📚 Year 13 AQA Engineering: Vocabulary Quick-Memorisation Guide | AQA工程十三年级：术语速记指南
Mastering the precise terminology of AQA Level 3 Engineering is essential for analysing concepts, interpreting exam questions, and writing high-scoring answers. This guide organises key Year 13 vocabulary into themed sections to help you memorise and apply terms confidently. Each term is presented with a concise definition in both English and Chinese to reinforce bilingual understanding.
掌握AQA三级工程学的精确术语对于分析概念、理解试题和写出高分答案至关重要。本指南将十三年级的关键词汇按主题分类，帮助你自信地记忆和运用这些术语。每个术语均提供简明中英文释义，以便强化双语理解。
1. Mechanical Properties of Materials | 材料的机械性能
Stress (σ): The internal force per unit area within a material, measured in Pascals (Pa). It quantifies how load is distributed internally.
应力 (σ)：材料内部单位面积上的内力，单位为帕斯卡（Pa）。用于量化荷载在内部的分布情况。
σ = F / A
Strain (ε): The deformation per unit length resulting from applied stress. It is dimensionless, representing how much a material stretches or compresses relative to its original size.
应变 (ε)：由应力引起的单位长度变形量，无量纲，表示材料相对于原始尺寸拉伸或压缩的程度。
Young's Modulus (E): A measure of stiffness, defined as the ratio of stress to strain in the elastic region. High E indicates rigidity; low E indicates flexibility. It is a fundamental property in Hooke's Law.
杨氏模量 (E)：衡量刚度的参数，定义为弹性区内应力与应变的比值。E值高表示刚性强，E值低表示柔韧性好。它是胡克定律中的基本属性。
σ = E ε
Yield Strength: The stress at which a material begins to deform plastically. Beyond this point, permanent deformation occurs, and the material will not return to its original shape.
屈服强度：材料开始发生塑性变形时的应力。超过此点，将产生永久变形，材料无法恢复原状。
Toughness: The ability of a material to absorb energy up to fracture, represented by the area under the stress-strain curve. Tough materials can withstand impact without breaking.
韧性：材料在断裂前吸收能量的能力，以应力-应变曲线下方面积表示。韧性材料能承受冲击而不破裂。
Fatigue: The weakening of a material caused by repeated cyclic loading. Even at stresses below yield strength, micro-cracks can grow over time and lead to sudden failure.
疲劳：由反复循环载荷引起的材料弱化现象。即使应力低于屈服强度，微裂纹也会随时间扩展并导致突然失效。
2. Material Science and Classification | 材料科学与分类
Ferrous Metals: Metals containing iron as the primary component. They are typically magnetic and susceptible to rust. Examples include steel and cast iron.
黑色金属：以铁为主要成分的金属。通常具有磁性且易生锈。例如钢和铸铁。
Non-ferrous Metals: Metals that do not contain significant amounts of iron. They offer corrosion resistance and light weight. Examples: aluminium, copper, titanium.
有色金属：不含大量铁的金属。具有耐腐蚀性和轻质特点。例如铝、铜、钛。
Alloy: A mixture of a metal with other elements to enhance properties such as strength, hardness, or corrosion resistance. Stainless steel (iron, chromium, nickel) is a common alloy.
合金：金属与其他元素混合以提高强度、硬度或耐腐蚀性等性能。不锈钢（铁、铬、镍）是常见的合金。
Composite: A material made from two or more constituent materials with significantly different physical or chemical properties. The combination produces characteristics superior to the individual components. Carbon fibre reinforced polymer (CFRP) is a typical example.
复合材料：由两种或多种物理或化学性质显著不同的组成材料制成的材料。其组合特性优于单一组分。碳纤维增强聚合物（CFRP）是典型例子。
Heat Treatment: Controlled heating and cooling processes used to alter the microstructure and thus the mechanical properties of metals. Annealing softens, quenching hardens, and tempering reduces brittleness after quenching.
热处理：通过控制加热和冷却过程改变金属的微观结构，从而调整其机械性能。退火软化，淬火硬化，回火则降低淬火后的脆性。
Phase Diagram: A chart showing the equilibrium states of a material at different temperatures and compositions. For steel, the iron-carbon diagram is essential to understand austenite, ferrite, and cementite transformations.
相图：显示材料在不同温度和成分下的平衡状态的图表。对于钢而言，铁碳相图是理解奥氏体、铁素体和渗碳体转变所必需的。
3. Manufacturing and Process Engineering | 制造与工艺工程
CNC (Computer Numerical Control): A manufacturing method where pre-programmed software dictates the movement of factory tools and machinery. It allows for high precision and repeatability in cutting, drilling, and milling.
计算机数控 (CNC)：通过预编程软件控制工厂工具和机械运动的制造方法。可实现切割、钻孔和铣削的高精度与重复性。
CAD/CAM: Computer-Aided Design (CAD) involves creating 2D or 3D models of products. Computer-Aided Manufacturing (CAM) uses those digital models to generate toolpaths and machine code. Together they streamline production from concept to finished part.
CAD/CAM：计算机辅助设计（CAD）用于创建产品的二维或三维模型。计算机辅助制造（CAM）则利用这些数字模型生成刀具路径和机器代码。两者结合可简化从概念到成品的生产流程。
Additive Manufacturing: Building objects layer by layer from a digital model, commonly known as 3D printing. It minimises material waste and enables complex geometries.
增材制造：根据数字模型逐层构建物体的方法，即通常所说的3D打印。它能减少材料浪费并实现复杂几何形状。
Subtractive Manufacturing: Processes that remove material from a solid block to achieve the desired shape, such as milling, turning, or drilling. Conventional machining is subtractive.
减材制造：从实体块上移除材料以获得所需形状的工艺，如铣削、车削或钻孔。传统机加工均属于减材制造。
Casting: Pouring molten metal into a mould cavity where it solidifies. Sand casting and die casting are common techniques, suitable for producing complex shapes in a single piece.
铸造：将熔融金属注入模腔后凝固成形。砂型铸造与压铸为常用技术，适合单件生产复杂形状。
Welding: Joining materials, usually metals, by melting the workpieces and adding a filler material to form a strong joint. Arc welding and MIG welding are typical processes.
焊接：通过熔化工件并添加填充材料来连接材料（通常为金属）以形成坚固接头的工艺。电弧焊与MIG焊是典型工艺。
4. Structures and Fluid Mechanics | 结构与流体力学
Bending Moment: The internal moment in a beam that causes it to bend. It is calculated at any cross-section and used to determine the beam's maximum stress and deflection.
弯矩：使梁发生弯曲的内力矩。可在任意横截面计算，用于确定梁的最大应力和挠度。
Shear Force: The internal force parallel to the cross-section of a beam, resisting sliding. The shear force diagram helps locate critical sections where failure might occur.
剪力：平行于梁截面的内力，抵抗滑移。剪力图有助于定位可能发生破坏的危险截面。
Deflection: The degree to which a structural element bends or displaces under a load. Excessive deflection can cause serviceability issues even if the structure remains safe.
挠度：结构构件在荷载下弯曲或位移的程度。即便结构安全，过度挠度也可能引发使用性问题。
Bernoulli's Principle with a decrease in pressure or potential energy. Expressed as: p + ½ρv² + ρgh = constant.
伯努利原理：对于沿流线流动的不可压缩、无黏性流体，流速增大时其压力或势能会相应降低。表达式为：p + ½ρv² + ρgh = 常数。
p + ½ρv² + ρgh = constant
Reynolds Number (Re) values indicate laminar flow and high values indicate turbulent flow. Critical in pipe design and aerodynamics.
雷诺数 (Re)：用于预测流态的无量纲数。Re = ρvL/μ，低值表示层流，高值表示湍流。在管道设计和空气动力学中至关重要。
Laminar Flow: Smooth, orderly fluid motion with parallel layers and no mixing between them. It occurs at low Reynolds numbers and is characterised by low friction losses.
层流：流体分层平行流动、互不混合的平稳有序运动。在低雷诺数下发生，摩擦损失小。
5. Electrical and Electronic Principles | 电气与电子原理
Ohm's Law: The fundamental relationship in electrical circuits: voltage (V) equals current (I) multiplied by resistance (R). It governs the behaviour of linear resistive components.
欧姆定律：电路中的基本关系：电压（V）等于电流（I）乘以电阻（R）。适用于线性电阻元件。
V = I R
Power (P) ctrical energy is transferred. In DC circuits, P = IV = I²R = V²/R. Measured in watts (W).
功率 (P)：电能转换的速率。在直流电路中，P = 电流 × 电压 = I²R = V²/R。单位为瓦特（W）。
Capacitance: The ability of a component to store electrical charge. A capacitor stores energy in an electric field; its value is measured in farads (F). Capacitors block DC but pass AC signals.
电容：元件储存电荷的能力。电容器在电场中储存能量，单位为法拉（F）。电容器隔断直流而允许交流通过。
Inductance: The property of a conductor that opposes changes in current, generating a magnetic field. An inductor stores energy in a magnetic field; unit is the henry (H).
电感：导体阻碍电流变化的属性，同时产生磁场。电感器在磁场中储存能量，单位为亨利（H）。
Transistor: A semiconductor device used to amplify or switch electronic signals. Bipolar junction transistors (BJT) and MOSFETs are fundamental building blocks of modern electronics.
晶体管：用于放大或开关电子信号的半导体器件。双极结型晶体管（BJT）和MOSFET是现代电子学的基本构建模块。
Operational Amplifier (Op-amp): A high-gain integrated circuit with differential inputs, used in signal conditioning, filtering, and mathematical operations. Ideal characteristics include infinite input impedance and zero output impedance.
运算放大器：具有差分输入的高增益集成电路，用于信号调理、滤波和数学运算。理想特性包括无限输入阻抗和零输出阻抗。
6. Control Systems and Automation | 控制系统与自动化
Open-loop Control: A control system in which the output is not compared with the desired input; correction cannot be applied automatically. A simple timer-operated heater is an example.
开环控制：输出不与期望输入进行比较的控制系统，无法自动修正。由定时器控制的加热器就是一个例子。
Closed-loop (Feedback) Control: A system that continuously monitors the output, compares it with the setpoint, and adjusts accordingly. It ensures accuracy even with disturbances.
闭环（反馈）控制：持续监控输出、与设定期望进行比较并相应调整的系统。即使存在扰动也能保证精度。
Transfer Function: A mathematical representation of the relationship between the input and output of a linear time-invariant system in the Laplace domain. It simplifies analysis of dynamic response.
传递函数：在线性时不变系统中，以拉普拉斯域形式表示输入与输出关系的数学表达。可简化动态响应分析。
PID Controller: A proportional–integral–derivative controller that combines three corrective actions to minimise error. Proportional responds to present error, integral to past error accumulation, and derivative to predicted future error.
PID控制器：比例-积分-微分控制器，结合三种修正作用以最小化误差。比例项响应当前误差，积分项考虑过去误差累积，微分项预测未来误差。
Sensor: A device that detects physical quantities such as temperature, pressure, or position and converts them into a measurable signal. Sensors are the eyes and ears of a control system.
传感器：检测温度、压力或位置等物理量并将其转换为可测量信号的装置。传感器是控制系统的“感官”。
Actuator: A component that converts a control signal into physical motion, such as a motor, solenoid, or hydraulic cylinder. It executes the commands from the controller.
执行器：将控制信号转换为物理运动的部件，如电机、电磁阀或液压缸。它负责执行控制器的指令。
7. Thermodynamics and Fluid Power | 热力学与流体动力
First Law of Thermodynamics ΔU = Q - W, where U is internal energy, Q is heat added, and W is work done by the system.
热力学第一定律：能量既不能被创造也不能被消灭，只能转移或转化。对于封闭系统：ΔU = Q - W，其中U为内能，Q为加入的热量，W为系统对外做功。
Conduction: Heat transfer through a solid material due to molecular vibration and free electron movement. Metals are good conductors; insulators like foam have low thermal conductivity.
热传导：通过固体材料内部分子振动和自由电子运动进行的热量传递。金属是良导体，泡沫等绝缘体导热系数低。
Convection: Heat transfer in fluids (liquids or gases) caused by the movement of the fluid itself. Natural convection arises from density differences; forced convection uses fans or pumps.
热对流：流体（液体或气体）中因流体自身运动引起的热量传递。自然对流源于密度差异，强制对流借助风扇或泵。
Hydraulic System: A power transmission system that uses pressurised liquid (oil) to generate, control, and transmit force. Pascal's Law is the underlying principle: pressure applied to a confined fluid is transmitted undiminished in all directions.
液压系统：使用加压液体（油）产生、控制和传递动力的传动系统。其基础原理为帕斯卡定律：施加于密闭流体的压力会毫不减弱地向各个方向传递。
P₁ = P₂, F₁/A₁ = F₂/A₂
Pneumatic System: Similar to hydraulics but uses compressed air or gas. Pneumatics are clean, lightweight, and suitable for high-speed operations, though limited in force compared to hydraulics.
气动系统：与液压类似但使用压缩空气或气体。气动系统清洁、轻便，适用于高速操作，但力输出较液压有限。
Flow Rate (Q) pically m³/s. In a pipe, Q = A v, where A is cross-sectional area and v is fluid velocity.
流量 (Q)：单位时间内通过某点的流体体积，通常单位为m³/s。在管道中，Q = A v，其中A为截面积，v为流速。
8. Engineering Design and Communication | 工程设计及交流
Design Specification: A detailed document outlining the essential requirements, constraints, and performance criteria for a product or system. It serves as the blueprint for development and evaluation.
设计规范：详细说明产品或系统基本需求、约束条件和性能标准的文件。它作为开发和评估的蓝图。
Feasibility Study: An analysis that assesses the practicality, cost, technical capability, and potential return of a proposed engineering project before full-scale development.
可行性研究：在全面开发之前，评估拟议工程项目的实用性、成本、技术能力和潜在回报的分析。
Prototyping: Building a preliminary model to test concepts, functionality, and ergonomics. Rapid prototyping using 3D printing or CNC allows quick iteration and refinement.
原型制作：构建初步模型以测试概念、功能和人机工程。利用3D打印或CNC的快速原型技术可快速迭代和完善。
FEA (Finite Element Analysis): A numerical method that divides a complex structure into small elements to predict stress, strain, deflection, and thermal behaviour. It enables optimisation before physical testing.
有限元分析 (FEA)：一种将复杂结构划分为小单元以预测应力、应变、挠度和热行为的数值方法。可在物理测试前进行优化。
BOM (Bill of Materials): A comprehensive list of all raw materials, components, sub-assemblies, and quantities required to manufacture a product. It is essential for procurement and cost estimation.
物料清单 (BOM)：列出制造产品所需全部原材料、零部件、子组件及其数量的综合清单。对采购和成本估算至关重要。
Tolerance: The permissible limit of variation in a physical dimension. Tight tolerances ensure interchangeable parts in mass production; they are specified using limits and fits standards.
公差：物理尺寸允许的偏差范围。严格的公差确保大批量生产中零件的互换性，通过极限与配合标准进行规定。
9. Quality Assurance and Non-destructive Testing | 质量保证与无损检测
QA (Quality Assurance): Process-oriented activities that ensure quality requirements are met during design and production. It focuses on preventing defects through systematic procedures.
质量保证 (QA)：面向过程的活动，确保在设计和生产过程中满足质量要求。侧重于通过系统化程序预防缺陷。
QC (Quality Control): Product-oriented inspection and testing to identify defects in finished items. QC verifies that the output conforms to specifications.
质量控制 (QC)：面向产品的检查和测试，以识别成品中的缺陷。QC验证输出是否符合规范。
NDT (Non-destructive Testing): Techniques that evaluate material integrity without causing damage. Common methods include ultrasonic testing, radiography, dye penetrant inspection, and magnetic particle testing.
无损检测 (NDT)：不损害材料即可评估其完整性的技术。常用方法包括超声波检测、射线照相、着色渗透检测和磁粉检测。
Calibration: The process of comparing a measurement instrument against a known standard to ensure accuracy. Regular calibration maintains traceability and reliability.
校准：将测量仪器与已知标准进行比对以确保精度的过程。定期校准可保持可追溯性和可靠性。
Tensile Test: A destructive test where a specimen is pulled until fracture to determine mechanical properties such as ultimate tensile strength, yield strength, and elongation. A stress-strain curve is generated.
拉伸试验：一种破坏性测试，将试样拉伸至断裂以确定极限抗拉强度、屈服强度和延伸率等机械性能。可生成应力-应变曲线。
Vickers Hardness Test: An indentation hardness test using a diamond pyramid indenter; the diagonal of the indentation is measured. It provides a continuous scale and is suitable for a wide range of materials.
维氏硬度试验：使用金刚石正棱锥压头的压痕硬度测试，测量压痕对角线长度。该测试提供连续硬度标尺，适用于多种材料。
10. Engineering Mathematics Toolkit | 工程数学工具箱
Vector: A quantity having both magnitude and direction, such as force, velocity, or displacement. Vectors are manipulated using resolution into components, dot product, and cross product in statics and dynamics.
矢量：既有大小又有方向的量，如力、速度或位移。在静力学和动力学中，通过分力分解、点积和叉积对矢量进行运算。
Scalar: A quantity with magnitude only, such as mass, temperature, or energy. Scalars follow ordinary arithmetic rules, unlike vectors.
标量：只有大小的量，如质量、温度或能量。标量遵循普通算术规则，与矢量不同。
Differentiation: The calculus operation used to find the rate of change, such as velocity (derivative of displacement) or the gradient of a curve at a point. Essential for analysing motion and optimisation.
微分：微积分中用于求变化率的运算，如速度（位移的导数）或曲线在某点的斜率。对运动分析和优化至关重要。
Integration: The reverse process of differentiation, used to calculate areas under curves, work done, centres of mass, and accumulated quantities. Definite integrals provide numerical results.
积分：微分的逆运算，用于计算曲线下方面积、做功、质心和累积量。定积分给出数值结果。
Trigonometric Functions: sine (sin), cosine (cos), and tangent (tan) relate angles to side ratios in right-angled triangles. Widely used in force resolution, wave analysis, and phasor diagrams.
三角函数：正弦（sin）、余弦（cos）和正切（tan）将角度与直角三角形边长比联系起来。广泛用于力的分解、波形分析和相量图。
Complex Numbers: Numbers expressed as a + bi, where i² = –1. In AC circuit analysis, complex impedance extends Ohm's Law by combining resistance and reactance, simplifying phase calculations.
复数：以 a + bi 形式表达的数，其中 i² = –1。在交流电路分析中，复数阻抗结合电阻与电抗，扩展了欧姆定律，简化相位计算。
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