📚 Year 9 AQA Engineering: Core Knowledge Review | Year 9 AQA 工程：核心知识点梳理
Engineering in Year 9 introduces you to the exciting world of how things are designed, made and improved. This article brings together the core knowledge you need for the AQA specification, covering everything from the design process and material selection to manufacturing methods, electronics and sustainability. A clear understanding of these fundamentals will help you tackle both written exams and practical project work with confidence.
九年级的工程课将带你走进一个激动人心的世界——了解产品是如何被设计、制造和不断改进的。本文梳理了AQA考试大纲所要求的核心知识点，涵盖从设计流程、材料选择到制造工艺、电子学和可持续发展的全部内容。对这些基础知识形成清晰的理解，将帮助你在笔试和实践项目中都充满信心地应对挑战。
1. The Engineering Design Process | 工程设计流程
Every successful engineering project follows a structured iterative cycle. The first step is identifying the problem or need, often set out in a design brief, where you must understand exactly what the user requires.
每个成功的工程项目都遵循一个结构化的迭代循环。第一步是确定问题或需求，通常会在设计任务书中给出，你必须准确理解用户到底需要什么。
You then conduct research to gather information about existing products, materials, technologies and the target market. This research feeds into the generation of a range of initial ideas, using techniques like sketching, brainstorming and mood boards.
接着进行研究，收集有关现有产品、材料、技术和目标市场的信息。这些研究成果会用于产生一系列初步构想，采用的方法包括草图绘制、头脑风暴和情绪板。
From these ideas, you select a preferred solution using criteria such as feasibility, cost, aesthetics and function. You then develop a detailed design with dimensions, materials and components, before building a prototype to test your concept.
从这些构想中，根据可行性、成本、美观性和功能等标准选择一个最佳方案。然后进行详细设计，确定尺寸、材料和零件，再制作原型来检验你的概念。
Evaluation against the original specification is crucial. If problems are found, you return to earlier stages to refine and improve the design. This continuous loop of ‘design – make – evaluate’ is the heart of engineering.
根据最初的规格要求进行评价至关重要。如果发现问题，就要回到前面的阶段进行修改和改进。这种“设计—制作—评估”的持续循环正是工程学的核心。
2. Materials and Their Properties | 材料及其性能
Engineers choose materials based on their working properties. Metals like mild steel and aluminium are strong, ductile and conductive; plastics such as acrylic (thermoplastic) and epoxy resin (thermoset) offer lightweight and mouldability.
工程师根据材料的工作性能来选择材料。低碳钢和铝等金属强度高、延展性好且具有导电性；亚克力（热塑性塑料）和环氧树脂（热固性塑料）等塑料则具有轻质和可模塑的优点。
Timber is split into hardwoods (oak, beech), softwoods (pine, cedar) and manufactured boards (plywood, MDF). Each type has distinct grain, strength and workability, influencing its use in furniture, structures and interior applications.
木材分为硬木（橡木、山毛榉）、软木（松木、雪松）和人造板（胶合板、中密度纤维板）。每一种都有独特的纹理、强度和加工性，影响着它们在家具、结构和室内中的应用。
Composites like fibreglass and carbon fibre combine materials to achieve properties not possible with a single substance. The table below summarises key mechanical properties you must know.
像玻璃纤维和碳纤维这样的复合材料将不同材料组合起来，达到单一材料无法实现的性能。下表总结了你必须了解的关键力学性能。
| Property (English) | 性能 (中文) | Meaning |
|---|---|---|
| Strength | 强度 | Ability to withstand force without breaking |
| Hardness | 硬度 | Resistance to scratching or indentation |
| Toughness | 韧性 | Ability to absorb energy without fracturing |
| Ductility | 延展性 | Can be drawn into wires |
| Malleability | 可锻性 | Can be hammered into thin sheets |
| Conductivity (electrical/thermal) | 导电性/导热性 | Ability to transfer electricity or heat |
3. Manufacturing Processes | 制造工艺
Subtractive processes remove material to create a shape. Common school workshop methods include sawing (e.g. tenon saw), drilling with a pillar drill, and filing to achieve accurate edges and finishes.
减材制造通过去除材料来成形。学校车间常见的方法包括锯切（比如手板锯）、用台钻钻孔以及用锉刀修整出精确的边缘和表面光洁度。
Forming processes reshape material without removing it. Bending sheet metal using a folding machine, vacuum forming thermoplastics over a mould, and casting molten metal or resin into a mould cavity are typical examples.
成形工艺在不移除材料的情况下改变其形状。用弯板机弯曲金属板、将热塑性塑料在模具上真空吸塑、把熔融金属或树脂浇铸到模具型腔中都是典型例子。
Joining can be permanent, like welding metals, soldering electronic joints and using adhesives, or semi-permanent with bolts, nuts and screws. The choice depends on required strength, disassembly needs and the materials being joined.
连接可以是永久性的，如焊接金属、焊接电子接头和使用胶粘剂，也可以是半永久性的，用螺栓、螺母和螺钉。选择哪种方法取决于所需强度、是否需要拆卸以及被连接的材料。
Modern additive manufacturing (3D printing) builds up parts layer by layer from PLA, ABS or resin. It allows complex geometries, rapid prototyping and minimal waste, and is often used alongside CAD.
现代增材制造（3D打印）用PLA、ABS或树脂逐层构建零件。它可以实现复杂的几何形状、快速成型，而且废料极少，通常与CAD配合使用。
4. Health and Safety in Engineering | 工程中的健康与安全
Personal Protective Equipment (PPE) is the first line of defence. Safety goggles protect eyes from flying chips, ear defenders reduce noise damage, and steel-capped boots guard against heavy falling objects.
个人防护装备（PPE）是第一道防线。护目镜保护眼睛免受飞溅碎屑伤害，耳罩降低噪声损伤，钢头安全鞋防止重物坠落砸伤。
Before starting any activity, you must carry out a risk assessment: identify hazards (sharp blades, hot surfaces), evaluate the risk and implement control measures such as guards, extraction systems and safe operating procedures.
开始任何操作前，必须进行风险评估：识别危险源（锋利刀刃、炽热表面），评定风险等级，并实施控制措施，如防护罩、抽风系统和安全操作规程。
Workshop safety signs use standard colours and shapes. Red circles with a diagonal line mean ‘prohibition’, yellow triangles indicate ‘warning’, blue circles show ‘mandatory action’, and green rectangles signal ‘safe condition’ or first aid.
车间安全标志采用标准颜色和形状。红圈加斜杠表示“禁止”，黄色三角形表示“警告”，蓝色圆形表示“必须执行的动作”，绿色矩形表示“安全状况”或急救设施。
Emergency procedures, including stop buttons, fire exits and first aid kits, must be known by everyone. Never use a machine unless you have been properly trained and your work area is clean and tidy.
每个人都必须了解紧急程序，包括急停按钮、消防出口和急救箱的位置。未经适当培训且工作区域未清理整洁之前，绝不可操作机器。
5. Mechanical Systems | 机械系统
Mechanisms change the magnitude or direction of a force. Levers use a pivot (fulcrum) to lift heavy loads with less effort. The mechanical advantage is the ratio of load to effort.
机构用于改变力的大小或方向。杠杆利用支点以较小的力抬起重物。机械利益就是负载与施力之比。
Linkages transfer motion between different points. Simple linkages include reverse-motion and parallel-motion types, often used in pop-up cards, grabbers and robotic arms.
连杆机构将运动从一个点传递到另一点。简单的连杆机构包括反向运动和平行运动类型，常用于立体卡片、抓取器和机械臂中。
Gears and pulleys transmit rotary motion. A gear train can increase or decrease speed and torque: if a small driver gear turns a larger driven gear, speed decreases but torque increases. The velocity ratio is calculated from the number of teeth.
齿轮和带轮传递旋转运动。齿轮系可以增减速和改变扭矩：如果小主动轮带动大从动轮，则速度减小但扭矩增大。速度比根据齿数计算得出。
Velocity ratio = Number of teeth on driven gear / Number of teeth on driver gear
For belt and pulley systems, the ratio depends on pulley diameters. Newton’s laws of motion underpin all mechanical analysis: an object will remain at rest or in uniform motion unless acted upon by a resultant force (F = m × a).
对于带传动系统，速度比取决于带轮直径。牛顿运动定律是所有力学分析的基础：物体将保持静止或匀速直线运动状态，除非受到合外力的作用（F = m × a）。
6. Electronic Systems and Circuits | 电子系统与电路
An electronic system follows an input-process-output model. Input sensors such as LDRs (light-dependent resistors) and thermistors detect changes in the environment and convert them into electrical signals.
电子系统遵循输入-处理-输出模型。输入传感器如光敏电阻（LDR）和热敏电阻探测环境变化，并将其转化为电信号。
The process block often contains a microcontroller (e.g. PICAXE or Arduino) or a comparator circuit. The output could be an LED, buzzer, motor or relay to control a larger load.
处理模块通常包含微控制器（如PICAXE或Arduino）或比较器电路。输出可以是LED、蜂鸣器、电机或继电器，用来控制更大的负载。
Ohm’s law is a fundamental relationship in all electrical circuits. It links voltage, current and resistance.
欧姆定律是所有电路中的基本关系，它将电压、电流和电阻联系在一起。
V = I × R
You must be able to calculate any one quantity given the other two. For example, if a 9V battery powers a circuit with a 300 Ω resistor, the current flowing is I = 9/300 = 0.03 A (30 mA).
你必须能够根据已知的两个量计算出第三个量。例如，如果一个9V电池为一个300Ω电阻的电路供电，那么流过的电流为I = 9/300 = 0.03 A（30 mA）。
Power dissipation in a component is given by P = V × I. Selecting the correct resistor power rating prevents overheating. Simple series and parallel circuits are also tested; in parallel, the voltage across each branch is equal.
元件消耗的功率由P = V × I给出。选择正确的电阻额定功率可防止过热。简单的串联和并联电路也在考查范围内；在并联电路中，各支路两端的电压相等。
7. Computer-Aided Design (CAD) | 计算机辅助设计
CAD software allows engineers to create precise 2D drawings and 3D models. Programs like SolidWorks, Fusion 360 and 2D Design Tools are commonly used in schools for generating orthographic views, isometric projections and assembly models.
CAD软件让工程师能够创建精确的二维工程图和三维模型。SolidWorks、Fusion 360和2D Design等工具常用于学校中生成正视图、等轴测图以及装配模型。
Key advantages of CAD include the ability to modify dimensions easily, test fit and movement through virtual assembly, and perform simulations such as stress analysis. It dramatically reduces physical prototyping time.
CAD的主要优势包括可以轻松修改尺寸、通过虚拟装配检验配合与运动，并执行应力分析等仿真。这大大缩短了物理原型制作的时间。
Components can be saved as standard parts and reused across projects. Outputs from CAD, such as STL files for 3D printing or DXF files for laser cutting, provide a direct link to CAM.
零件可以保存为标准件并在不同项目中重复使用。CAD输出的STL文件（用于3D打印）或DXF文件（用于激光切割）可直接连接CAM。
Annotation of drawings with dimensions, tolerances and material notes is an important skill. Always include a title block with your name, date, scale and projection symbol.
在图纸上标注尺寸、公差和材料说明是一项重要技能。始终要添加包含你的名字、日期、比例和投影符号的标题栏。
8. Computer-Aided Manufacturing (CAM) | 计算机辅助制造
CAM takes the digital design from CAD and uses it to control machine tools. Common CAM machines in schools include the laser cutter, CNC router, 3D printer and vinyl cutter.
CAM获取CAD中的数字化设计，并用以控制机床。学校中常见的CAM设备包括激光切割机、数控雕刻机、3D打印机和刻字机。
The machine follows a program, often written in G-code, which specifies coordinates, speeds and tool paths. When you set up a laser cut on plywood, the CAM software generates the path and controls the laser power and speed.
机器依照通常用G代码编写的程序运行，其中指定了坐标、速度和刀具路径。当你在胶合板上设置激光切割时，CAM软件生成路径并控制激光功率和速度。
Benefits of CAM include high repeatability, complex detail that would be difficult by hand, and fast production. However, there is an initial setup cost and machines need regular maintenance.
CAM的益处包括高重复精度、手工难以完成的复杂细节以及快速生产。然而，会有初始设置成本，机器也需要定期维护。
Integration of CAD/CAM enables a seamless ‘design to part’ workflow. A student can model a phone stand in CAD in the morning, generate the CAM toolpath, and have a finished physical part by the end of the lesson.
CAD/CAM的集成实现了“从设计到零件”的无缝工作流程。学生上午可以在CAD中建模一个手机支架，生成CAM刀具路径，下课前就能拿到做好的实物零件。
9. Sustainability and Environmental Impact | 可持续性与环境影响
Engineers must consider the environmental footprint of a product throughout its life. The 6Rs provide a framework: Reduce, Reuse, Recycle, Rethink, Refuse and Repair. Each helps to minimise waste and energy use.
工程师必须考虑产品在整个生命周期中的环境足迹。6R原则提供了一个框架：减少、重复使用、回收、重新思考、拒绝和修复。每一条都有助于减少浪费和能源消耗。
Choosing materials with low embodied energy is part of sustainable design. For example, aluminium from recycled cans uses 95% less energy than primary production. Specifying local materials cuts transport emissions.
选择内含能量低的材料是可持续设计的一部分。例如，用回收易拉罐生产的铝比原生铝节省95%的能源。采用本地材料可以减少运输排放。
Life Cycle Assessment (LCA) examines raw material extraction, manufacture, distribution, use and disposal. Products designed for disassembly make it easier to replace parts and recycle materials at end of life.
生命周期评估（LCA）审视原材料提取、制造、分销、使用和废弃处理的整个过程。可拆卸设计使得产品在报废时更容易更换零件和回收材料。
In your project work, aim to use materials efficiently (nesting parts on a sheet) and choose finishes that are non-toxic and durable. Designing for longevity reduces the need for frequent replacements.
在你的项目工作中，应追求材料的高效利用（如在板上排样）并选择无毒耐久的表面处理。设计长寿命产品可以减少频繁更换的需要。
10. Testing and Evaluation | 测试与评估
Testing proves whether a product meets its specification. For a structural model, you might test load capacity. For an electronic circuit, you would check functionality with a multimeter and observe output conditions.
测试能证明产品是否符合其规格。对于结构模型，你可以测试承载能力。对于电子电路，你会用万用表检查功能并观察输出状态。
User testing gathers feedback on ergonomics, ease of use and aesthetics. A questionnaire or user trial can reveal issues you had not anticipated, such as sharp edges or confusing button layout.
用户测试可以收集有关人机工学、易用性和美观性的反馈。问卷或用户试用可能会揭示你未曾预料的问题，如锐利的边缘或令人困惑的按钮布局。
Evaluation is an ongoing process that compares outcomes against the original design brief. It is essential to record test data systematically, using tables and graphs, and to suggest specific improvements based on evidence.
评估是一个持续的过程，将成果与最初的设计任务书要求进行比较。关键是要用表格和图表系统地记录测试数据，并基于证据提出具体的改进建议。
Iterative testing leads to a better solution. Even if a prototype fails, the process provides valuable learning. In your final report, clearly document what you changed and why, linking back to your test results.
迭代测试会带来更优的解决方案。即便原型失败了，这个过程也提供了宝贵的学习。在最终报告中，清楚地记录你修改了什么以及为什么修改，并回头关联你的测试结果。
Published by TutorHao | AQA Engineering Revision Series | aleveler.com
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