Course detail
Earth Working Machinery
FSI-QZE Acad. year: 2024/2025 Summer semester
The course is to acquaint students with the technology of road construction and machinery used in their construction as a machine for plating, compaction mechanisms, machines for construction of concrete and asphalt roads and their construction design.
Supervisor
Department
Learning outcomes of the course unit
Prerequisites
Successful completion of the course is conditional on the basic knowledge of technical mechanics, physics and higher mathematics.
Planned learning activities and teaching methods
Assesment methods and criteria linked to learning outcomes
Classification and assessment of the student credit: Excellent (90-100 points), very good (80-89 points), good (70-79 points), satisfactory (60-69 points), sufficient (50-59 points), failed (0-49 points).
Course-unit credit is awarded on condition of having attended the exercises actively and worked out assigned projects. Presence in the exercises is obligatory.
Language of instruction
Czech
Aims
The aim and task of the course is to acquaint students with the design layout and main technical parameters of compaction machinery, construction machinery for asphalt and concrete roads, machinery for the repair of roads and automation of machinery for road construction. Acquainted with the principles of design and planning in respect of technology and technical requirements.
Students will be able to choose the concept of meeting the technological and technical equipment requirements, specify the main components and machine projection addressed. It is able to propose optimal technological assembly machinery to build roads on the basis of their technical parameters and options.
Specification of controlled education, way of implementation and compensation for absences
The study programmes with the given course
Programme N-ADI-P: Automotive and Material Handling Engineering, Master's
branch ---: no specialisation, 3 credits, compulsory-optional
Programme C-AKR-P: , Lifelong learning
branch CLS: , 3 credits, elective
Type of course unit
Lecture
39 hours, optionally
Syllabus
1. Technology of the earth work, classification of the earthmoving machines.
2. Main assembly groups of the machines.
3. Technical properties of a soil.
4. Methods of a soil disintegration and their energy demands.
5. Modeling of soil uncoupling with a working tool and numerical simulation of the solution using DEM analyses.
6. Force effects between the soil and tool.
7. Engine devices of the earthmoving machines, determination of an engine power.
8. Hydrostatic system, hydrodynamic system.
9. Hydraulic system of the earthmoving machines.
10.Chassis of the earthmoving machines.
11. Transmission of the forces between the earthmoving machine chassis and soil.
12. Hydrostatic servo-mechanism of the earthmoving machines.
13. Brake system of the earthmoving machines, cooling system of the earthmoving machines.
Exercise
13 hours, compulsory
Syllabus
1. Technical assignment and development of the wheel loader.
2. Determination of the climatic variant marking of the multipurpose front loader for an area of the expected purpose.
3. Determination of the technical properties of a soil.
4. Calculation of the working machines resistances.
5. Modelling of soil disconnection with a working tool (shovel) using Altair's EDEM software.
6. Modelling of soil disconnection with a working tool (dozer ripper) using Altair's EDEM software.
7. Evaluation of the cooperation between combustion engine and moment converter and calculation of the moving forces and machine speed. Evaluation of an earthmoving machine engine power.
8. Design of the hydraulic generators for the working hydraulic circuits.
9. Calculation of the joint loading bearings of the wheel loader chassis.
10. Calculation of the steering moment and speed-torque characteristic of the wheel loader with the joint frame.
11. Calculation of the movement resistances of the tracked chassis of the excavator. Design of a hydraulic generator for the servo-mechanism circuit.
12. Calculation of the loader brakes.
13. Calculation of the loss and heat formation in circuit of the working hydraulics and servo-mechanism, evaluation of the hydraulic circuit cooling of an earthmoving machine.