Case Study Practical Exercises | 案例分析实战演练

📚 Case Study Practical Exercises | 案例分析实战演练

Engineering is not just about equations and diagrams; it is a practical discipline that solves real-world problems. A case study allows you to step into the shoes of an engineer, applying the design process to a specific scenario. This article provides a hands-on walkthrough of engineering case study exercises, tailored for KS3 learners, to build analysis, creativity, and evaluation skills.

工程学不仅仅是方程式和图表，它是一门解决实际问题的应用学科。案例分析能让你代入工程师的角色，将设计流程应用到具体情境中。本文为 KS3 学生提供工程案例分析的实操指南，通过逐步演练培养分析、创造和评估能力。

1. What Is an Engineering Case Study? | 什么是工程案例分析？

An engineering case study is a detailed examination of a particular challenge or design scenario. It mirrors the work of real engineers by requiring you to identify needs, research, brainstorm solutions, and refine them through testing. At KS3 level, case studies often focus on everyday problems like building a stable structure or designing a simple mechanical system.

工程案例分析是对某个具体挑战或设计场景的详细探究。它让你像真正的工程师一样，需要识别需求、开展研究、头脑风暴解决方案，并通过测试进行改进。在 KS3 阶段，案例分析通常关注日常问题，如搭建稳固结构或设计简单的机械系统。

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2. Defining the Problem Clearly | 明确定义问题

Every case study begins with a clear problem statement. You must understand the client’s needs, constraints, and success criteria. For example, “Design a bridge from limited materials that can support 500 g without collapsing.” Write down the objective and any restrictions, such as budget, available tools, or environmental factors.

每个案例分析都从明确的问题陈述开始。你必须理解客户的需求、限制条件和成功标准。例如，“用有限材料设计一座能支撑 500 克重物而不坍塌的桥”。写下目标和所有限制，如预算、可用工具或环境因素。

This step prevents you from wandering off-track. A well-defined problem becomes your compass throughout the project. Use the ‘5 Ws’ (Who, What, Where, When, Why) to fully explore the context.

这一步能防止你偏离方向。一个定义清晰的问题会成为整个项目的指南针。可以运用“5W”法（谁、什么、哪里、何时、为什么）充分探究背景。

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3. Research and Background Investigation | 研究与背景调查

Engineers never start from scratch. Research existing solutions, materials, and scientific principles. If you are designing a catapult, investigate levers, stored energy, and projectile motion. Collect data on material strengths, such as the bending stiffness of cardboard or the tensile strength of string.

工程师从不凭空开始。研究现有的解决方案、材料和科学原理。如果你在设计投石机，就要研究杠杆、储能和抛体运动。收集材料强度数据，比如纸板的抗弯刚度或绳子的抗拉强度。

Use library books, trusted websites, or simple experiments. Note down your findings in an organised table. For KS3, a simple table comparing wood, plastic, and metal for a model tower is enough: density, cost, and ease of cutting.

利用图书馆书籍、可信网站或简单实验。将发现整理成表格。对于 KS3，比较木材、塑料和金属用于模型塔的密度、成本与切割难度的简单表格就足够了。

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4. Generating Creative Design Ideas | 构思创意设计方案

This is the brainstorming stage. Sketch at least three different ideas, no matter how wild they seem. Use annotations to explain how each idea meets the brief. For a flood-proof house, you might draw a raised platform, a floating base, or water-resistant barriers.

这是头脑风暴阶段。至少画出三种不同的想法草图，无论它们看起来多么天马行空。用注释解释每个想法如何满足设计要求。对于防洪房屋，你可以画出高架平台、浮动基座或防水屏障。

Encourage divergent thinking—quantity over quality at this point. Label key features and materials. Later, you will evaluate them against the criteria. A simple pros-and-cons list next to each sketch helps organise your thoughts.

鼓励发散思维——此时数量比质量更重要。标注关键特征和材料。稍后，你将根据标准对它们进行评估。在每个草图旁列出优缺点，有助于梳理思路。

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5. Evaluating and Selecting the Best Solution | 评价与选择最佳方案

Now apply decision-making tools. A decision matrix helps rank ideas based on criteria like cost, performance, and ease of construction. Assign a score from 1 to 5 for each criterion and multiply by a weighting factor if one criterion is more important.

现在运用决策工具。决策矩阵有助于根据成本、性能和施工便利性等标准对想法进行排序。为每项标准打分（1到5分），如果某项标准更重要，可乘以权重系数。

For example, if safety is paramount, give it a weight of 3. Calculate total scores to find the highest-ranked concept. This systematic approach mirrors real engineering reviews and reduces personal bias.

例如，如果安全至上，可赋予权重 3。计算总分以找到排名最高的概念。这种系统化方法反映了真实的工程评审，并减少了个人偏见。

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6. Detailed Design and Simple Calculations | 详细设计与简单计算

Once you have chosen your solution, develop it in detail. This involves dimensioned drawings, material lists, and basic calculations. For a beam supporting a load, you might calculate the maximum bending moment using the formula:

选定解决方案后，要进一步细化。这包括带尺寸的图纸、材料清单和基本计算。对于支撑荷载的梁，你可能需要计算最大弯矩，公式为：

M = F × d

where M is the moment (N·m), F is the force (N), and d is the distance from the support (m). This is a simplified approach for KS3, but it introduces the concept of forces causing rotation.

其中 M 是弯矩（牛·米），F 是力（牛），d 是到支撑点的距离（米）。这是 KS3 阶段的简化方法，但引入了力导致转动的概念。

If building a lever, explore mechanical advantage:

MA = effort arm / load arm

These calculations don’t need to be complex but must be accurate. Always include units and show your working step by step, just as a professional engineer would.

这些计算不需要很复杂，但必须准确。务必包含单位并逐步展示计算过程，就像专业工程师所做的那样。

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7. Materials and Manufacturing Considerations | 材料与制造考量

Selecting the right material is crucial. Think about properties like strength, density, flexibility, and cost. At KS3, you might choose between balsa wood, acrylic sheet, or recycled cardboard. Discuss how you will shape and join the materials—g glue, tape, or nuts and bolts.

选择合适的材料至关重要。要考虑强度、密度、柔韧性和成本等属性。在 KS3 阶段，你可能需要在轻木、亚克力板或回收纸板之间做出选择。讨论你将如何加工和连接材料——用胶水、胶带还是螺母螺栓。

Create a simple manufacturing plan with numbered steps. For a cardboard chair, steps could be: 1) cut two side panels, 2) score fold lines, 3) assemble with interlocking tabs, 4) test for stability. This plan demonstrates awareness of real-world production.

制定一个简单的制造计划，列出编号步骤。对于纸板椅子，步骤可以是：1) 切割两块侧板，2) 划出折叠线，3) 用互锁卡槽组装，4) 测试稳定性。该计划显示了对实际生产的认知。

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8. Prototyping, Testing, and Data Collection | 原型制作、测试与数据收集

Build a prototype based on your detailed design. It does not have to be perfect; its purpose is to test ideas. While testing, record quantitative data. If evaluating a wind turbine blade design, measure voltage output at different wind speeds using a multimeter.

根据详细设计制作原型。不需要完美，其目的是检验想法。测试时记录定量数据。如果评估风力涡轮机叶片设计，可使用万用表测量不同风速下的电压输出。

Organise data in a table:

Wind Speed (m/s)	Voltage (V)
2.0	0.5
3.5	1.2
5.0	2.1

Look for patterns and unexpected failures. A broken joint or wobbly structure teaches you more than a flawless first attempt. Photograph the prototype and annotate the photos with observations.

寻找规律和意外故障。一个断裂的接头或不稳的结构比一次完美的初次尝试让你学到更多。给原型拍照，并在照片上标注观察结果。

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9. Evaluation Against Criteria and Iteration | 根据标准评估与迭代

Compare your test results with the original success criteria. Did the bridge hold 500 g? Did the catapult fire the projectile over 2 m? Be honest about shortcomings. If the design failed, explain why using scientific reasoning—perhaps the centre of mass was too high.

将测试结果与最初的成功标准进行比较。桥是否支撑住了 500 克？投石机是否将抛射物投出 2 米以上？对缺点要实事求是。如果设计失败，用科学推理解释原因——可能是质心太高了。

Suggest improvements for a second iteration. Even simple sketches of a revised joint or a lighter material show engineering thinking. Iteration is the heart of the design process; products rarely work perfectly the first time.

提出第二次迭代的改进建议。哪怕是修改后的接头或更轻材料的简单草图，也展现了工程思维。迭代是设计流程的核心；产品很少一次就完美运行。

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10. Presenting the Case Study Effectively | 有效展示案例分析

Communication is a key engineering skill. Your case study should be presented in a clear, structured report or poster. Include sections: problem, research, design ideas, selected solution, development, testing, evaluation, and references.

沟通是一项关键的工程技能。你的案例分析应以清晰、结构化的报告或海报呈现。包含以下部分：问题、研究、设计方案、选定的解决方案、详细展开、测试、评估和参考文献。

Use labelled diagrams, flowcharts, and photographs. Avoid huge blocks of text; instead, use bullet points for key facts. A well-organised case study shows you are not just a builder but a thinker.

使用带标注的图表、流程图和照片。避免大段文字；关键事实可用要点列出。一个组织良好的案例分析表明你不仅是建造者，更是思考者。

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11. Common Mistakes and How to Avoid Them | 常见误区与避免方法

One common mistake is jumping straight to building without enough research or planning. This leads to fragile prototypes. Another is ignoring constraints—design a solution that uses too many expensive or unavailable materials.

一个常见误区是没有充分研究和规划就直接动手建造，这会导致原型脆弱。另一个错误是忽视限制条件——设计使用了过多昂贵或无法获得的材料。

Also, avoid weak testing. A single test with no repeated measurements gives unreliable data. Always carry out at least three trials and calculate an average. Finally, don’t dismiss failed designs; they are valuable learning opportunities.

此外，要避免测试不充分。一次测试没有重复测量，数据就不可靠。务必至少进行三次试验并计算平均值。最后，不要轻视失败的设计，它们是宝贵的学习机会。

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12. Real-World Inspiration: The Mars Rover Case | 现实灵感：火星车案例

To see how case studies work in real engineering, look at NASA’s Mars rovers. Engineers had to design a vehicle that could land safely, navigate rocky terrain, and carry scientific instruments. Constraints included weight, extreme temperatures, and communication delay.

要了解案例分析在实际工程中如何运作，可以看看 NASA 的火星车。工程师必须设计一辆能安全着陆、在岩石地形上行驶并携带科学仪器的车辆。限制条件包括重量、极端温度和通信延迟。

They tested prototypes in deserts, iterated the suspension design, and used decision matrices to select materials like aluminium and titanium. This mirrors your KS3 case study, just on a grander scale. It shows that systematic engineering is universal.

他们在沙漠中测试原型，迭代悬挂设计，并使用决策矩阵选择铝和钛等材料。这与你的 KS3 案例分析相似，只是规模更大。这表明系统化的工程设计是普适的。

Published by TutorHao | Engineering Revision Series | aleveler.com

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