Podcast Beta
Questions and Answers
Load case means: all the external loads which have any effect on our product. Task: the ______. Base: theory & practice of product analysis the engineer generally designs products for a certain period of time (planned obsolescence), therefore the load, as a function of time is the most important factor. Gépelemek bevezetés| GÉPELEMEK 1. előadás 18 Different time-dependent load case modells Gépelemek 1. M(t) Terhelés mint idõfüggv. Application examples (for polymer elements): M(t) Idõben változó Idõben állandó M(t) Folyamatosan Változó Szakaszosan változó t -interference fitted ring on a shaft, -reading lamp,clamped -(bolt joints), -intermittent operation of an impeller, M(t) Változó ampl. Állandó amplitúdó t M(t) Rendszertelen Rendszerezett t -rollers, -gears. -programmed, experimental fatigue test M(t) Stacionér t M(t) -real load case, Instacionér [by.Matolcsy Mátyás]
load-modell creation
Second step of the designer: For optimal operation: to determine the maximum allowable stresses & endurance limits of structures & assemblies. To determine in advance. All possible effects & failure modes, fatigue & fracture causes Methodology: e.g. ______
DFMEA (Design Failure Mode and Effect Analysis)
Possible reasons: On loaded mating surfaces it is ______ therefore (eg.: heating, ______, scoring, scuffing), Temperature field effects (eg.: material property change, heat expansion, heat stress), Non-allowable motions ( eg.: vibration, swing), Different substrate, radiation (eg.: corrosion, expansion, aging), Electrical, optical, various property change, Biological degradation, etc.
wear
The failure process can lead us to: Usage value decrease, Needed refurbishment, maintenance, Most dangerous method, the . The ______ is related to stress- and strain state (plastic, ductile, creep, relaxation, stb.) of the material. Remark: in further investigations we use the Hooke’s law as a material modell, but in some cases we can also study the elasto-plastic transition as a boundary condition and also the modells of the fatigue&.
Signup and view all the answers
The third step of the designer: ______. He designs the structure with dimensions and calculates the stress state from the load case and then compare it to endurance limit of given elements and determine whether the construction is good or wrong. endurance limit of structure safety (factor) = stress state of structure safety (factor) = ultimate strength working stress brittle, rigid materials safety (factor) = yield strength working stress ductile materials Endurance limit can mean uselessness for products. eg. Bigger deflection than expected, buckling, indentation, wear, etc.
Signup and view all the answers
Nowadays we have more & more interests to have reality close models and describe more & more reality effects in engineering models. e.g.: cumulative failure theories, operational solidness, ______, e.g. calculation for a so-called surviving possibility function, calculation for fracture, and checking, calculation for elasto-plastic boundary conditions, and further different theories & methods.
Signup and view all the answers
is the process of designing parts, components or products for ease of manufacturing with an end goal of making a better product at a lower cost. This is done by simplifying, optimizing and refining the product design.
Signup and view all the answers
Engineering tasks: to select material according to the requirements list. Materials can be chosen: − cast iron, − steel , − aluminium, − bronze, − polymer, − glass, porcelain, − ______, − wood, paper etc. At first approach: our brain-storming can be guided by the ratio different material properties. (modulus, stress, strain)
Signup and view all the answers
Let’s take a look at. − − − − − − mechanical, ______, electrical, optical, tribological, And other, specific properties. The engineer: to explore the advance material properties and reduce the disadvantageous effects.
Signup and view all the answers
Polymers are. ______: Thermal properties: − density (ρ): app. 1/7, − operation temperature:
Signup and view all the answers
Joints function to transfer forces and torques between ______
Signup and view all the answers
Plumbing elements handle the storage, transfer, and regulation of ______ and gases
Signup and view all the answers
Springs and spring systems store energy and dampen dynamic ______
Signup and view all the answers
Arrangements like bearings and linear guideways facilitate force transfer through mechanical ______
Signup and view all the answers
Drives and drive systems convert power from one form to ______
Signup and view all the answers
Engineers aim to find solutions to technical problems, optimizing various aspects such as material, structure, manufacturing, product-human interface, quality, timing, and ______
Signup and view all the answers
Engineers work in interdisciplinary teams, utilizing various sciences such as mathematics, mechanics, materials, manufacturing, streams, heat, economy, ergonomics, aesthetics, and ______
Signup and view all the answers
Product design often follows the Pahl-Beitz design ______
Signup and view all the answers
Engineers are problem solvers who apply scientific and mathematical principles to create safe, efficient, and cost-effective solutions for ______
Signup and view all the answers
Engineers must consider load cases, stresses, and threshold values when designing ______
Signup and view all the answers
Engineering involves balancing priorities such as quality, timing, and ______
Signup and view all the answers
Manufacturing costs depend on the number of pieces, choice of manufacturing process, and ______
Signup and view all the answers
Machine elements are individual parts of the machine that move and impact other parts to make the machine work. Although a machine element may consist of smaller structural parts, the entire setup that performs the function is considered the ______.
Signup and view all the answers
Gears are rotating parts with interlocking teeth that turn against other gears, causing them to turn and transmit rotational force, or torque. Bearings are used to carry force — an example is the ball bearing, which allows for reduced friction as it rolls freely beneath a moving part. Shafts and couplings, like gears, also transmit torque and are used to connect parts, especially in vehicles such as cars and motorcycles. General-purpose machine elements can be used in any application, and include items such as ______, ______, and ______.
Signup and view all the answers
Nowadays we have more & more interests to have reality close models and describe more & more reality effects in engineering models. e.g.: cumulative failure theories, operational solidness, ______, e.g. calculation for a so-called surviving possibility function, calculation for fracture, and checking, calculation for elasto-plastic boundary conditions, and further different theories & methods.
Signup and view all the answers
Polymers are. ______: Thermal properties: − density (ρ): app. 1/7, − operation temperature:
Signup and view all the answers
Materials can be chosen: − cast iron, − steel , − aluminium, − bronze, − polymer, − glass, porcelain, − ______, − wood, paper etc. At first approach: our brain-storming can be guided by the ratio different material properties. (modulus, stress, strain)
Signup and view all the answers
The third step of the designer: ______. He designs the structure with dimensions and calculates the stress state from the load case and then compare it to endurance limit of given elements and determine whether the construction is good or wrong. endurance limit of structure safety (factor) = stress state of structure safety (factor) = ultimate strength working stress brittle, rigid materials safety (factor) = yield strength working stress ductile materials Endurance limit can mean uselessness for products. eg. Bigger deflection than expected, buckling, indentation, wear, etc.
Signup and view all the answers
Second step of the designer: For optimal operation: to determine the maximum allowable stresses & endurance limits of structures & assemblies. To determine in advance. All possible effects & failure modes, fatigue & fracture causes Methodology: e.g. ______
Signup and view all the answers
Possible reasons: On loaded mating surfaces it is ______ therefore (eg.: heating, ______, scoring, scuffing), Temperature field effects (eg.: material property change, heat expansion, heat stress), Non-allowable motions ( eg.: vibration, swing), Different substrate, radiation (eg.: corrosion, expansion, aging), Electrical, optical, various property change, Biological degradation, etc.
Signup and view all the answers
Let’s take a look at. − − − − − − mechanical, ______, electrical, optical, tribological, And other, specific properties. The engineer: to explore the advance material properties and reduce the disadvantageous effects.
Signup and view all the answers
is the process of designing parts, components or products for ease of manufacturing with an end goal of making a better product at a lower cost. This is done by simplifying, optimizing and refining the product design.
Signup and view all the answers
Study Notes
- Machines consist of various types of elements, including: joints, plumbing elements, springs, arrangements, drives, and complete assemblies.
- Joints function to transfer forces and torques between parts.
- Plumbing elements handle the storage, transfer, and regulation of liquids and gases.
- Springs and spring systems store energy and dampen dynamic systems.
- Arrangements like bearings and linear guideways facilitate force transfer through mechanical movement.
- Drives and drive systems convert power from one form to another.
- Engineers aim to find solutions to technical problems, optimizing various aspects such as material, structure, manufacturing, product-human interface, quality, timing, and costs.
- Engineers work in interdisciplinary teams, utilizing various sciences such as mathematics, mechanics, materials, manufacturing, streams, heat, economy, ergonomics, aesthetics, and marketing.
- Product design often follows the Pahl-Beitz design process.
- Engineers are problem solvers who apply scientific and mathematical principles to create safe, efficient, and cost-effective solutions for society.
- Engineers must consider load cases, stresses, and threshold values when designing structures.
- Engineering involves balancing priorities such as quality, timing, and cost.
- Engineers are part of a quality system to meet customer requirements effectively and efficiently.
- Manufacturing costs depend on the number of pieces, choice of manufacturing process, and tolerances.
- Tight tolerances may require additional processes and inspections or render a part impractical to produce economically.
- Design and development is a technology that requires teamwork, effective communication, and various methodologies.
- Engineers work in effective teams, considering marketing, design, manufacturing, preparation, purchasing, supplier development, management, customer methodology, and ethics.
- Engineers go through a three-step design process, beginning with determining the load case of the structure, followed by identifying the state of stress and stress limits, and finally designing the geometrical structure and dimensions.
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
Related Documents
Description
Test your knowledge of machine elements with this quiz covering mechanical systems, machine parts, and the operation principles of machines. Authors: Dr. Kerényi György Molnár László, Dr. Marosfalvi János, Dr. Horák Péter, & Dr. Baka Ernő.
