📚 IGCSE WJEC Engineering: International Competition Preparation Guide | IGCSE WJEC 工程：国际竞赛备战攻略
Preparing for an international engineering competition while studying IGCSE WJEC Engineering requires more than remembering formulas. It demands design thinking, practical workshop skills, data analysis and confident communication. This guide brings together the WJEC assessment style and the demands of popular competitions such as F1 in Schools, VEX Robotics and the Land Rover 4×4 in Schools challenge.
在学习 IGCSE WJEC 工程的同时备战国际工程竞赛，不仅需要记住公式，还需要设计思维、车间动手能力、数据分析以及自信的表达交流。本攻略将 WJEC 的考核方式与 F1 in Schools、VEX Robotics、Land Rover 4×4 in Schools 等热门竞赛的要求结合起来，给你一套可执行的准备方法。
1. Understanding the WJEC Engineering Specification | 了解 WJEC 工程课程大纲
WJEC Engineering qualifications are built around the design-manufacture-evaluate cycle. You will be expected to analyse a brief, generate concepts, select materials, produce drawings, justify manufacturing choices and test a final outcome. Competition success uses the same cycle, so treat your competition entry as an extension of coursework rather than a separate task.
WJEC 工程课程围绕设计、制造、评估的循环展开。你需要分析任务书、生成概念、选择材料、绘制图纸、论证制造方案并测试最终成果。竞赛成功也依赖同样的流程，因此要把竞赛作品当作课程作业的延伸，而不是独立任务。
Check which assessment units your centre offers: many students complete a practical making task and a written paper covering materials, mechanisms, electronics and calculations. Map each competition requirement to a WJEC topic. For example, a F1 in Schools car needs aerodynamics, CAD/CAM, material choice and data analysis, all of which are WJEC areas.
先确认你所在学校开设哪些考核单元：很多学生需要完成一项制作任务和一份笔试，内容涵盖材料、机构、电子与计算。把每项竞赛要求对应到 WJEC 主题。例如，F1 in Schools 赛车需要空气动力学、CAD/CAM、材料选择和数据分析，这些都属于 WJEC 的内容。
- Design brief – competition rules | 设计任务书 – 竞赛规则
- Engineering drawings – CAD portfolio | 工程图纸 – CAD 作品集
- Testing and data – performance logs | 测试与数据 – 性能记录
- Evaluation – presentation and judging | 评估 – 展示与答辩
2. Target Competitions and Their Requirements | 目标竞赛及其要求
Choose a competition early and read the rules as a design specification. F1 in Schools focuses on a compressed-air or CO2-powered model car, requiring aerodynamics, CNC manufacturing, branding and verbal presentation. VEX Robotics prioritises mechanism design, control programming, autonomous routines and an engineering notebook. Land Rover 4×4 in Schools asks teams to design and manufacture a remote-controlled four-wheel-drive vehicle, with strict dimensions, weight and electronics rules.
尽早选择竞赛，并把规则当作设计规格书来阅读。F1 in Schools 以压缩空气或 CO2 驱动的模型赛车为核心，要求空气动力学、数控加工、品牌设计和口头展示。VEX Robotics 侧重机构设计、控制编程、自动程序和工程笔记。Land Rover 4×4 in Schools 则要求团队设计并制造遥控四驱车辆，并且对尺寸、重量和电子系统有严格规定。
Create a requirements table including rule, measurable target, WJEC topic, evidence needed and deadline. This turns an abstract competition into manageable coursework-style tasks.
制作一张需求表，包含规则、可测量目标、对应的 WJEC 主题、所需证据和截止日期。这样能把抽象的竞赛转化为可管理的课程式任务。
| Competition | 竞赛 | Main output | 主要成果 | Key WJEC links | 主要 WJEC 联系 | Evidence | 证据 |
| F1 in Schools | Miniature racing car | 微型赛车 | Aerodynamics, CAD/CAM, materials | 空气动力学、CAD/CAM、材料 | Design portfolio, test data | 设计作品集、测试数据 |
| VEX Robotics | Competition robot | 竞赛机器人 | Mechanisms, electronics, programming | 机构、电子、编程 | Engineering notebook, code | 工程笔记、代码 |
| Land Rover 4×4 in Schools | RC 4×4 vehicle | 遥控四驱车 | Mechanisms, structures, electronics | 机构、结构、电子 | CAD drawings, manufacturing diary | CAD 图纸、制造日志 |
3. Building Core Engineering Knowledge | 夯实核心工程知识
Before designing anything, you need secure knowledge of forces, moments, energy, electricity and materials. Competition judges and examiners reward precise vocabulary and correct units. For mechanisms, remember the mechanical advantage formula:
在设计任何东西之前，你需要扎实掌握力、力矩、能量、电学和材料知识。竞赛裁判和考官都喜欢准确的专业术语和单位。对于机构，记住机械利益公式：
MA = Load ÷ Effort
Velocity ratio compares distances moved by effort and load, and efficiency links the two ideas:
速度比比较动力和负载移动的距离，而效率把两者联系起来：
Efficiency = (MA ÷ VR) × 100%
In electronics, Ohm’s law and the power relation are essential for motor and sensor circuits:
在电子学中，欧姆定律和功率关系对电机和传感器电路至关重要：
V = I × R and P = V × I
If your robot or vehicle uses a motor driver, calculate current demand before choosing a battery or fuse.
如果你的机器人或车辆使用电机驱动器，在选择电池或保险丝之前要先计算电流需求。
4. Mastering Engineering Drawing and CAD | 掌握工程制图与 CAD
Competition portfolios are judged on the quality of design communication. You should be able to produce dimensioned orthographic drawings, isometric sketches and exploded views. Follow British standards: use millimetres, include hidden detail as dashed lines, and place dimensions outside the object where possible.
竞赛作品集会根据设计表达质量评分。你应能绘制带尺寸的正投影图、等轴测草图和爆炸图。遵循英国标准：使用毫米单位，虚线表示隐藏细节，尺寸尽量标注在物体外部。
Spend time in CAD before manufacturing. Parametric modelling in Fusion 360, SolidWorks or Onshape allows you to test fits, estimate mass and generate CNC toolpaths. A common WJEC task is to modify a CAD file or produce a drawing from a given part; competition CAD models should show the same rigor.
制造前要花时间做 CAD。在 Fusion 360、SolidWorks 或 Onshape 中进行参数化建模，可以测试装配、估算质量并生成数控加工路径。WJEC 常见任务是修改 CAD 文件或根据零件出图，竞赛 CAD 模型也应同样严谨。
- Fully defined sketches | 完全约束的草图
- Material assigned | 已指定材料
- Correct units | 单位正确
- Interference checks | 干涉检查
- Rendered presentation views | 渲染展示视图
5. Materials, Mechanisms and Electronics | 材料、机构与电子基础
Select materials by linking properties to function. For a lightweight car body, choose a rigid, low-density polymer or balsa composite; for axles, use hardened steel; for robot chassis, aluminium or polycarbonate. Be ready to justify contrasting metals, polymers, woods and smart materials.
选择材料时要联系性能与功能。轻量化车身可选择刚性好的低密度聚合物或轻木复合材料；车轴使用硬化钢；机器人底盘可用铝或聚碳酸酯。要能论证不同金属、聚合物、木材和智能材料的差异。
Mechanisms often appear in competition challenges: levers, linkages, cams, gears, pulleys and worm drives. Calculate velocity ratio and torque:
竞赛题目中经常出现机构：杠杆、连杆、凸轮、齿轮、带轮和蜗杆传动。计算速度比和扭矩：
Torque = Force × perpendicular distance from pivot
For gears, if a 20-tooth driver turns a 60-tooth driven gear, VR = 3, meaning output speed is one third of input speed but torque is three times greater, ignoring friction.
对于齿轮，如果 20 齿主动轮带动 60 齿从动轮，速度比 VR = 3，表示输出转速为输入转速的三分之一，但扭矩增大三倍，忽略摩擦。
Electronic sensing and control require input-process-output thinking. A line-following robot may use infrared sensors, a microcontroller and motor drivers. For safety and reliability, include reverse-polarity protection, current-limiting resistors and mechanical stops.
电子传感与控制需要输入、处理、输出的思维。循迹机器人可能使用红外传感器、微控制器和电机驱动。为安全可靠，应加入反接保护、限流电阻和机械止位。
6. Practical Workshop Skills and Safety | 实践车间技能与安全
Competition builds are judged not only on performance but also on accuracy, finish and safe working. Practise marking out, cutting, drilling, filing, soldering and assembly. Use jigs and stops to reproduce accurate holes and joints. Keep a manufacturing log with photographs, changes and safety checks.
竞赛作品不仅看性能，还看精度、表面质量与安全操作。练习划线、切割、钻孔、锉削、焊接和装配。使用夹具和限位块来保证孔位和接头的重复精度。用照片、变更记录和安全检查记录制作制造日志。
Health and safety is a WJEC assessment focus and a competition expectation. Wear eye protection, tie back hair, use fume extraction when soldering, and follow machine-specific rules such as blade guards and dust extraction.
健康与安全是 WJEC 的评估重点，也是竞赛的基本要求。佩戴护目镜、扎起头发、焊接时使用排烟装置，并遵守相关机器的规则，如防护罩和吸尘装置。
7. Design Process and Portfolio Development | 设计流程与作品集开发
Use an iterative design cycle: research, specification, concept sketches, modelling, testing, evaluation and redesign. Do not wait for a perfect first idea. Judges value evidence of refinement, especially when changes are driven by test data.
使用迭代设计循环：调研、规格、概念草图、建模、测试、评估和再设计。不要等待完美的第一个想法。裁判尤其看重改进的证据，尤其是依据测试数据做出的修改。
Your portfolio should tell a story. Start with the brief and a numbered specification, then show at least three distinct concepts. Use decision matrices to select the best idea, and justify choices with numbers, not adjectives. Include photographs of models, CAD screenshots, force calculations and test results.
作品集要讲一个完整故事。从任务书和编号规格开始，展示至少三个不同概念。用决策矩阵选择最佳方案，并用数据而不是形容词来论证选择。包括模型照片、CAD 截图、受力计算和测试结果。
| Portfolio section | 作品集部分 | Evidence | 证据 | WJEC link | WJEC 联系 |
| Brief analysis | 任务分析 | Annotated rules, client needs | 标注规则、客户需求 | Design task | 设计任务 |
| Specification | 规格 | Measurable targets | 可测量目标 | Design criteria | 设计标准 |
| Concept generation | 概念生成 | Sketches, modelling | 草图、建模 | Design ideas | 设计想法 |
| Development | 开发 | CAD iterations, calculations | CAD 迭代、计算 | 更多咨询请联系16621398022（同微信）
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