📚 Year 7 Edexcel Engineering: Case Study Workshop | 七年级Edexcel工程：案例分析实战演练
Engineering isn’t just about memorising facts – it’s about solving problems by thinking creatively and applying scientific ideas in practical ways. In this case study workshop, we will walk through a complete engineering challenge step by step. You will see how real engineers use a structured design process to move from an initial problem to a finished, tested prototype. Whether you are preparing for a class project or simply want to understand how things are made, this hands‑on case study will give you the tools to think like an engineer.
工程学不仅仅是记住事实——它是通过创造性思维和实际应用科学原理来解决问题。在这个案例分析工作坊中，我们将逐步完成一个完整的工程挑战。你将看到真正的工程师如何使用结构化的设计流程，从最初的问题过渡到最终经过测试的原型。无论你是在准备课堂项目，还是单纯想了解事物是如何制造出来的，这个动手案例都将赋予你像工程师一样思考的工具。
1. The Engineering Design Process | 工程设计流程
Every engineering project follows a cycle: Identify, Research, Design, Build, Test, Evaluate, and Improve. This is often called the iterative design process because it repeats until the best solution is found. For Year 7 students, Edexcel expects you to recognise these stages and apply them in simple challenges.
每个工程项目都遵循一个循环：识别、研究、设计、建造、测试、评估和改进。这通常被称为迭代设计流程，因为它会不断重复，直到找到最佳解决方案。对于七年级学生，Edexcel 希望你们能够识别这些阶段，并将其应用于简单的挑战中。
In our case study we will tackle the Paper Bridge Challenge. This is a classic engineering task that helps you understand forces, material properties, and structural stability. By the end, you will have created a bridge out of newspaper and glue that can hold as much mass as possible over a 30 cm gap.
在我们的案例中，我们将攻克“纸桥挑战”。这是一个经典的工程任务，可以帮助你理解力、材料特性和结构稳定性。最后，你将用报纸和胶水建造一座桥，使其在 30 厘米的跨度上尽可能多地承载质量。
2. Case Study Overview: The Paper Bridge Challenge | 案例概述：纸桥挑战
The challenge is straightforward: design and build a bridge using only recycled newspaper and PVA glue. The bridge must span a gap of 30 cm and support a load applied at the centre. The winner is the design that holds the greatest mass before failure. There are limits: the bridge can be no heavier than 200 g, and its deck must be at least 5 cm wide to allow a weight‑hanger to sit.
挑战非常直接：仅使用回收报纸和 PVA 胶水设计并建造一座桥。桥的跨度必须达到 30 厘米，并在中心承载载荷。胜出者是能在破坏前承受最大质量的设计。有限制条件：桥的总重量不得超过 200 克，桥面宽度至少要有 5 厘米，以便放置挂码器。
This task mirrors real civil engineering problems where bridges must carry traffic, withstand wind, and use materials efficiently. We will take you through the process exactly as an engineer would, from the first sketch to the final test.
这个任务反映了真实的土木工程问题，桥梁必须承载交通、承受风力并高效使用材料。我们将严格按照工程师的方式带你走完全过程，从第一张草图到最后的测试。
3. Identifying the Problem and Design Brief | 确定问题与设计概要
Before building anything, an engineer must fully understand the problem. Start by writing a design brief: a short paragraph that describes who the user is, what the product must do, and any key constraints. For our paper bridge, the user is a teacher or competition judge; the product must allow a weight to hang safely at mid‑span; constraints include mass limit, materials, and span.
在动手建造之前，工程师必须充分理解问题。先写一份设计概要——一小段话，描述用户是谁、产品必须做什么以及任何关键限制条件。对于我们的纸桥，用户是老师或比赛评委；产品必须允许砝码安全地悬挂在跨中；限制条件包括质量限制、材料和跨度。
Next, list the success criteria. A good criterion is measurable, such as “the bridge must hold at least 500 g without collapsing” or “the structure must weigh less than 180 g so there is glue mass left over.” This stage turns a vague idea into a clear goal you can test against.
接着，列出成功标准。一个好的标准是可衡量的，例如“桥在倒塌前至少承重 500 克”或“结构重量必须少于 180 克，以便留出胶水质量”。这一阶段将一个模糊的想法变成一个可以检验的明确目标。
4. Research and Idea Generation | 调查研究与构思生成
Now explore what already exists. Research different bridge types: beam bridges, arch bridges, suspension bridges, and truss bridges. A beam bridge is the simplest – a flat deck supported at both ends – but it tends to sag in the middle. An arch bridge transfers load outward to the supports, making it stronger if built properly. A truss uses triangles to spread forces and is very efficient for paper.
现在探索已有的方案。研究不同类型的桥梁：梁桥、拱桥、悬索桥和桁架桥。梁桥是最简单的——两端支撑的平直桥面——但中间容易下凹。拱桥将载荷向外传递到支撑点，如果建造得当会更坚固。桁架桥使用三角形来分散力，对纸质材料来说效率非常高。
Sketch at least three rough ideas in your notebook. Label the parts and note which forces – tension, compression, bending – act on each member. Don’t judge your ideas yet; just get them down. Engineers call this divergent thinking, and it is essential for innovation.
在笔记本中至少画出三种粗略构思。标注各个部分，并注明哪些力——拉力、压力、弯曲力——作用在各个构件上。先不要评判你的想法，只要画出来。工程师称此为发散思维，它对创新至关重要。
5. Selecting Materials and Planning | 选择材料与规划
You have only two materials: newspaper and PVA glue. Newspaper is weak in its flat form, but when rolled into tight tubes it becomes surprisingly stiff and strong. This is because a tube spreads compression around its circumference. Plan to make at least three types of members: thick tubes for the main beams, thinner tubes for truss diagonals, and flat strips for the deck.
你只有两种材料：报纸和 PVA 胶水。摊开的报纸很脆弱，但卷成紧密的纸管后，它会变得惊人地坚硬和结实。这是因为管子能将压力沿圆周分散。计划制造至少三种构件：粗管做主梁，细管做桁架斜杆，平条做桥面板。
Draw a dimensioned plan of your chosen design. Mark the length of each tube, where they join, and how the load will be applied. Estimate the mass of each component to stay under the 200 g limit. Remember that the glue adds mass, so use it sparingly but strong enough to hold joints together.
为你选择的设计画一份标注尺寸的平面图。标记每根管的长度、连接处以及载荷将如何施加。估算每个部件的质量，以确保总重不超过 200 克。记住胶水会增加重量，因此要节省使用，但又要足够牢固以粘接节点。
6. Tools, Equipment and Safety | 工具、设备与安全
For this project you will need: old newspapers, PVA glue, a ruler, scissors, a craft knife (optional, under supervision), a cutting mat, and a weighing scale. Always use scissors carefully and cut away from your body. If using a craft knife, an adult must supervise. Wear an apron to protect your clothes from glue spills.
本项目你需要：旧报纸、PVA 胶水、一把直尺、剪刀、刻刀（可选，需在监督下使用）、切割垫和一台秤。始终小心使用剪刀，朝远离身体的方向裁剪。如果使用刻刀，必须有成人监督。穿上围裙，防止胶水弄脏衣服。
Set up your workspace with plenty of light and a flat surface. Keep a damp cloth nearby to wipe up glue. Good organisation prevents mistakes: label your rolled tubes with sticky notes so you don’t mix up the sizes. Engineers call this “process planning” and it saves time during building.
布置好工作区域，提供充足的光线和平整的台面。手边放一块湿布以擦除胶水。良好的整理可以避免出错：用便利贴给卷好的纸管做标记，以免弄混尺寸。工程师称之为“流程规划”，它能在建造阶段节省时间。
7. Building the Prototype | 制作原型
Start by rolling your newspaper tubes. Lay a sheet of newspaper flat, place a thin dowel or a pencil along one edge, and roll it up tightly. Glue the final flap to stop it unrolling. Remove the pencil. The longer the tube, the more likely it is to buckle – try to keep lengths under 30 cm.
首先卷报纸管。将一张报纸平铺，把一根细圆棒或铅笔放在一边缘，然后紧紧地卷起来。用胶水粘住最后掀起的纸边以防止散开。抽出铅笔。管子越长越容易弯曲——尽量使长度保持在 30 厘米以内。
Assemble the main frame according to your plan. Use triangle jigs made from scrap paper to hold pieces at the correct angle while the glue sets. Apply glue to joints, press firmly, and let them dry completely – patience here makes the bridge much stronger. Build the deck last and attach it to the trusses with small glue tabs.
按照你的计划组装主体框架。用废纸做的三角形定位块在胶水固化时固定各部件于正确的角度。在节点涂上胶水，压紧，等待完全干透——这里的耐心会让桥坚固很多。最后制作桥面，用小胶条将它粘接到桁架上。
8. Testing and Recording Results | 测试与记录结果
Place your bridge across two tables set exactly 30 cm apart. Hang a light‑weight hanger at the mid‑span, then carefully add masses one by one. Record the mass every time the bridge withstands the load for 10 seconds without cracking. When a failure occurs, note the type: did a joint snap, or did a tube buckle?
将你的桥横跨在两张间隔恰好 30 厘米的桌子上。在跨中悬挂一个轻质挂钩，然后小心地逐一添加砝码。每当桥在无破裂的情况下承受载荷 10 秒时记录质量。当发生破坏时，记录破坏类型：是某个节点断裂，还是某根管子压屈？
It is good practice to test more than one prototype. Use the table below to collect data. By comparing results, you can see which design strategy works best. Remember that a fair test means keeping conditions the same – same span, same loading point, same environment.
测试多个原型是一个好做法。使用下表收集数据。通过比较结果，你可以看出哪种设计策略效果最好。记住，公平测试意味着保持条件一致——相同的跨度、相同的加载点和相同的环境。
| Prototype | Bridge mass (g) | Maximum load (g) | Type of failure | Notes |
|---|---|---|---|---|
| 1 (Single beam) | 150 | 320 | Bending in deck | Too flexible |
| 2 (Warren truss) | 190 | 1250 | Joint shear | Strong but failed at glue |
| 3 (Arch with tie) | 210 | 980 | Buckling of arch | Overweight & broke inward |
Example test data for three prototypes | 三个原型的测试数据示例
9. Evaluation and Improvements | 评估与改进
Look at your test results and ask: Did the bridge meet the success criteria? If not, why? Which part failed first? Use technical terms to describe the failure, such as “tensile failure in the bottom chord” or “compressive buckling of the top tube”. This analysis helps you target the weakest point.
审视你的测试结果并问：桥是否达到了成功标准？如果没有，为什么？哪个部分最先破坏？用专业术语描述破坏，例如“下弦杆受拉破坏”或“上弦管受压屈曲”。这样的分析有助于你锁定最薄弱的点。
Now propose at least two improvements. For example, you might double‑up tubes in areas of high compression or reinforce joints with gusset plates made from newspaper. Redesign the bridge on paper and, if time allows, build a second version. In industry, this feedback loop turns an okay product into an excellent one.
现在提出至少两处改进。例如，你可以在高压力区域加倍管材，或用报纸制成的角撑板加强节点。在纸上重新设计桥梁，如果时间允许，再制作第二个版本。在工业中，这种反馈循环能将一个尚可的产品变成优秀的产品。
10. Reflection and Key Takeaways | 反思与关键收获
Engineering is rarely about getting it right the first time. The most important skills you have practised are not just building, but planning, testing, recording, and improving. Think about how your teamwork functioned: did everyone have a role? Did you communicate ideas clearly? These soft skills are as vital as technical know‑how in any engineering career.
工程学很少一次就能做对。你练习的最重要技能不仅是建造，而是规划、测试、记录和改进。回想一下你的团队合作如何运作：每个人都扮演了角色吗？你们清晰沟通想法了吗？在任何工程职业生涯中，这些软技能与技术本领同样至关重要。
Finally, connect this activity to real‑world structures. The Millau Viaduct in France and the Forth Bridge in Scotland both use triangles to manage enormous loads. Your paper tubes are tiny cousins of the steel beams in those bridges. By understanding a simple newspaper bridge, you have walked a few steps in the shoes of a civil engineer.
最后，将这项活动与现实世界的结构联系起来。法国的米约高架桥和苏格兰的福斯桥都使用三角形来承受巨大的载荷。你的纸管正是那些桥梁中钢梁的微型表亲。通过理解一座简单的报纸桥，你已经循着土木工程师的足迹走了几步。
Published by TutorHao | Engineering Revision Series | aleveler.com
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