AS AQA Engineering: Case Study Practical Exercises | AS AQA 工程：案例分析实战演练

📚 AS AQA Engineering: Case Study Practical Exercises | AS AQA 工程：案例分析实战演练

In AS AQA Engineering, the case study component challenges you to apply your knowledge to a real-world engineering product or system. This practical exercise guides you through a structured analysis of a simple adjustable laptop stand, helping you master the skills needed to evaluate materials, manufacturing processes, structural integrity, sustainability, safety, and cost. Treat this as a simulation of the case study exam — ask yourself the right questions and develop thorough, engineering-based answers.

在 AS AQA 工程中，案例分析部分要求你将所学知识应用于真实的工程产品或系统。本次实战演练将引导你系统地分析一款简单的可调节笔记本电脑支架，帮助你掌握评估材料、制造工艺、结构完整性、可持续性、安全性和成本所需的技能。把它当作案例研究考试的一次模拟——向自己提出正确的问题，并给出基于工程原理的深入回答。

1. Understanding the Case Study Context | 理解案例背景

Begin by carefully reading the case study description. Your product is a portable, aluminum laptop stand with adjustable height and angle, designed for home office use. Understand the product’s primary functions: elevating the laptop screen to eye level, providing stability, and allowing ventilation. Identify the end-user needs such as ergonomics, durability, and portability. Ask: what problem does this product solve?

首先仔细阅读案例描述。你的产品是一款便携式铝制笔记本电脑支架，具有可调节的高度和角度，设计用于居家办公。理解产品的主要功能：将笔记本电脑屏幕提升至视线水平、提供稳定性并保证通风。识别最终用户的需求，例如人体工程学、耐用性和便携性。问自己：这款产品解决了什么问题？

Consider the operating environment: desks, coffee shops, and possibly on laps. The stand must withstand repeated adjustments and occasional knocks. Note any constraints like size compatibility with various laptop models (from 11-inch to 17-inch). Your analysis must always refer back to the original specification.

考虑使用环境：书桌、咖啡店，甚至可能放在腿上。支架必须承受反复调节和偶尔的磕碰。注意任何限制条件，例如与各种笔记本电脑型号（从 11 英寸到 17 英寸）的尺寸兼容性。你的分析必须始终紧扣原始规格。

2. Identifying Key Requirements & Constraints | 识别关键需求与约束条件

Primary functional requirements include: height adjustment from 10 cm to 25 cm, tilt angle from 0 degrees to 30 degrees, load capacity at least 5 kg (to accommodate a laptop plus accessories), and a non-slip base. The product must be lightweight, easy to carry, and stable on different desk surfaces.

主要功能要求包括：高度可调节范围 10 cm 至 25 cm，倾斜角度 0 度至 30 度，负载能力至少 5 kg（以容纳笔记本电脑及配件），以及防滑底座。产品必须轻便、易于携带，并在不同桌面上保持稳定。

Key constraints to consider: the material must weigh less than 500 g to ensure portability; raw material cost per unit should stay below £3; all edges must be radiused or deburred to avoid injury; assembly must require no specialised tools. The design must also be manufacturable using standard workshop processes at moderate volumes.

需要考量的关键约束：材料重量须小于 500 g 以保证便携性；单件原材料成本应低于 £3；所有边缘必须倒圆角或去毛刺以防受伤；装配不得需要专用工具。设计还必须能使用标准车间工艺以中等批量制造。

3. Materials Selection Analysis | 材料选择分析

The chosen material, aluminium alloy 6061-T6, offers an excellent blend of properties: density 2.7 g/cm³, tensile strength approximately 310 MPa, and yield strength about 276 MPa. Its natural corrosion resistance can be enhanced by anodising, which also provides an attractive finish. Alloying elements magnesium and silicon give 6061 much better strength than pure aluminium, making it ideal for structural components.

选用的材料 6061-T6 铝合金提供了出色的性能组合：密度 2.7 g/cm³，抗拉强度约 310 MPa，屈服强度约 276 MPa。其天然的耐腐蚀性可通过阳极氧化增强，并获得美观的表面。合金元素镁和硅使 6061 的强度远超纯铝，因此非常适合结构部件。

Compared with alternatives: mild steel offers higher strength but is roughly three times denser and requires protective coatings to prevent rust, adding cost and weight. ABS plastic is light and cheap but lacks stiffness, may creep under sustained load, and feels less premium. Carbon fibre composite meets all mechanical goals but is far too expensive for a budget product. 6061 aluminium balances strength, weight and cost effectively.

与其他材料对比：低碳钢强度更高，但密度约为铝的三倍，且需要防护涂层防锈，增加了成本和重量。ABS 塑料轻便廉价，但刚度不足，持续负载下可能蠕变，且手感不够高档。碳纤维复合材料满足所有力学目标，但对于平价产品过于昂贵。6061 铝合金有效平衡了强度、重量与成本。

To improve sustainability, specify recycled aluminium where possible. Post-consumer 6061 scrap can be remelted and reprocessed into sheet, using only about 5% of the energy needed for primary smelting. This significantly lowers the embodied energy without compromising mechanical properties.

为了提升可持续性，在可能的情况下指定使用再生铝。消费后 6061 废料可重熔再加工成板材，其能耗仅为一次冶炼的约 5%。这显著降低了蕴含能量且不影响力学性能。

4. Manufacturing Process Evaluation | 制造工艺评估

The main structural components are two side arms and a connecting hinge. For medium-scale production (e.g. 5,000 units/year), the arms can be fabricated from 2 mm thick 6061 sheet by CNC laser cutting, followed by press-brake bending to form ergonomic curves. Laser cutting ensures precise profiles and smooth edges with minimal post-processing.

主要结构件为两个侧臂和一个连接铰链。对于中等规模生产（例如年产 5000 件），侧臂可用 2 mm 厚 6061 板材通过 CNC 激光切割，再经折弯机弯曲以形成符合人体工学的曲线。激光切割能保证精确轮廓和光滑边缘，减少后续加工。

Hinge brackets can be produced by die-casting an aluminium alloy, which offers high consistency at high volumes but requires expensive tooling. Alternatively, CNC machining from solid billets provides flexibility for small batches. In this exercise, evaluate the break-even point: if production exceeds 10,000 units, die-casting becomes more economical; below that, machining may be preferable.

铰链支架可通过压铸铝合金制造，在大批量时一致性高，但模具成本昂贵。另一种选择是 CNC 机加工实心坯料，为小批量提供灵活性。在本演练中，评估盈亏平衡点：若产量超过 10,000 件，压铸更经济；低于此数，机加工或许更优。

Surface finishing: after deburring and cleaning, parts undergo glass-bead blasting to create a uniform matte texture, then clear or coloured anodising. Anodising forms a hard aluminium oxide layer that resists scratches and wear. No painting is required, eliminating volatile organic compound (VOC) emissions.

表面处理：去毛刺并清洁后，部件经过玻璃喷砂以获得均匀的哑光质感，再进行透明或彩色阳极氧化。阳极氧化形成坚硬的氧化铝层，耐刮耐磨。无需喷漆，

Published by TutorHao | AS 工程 Revision Series | aleveler.com

更多咨询请联系16621398022（同微信）