to operation in overspeed mode.)
  • Hệ thống an toàn sẽ kích hoạt khi phát hiện bội tốc. (The safety system will activate when overspeed is detected.)

Advanced Usage

• Technical/Engineering Context: The term is predominantly used in specialized fields. In everyday conversation about driving too fast, words like "chạy quá tốc độ" are more common.
  • Phân tích nguyên nhân tai nạn cho thấy hiện tượng bội tốc của rotor. (Accident analysis indicated rotor overspeed.)

Variants and Related Words

• Quá tốc độ: Exceeding the speed (limit). This is a more general phrase.
• Tăng tốc: To accelerate. (Note: This describes the action of increasing speed, not the state of excessive speed.)
• Tốc độ cao: High speed. (Note: This describes a state of fast speed, not necessarily an excessive or dangerous one.)

Synonyms

• Survitesse (French loanword used in technical Vietnamese): Overspeed.
• Quá vận tốc: Exceeding velocity.

Notes on Meaning

• Primary Meaning: The core meaning is a technical state of exceeding a safe or set speed. It is not typically used as a verb (like "to speed" in English).
• Context Dependence: This word is almost exclusively found in technical manuals, safety reports, or engineering discussions related to vehicles, machinery, or rotating equipment.