Notes, summaries, assignments, exams, and problems for Technology

Automation and Control Systems

The main elements of a structure, motor circuits, actuators, control devices, regulatory, and other control mechanisms are often referred to as having an authoritarian system of automation and control.

Types of Automated Machines

Machines can be classified according to:

• Technology Involved: They can be electric, mechanical, etc.
• Complexity: Based on the number of pieces they comprise.
• Level of Automation: How dependent they are on human intervention.

Based on the level of automation, they can be:

• Machines Without Automation

  Control is done manually.

• Fixed Cycle Automatic Machines

  Concrete operations are repeated over and over again in the same way. Modification is needed to change the cycle.

• Programmable Machines

  Similar to

Project Methodology

1. Identifying and Defining the Problem: Before solving the problem, it is important to analyze the situation to accurately detect it.
2. Investigate and Seek Information: Sometimes the problem can be solved using knowledge and imagination, but on other occasions, it will be necessary to investigate how to find information on different sources (books, magazines, internet, etc.) to solve it.
3. Find Possible Solutions: A way of doing this is by brainstorming. All group members share their ideas for some time.
4. Choice of Solution: To choose the solution that solves the problem in the easiest, safest, and most economical way.
5. Design: For this, the first sketches are made of what is to be built. These plans should contain all the design details

Electronic Components & Electrical Materials

Resistors: Types and Characteristics

Understanding Electrical Resistance

Resistance is the property of a material that hinders the passage of electric current through it.

Ohmic Resistance Explained

Ohmic resistance refers to the resistance of materials where the current is directly proportional to the voltage across them, following Ohm's Law.

Fixed Resistors: Construction & Use

A fixed resistor typically comprises a cylindrical insulating support on which a layer of resistive material, often pulverized charcoal mixed with binder substances, is deposited.

Variable Resistors: Potentiometers & More

A variable resistor, such as a potentiometer, has an ohmic value that varies within certain limits... Continue reading "Electronic Components and Electrical Materials Explained" »

Elementos de la Placa Base

La motherboard o placa base está diseñada para acomodar diferentes microprocesadores de Intel y AMD. Los elementos actualmente incluidos en la placa base son:

• Chipset
• Zócalo para microprocesador
• Zócalo para memoria RAM
• Memoria caché (incluida en el microprocesador)
• Conectores de alimentación, panel y altavoz
• Ranuras o slots de expansión
• Puertos serie, paralelo, USB y conectores de teclado y ratón
• Reloj, ROM-BIOS-CMOS y batería
• Jumpers o interruptores
• Controladores de unidades de disquete, disco duro, SATA y controladoras SCSI (muy pocas)
• Controladora de sonido, controladora gráfica (en la mayoría)
• Controladora de red local y módem

Existe una constante de frecuencia de incremento de trabajo, y se incorporan elementos... Continue reading "Componentes y Arquitectura de la Placa Base" »

The Mechanisms Explained

Mechanisms are essential components designed to transmit and transform energy and movement from a driving force to a receiver element. They allow humans to perform tasks with greater comfort and less effort.

Mechanisms are classified into:

• Transmission mechanisms of motion (linear or circular transmission).
• Mechanisms of transformation of movement (rectilinear to circular, or circular to rectilinear).

Lever

A lever is in equilibrium when the product of the applied force (F) and its distance from the fulcrum (d) equals the product of the resistance (R) and its distance from the fulcrum (r).

Formula: F · d = R · r

Types of Levers:

• First Class: The fulcrum is positioned between the applied force and the resistance.
• Second Class:

Programmable Logic Controllers (PLCs) Explained

A Programmable Logic Controller (PLC) is an electronic device capable of processing analog, digital, numeric, and alphanumeric information. It is designed to monitor real-time automated industrial processes. Basically, a PLC consists of a control unit, memory, and input/output modules. PLC manufacturers establish communication with external circuits. These circuits are constituted by sensors that send information from the industrial process to the PLC, and actuators that implement program orders.

Automation Approaches: Wired vs. Programmed

Wired Automation Limitations

Traditional wired automation presents several challenges:

• Requires large conduits and control panels.
• Lacks flexibility; variations do

BT06 Bare Conductors Specifications

Breaking Load:

410 daN

Braces and Struts:

1400 daN

Ultimate Safety Factor

• Metallic: 1.5
• Reinforced Concrete: 2.5
• Wood: 3.5
• Non-metallic: 2.5

1. Isolated Conductors

• Cables Perched

  • Distance from floor: 2.5m
  • Windows: 0.3m top, 0.5m bottom and sides
  • Balconies: 0.3m top and bottom, 1m sides

• Tension Cables

  • Ground distance: 4m
  • Mechanical strength: 800 daN

2. Bare Conductors

• Distance from ground: 4m

• On the Roof

  • Flat parallel: 1.8m if connected to ground, 1.50m otherwise
  • With inclination of 45 degrees: can be reduced to 1m

• Terraces and Balconies

  • Flat parallel: 3m

• Facades

  Protection zone limited to:

  • Plane parallel to the wall at 1m from windows or balconies, further limited by:
    • Plane parallel horizontal top: 0.30m
    • 2 vertical planes, one on each

Simple Machines: Fundamentals of Mechanics

Simple machines are fundamental mechanisms. They are characterized by the exchange of mechanical work (involving some of their moving elements), and all their solid parts are rigid.

Levers: Principles and Classes

A lever is a simple machine formed by a rigid bar that can turn around a support point, known as the fulcrum. In all levers, there is a point where the body to be moved is placed, which we call resistance, and another point where force is applied to move the load, which we call power or effort. The distances from the fulcrum to the application points of the load and power are called arms.

Types of Levers Explained

1. First Class Levers: The fulcrum is located between the load and the applied force

Crystal Defects and Casting Faults

Crystal defects and imperfections occur during casting, resulting in volume changes and fissures. Rapid cooling produces larger grains that resist traction and increase hardness. Regarding porosity, types such as FN (effervescent), FV (unfit/fit), and calm FF are commonly used.

Physical and Mechanical Characteristics

Metals typically have a density of 7-9 g/cm³. They act as thermal conductors where Q = (t₁ - t₂) S / y and exhibit dilatation defined by ΔL = α · Δt · L₀. They are effective transmitters of sound and are weldable with or without filler material, under pressure, or both. In a plastic state, they are heat resistant and electrically conductive.

Mechanical Properties and Hardness Testing

Properties... Continue reading "Metallurgy Fundamentals: Steelmaking and Metal Properties" »

Fundamental Electronic Components and Measurement

Resistors: Function and Characteristics

Resistors are components that offer opposition to the passage or circulation of electric current, causing a potential voltage drop across their terminals. Key characteristics include:

• Ohmic resistance magnitude and tolerance (limiting deviations established by the manufacturer).
• Power rating (the maximum power the resistor can safely dissipate).

Resistors must operate under stable conditions.

Types of Resistors

Fixed Resistors

These components maintain a constant ohmic value and typically have two terminals. Their resistance value is often obtained by modifying carbon layers using a spiral cut that forces the electric current to follow a specific, calculated path.... Continue reading "Essential Electronic Components and Circuit Measurement" »