📚 Year 10 Eduqas Engineering: Case Study Practical Exercises | Year 10 Eduqas 工程：案例分析实战演练
In the Eduqas GCSE Engineering course, the case study is a central assessment tool that tests your ability to apply theory to real-world design and manufacturing problems. This article provides a structured, hands-on walk through effective case study analysis, from reading the brief to presenting a fully reasoned engineering solution. By working through practical examples, you will learn how to identify key requirements, select materials, justify processes, and communicate your ideas with precision.
在 Eduqas 的 GCSE 工程课程中，案例分析是一种核心的评估方式，用来考查你将理论应用于实际设计与制造问题的能力。本文带你进行一次结构化、实操式的案例分析演练——从解读任务要求，到呈现完整的、有说服力的工程方案。通过实际例子，你将学会识别关键需求、选择材料、论证工艺，以及精确地表达自己的想法。
1. Understanding the Case Study Brief | 理解案例分析要求
The first task in any engineering case study is to deconstruct the brief. You must extract the core problem, identify the user group, and highlight constraints such as budget, size, and manufacturing volume. Look for command words like ‘design’, ‘evaluate’, or ‘justify’, because they determine the depth of response required.
任何工程案例分析的第一步，都是解构任务要求。你需要提取核心问题，识别用户群体，并标出预算、尺寸、制造批量等约束条件。注意题目中的指令词，比如“设计”、“评估”或“论证”，因为它们决定了你答案的深度。
It is helpful to underline or list key terms: ‘lightweight’, ‘weatherproof’, ‘accessible for ages 11–16’, or ‘mass production’. These words will later form your design specification. Always consider the context—is the product for indoor use, outdoor sports, or medical equipment? Context drives engineering decisions.
划出或列出关键词会很有帮助：“轻量化”、“防风雨”、“适用于11–16岁”、“大规模生产”。这些词语随后会构成你的设计规格。要始终考虑使用场景——产品是用于室内、户外运动还是医疗设备？场景驱动着工程决策。
2. Identifying Stakeholder Needs & Design Criteria | 确定利益相关者需求与设计标准
Stakeholders extend beyond the end user. They include manufacturers, retailers, maintenance teams, and even regulatory bodies. Each stakeholder group imposes requirements: the user wants comfort and safety, the manufacturer wants low assembly cost, and the environment demands reduced waste.
利益相关者不仅仅指最终用户，还包括制造商、零售商、维护团队甚至监管机构。每一个利益相关方都会提出需求：用户想要舒适与安全，制造商追求低装配成本，而环境要求减少废弃。
Convert these needs into measurable design criteria. For a bicycle phone holder, criteria could be: mass ≤ 150 g, withstands 10 g impact force, waterproof to IPX4, and production cost below £3 per unit. A clear table of criteria with target values and prioritisation helps you stay focused in later stages.
把这些需求转化为可测量的设计标准。对于一个自行车手机支架，标准可以是：质量 ≤ 150 g，承受 10 g 冲击力，防水等级 IPX4，单件生产成本低于 3 英镑。制作一个清晰的标准表格，列出目标值和优先级，能帮助你在后续阶段保持专注。
| Criterion | Target value | Priority |
|---|---|---|
| Mass | ≤150 g | Must |
| Impact resistance | Survive 10 g shock | Must |
| Water protection | IPX4 | Should |
| Unit cost | <£3 | Must |
3. Research and Existing Product Analysis | 调研与现有产品分析
Solid research underpins a convincing case study. Use both primary sources (observations, surveys) and secondary sources (manufacturer datasheets, textbooks). Examine existing products that solve a similar problem and perform a structured analysis such as ACCESS FM—Aesthetics, Cost, Customer, Environment, Size, Safety, Function, Materials.
扎实的研究是令人信服的案例分析的基础。需要同时使用一手资料（观察、问卷调查）和二手资料（制造商数据表、教科书）。考察解决类似问题的现有产品，并用 ACCESS FM 等结构化的方法进行分析——美学、成本、用户、环境、尺寸、安全、功能、材料。
When analysing a competitor’s product, note what works well and what fails. For a phone holder, perhaps it grips well but blocks the camera. Record observations against each ACCESS FM heading. This directly informs your own design ideas and prevents you from repeating market failures.
分析竞品时，要记下哪些地方做得好、哪些地方失败了。对于一个手机支架，可能夹持力不错但遮挡了摄像头。对照 ACCESS FM 的每一项记录观察结果。这能直接启发你自己的设计思路，并避免重蹈市场上的失败案例。
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Aesthetics: Does the shape appeal to the target age group?
美学：造型是否吸引目标年龄段？
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Customer: Is it easy to install and remove?
用户：是否容易安装和拆卸？
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Safety: Are there sharp edges or pinch points?
安全：有无锐边或夹伤点？
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Materials: Are they recyclable and weather-resistant?
材料：是否可回收且耐候？
4. Material Selection for Engineering Applications | 工程应用中的材料选择
Choosing the right material is one of the most examined skills in Eduqas Engineering. You must consider mechanical properties (strength, stiffness, toughness), physical properties (density, thermal conductivity), and processing characteristics. Common GCSE materials include low‑carbon steel, aluminium alloy, ABS, polypropylene, and plywood.
选择合适的材料是 Eduqas 工程中最常考查的技能之一。你必须考虑力学性能（强度、刚度、韧性）、物理性能（密度、导热性）以及加工特性。GCSE 阶段常见的材料包括低碳钢、铝合金、ABS、聚丙烯和胶合板。
For a product like a phone holder that is subject to vibration, you need good fatigue resistance and low density. Engineering calculations may involve simple stress estimates. The direct stress formula is often useful:
对于像手机支架这样承受振动的产品，需要良好的抗疲劳性能和低密度。工程计算可能涉及简单的应力估算。正应力公式经常用到：
σ = F / A
Where σ is stress in N/m² or Pa, F is the force in N, and A is the cross‑sectional area in m². Even a rough calculation shows whether a chosen material is likely to yield.
其中 σ 为应力，单位 N/m² 或 Pa，F 为力 (N)，A 为横截面积 (m²)。即使粗略计算，也能显示所选材料是否可能屈服。
| Material | Density (kg/m³) | Tensile strength (MPa) | Cost |
|---|---|---|---|
| ABS | 1050 | 40 | Low |
| Aluminium alloy | 2700 | 310 | Medium |
| Polypropylene | 900 | 30 | Very low |
5. Manufacturing Processes & Production Planning | 制造工艺与生产规划
The scale of production fundamentally determines the manufacturing method. For one‑off prototypes, 3D printing (FDM) is ideal because tooling cost is negligible. For medium‑volume batches, injection moulding becomes economical despite the high initial mould cost, because the per‑part price drops sharply.
生产规模从根本上决定了制造方法。对于一次性原型，3D 打印（FDM）是理想选择，因为模具成本可以忽略。对于中批量生产，尽管开模费用高，注塑成型会变得经济，因为单件成本急剧下降。
You must also sequence operations: cutting, forming, joining, and finishing. Create a production plan that lists each step, the machine or tool required, and quality checks. If electronics are involved, include PCB assembly and soldering stages. Think about jigs and fixtures to speed up production.
你还需要安排工序顺序：下料、成形、连接和表面处理。制作一份生产计划，列出每一个步骤、所需的机器或工具，以及质量检验点。如果涉及电子部分，要包含 PCB 装配和焊接阶段。考虑使用夹具和工装来加快生产。
Example flow for a batch of 500 phone holders:
500 件手机支架的流程示例：
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Cut ABS sheets to size – band saw – check dimensions.
将 ABS 板材裁切至尺寸 – 带锯 – 检查尺寸。
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Injection mould main body – 2‑cavity mould – visual inspection.
注塑主体 – 双腔模具 – 外观检查。
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Insert threaded brass inserts – heat‑stake process – pull‑out test.
嵌入螺纹铜套 – 热熔工艺 – 拉拔测试。
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Assemble clamp and silicone pads – manual – functional test.
组装夹具与硅胶垫 – 手动 – 功能测试。
6. Mechanical Systems and Electronics Integration | 机械系统与电子集成
Modern engineered products often combine mechanical assemblies with simple electronic circuits. In an Eduqas case study, you may need to describe a linkage mechanism for a clamp or a sensor circuit that triggers an LED. Understand basic mechanisms: levers, gears, cams, and linkages.
现代工程产品常常将机械组件与简单电子电路相结合。在 Eduqas 的案例分析中，你可能需要描述夹具的连杆机构，或是触发 LED 的传感器电路。要理解基础机构：杠杆、齿轮、凸轮和连杆。
For a smart phone holder, a vibration sensor (piezoelectric or accelerometer) could detect rough terrain and warn the cyclist with a small LED. You can draw a system diagram with Input → Process → Output. Use block diagrams rather than detailed circuit schematics unless the question demands it.
对于一个智能手机支架，振动传感器（压电式或加速度计）可检测到颠簸路况，并通过小型 LED 提醒骑行者。你可以画出输入 → 处理 → 输出的系统框图。除非题目明确要求，否则使用框图而不是详细的电路原理图。
Consider power supply: a coin cell battery or rechargeable lithium‑ion cell. Calculate approximate current consumption to justify battery life. Ohm’s law helps size the current‑limiting resistor for an LED:
考虑电源：纽扣电池或可充电锂离子电池。估算电流消耗，以论证电池寿命。欧姆定律有助于确定 LED 限流电阻的大小：
R = (Vsupply – VLED) / ILED
Always include a fuse or PTC for safety, and state how the system is earthed if in a metal enclosure.
始终要加入保险丝或 PTC 以保证安全，并说明如果使用金属外壳，系统如何接地。
7. Testing, Evaluation and Quality Assurance | 测试、评估与质量保证
A strong case study includes a clear testing plan to validate each design criterion. Specify destructive and non‑destructive tests. For the phone holder, non‑destructive dimensional checks with a vernier caliper ensure tolerances of ±0.5 mm. Destructive drop tests from 1.2 m validate impact resistance.
一份优秀的案例分析会包含清晰的测试计划，以验证每一项设计标准。需要明确破坏性和非破坏性测试。对于手机支架，用游标卡尺进行非破坏性尺寸检验，保证 ±0.5 mm 的公差。从 1.2 m 高度进行破坏性跌落测试以验证抗冲击性。
Quality assurance (QA) is about the system; quality control (QC) is about the product. In a production line, you might use a go/no‑go gauge to check critical dimensions, and statistical process control to monitor injection moulding pressure. Record results in a table and compare against the original specification.
质量保证 (QA) 关注的是体系，质量控制 (QC) 关注的是产品。在生产线上，你可以用通止规检查关键尺寸，并用统计过程控制监控注塑压力。将结果记录在表格中，并与原始规格进行比较。
If a test fails, describe corrective actions: adjust mould temperature, change material grade, or redesign the snap‑fit geometry. Show iterative refinement, because engineering is rarely right first time.
如果测试失败，描述纠正措施：调整模具温度、更换材料牌号，或重新设计卡扣几何形状。要展现迭代优化的过程，因为工程中很少一次就做对。
8. Sustainability and Environmental Considerations | 可持续性与环境考量
Sustainability is a key part of the Engineering specification. Apply the 6Rs: Reduce, Reuse, Recycle, Rethink, Refuse, Repair. A product designed with snap‑fits instead of adhesives allows easy disassembly for recycling. Choosing a single polymer type avoids contamination of recycling streams.
可持续性是工程教学大纲的重要内容。运用 6R 原则：减少、重用、回收、再思考、拒绝、修复。用卡扣代替粘合剂设计的产品，可以方便拆卸回收。选择单一聚合物类型可避免污染回收流。
Conduct a simplified life‑cycle analysis (LCA): raw material extraction, manufacturing, transport, use, and end‑of‑life. For ABS, highlight that it is derived from crude oil but can be mechanically recycled. Compare this with a bioplastic like PLA, which is compostable under industrial conditions but has lower impact strength.
进行简化的生命周期分析 (LCA)：原材料获取、制造、运输、使用和报废处理。对于 ABS，要强调它来自原油但可以机械回收；与 PLA 这样的生物塑料比较，PLA 在工业条件下可堆肥但冲击强度较低。
Also consider carbon footprint: transport distance, energy source for injection moulding, and packaging. Propose using recycled cardboard for packaging and minimising air freight. Even small changes in a case study demonstrate awareness of engineering responsibility.
还要考虑碳足迹：运输距离、注塑的能源来源以及包装。建议使用再生纸板做包装，并尽量减少空运。在案例分析中即便只是微小的改变，也显示出了工程责任意识。
9. Practical Example: Redesigning a Bicycle Phone Holder | 实战案例：重新设计自行车手机支架
Let us apply all the above stages to a concrete task: a manufacturer asks you to improve an existing clamp‑type bike phone holder that is too heavy, blocks the headphone jack, and slips on rough roads. The target user is a teenager commuting to school.
让我们将以上所有阶段应用到一个具体任务上：某制造商要求你改进一款现有夹具式自行车手机支架，该支架过重、遮挡耳机插孔，且在颠簸路面上会滑动。目标用户是骑车上学的青少年。
First, restate the brief. Identified issues: mass 210 g, clamp applies uneven pressure, mounting bracket covers the phone’s bottom edge. New criteria: mass <140 g, four‑point silicone grip, full access to ports, IPX4 rating, withstands 3‑axis vibration of 5 Hz–50 Hz. Choose ABS for the main body due to its low density, good impact strength, and low cost. Use over‑moulded TPU for the grip pads to increase friction.
首先重述任务。识别到的问题：质量 210 g，夹具压力不均，安装支架遮盖了手机底部边缘。新标准：质量 <140 g，四点硅胶夹持，完全露出端口，IPX4 等级，耐受 5 Hz–50 Hz 的三轴振动。主体选择 ABS，因为它密度低、冲击强度好且成本低。夹持垫采用包覆成型的 TPU 以增加摩擦力。
Production plan: injection mould ABS body in a single‑cavity tool; heat‑stake brass inserts for the clamp screw; glue TPU pads with a cyanoacrylate primer. Assembly line uses a torque screwdriver to prevent overtightening. Quality control includes Go/No‑Go gauge for the clamp jaw opening and a water spray test to check IPX4.
生产计划：用单腔模具注塑 ABS 主体；热熔铜嵌件用于夹紧螺钉；用氰基丙烯酸酯底涂粘合 TPU 垫片。装配线使用扭矩螺丝刀防止过拧。质量控制包括用通止规检查夹爪开度，以及喷水试验检验 IPX4。
Electronic integration: a coin‑cell‑powered LED flashes when a piezo sensor detects excessive vibration. This encourages the rider to slow down. The circuit is housed in a small compartment sealed with an O‑ring. The BOM (Bill of Materials) totals 12 parts, keeping assembly simple.
电子集成：当压电传感器检测到剧烈振动时，纽扣电池驱动的 LED 会闪烁，提醒骑行者减速。电路安装在一个带 O 形圈密封的小隔间内。物料清单总计 12 个零件，保持装配简单。
Test results: prototype survived 50 drops, water spray passed, and vibration warning activated above 2 g. Total mass 132 g, meeting the target. End‑of‑life: ABS can be granulated and re‑extruded. The TPU pads are harder to recycle, but the small quantity means the overall recyclability rate exceeds 90 %.
测试结果：原型通过 50 次跌落，喷水试验通过，超过 2 g 振动时警告启动。总质量 132 g，满足目标。寿命终止：ABS 可粉碎再挤出，TPU 垫片较难回收，但由于用量小，整体可回收率超过 90 %。
10. Preparing Your Case Study Report | 准备案例分析报告
The final step is to structure your written response so that examiners can follow your logic easily. Use clear headings: Introduction, Research, Specification, Design Ideas, Final Design, Manufacturing Plan, Testing & Evaluation, Sustainability, Conclusion.
最后一步是组织你的书面答复，使考官能轻松追随你的逻辑。使用清晰的标题：引言、调研、规格、设计构思、最终设计、制造计划、测试与评估、可持续性、结论。
Support every decision with evidence. When you choose ABS over PLA, cite the datasheet values for impact strength. When you propose injection moulding, explain the economic batch size. Use annotated sketches, graphs, and tables; they communicate ideas faster than paragraphs. Always relate your solutions back to the original brief.
每一个决策都要有证据支撑。当你在 ABS 和 PLA 之间选择时，引用数据表中的冲击强度值。当你建议使用注塑成型时，解释经济批量。使用带注释的草图、图表和表格，它们比段落更快地传达想法。始终将你的方案与最初的任务要求联系起来。
Proofread for technical accuracy. Check that calculations are dimensionally consistent and that material names are correct. Use correct terminology: ‘malleable’ instead of ‘bendy’, ‘fatigue limit’ instead of ‘gets weak after many cycles’. Polished language reflects professional thinking.
检查技术准确性。确保计算量纲一致，材料名称正确。使用正确的术语：“可锻的”而不是“易弯的”，“疲劳极限”而不是“多次循环后变弱”。精炼的语言反映了专业的思维。
Finally, manage your time. In an examination, allocate about 10 minutes to read and plan, 30 minutes to write, and 5 minutes to review. Practise with past papers under timed conditions, using the structured approach outlined here.
最后，管理好你的时间。在考试中，分配约 10 分钟阅读和规划，30 分钟书写，5 分钟检查。使用这里概述的结构化方法，在计时条件下练习历年真题。
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