Kurzus nemzetközi vendég- és részidős hallgatóknak

Kar

Informatikai Kar

Szervezet

IK-SEK Savaria Műszaki Intézet

Kód

SBANGP204020EN

Cím

Vibrations

Tervezett félév

Tavaszi

Meghirdetve

2023/24/2

ECTS

4

Nyelv

en

Oktatás célja

Students who complete the subject gain knowledge about the basics of vibrating systems. Students will be acquainted with the laws of vibration, and they will be able to describe vibrations, mainly those occurring in engineering practice, and to analyse vibrating systems.

Tantárgy tartalma

Impact. Central impact and oblique impact. Coefficient of restitution, elastic impact, plastic impact. Eccentric impact. Basic concepts of vibrations. Components and categorization of mechanical vibration systems. ONE DEGREE-OF-FREEDOM SYSTEMS Free vibration of undamped systems: the equation of motion, solution, initial conditions. Free vibration of undamped systems: effects of the gravitational force, vibration in vertical direction. Pendula, linearization. Lagrange’s equations of the second kind and their application for one degree-of-freedom systems. Free vibration of damped systems: cases and characteristics of damping. Free vibration of damped systems: viscous damping. Underdamped free vibration, critically damped free vibration, overdamped free vibration. Calculation of damping from measurements. Forced vibrations: cases of excitation. Force excitation, frequency ratio, resonance, magnification factor. Frequency response curves. Forced vibrations: excitation of support, rotating unbalance. Vibration isolation: isolation to protect surroundings, isolation to protect a machine from vibration of its surroundings. MULTIPLE DEGREE-OF-FREEDOM SYSTEMS Lagrange’s equations of the second kind for multiple degree-of-freedom systems. Matrix formulation of equations of motion for linear systems. Free vibration of undamped systems: natural circular frequencies, mode shapes. Solution of equations of motion for unrestrained systems. Free vibration of undamped systems: restrained systems. Free vibration of damped systems. Forced vibrations: forced vibration of undamped systems, forced vibration of damped systems. Vibration absorber, damped vibration absorber.

Számonkérés és értékelés

The conditions for obtaining a signature are: Absences no more than allowed, i.e.: - not more than one hour per week is unverified and - total absences of no more than four hours. Replacement of missed exercises (regardless of whether justified or unverified) by the deadline, in a timely manner, agreed with the teacher (no later than the last day of the semester period). Midterm rules and regulations: students are required to bring their own writing items and clean papers. No borrowing, lending or exchange of any materials is allowed during the tests. Absentees must produce original medical certificates from approved clinics or hospitals. No parents’ letter will be accepted. Students who are absent without valid reason will be given a zero score for that test. A student will be given zero score if he or she is caught cheating during the test. No mobile phones or electronic gadgets that can store, transmit, receive data or information are allowed. Students must not talk, whisper, do hand signals or any other form of verbal or non-verbal communication during the test. Such actions will be considered as having the intention to cheat. Students who are late will not be allowed to write the test or will not be given extra time. Only essential writing materials are allowed on the student’s desk. All bags, books and any unauthorised materials should be left at the front of the classroom. Failure to follow the oral or written instructions may lead to students being penalised. At the first warning, the instructor automatically evaluates the given work at 0%, at a second warning, the instructor refuses to give signature to complete that subject. In addition, the signature is subject to: Writing and preparing the midterm tests at a minimum 50% level calculated in summary. The midterm test written at the prescribed time can be repeated once. On one further occasion – for the improvement of the midterm tests – the subject teacher may, with individual assessment, give special permission for replacement, no later than the end of the week after the semester. A total performance of less than 50% at the end of the week after the semester will result in a refusal to sign. - In the case of attendance education: max. 25-25 points can be scored with the 2 midterm tests. - In the case of online education: with the 2 Moodle papers max. 15-15 points can be scored. - In the case of a changing form of education during the semester: the rules of the methods of accountability that have already taken place and those that are still to be done are published in Moodle. The subject teacher may give additional points for submitting non-mandatory homework assignments or if each midterm test is successful. In the exam period students need to pass the exam on one of the exam days scheduled in NEPTUN. A maximum of 50 points (or 70 points in case of online classes) can be scored on the exam. Students who scored less than 50% in any of the midterm tests must take a written exam about the subject of the corresponding midterm test. If the written exam is successful (at least 50%), then the student can take the oral exam, otherwise the result of the exam is fail. The subject ends with an exam, the condition for admission to the exam is to obtain a signature. The exam grade is established by aggregating the practical work and the result obtained in the exam. The value of the exam grade depending on the overall performance:           0- 49% – fail (1);           50- 62% – pass (2);           63- 74% – satisfactory (3);           75- 86% – good (4);           87-100% – excellent (5).

Irodalomjegyzék

R. C. Hibbeler 2010 Engineering Mechanics. Dynamics Pearson Prentice Hall, USA S. G. Kelly 2011 Mechanical Vibrations. Theory and Applications Cengage Learning

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