📚 Year 13 OCR Engineering: Vocabulary & Terminology Quick Memory Guide | Year 13 OCR 工程：词汇术语速记指南
Mastering the precise technical vocabulary is essential for success in OCR A Level Engineering. This memory guide condenses high-frequency terms across all Year 13 topics—materials, mechanics, electronics, systems, and more—into clear, bite-sized definitions that help you recall concepts quickly during revision and exams.
掌握精确的技术词汇是 OCR A Level 工程取得成功的基石。这本速记指南将 Year 13 全部主题（材料、力学、电子、系统等）中的高频术语浓缩成清晰的短定义，帮助你在复习和考试中快速回忆概念。
1. Materials Science Terminology | 材料科学术语
Engineering materials are defined by their mechanical, thermal and electrical properties. Knowing these terms allows you to select and justify materials for real-world applications.
工程材料由其力学、热学和电学性质定义。理解这些术语使你能为实际应用选择和论证材料。
Young’s Modulus (E): The ratio of tensile stress to tensile strain in the linear elastic region, measured in Pa. It indicates a material’s stiffness.
杨氏模量 (E)：在线弹性区域内拉伸应力与拉伸应变之比，单位为 Pa。它表示材料的刚度。
Yield Strength (σᵧ): The stress at which a material begins to deform plastically. Beyond this point permanent deformation occurs.
屈服强度 (σᵧ)：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。
Ductility: The ability of a material to undergo significant plastic deformation before rupture, often measured by percentage elongation.
延展性：材料在断裂前能够承受大量塑性变形的能力，通常用延伸率衡量。
Hardness: Resistance to localized plastic deformation, typically from indentation. Measured by Brinell, Vickers or Rockwell tests.
硬度：抵抗局部塑性变形（通常为压痕）的能力，通过布氏、维氏或洛氏硬度测试测量。
Fatigue Limit: The maximum stress amplitude a material can endure for an infinite number of cycles without failure.
疲劳极限：材料能够承受无限次循环而不失效的最大应力幅值。
2. Mechanics and Structures | 力学与结构术语
Statics, dynamics and structural analysis rely on a core set of definitions that link forces, moments and deformation.
静力学、动力学和结构分析依赖一套将力、力矩与变形联系起来的核心定义。
Stress (σ): Force applied per unit area, σ = F/A. Normal stress acts perpendicular to the cross-section; shear stress acts parallel.
应力 (σ)：单位面积上的作用力，σ = F/A。正应力垂直于截面作用；剪应力平行作用。
Strain (ε): Deformation per unit original length, ε = ΔL/L₀. Dimensionless; can be tensile or compressive.
应变 (ε)：单位原始长度的变形量，ε = ΔL/L₀。无量纲，可以是拉伸或压缩应变。
Factor of Safety (FoS): Ratio of the material’s ultimate stress to the allowable working stress, designed to cover uncertainties.
安全系数 (FoS)：材料极限应力与许用工作应力之比，用于涵盖不确定因素。
Bending Moment: The internal moment that causes a beam to bend. It varies along the length and is crucial for beam design.
弯矩：使梁发生弯曲的内力矩。它沿梁长度变化，对梁设计至关重要。
Shear Force: The internal force acting parallel to the cross-section of a beam, tending to cause one part to slide past another.
剪力：平行作用于梁横截面的内力，倾向于使一部分相对另一部分滑移。
3. Fluid Mechanics Terms | 流体力学术语
Fluid behaviour is governed by continuity, energy and momentum equations. These terms appear in both theoretical and practical engineering contexts.
流体行为受连续性、能量和动量方程支配。这些术语出现在理论与应用工程情境中。
Viscosity (μ): A fluid’s internal resistance to flow. Dynamic viscosity μ is measured in Pa·s; kinematic viscosity ν = μ/ρ in m²/s.
粘度 (μ)：流体内抗流动的特性。动力粘度 μ 单位为 Pa·s；运动粘度 ν = μ/ρ，单位为 m²/s。
Reynolds Number (Re): Dimensionless number predicting flow regime: Re = ρvd/μ. Re < 2300 indicates laminar flow; >4000 turbulent.
雷诺数 (Re)：预测流态的无量纲数：Re = ρvd/μ。Re < 2300 为层流；>4000 为湍流。
Bernoulli’s Equation: For steady, incompressible, inviscid flow along a streamline: p + ½ρv² + ρgh = constant.
p + ½ρv² + ρgh = constant
伯努利方程：对于沿流线的定常、不可压、无粘流动：p + ½ρv² + ρgh = 常数。
Flow Rate (Q): Volume of fluid passing a section per unit time, Q = A × v. Conservation of mass gives A₁v₁ = A₂v₂ for incompressible flow.
流量 (Q)：单位时间内通过截面的流体体积，Q = A × v。对于不可压缩流，质量守恒给出 A₁v₁ = A₂v₂。
4. Thermodynamics & Heat Transfer | 热力学与传热术语
Power generation, engines and thermal systems are analysed using thermodynamics laws and heat transfer modes. Precision in language is vital here.
发电、发动机和热力系统通过热力学定律和传热模式进行分析。在此处术语精确至关重要。
First Law of Thermodynamics: Energy cannot be created or destroyed; ΔU = Q – W, where ΔU is change in internal energy, Q heat added, W work done by system.
热力学第一定律：能量不能凭空产生或消失；ΔU = Q – W，其中 ΔU 为内能变化，Q 为添加的热量，W 为系统对外作功。
Entropy (S): A measure of disorder or randomness in a system. In any spontaneous process the total entropy of an isolated system increases.
熵 (S)：系统无序或混乱程度的量度。在任何自发过程中，孤立系统的总熵增加。
Thermal Conductivity (k): A material property indicating its ability to conduct heat. Governed by Fourier’s law: q = -k dT/dx.
导热系数 (k)：表示材料导热能力的属性。遵循傅里叶定律：q = -k dT/dx。
Convection Coefficient (h): The proportionality constant in Newton’s law of cooling: Q = hA(T_surface – T_fluid). Used to calculate convective heat transfer.
对流传热系数 (h)：牛顿冷却定律中的比例常数：Q = hA(T_表面 – T_流体)。用于计算对流传热。
5. Electrical & Electronic Engineering | 电气与电子工程术语
From circuit analysis to semiconductor devices, a strong command of electrical terminology underpins design and fault-finding tasks.
从电路分析到半导体器件，牢固掌握电气术语是设计和故障排查任务的基础。
Ohm’s Law: V = IR, where V is potential difference in volts, I current in amperes, and R resistance in ohms.
欧姆定律：V = IR，其中 V 为电位差（伏特），I 为电流（安培），R 为电阻（欧姆）。
Kirchhoff’s Current Law (KCL): The algebraic sum of currents entering a node is zero. Based on charge conservation.
基尔霍夫电流定律 (KCL)：流入一个节点的电流代数和为零。基于电荷守恒。
Capacitance (C): The ability to store electric charge, C = Q/V, measured in farads (F). A capacitor resists changes in voltage.
电容 (C)：储存电荷的能力，C = Q/V，单位为法拉 (F)。电容器抵抗电压变化。
Inductance (L): A coil’s ability to oppose a change in current, storing energy in a magnetic field; measured in henries (H).
电感 (L)：线圈抵抗电流变化的能力，以磁场形式储存能量；单位为亨利 (H)。
Operational Amplifier (Op-Amp): A high-gain voltage amplifier with differential inputs. Key configurations include inverting and non-inverting amplifiers.
运算放大器：高增益差分输入电压放大器。关键组态包括反相和同相放大器。
6. Systems & Control Engineering | 系统与控制工程术语
Modern engineering increasingly involves integrating sensors, actuators and controllers. Understanding control vocabulary is essential for automation.
现代工程越来越多地涉及集成传感器、执行器和控制器。理解控制词汇对自动化至关重要。
Open-Loop Control: A system where the control action is independent of the output. No feedback is used to adjust the input.
开环控制：控制作用与输出无关的系统。不使用反馈来调整输入。
Closed-Loop (Feedback) Control: The output is measured and compared to a reference signal; the error drives the controller to reduce deviation.
闭环（反馈）控制：测量输出并与参考信号比较；误差驱控制器减小偏差。
Transfer Function (G(s)): The ratio of the Laplace transform of the output to the input, assuming zero initial conditions. Describes dynamic behaviour.
传递函数 (G(s))：输出与输入拉普拉斯变换之比，假设初始条件为零。描述动态行为。
PID Controller: Combines Proportional, Integral and Derivative actions to improve system response, eliminate steady-state error and reduce overshoot.
PID 控制器：结合比例、积分和微分作用，以改善系统响应、消除稳态误差并减少超调。
Transient Response: The part of the output that decays to zero after a disturbance. Characteristics include rise time, peak time and settling time.
瞬态响应：扰动后衰减至零的输出部分。特性包括上升时间、峰值时间和稳定时间。
7. Manufacturing Processes | 制造工艺术语
Designs must be translated into physical products. Terminology covering casting, forming, machining and joining ensures clear communication with production teams.
设计必须转化为实物产品。涵盖铸造、成形、机加工和连接的术语可确保与生产团队清晰沟通。
Casting: Pouring molten metal into a mould cavity where it solidifies. Sand casting, die casting and investment casting are common variants.
铸造：将熔融金属浇入模具型腔并凝固。砂型铸造、压铸和熔模铸造是常见变体。
Machining (Subtractive Manufacturing): Removing material using cutting tools on lathes, mills or CNC machines to achieve desired geometry.
机加工（减材制造）：在车床、铣床或 CNC 机床上使用切削刀具去除材料，以获得所需几何形状。
Additive Manufacturing (3D Printing): Building objects layer by layer from a digital model. Processes include FDM, SLA and SLS.
增材制造（3D 打印）：由数字模型逐层构建物体。工艺包括 FDM、SLA 和 SLS。
Forming: Shaping materials through plastic deformation, e.g., rolling, forging, extrusion and bending, without adding or removing material.
成形：通过塑性变形使材料成形，如轧制、锻造、挤压和弯曲，不增减材料。
Joining (Welding): Fusion of materials, typically metals, by applying heat/pressure with or without filler. TIG, MIG and spot welding are key methods.
连接（焊接）：通过加热/加压，使用或不使用填充材料使材料（通常为金属）熔合。TIG、MIG 和点焊是主要方法。
8. Quality, Inspection & Metrology | 质量、检测与计量术语
Quality assurance ensures products meet specifications. Metrology terms define the science of measurement that underpins inspection.
质量保证确保产品符合规格。计量术语定义了支撑检测的测量科学。
Tolerance: The permissible limit of variation in a dimension, e.g., ±0.05 mm. Tighter tolerances increase manufacturing cost.
公差：尺寸允许的变动极限，例如 ±0.05 mm。更严格的公差会增加制造成本。
Calibration: Comparing an instrument’s reading against a known standard and adjusting to minimise error. Essential for traceability.
校准：将仪器读数与已知标准进行比较并调整以减小误差。对于可追溯性至关重要。
Six Sigma: A methodology aiming for 3.4 defects per million opportunities, using DMAIC (Define, Measure, Analyse, Improve, Control).
六西格玛：旨在实现每百万机会 3.4 个缺陷的方法论，使用 DMAIC（定义、测量、分析、改进、控制）流程。
Total Quality Management (TQM): An organisation-wide approach focusing on continuous improvement and customer satisfaction.
全面质量管理 (TQM)：全组织参与的方法，专注于持续改进和客户满意度。
9. Project Management & Economics | 项目管理与经济学术语
Engineers must manage time, cost and resources effectively. These terms bridge technical work and business decision-making.
工程师必须有效地管理时间、成本和资源。这些术语连接了技术工作与商业决策。
Gantt Chart: A horizontal bar chart showing tasks against a timeline. It displays start/end dates, durations and dependencies.
甘特图：以时间线为横轴显示任务的条形图。演示开始/结束日期、持续时间和依赖关系。
Critical Path Method (CPM): A network analysis technique identifying the longest sequence of dependent tasks that determines the project duration.
关键路径法 (CPM)：一种网络分析技术，确定决定项目工期的最长依赖任务序列。
Net Present Value (NPV): The sum of discounted future cash flows minus initial investment. Positive NPV indicates financial viability.
净现值 (NPV)：折现未来现金流之和减去初始投资。正 NPV 表明财务可行性。
Life Cycle Costing: Assessment of total cost of ownership, including purchase, operation, maintenance and disposal.
全生命周期成本：评估总拥有成本，包括采购、运行、维护和处置。
10. Engineering Design & CAD | 工程设计与 CAD 术语
The design process moves from concept to detailed specification. CAD terminology is central to modern product development.
设计过程从概念走向详细规格。CAD 术语是现代产品开发的核心。
Computer-Aided Design (CAD): Software used to create precise 2D and 3D models. Parametric CAD allows features to be driven by dimensions.
计算机辅助设计 (CAD)：用于创建精确二维和三维模型的软件。参数化 CAD 允许尺寸驱动特征。
Finite Element Analysis (FEA): A numerical method that subdivides a model into small elements to simulate stress, strain, heat transfer etc.
有限元分析 (FEA)：一种数值方法，将模型划分为小单元以模拟应力、应变、传热等。
Rapid Prototyping: Quick fabrication of a physical part using additive manufacturing, allowing early testing of form, fit and function.
快速原型制造：利用增材制造快速制作实物零件，允许对形状、配合和功能进行早期测试。
Bill of Materials (BOM): A structured list of all parts, sub-assemblies and materials required to manufacture a product.
物料清单 (BOM)：制造产品所需的所有零件、子组件和材料的结构化列表。
11. Health, Safety & Risk | 健康、安全与风险术语
Designing safe systems is a legal and ethical duty. These terms relate to hazard identification and risk mitigation in engineering environments.
设计安全系统是法律和道德责任。这些术语涉及工程环境中的危险识别和风险减轻。
Risk Assessment: A systematic process of evaluating the likelihood and severity of harm, leading to control measures.
风险评估：评估伤害可能性和严重程度的系统过程，从而制定控制措施。
Hierarchy of Control: A ranking of safety measures from most to least effective: elimination, substitution, engineering controls, administrative controls, PPE.
控制层级：安全措施从最有效到最无效的排序：消除、替代、工程控制、管理控制、个人防护装备。
Failure Mode and Effects Analysis (FMEA): A proactive tool for identifying potential failure modes and their impact on system performance.
失效模式与影响分析 (FMEA)：一种主动工具，用于识别潜在失效模式及其对系统性能的影响。
CE Marking: A conformity mark indicating a product meets EU health, safety and environmental requirements. Essential for market access.
CE 标志：表示产品符合欧盟健康、安全和环境要求的合格标志。对市场准入至关重要。
12. Renewable Energy & Sustainability | 可再生能源与可持续发展术语
Engineers play a key role in transitioning to low-carbon energy. Sustainability vocabulary is now embedded in specification and design.
工程师在向低碳能源转型中发挥关键作用。可持续发展词汇现已融入规范与设计。
Photovoltaic (PV) Cell: A semiconductor device that converts sunlight directly into electricity via the photovoltaic effect. Efficiency is typically 15-22%.
光伏电池：通过光电效应将阳光直接转化为电能的半导体器件。效率通常在 15-22% 之间。
Wind Turbine Power Coefficient (Cₚ): The fraction of kinetic wind energy converted into mechanical power. Betz limit states Cₚ max = 0.593.
风力发电机功率系数 (Cₚ)：风动能转化为机械功率的比例。贝茨极限指出 Cₚ 最大值为 0.593。
Embodied Energy: Total energy consumed during extraction, processing, manufacturing and delivery of a material or product.
隐含能量：材料或产品在开采、加工、制造和运输过程中消耗的总能量。
Cradle-to-Cradle Design: A biomimetic approach where materials are designed to be fully reused or recycled, eliminating waste.
摇篮到摇篮设计：一种仿生方法，设计材料可完全再利用或回收，从而消除废弃物。
Circular Economy: An economic system aimed at minimising waste and making the most of resources through reuse, repair, refurbishment and recycling.
循环经济：旨在通过再利用、维修、翻新和回收，最大限度减少浪费并充分利用资源的经济体系。
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