📚 Year 10 SQA Engineering: Core Knowledge Points Review | Year 10 SQA 工程：核心知识点梳理
Engineering is the application of science and mathematics to solve real-world problems through designing, building, and testing structures, machines, devices, and systems. For Year 10 students following the SQA curriculum, mastering the foundational knowledge of engineering prepares you for further study and careers in a vast range of industries. This article consolidates the core knowledge points you need to understand, from design principles and material selection to electronics, mechanics, and sustainable engineering.
工程学是应用科学和数学知识，通过设计、建造和测试结构、机器、设备和系统来解决现实世界的问题。对于遵循 SQA 课程的 10 年级学生来说，掌握工程学的基础知识将为你未来在广泛行业领域的学习和职业发展做好准备。本文梳理了你需要理解的核心知识点，涵盖设计原则、材料选择、电子技术、机械原理以及可持续工程。
1. Engineering Sectors and Professional Responsibilities | 工程领域与职业责任
Engineers work across diverse sectors including automotive, aerospace, civil, electrical, and biomedical engineering. In all these fields, professional responsibilities such as adhering to codes of practice, maintaining confidentiality, and protecting public safety are vital.
工程师工作在汽车、航空航天、土木、电气和生物医学等众多领域。在所有这些领域中，遵守从业守则、保守机密和维护公共安全等职业责任至关重要。
All engineers must follow health and safety legislation like the Health and Safety at Work Act. Risk assessments identify hazards, evaluate the likelihood of harm, and define control measures to reduce risks to an acceptable level.
所有工程师都必须遵守《工作健康与安全法》等立法。风险评估用于识别危险源，评估发生伤害的可能性，并确定控制措施，将风险降低到可接受的水平。
Personal protective equipment (PPE), such as safety goggles, steel-toe boots, and high-visibility vests, is mandatory in workshops and on construction sites. Good housekeeping prevents trips, slips, and fires.
在车间和建筑工地上，必须使用个人防护设备（PPE），例如安全护目镜、防砸鞋和高可见度背心。良好的内务管理可以防止绊倒、滑倒和火灾。
2. The Engineering Design Process | 工程设计流程
The design process is cyclical and involves identifying a need, researching, generating ideas, developing a design brief and specification, creating solutions, and evaluating outcomes. Iterative design means repeating steps to refine the product until it meets all requirements.
设计过程是循环的，包括确定需求、调研、产生创意、制定设计摘要和规范、创建解决方案以及评估成果。迭代设计意味着重复某些步骤来改进产品，直到它满足所有要求。
A design brief clearly states the problem, target market, and constraints. A detailed specification lists measurable criteria such as dimensions, weight, materials, cost, and performance targets.
设计摘要清晰地陈述问题、目标市场和限制条件。详细的规范列出可测量的标准，例如尺寸、重量、材料、成本和性能目标。
Engineers use technical drawings, Computer-Aided Design (CAD) models, and simulations to communicate ideas. Orthographic projections show multiple 2D views, while isometric drawings give a 3D representation.
工程师使用技术图纸、计算机辅助设计（CAD）模型和仿真来传达想法。正投影图展示多个二维视图，而等轴测图则提供了三维表示。
3. Materials Classification and Properties | 材料分类与特性
Materials are grouped into metals, polymers, ceramics, composites, and smart materials. Ferrous metals contain iron (e.g., mild steel, cast iron), while non-ferrous metals do not (e.g., aluminium, copper). Alloys like stainless steel combine elements for enhanced properties.
材料分为金属、聚合物、陶瓷、复合材料和智能材料。黑色金属含铁（如低碳钢、铸铁），有色金属不含铁（如铝、铜）。像不锈钢这样的合金结合了多种元素以获得增强性能。
Key mechanical properties include tensile strength, compressive strength, hardness, toughness, ductility, and elasticity. Physical properties such as density, thermal conductivity, and electrical conductivity influence material selection for specific uses.
关键的力学特性包括抗拉强度、抗压强度、硬度、韧性、延展性和弹性。密度、热导率和电导率等物理特性会影响特定用途的材料选择。
Engineers match materials to applications. For example, copper is chosen for electrical wiring due to its high conductivity and ductility, while carbon fibre composites are used in aerospace for their high strength-to-weight ratio.
工程师根据应用需求匹配材料。例如，铜因其高导电性和延展性被选作电线材料，而碳纤维复合材料因其高强度重量比被用于航空航天。
| Material | 典型特性 | 常见应用 |
|---|---|---|
| 低碳钢 | 强度高，价格低廉，可焊接 | 建筑框架，汽车车体 |
| 铝合金 | 轻质，耐腐蚀 | 飞机蒙皮，饮料罐 |
| ABS 塑料 | 韧性好，易于成型 | 电子外壳，乐高积木 |
4. Mechanisms and Mechanical Systems | 机构与机械系统
Mechanisms change the magnitude, direction, or type of motion. Levers, linkages, gears, cams, and pulleys are fundamental machine elements. Mechanical advantage (MA) is the ratio of output force to input force.
机构可以改变运动的大小、方向或类型。杠杆、连杆、齿轮、凸轮和滑轮是基本的机械元件。机械效益（MA）是输出力与输入力的比值。
gth / load arm length. A class 1 lever has the fulcrum between effort and load (e.g., scissors). Class 2 has load in the middle (e.g., wheelbarrow), and class 3 has effort in the middle (e.g., tweezers).
对于简单杠杆，机械效益 = 施力臂长 / 载荷臂长。第一类杠杆的支点在施力点和载荷之间（如剪刀）；第二类载荷在中间（如独轮车）；第三类施力点在中间（如镊子）。
Gear trains transmit torque. The gear ratio is calculated by dividing the number of teeth on the driven gear by the number of teeth on the driver gear. A ratio greater than 1 increases torque but reduces speed.
齿轮系传递扭矩。齿轮比由从动齿轮齿数除以主动齿轮齿数计算得出。比值大于 1 会增加扭矩但会降低转速。
Gear Ratio = Teeth on Driven / Teeth on Driver
Pulley systems reduce the effort needed to lift a load. The velocity ratio (VR) for pulleys equals the number of rope sections supporting the load.
滑轮系统减少了提升载荷所需的力。滑轮的速度比（VR）等于支撑载荷的绳索段数。
5. Electronics and Control Fundamentals | 电子与控制基础
Electronic systems have input, process, and output blocks. Input transducers like light-dependent resistors (LDRs) and thermistors convert physical changes into electrical signals. Output devices include LEDs, buzzers, and motors.
电子系统由输入、处理和输出模块组成。输入传感器（如光敏电阻和热敏电阻）将物理变化转换为电信号。输出设备包括 LED、蜂鸣器和电机。
Ohm's law governs the relationship between voltage (V), current (I), and resistance (R): V = I × R. Resistors limit current flow; variable resistors and potential dividers provide adjustable voltage outputs.
欧姆定律描述了电压 (V)、电流 (I) 和电阻 (R) 之间的关系：V = I × R。电阻器限制电流；可变电阻器和分压器提供可调的电压输出。
A microcontroller can be programmed to make decisions based on sensor inputs. For example, a PIC or Arduino board can monitor a temperature sensor and switch on a cooling fan when a threshold is exceeded.
微控制器可以编程以根据传感器输入做出决策。例如，PIC 或 Arduino 板可以监测温度传感器并在超过设定值时打开冷却风扇。
Basic logic gates (AND, OR, NOT) form the building blocks of digital control. Truth tables define their input-output relationships.
基本逻辑门（与、或、非）是数字控制的基石。真值表定义了它们的输入输出关系。
6. Structural Engineering Concepts | 结构工程概念
Structures must withstand forces without excessive deformation or collapse. Common structural members include beams, columns, trusses, and ties. Forces experienced are tension, compression, bending, shear, and torsion.
结构必须能够承受外力而不产生过度变形或倒塌。常见的结构构件包括梁、柱、桁架和拉杆。构件承受的力包括拉力、压力、弯曲、剪切和扭转。
When a beam bends, the top surface is under compression and the bottom under tension. The neutral axis experiences no stress. Engineers use triangular shapes in trusses because triangles cannot be deformed without changing side lengths, providing rigidity.
当梁弯曲时，上表面受压，下表面受拉。中性轴不承受应力。工程师在桁架中使用三角形，因为三角形在不改变边长的情况下无法变形，从而提供了刚性。
The moment of a force about a point is the force multiplied by the perpendicular distance from the point. M = F × d. The principle of moments states that for an object in rotational equilibrium, the sum of clockwise moments equals the sum of anticlockwise moments.
力对一点的力矩等于力乘以该点到力作用线的垂直距离。M = F × d。 力矩原理指出，对于处于转动平衡的物体，顺时针力矩之和等于逆时针力矩之和。
Reaction forces at supports balance external loads. Calculating reactions is essential for ensuring structural safety and selecting appropriate beam sizes.
支座反力与外部载荷平衡。计算反力对于确保结构安全和选择合适的梁尺寸至关重要。
7. Pneumatic and Hydraulic Systems | 气动与液压系统
Both systems use pressurised fluids to transmit force. Pneumatic systems use compressed air; hydraulic systems use liquid, typically oil. Pascal's law states that pressure applied to an enclosed fluid is transmitted undiminished in all directions.
两种系统都使用受压流体来传递力。气动系统使用压缩空气；液压系统使用液体，通常是油。帕斯卡定律指出，施加在封闭流体上的压力会大小不变地向各个方向传递。
A typical system includes a compressor or pump, valves for direction and flow control, and actuators (cylinders or motors). 5/2 directional control valves are common in pneumatics to control double-acting cylinders.
典型系统包括压缩机或泵、方向与流量控制阀以及执行器（气缸或马达）。5/2 方向控制阀在气动系统中常用于控制双作用气缸。
Circuit diagrams use standard symbols. Students must be able to read and draw these diagrams, understanding how actuation of valves causes cylinder extension and retraction in a given sequence.
回路图使用标准符号。学生必须能够阅读和绘制这些图表，理解阀门的驱动如何使气缸按照给定顺序伸出和缩回。
8. Energy, Power, and Efficiency | 能量、功率与效率
Energy is the capacity to do work, measured in joules (J). Power is the rate of energy transfer, measured in watts (W). Efficiency compares useful output energy or power to total input: Efficiency (%) = (Useful output / Total input) × 100.
能量是做功的能力，单位为焦耳 (J)。功率是能量传递的速率，单位为瓦特 (W)。效率比较有用输出能量或功率与总输入的比值：效率 (%) = (有用输出 / 总输入) × 100。
In mechanical systems, power can be calculated as P = F × v (force × velocity). Electrical power is P = I × V or P = I² × R.
在机械系统中，功率可计算为 P = F × v（力 × 速度）。电功率为 P = I × V 或 P = I² × R。
Conservation of energy states that energy cannot be created or destroyed, only converted. Sankey diagrams visualise energy flows and highlight losses, mainly as heat from friction or electrical resistance.
能量守恒定律指出，能量既不能创造也不能消灭，只能转化。桑基图可视化能量流动并突出显示损失，主要损失来自摩擦或电阻产生的热量。
Renewable energy sources (wind, solar, tidal) are crucial for sustainable engineering. Engineers must consider the environmental impact and life-cycle assessment of products from raw material extraction to disposal.
可再生能源（风能、太阳能、潮汐能）对可持续工程至关重要。工程师必须考虑产品的环境影响以及从原材料开采到处置的全生命周期评估。
9. Manufacturing Processes and Quality | 制造工艺与质量
Common manufacturing processes include casting, forming, machining, joining, and additive manufacturing (3D printing). Subtractive processes remove material, while additive processes build parts layer by layer.
常见的制造工艺包括铸造、成形、机加工、连接和增材制造（3D 打印）。减材工艺去除材料，而增材工艺逐层构建零件。
CAD models are converted into CAM toolpaths. CNC machines (milling, turning) can produce components with high precision and repeatability. The choice of process depends on material, quantity, tolerance, and cost.
CAD 模型转换为 CAM 刀具路径。CNC 机床（铣削、车削）可以生产高精度和高重复性的零件。工艺的选择取决于材料、数量、公差和成本。
Quality assurance (QA) covers the entire production process, while quality control (QC) involves inspection and testing of products. Techniques like statistical process control help monitor variation and ensure conformity to specification.
质量保证 (QA) 覆盖整个生产流程，而质量控制 (QC) 涉及产品的检查和测试。统计过程控制等技术有助于监控变异并确保符合规格。
10. Testing, Evaluation, and Fault Finding | 测试、评估与故障查找
Prototypes and final products must be tested against the specification. Tests can assess mechanical properties (tensile, impact), electrical function, durability, and user experience. Data is recorded and analysed to identify areas for improvement.
原型和最终产品必须根据规范进行测试。测试可以评估机械性能（拉伸、冲击）、电气功能、耐久性和用户体验。记录和分析数据以确定改进方向。
Fault finding in electronic circuits often uses a multimeter to measure voltage, resistance, and continuity. A logical approach: visual inspection, then checking power supply, then signal tracing component by component.
电子电路故障查找通常使用万用表测量电压、电阻和导通性。采用逻辑方法：先目视检查，然后检查电源，再逐个元件追踪信号。
In mechanical systems, common faults include misalignment, wear, and excessive vibration. Regular maintenance, lubrication, and condition monitoring prevent breakdowns. Reflective evaluation is an essential part of the engineering cycle.
在机械系统中，常见故障包括不对中、磨损和过度振动。定期维护、润滑和状态监测可防止故障。反思性评估是工程循环中必不可少的一部分。
Published by TutorHao | Engineering Revision Series | aleveler.com
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