Questions related to Design Engineering
Dear Ehsan, hi!
I read a work done by your team on flameless combustion and it is very interesting. I work in a steel company in Sweden, where our furnaces are equipped with flameless oxyfuel. I need to calculate the recirculation factor for this type (for my next publication).
My question is how the formulation in your paper applies to oxy-propane flames? Can you help me with this?
Thank you in advanced
Since there are materials having high yield strength and good mechanical properties but due to less ductility their usage is limited to only very few applications.
I got this http://thedesignenginnering.com link through some friend. I didn't know that it was fake. I had submitted my paper. They have published it. But they aren't sharing me the full copy PDF. Just at this point, I realized that this is a fake one. I contacted the journal team by email. No response. How do I get it? Our research office will usually ask us to submit the full paper PDF for verification? Can anyone suggest me how to receive the full paper PDF?
An aircraft hanger has a semi-circular cross section of diameter 50m and its longitudinal axis is perpendicular to the prevailing wind direction. Assuming that the flow over the hanger is two dimensional and the wind has no viscosity, estimate the tensile force per unit length on the hanger when the wind speed is 30 m/s.
I have no idea how to begin or attempt this question. The only thing I do know is the the Pressure coefficient is given as
(p - p')/(rho*u2/2) = 1 - 4 sin2(theta)
and when this equation is plotted against angle, it has a maximum value of 1 and minimum value of -3.
any tips ?
I am teaching a course on manual limit analyses (yield line theories and Hillerborg's strip method) for reinforced concrete structures. I am not sure whether they are being used in practice (by design engineers) as nonlinear FEA seems to prevail.
I am working as a product design engineer for over 5 years. In my career, I have designed many products like electronics product housing, sheet metal structures, and assembly parts with plastic and sheet metals. In the time of simulation frequently, I had to put numerous data manually and perform many repetitive tasks to acquire optimum results. I want to perform these tasks through machine learning algorithms. I am learning ML. Now I need some help to learn the tips and tricks as well as some guidelines to reach my goal.
Thanks in advance.
As we know in this epidemic, everything seems difficult to control. which research I hope can discuss and share their research ideas at this time. Especially with regard to product design and mechanical innovation design
In addition, what are the innovative design methods for products? (except TRIZ,QFD,C-K theory)？
What product innovation design theory can be combined with TRIZ in addition to the combination of QFD theory and TRIZ theory?
I designed a vehicle model and when runing, an error message appear which:" Algebraic state in algebraic loop containing '....../Product23' computed at time 0 is Inf or NaN. There may be a singularity in the solution. If the model is correct, try reducing the step size (either by reducing the fixed step size or by tightening the error tolerances). i tried to reduce the fixed step size but it appears again, please help me to correct this error.thanks.
Researchers experiment with individual and group of designers. In 'engineering design' what are pros and cons (in general) for doing experiment with two designers in a group? By engineering design, I mean a design problem based on mechanical, industrial design etc. By solution, I mean concept generation.
Salam & Hello everyone,
I have designed a new survey on a topic of product designs ownership during COVID-19 for my latest postdoctoral project. I need your help to answer the survey.
Main Title: The ownership of nature-inspired product designs during COVID-19
Sub-topics:THE PURPOSE, OWNERSHIP AND USAGE OF PRODUCT DESIGNS AND PRODUCT EMBEDDED WITH LIVING ORGANISMS IN THE GLOBAL COVID-19 PANDEMIC
OBJECTIVES OF RESEARCH
The main purpose of this study is to find out the perception and preferences of potential users in regards to product designs and product embedded with living organisms during COVID-19/ lockdown (or any similar situation in the future). Moreover, this study also looking into consumers purchasing behaviour during COVID-19/ lockdown to see whether their purchasing decisions are affected during the pandemic.
The survey consisted of 4 main sections:
A. Respondent background
B. Nature and its connectedness during the global Covid-19/ lockdown
C. The purpose and ownership of product embedded with living organisms during COVID-19/ lockdown
D. The ownership of product designs during COVID-19/ lockdown
This survey will be expected to be completed in less 20 minutes. Thank you in advance for participating.
Ayn Sayuti, PhD
Postdoctoral Visiting Researcher,
Design Products/ Innovation Design Engineering,
School of Design,
Royal College of Art, London
Having surfed the Net, I saw some yardsticks based on which the maximum differential settlement was limited to 50 mm, e.g., Skempton and McDonald (1956). Are there any codes or research studies, letting the design engineers pick a much higher value?
Just to find out in which gear had I driven the vehicle for my trail or drive. During my drive I will record Engine Speed (RPM) and Vehicle Speed (km/h).
With a light RolliT Robot you can compact and smooth or broom finish the surface. And you can use ordinary concrete mix and air additive in the mix. We have done many parking decks and bridges with this method
Please visit www.rollit.se
Research strategies in many institutions require to carefully investigating the future trends in disciplines. Other plans such as hiring researchers, establishing new labs, … are based on the how we look to the future of research and our understanding what others working in. I hope that researchers discuss this important issue and exchange the related experiences and knowledge.
As part of an ongoing Masters degree currently being undertaken at the Waterford Institute of Technology. We are seeking insight into the critical success factors in construction that could drive successful commissioning of a major project in Ireland. Can i get professionals (PM,Commissioners,Designers, ,Engineers,etc.) in the construction industry to participate in our survey in other to generate result for the research?
Kindly click the link below to participate in the survey that will take just 5- 6 minutes.Thank
As shown in illustration, I have a pipe with details listed below and it is clamped at both ends. Clamps are tightened by applying a torque of 15Nm. How could i find out if the support provided between the clamps, in this case a U bolt supporting at a length from one end of Clamp would be sufficient under 1G loading condition.
Total length of pipe = 4 meters
Wall thickness = 1.5mm
Total mass of pipe = 5 kg
Thank you all folks out here..
Appreciate your help.
What are the advantages of having closed-form solution of a performance matrix than its integral representation for a wireless communication system design engineer?
It is well known that KIC is a measure of materials property (intrinsic) is called a fracture toughness, while the KIFR according to ISO 14627 (2012) is defined as a resistance to cracking as introduced by an indenter and has correlations with wear resistance.
My question is:
if a design engineer were to use a fracture parameter to design a component with, which would he/she choose?
You have a cylindrical structure that you want to preserve under impact loading (the force below which the cylindrical structure stays intact is 5kN). How do you design another energy absorbing structure to put between the impactor (which generates a force of 25kN) and the cylindrical structure to make sure that the later stays intact?
I have seen many models and frameworks; from user journey to service design models. Is there a book on how to design descriptive prescriptive models (from the design process)? Are there certain principles; or is it totally intuitive?
while delphi methods tends to be an old-fashioned methodology; comes to an end through diverse questionnaires and analysing methods.
is there a real example of doing delphi in "design" field? would you share your surveys and results?
Many proposals are made (by visionaries and/or academic researchers) about what good design should be (e.g. the cradle-to-cradle manifesto within sustainability), how to do design research (e.g. context mapping), or of tools to help designers. In practice they are often applied in simplified, streamlined or even dogmatic ways. Has anyone studied the potential of anticipating the future applications by professionals (and amateurs), that may not have full expertise of a philosophy, method or tool? Could mis-use and mis-application be prevented by anticipating this inevitable phenomenon?
My questions are pertaining to design of semi-rigid barrier (w-beam type & thrie type) for :
case-I Normal Containment as per IRC(i.e. vehicle mass=15KN and velocity at impact=110kmph and 20 degree angle of impact)
Case-II High Containment (i.e. vehicle mass=300KN and velocity at impact=60kmph and 20 degree angle of impact)
(1). What shall be the stiffness of the vehicle and stiffness of the barrier considering W-beam and thrie beam barriers and how the stiffness varies? (2) How many posts shall be taken into consideration as being effective in successful countering the vehicle crash?
(3) What is the height of impact?
I have to realize a prototype of a patented invention of sea water dessalination using solar radiation. The performance of the engine increase when water move in small spaces. I need to know what is the limit to consider that we have conditions of nano scale in fluids flow. I need also a good reference to assess the fluid motion at the nano scale and eventually a suitable software tool,
Samir Touzani - Inventor
I am in need of consultation sources on virtual reality technology applications in the product design development, especially in the preliminary design stage and more precisely in relation to the mechanical parts assembly, ie how to make the parts collide during assembly virtual.
Actually i am working on a project about mechaniques of glass wool. I have to see the details of mechanical properties at the junction of fibers.
I think there is a problem regarding shrinkage of concrete
Laplace law was used to calculate pressure based on fabric tension and radius of curvature. It is known that most previous studies are referring to limbs area which is have cylindrical shape. However, the concave and convex areas such as facial contour does not have the cylindrical shape and the gap exists when applying head garment. Can the calculation still be applied at this area?
I need to model a reinforced concrete connection in which there are some plates, reinforcement bars, and concrete. I just would like to know how to model concrete with embedded reinforcement bars and a steel plate on it.
Incinerator, Design, Procedures, Heat Transfer, Thermodynamics, Mechanics of Machines, Fluid Mechanics, CAD
My team and I have been assigned to produce a layout of a production line of a manufacturing company by using WITNESS 14. The layout of the production line has been done. However, we are currently having problem to allocate the labour to take the parts from the shelf and move it to the machines. We have been told that it required some coding to control the action of the labour. Enclosed is the layout of the production line we drawn for this project.
Thanks for the reply.
Hi. I'm trying to model interfacial delamination, where the cohesion at the interface is reduced due to temperature. I have defined the damage initiation criteria in terms of maximum stress and it works fine. When I try use temperature dependent data for the maximum stress criterion the results show that the temperature is not taken into account. What could cause this? I am using tie constraints for the cohesive layer.
I have gone through processes such as ATRP , but I still could not figure out how ethylene monomers could grown on the surface of inorganic particles such as SiC , Si3N4 , TiO2 etc.
For designing heat exchangers in Boiler economizers and other applications, overall heat transfer coefficient plays a determining role to find out the heating surface of economizers.What is the standard value from range of 20 to 300 for finding out the heating surface for low temperature zone of flue gas path.
Boiler design Engineers and Chemical Engineers with specialization in heat transfer can answer this question.
Researchers of computer science and software engineering committed huge mistake, such mistake was not committed by researchers of any other scientific or engineering field for past 2000 years. The mistake is: Evolving a complex paradigm of computer science and software engineering for nearly 45 years that resulted in a huge body of knowledge, which is rooted in flawed 48 years old hidden beliefs. Only other example I could find is geocentric paradigm that evolved for 1600 years (rooted in flawed belief “the Earth is static”) and was replaced by heliocentric model nearly 400 years ago.
It is a monumental mistake to have undocumented or unproven beliefs (or assumptions) at the root (i.e. core) of any body of knowledge of any scientific or engineering discipline. The scientific rules (i.e. processes and principles) were created during the first greatest scientific revolution (i.e. when error at the root of geocentric paradigm was exposed by enduring huge pain and suffering) and the rules has been refined over the centuries to avoid repeating of such kind of shocking mistake again at any cost. Of course, researchers may rely on documented beliefs (or assumptions) for proposing hypothesis to investigate or explore scientific or technological frontiers to discover new facts to expand the body of knowledge, but it is a blatant violation of the scientific process to not documenting any such belief as an assumption.
Likewise, even a fact (i.e. widely accepted to be self-evident) must be treated as an assumption, until it is proven by documented proof backed by evidence. The proof must be clearly documented and publicly available, so that the proof can be falsified (e.g. any time in the future as technology advances over time), if and when new demonstrable anomaly or contradicting evidence is surfaces or discovered. We all know what happened when mankind relied on a belief “the Earth is static” by considering it to be a self-evident fact. Researchers of no scientific or engineering discipline can afford to repeat such monumental mistake again and again.
Unfortunately, few experts confuse between these two completely different kind of beliefs or assumptions (1) having (or relying) on documented beliefs or assumptions in (or by) a hypothesis for exploring un-chartered frontiers for expanding the boundaries of body of knowledge, and (2) having and relying on undocumented or unproven beliefs at the very core or root of a mature body of knowledge, which has been evolving for decades or even centuries (e.g. by considering the unproven beliefs to be self-evident facts). It is foolish to justify the second kind of beliefs by referring to the first kind of beliefs.
Relying on documented beliefs for exploring new un-chartered frontiers is not a violation – it is a proven method for research. But having or relying on undocumented or unproven beliefs at the very core/root and as a foundation of a mature body of knowledge makes the whole body of knowledge flawed and invalid. For example, the whole geocentric paradigm that evolved for 1800 years ended up invalid. Likewise, existing paradigm for CBSD that has been evolving for decades end up useless for achieving real CBD for software products, if the beliefs at its root or core are flawed.
The basic rules (e.g. processes and principles) for any kind of research to advance any scientific or engineering discipline are devised to prevent this kind of mistake at any cost. The researchers of computer science and software engineering violated even such basic common sense rules by relying on undocumented and unproven (or untested) beliefs, when defining nature and properties for so called software components for CBSD (Component Based Design for Software products).
The definitions for so called software components or many concepts or aspects of existing CBSD has no basis in reality. But in fact those definitions and concepts are in clear contradiction to the facts and reality we know about the physical components that are capable of achieving the CBD of physical products. For example, almost every expert readily admits the facts that the nature and properties of so called software components are in clear contradiction to the reality. If the beliefs (that lead to such contradictory definitions or concepts) are documented, what are those beliefs? If those 45 years old beliefs are facts, where can I find the proof (e.g. to investigate if the proof can be falsified using latest 21st century knowledge and tools)?
There are many unproven and undocumented beliefs at the root of software engineering, such as: (i) Many software experts give baseless excuses such as software is different or unique, or (ii) believe that it is impossible to invent real-software-components for achieving real CBD for software, which is equivalent to the CBD of physical products. Is there any proof that it is impossible to achieve such real CBSD? It is impossible to find, if any one ever even tried to verify such baseless beliefs.
I can demonstrate proof that it is possible to achieve such real CBD for software applications or products. In light of this kind of evidence and examples, it is impossible to find a valid reason, why software products can’t be designed as engineers design and build large one-of-a-kind physical products such as an experimental spacecraft or prototype of a next generation fighter-jet (completely free from spaghetti design/code).
I need to cool 50 L water that is in the cylinder from 27 to about 7 degrees centigrade with R717 (refrigerant) using a refrigeration cycle includes compressor, condenser and evaporator.
However, I need to know the proper evaporator size and suitable compressor power and refrigerant type.
Some academics as well as authors shows TRIZ as the best ideation tool for engineering tasks. But, as I saw by a survey, most of design engineers applies mostly Brainstorming. What do you think?
I need to design a push to open mechanism for small drawer. Drawer has to come out slowly and completely, once we push it. Please suggest me appropriate and less costly mechanism.
I'm making a thesis for my university about point measurement in 3D space, and i need to find a sensor which have a signal emiter and a detector. The detector is inside divice that measures the x,y,z parameters due to singnal emiter localization and according to that it give me the parameter of the measured point. For all help i will be very grateful
Dear friends in the similar field: Happy new year and all the best wishes for you! Can anyone suggest papers about built Motor for skylaunch?
THANK YOU VERY MUCH!
Methods based on functional decomposition and morphology belong to the so called systematic design methodology. They are widely taught in accademia, but their diffusion in industry has not reached the same success. Some hypothesis have been formulated by literature, but it is still not possible to identify concrete reasons.
What do you think about that?
I don't understand how people are making a BLDC Motor with 95% to 97% efficient. I myself is a Motor Design Engineer and i use my own Excel calculations for designing various BLDC Motors. Even i use Ansys Software for designing the Motor. But the maximum efficiency i got while designing the Motor in Ansys was 90% and the Motor was an Outrunner. For Inrunner, i could go up to 87%. But when i go through different papers on internet, i see the efficiency of all motors to be around 96% to 97%. I don't know how people are achieving it. Do they actually get that efficiency in practical?
My Motor practical efficiency was 85.4% (Full load) only even it was showing around 90% in Ansys software.
Now can anyone tell me where did i go wrong? And please if anyone has practical Motor designing experience then please tell me how i can design a BLDC Motor with atleast 95% efficiency in Ansys or any other softwares such as Speed or Motorcad? And how to get that same efficiency when the Motor is made practically?
I am building an lab apparatus. It will measure oscillating water in a tank mounted on two single axis small load cells of 40 KG. The problem is- the load cells I am using have only one mounting hole at each side which are not threaded and no matter how tightly I bolt them, the bolts become loose and the tank above rotates as the water sloshes.
There are several possible ways to prevent the rotation. But if anyone have any previous experience, it would be great to know that. Please help me with some good ways to mount them.
Please provide any information on the maximum diameter of glass fibre reinforced epoxy (GRE) tank /glass fibre reinforced plastic composite tank available in the market.
What is the technical difficulty or is there any barrier to produce glass fibre reinforced epoxy (GRE) tank /glass fibre reinforced plastic composite tank in very large diameter, for example 50 meters in diameter?
I have simulated 2D deep drawing process using Abaqus software. I got the result for deformed cup output.In the output contour result, the maximum value of PEEQ is indicated in the Die corner Radius portion and the thinning is maximum at the Punch corner radius. I referred many journals in that the maximum PEEQ value is occurred in the maximum thinning area. But I got the results in different way,what is the exact solution for this.If there is any chance for error in my simulation.Please give your valuable suggestions.
PDMS the film breaks while peeling from the mold after curing
Pattern is checked lines, spacing 200 micron to their adjacent lines using CO2 laser on a PMMA plate of 5mm thickness
The cross section of the mold is shown is the picture with the thickness of the mold cavity
What is the difference between pressure and articulation angles in roller-chains? Also, I assume articulation angle becomes larger for larger gear ratios, does this mean that it is related to the wrap angle?
I am trying to calculate the efficiency of a roller chain and I need to be able to calculate articulation angles properly
As Shown in attachment,spherical ball is rotating about inclined axis and whole assembly is rotating about vertical axis.In ANSYS 15 -workbench CFX module, I assigned two different domains,one for whole assembly and one for only sphere,but in solution it is giving error of more than one boundary condition. Please help me to specify the boundary conditions.
I am simulating Single point incremental forming on Abaqus CAE. Analysis completes successfully but i am not getting any plastic deformation on sheet.
I gave an absurd value of 4mm depth of cut just to see what happens and still the sheet only undergoes elastic deformation.
Warning: THE YIELD STRESS RATIOS GIVEN DEFINE NON POSITIVE CONSTANTS FOR HILL'S STRESS FUNCTION.
Please suggest relevant changes. Thank you in advance.
What degree of freedom shall be applied on the nodes at the intersection of beam-to-column joint. Is it UX UY UZ (i.e all DOF = 0, completely restrained) or something else. I'm modelling A beam-to-column joint in ANSYS mechanical APDL 14.5. Beam and column both are I sections.
So at the intersection of beam to column, DOF shall be what?
at lower strain (elastic-plastic region), FEA using ABAQUS shows that the CF (constraint factor) for Ti-6Al-4V, first increases and then decreases with increase in temperature. however, at higher strain (i.e., fully plastic region) the CF increases and then become constant....
but literature which was done experimentally on same material(2006) shows CF decreases at lower strain and becomes constant at higher strain with increase in temperature...
I am working on heat transfer in rotating pipes that is made to rotate at a distance from the central axis of the pipe in parallel mode. I am using FLUENT for the simulation. Can anyone help to confirm that the distance from central axis of pipe to the centre of rotation (represented by eccentricity H) is the same as the input 'rotation-axis origin' in FLUENT?
I am interested in developing a virtual platform for collaborative engineering design and problem solving. I would like to be able to conduct network analysis to monitor team/individual interactions, information flow, idea conception, and evolution, etc.
For instance I build a ball falling model, at first I didn't consider the ball's deformation when contact with the base. So it seems easily to compute the force if we give the stiffness coefficient K and damping coefficient C the contact force F could be : Fforce=K*[(r+h)-DM(marker_1,marker_2)]-C*VM(marker_1,marker_2)
And it is easily to return the Fforce's value to Adams in sfo-subroutine file by one sentence:value = Fforce ;return. Now I want to consider the deformation of the ball(dr) and the dr is related to Force such as: dr=f(Force),and so the new formulation for the Force will be : 【Ffoce=K*[(r+h-dr)-DM(marker_1,marker_2)]-C*VM(marker_1,marker_2) 】
Because the two variable correlative with each other could you give me an advice how could I define the variables in SFOSUB-subroutine and compute the value of Fforce?
I need a coolant convection coefficient ''library'' or suggestions to calculate this coeff. To setup some FEM simulations of turning machining processes. Thanks a lot for any help or suggestion.
In case of Response Surface Methodology with Central Composite Design design what value of alpha is preferred? What is the effect of high value of alpha on DOE?In MINITAB17 how to change alpha value.
A research is being proposed for the development of an alloy suitable for severe corrosive environment. An explanation is needed for the maximum and minimum percentage inclusion of these ferro-alloys that will achieve significant protection.
During power reactor operation, the action of electromagnetic forces generate mechanical vibrations through the core, windings and mechanical stability system, resulting in high level noises. The technical challenge consists of obtaining the math relation between electromagnetic forces, mechanical vibration and noise.