Podcast
Questions and Answers
What is the power transmission medium in hydraulic systems?
What is the power transmission medium in hydraulic systems?
- Electricity
- Pneumatic fluid
- Mechanical gears
- Pressurized hydraulic fluid (correct)
What are electrohydraulic (EH) systems controlled by?
What are electrohydraulic (EH) systems controlled by?
- Pneumatic means
- Hydraulic means
- Electrical means (correct)
- Mechanical means
What are hydro-mechanical systems controlled by?
What are hydro-mechanical systems controlled by?
- Pneumatic means
- Hydraulic means
- A combination of mechanical and hydraulic mechanisms (correct)
- Electrical means
What is the main component for controlling the flow into the actuator in an EH system?
What is the main component for controlling the flow into the actuator in an EH system?
What generates the command signal to the electronic control module (ECM) in electronically controlled hydraulic systems?
What generates the command signal to the electronic control module (ECM) in electronically controlled hydraulic systems?
What is the function of the electronic control module (ECM) in EH systems?
What is the function of the electronic control module (ECM) in EH systems?
What is the function of proportional flow control valves in hydraulic systems?
What is the function of proportional flow control valves in hydraulic systems?
What is the typical volumetric size of the reservoir compared to the flow rate of the pump in a hydraulic power supply unit?
What is the typical volumetric size of the reservoir compared to the flow rate of the pump in a hydraulic power supply unit?
What are the common power sources for hydraulic pump in industrial and mobile equipment applications?
What are the common power sources for hydraulic pump in industrial and mobile equipment applications?
Which type of design includes JIC style and overhead design for hydraulic power units?
Which type of design includes JIC style and overhead design for hydraulic power units?
What must engineers understand about hydraulic components and their symbolic representations?
What must engineers understand about hydraulic components and their symbolic representations?
What are the applications of hydraulic motion control systems?
What are the applications of hydraulic motion control systems?
What type of valves are used for applications requiring controlled flow to be turned ON or OFF?
What type of valves are used for applications requiring controlled flow to be turned ON or OFF?
What is the primary function of safety relief valves in hydraulic circuits?
What is the primary function of safety relief valves in hydraulic circuits?
Which valves can achieve a finite number of desired speed or force control levels at a lower cost and with simpler design?
Which valves can achieve a finite number of desired speed or force control levels at a lower cost and with simpler design?
What is a characteristic of ON/OFF valves in discrete speed or flow rate control applications?
What is a characteristic of ON/OFF valves in discrete speed or flow rate control applications?
What can be used in real-time as part of a closed loop control algorithm in hydraulic systems?
What can be used in real-time as part of a closed loop control algorithm in hydraulic systems?
What do EH control systems operate to track and can be used in hydraulic motion systems for safety-related additions?
What do EH control systems operate to track and can be used in hydraulic motion systems for safety-related additions?
What are the main components to be identified in a hydraulic circuit diagram?
What are the main components to be identified in a hydraulic circuit diagram?
What are the types of command signal sources in a hydraulic system?
What are the types of command signal sources in a hydraulic system?
What are the steps involved in the design of an electro-hydraulic motion control system?
What are the steps involved in the design of an electro-hydraulic motion control system?
What can be used as measured variables in an electro-hydraulic (EH) system for control purposes?
What can be used as measured variables in an electro-hydraulic (EH) system for control purposes?
What types of variables can be derived from the measured variables in an EH system and regulated?
What types of variables can be derived from the measured variables in an EH system and regulated?
What kind of logic should be identified and studied in hydro-mechanical built-in priority and over-ride type logic, as well as control logic software?
What kind of logic should be identified and studied in hydro-mechanical built-in priority and over-ride type logic, as well as control logic software?
What is the hydraulic analogy of an electrical system battery or capacitor?
What is the hydraulic analogy of an electrical system battery or capacitor?
Which component reduces the open loop natural frequency of the EH system?
Which component reduces the open loop natural frequency of the EH system?
What is the purpose of parallel bypass valves in hydraulic filters?
What is the purpose of parallel bypass valves in hydraulic filters?
What type of control is used in the electrohydraulic circuit for the motion of a rotary hydraulic motor for a service truck?
What type of control is used in the electrohydraulic circuit for the motion of a rotary hydraulic motor for a service truck?
In a simple hydraulic system utilizing lever motion for hydraulic power, what is the function of check valves in fluid movement?
In a simple hydraulic system utilizing lever motion for hydraulic power, what is the function of check valves in fluid movement?
What is the function of the fixed displacement gear type pump in a hydraulic system?
What is the function of the fixed displacement gear type pump in a hydraulic system?
Flashcards
Accumulator
Accumulator
A hydraulic component that stores pressurized fluid, acting like a battery in an electrical system.
Hydro-pneumatic accumulator
Hydro-pneumatic accumulator
A type of accumulator that uses compressed nitrogen gas to store hydraulic fluid.
Compression ratio
Compression ratio
The ratio between the maximum and minimum operating pressure of an accumulator.
Check valve
Check valve
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Directional valve
Directional valve
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Flow control valve
Flow control valve
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Tachometer speed sensor
Tachometer speed sensor
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Fixed displacement pump
Fixed displacement pump
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Open-center valve
Open-center valve
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Open-loop system
Open-loop system
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Closed-loop system
Closed-loop system
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Hydraulic cylinder
Hydraulic cylinder
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Hydraulic motor
Hydraulic motor
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Hydraulic system
Hydraulic system
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Conservation of power
Conservation of power
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Hydraulic filter
Hydraulic filter
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Bypass valve
Bypass valve
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Check valve
Check valve
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Directional valve
Directional valve
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Flow control valve
Flow control valve
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Tachometer speed sensor
Tachometer speed sensor
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Fixed displacement pump
Fixed displacement pump
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Open-center valve
Open-center valve
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Open-loop system
Open-loop system
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Closed-loop system
Closed-loop system
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Hydraulic cylinder
Hydraulic cylinder
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Hydraulic motor
Hydraulic motor
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Hydraulic system
Hydraulic system
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Conservation of power
Conservation of power
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Study Notes
Hydraulic System Components and Concepts
- ON/OFF valves can operate in three different speed ranges by controlling both or either one of the valves, providing simple and low-cost motion control solutions for discrete speed or flow rate control applications.
- The accumulator, which is the hydraulic analogy of an electrical system battery or capacitor, serves as a pressurized fluid storage component and aids in transient response and shock absorption.
- Accumulators reduce the open loop natural frequency of the EH system and are available in weight loaded, spring loaded, and hydro-pneumatic types, with the latter utilizing dry nitrogen as the compressed gas.
- Accumulators are rated based on hydraulic fluid volume, maximum and minimum operating pressures, precharge pressure, and maximum shock pressure they can tolerate, with the compression ratio representing the ratio between maximum and minimum operating pressure.
- Filtration is crucial in removing solid particles from hydraulic fluid, with filters located at different points in the system and replaceable elements to remove particles above a certain size, such as 3-micron.
- Filters have parallel bypass valves as a safety measure in case of clogging due to excessive dirt accumulation, which can lead to unfiltered fluid causing component failure.
- Specifications for a filter include the minimum size of particles it can filter, maximum pressure it can withstand, and maximum flow rate it can support.
- A simple hydraulic system utilizing lever motion for hydraulic power is shown, illustrating the conservation of power and the function of check valves in fluid movement.
- Another simple hydraulic system with a fixed displacement gear type pump and a manually actuated open-center valve is depicted, with the valve circulating flow from the pump port to tank port in the neutral position.
- Components of a hydraulic circuit for the motion of a cylinder in an excavator, powered by an internal combustion engine and controlled by a manually operated directional valve, are illustrated.
- An electrohydraulic circuit for the motion of a rotary hydraulic motor for a service truck, with speed control through a directional flow control valve and operator input switch, is shown, featuring closed-loop speed control using a tachometer speed sensor as feedback.
- Hydraulic circuits play a crucial role in various applications, from simple lever-operated systems to complex electrohydraulic systems in heavy machinery and equipment.
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Description
Test your knowledge of hydraulic system components and concepts with this quiz. Explore ON/OFF valves, accumulators, filtration, and different types of hydraulic circuits, from simple lever-operated systems to complex electrohydraulic systems in heavy machinery and equipment.
