What are the inconveniences of a linear quadratic regulator (LQR) used in seismic vibration control ?

Dear colleagues, greeting I'm working on a new type of controller that can substitute the classical controllers such as LQR (linear quadratic regulator). Hence, I want to know more about the...

02 March 2018 3,264 7 View

Dose the lost of exclusivitiy of information affected the motivation of the teachers ?

Greeting, I'm asking this general question for teachers and professors in all fields. With the advances of technologies and communication technics the exclusivity of the scientific information...

01 February 2018 968 12 View

What is the fault type of Christchurch, New-Zeland (2011) earthquake ?

Greeting to all researchers; I'm using a set of a near-fault, far-fault earthquakes in a study, and I want to use the Christchurch earthquake record. However, I'm confused about the fault nature...

11 December 2017 6,408 5 View

How to design a base isolator for a share frame structure ?

Dear researchers; I'm working on modelling a share frame structure in MATLAB the only parameters I have are: mass, stiffness and damping. and I want to design a base isolator for this kind of...

31 December 2016 8,816 4 View

Is there any benchmark model for 3D building under seismic excitation ?

Dear researchers; I'm trying to apply some semi-active control on a 3D building excited with uni-directional or bi-directional excitations, with and without eccentricity (rotational degree of...

05 June 2016 6,227 2 View

How to verify the results in a numerical study ?

03 April 2016 2,095 4 View

Why some researchers try to monopolise the science ?

Dear researchers; I've seen a lot of research scholar complaining about getting their work rejected by some reviewers, just because those researchers don't want some else to publish in their...

31 December 2015 9,909 4 View

What is the difference between corrected and uncorrected earthquake ?

Dear researchers; What is the difference between corrected and uncorrected earthquakes ? Warm regards.

31 December 2015 5,686 0 View

How to write a 3D building motion equation ? and how to solve it in state space ?

11 December 2015 655 9 View

How do I apply harmonic loading to a 2 storey building frame in ANSYS or ABAQUS?

dear researchers I want to apply harmonic sine load to 2 story building frame. Building is going to model in Ansys/Abaqus and this for time history analysis of the structure. also suggest which...

11 December 2015 2,802 5 View

error in running a model in Abaqus

Excessive rotation of nodes in node set ErrNodeExcessRotation-Step1

17 August 2021 0 0 View

error in modelling model in Abaqus

Excessive rotation of nodes in node set ErrNodeExcessRotation-Step1

17 August 2021 0 0 View

MGL tools

20 June 2021 0 0 View

what is the simplest definition of ion exchange capacity

What this unit identifies for the ion exchange capacity ca. 0.92 meq. g-1. I am a newcomer in the membrane area. I just started. I highly appreciate your help

08 May 2021 0 0 View

what is the simplest definition of ion exchange capacity

What this unit identifies for the ion exchange capacity ca. 0.92 meq. g-1. I am a newcomer in the membrane area. I just started. I highly appreciate your help

08 May 2021 0 0 View

i have some problem with chtMultiRegionSimpleFoam

--> FOAM FATAL ERROR: Maximum number of iterations exceeded From function Foam::scalar Foam::species::thermo::T(Foam::scalar, Foam::scalar, Foam::scalar, Foam::scalar (Foam::species::thermo::*)(Foam::scalar, Foam::scalar) const, Foam::scalar (Foam::species::thermo::*)(Foam::scalar, Foam::scalar) const, Foam::scalar (Foam::species::thermo::*)(Foam::scalar) const) const [with Thermo = Foam::hConstThermo >; Type = Foam::sensibleEnthalpy; Foam::scalar = double; Foam::species::thermo = Foam::species::thermo >, Foam::sensibleEnthalpy>] in file /home/ubuntu/OpenFOAM/OpenFOAM-4.1/src/thermophysicalModels/specie/lnInclude/thermoI.H at line 66. FOAM aborting #0 Foam::error::printStack(Foam::Ostream&) at ??:? #1 Foam::error::abort() at ??:? #2 Foam::heRhoThermo >, Foam::sensibleEnthalpy> > > >::calculate() at ??:? #3 Foam::heRhoThermo >, Foam::sensibleEnthalpy> > > >::correct() at ??:? #4 ? at ??:? #5 __libc_start_main in "/lib/x86_64-linux-gnu/libc.so.6" #6 ? at ??:?

24 March 2021 0 0 View

Can we classify HV and LV lines based on line length?

I have dataset which shows the length of power lines. I need to classify the lines based on the line length. Is there a rule to classify the High voltage (HV) and low voltage (LV) lines based on...

03 March 2021 4,116 4 View

What is the production process of CaFe ferroalloys?

I looking for ferro calcium production process

03 March 2021 1,755 4 View

What techniques can I use to determine the miscibility of polymer blends?

The term miscibility refers to the single-phase state in thermodynamics. I do not mean the compatibility of different components. To determine the miscibility I know several techniques such as...

03 March 2021 4,107 4 View

Resistor definition in Piezoelectric bimorph with ANSYS workbench

Hello, good day! I am trying to simulate similar bimorph piezoelectric harvester with below commands. However, the output power doesn't change with resistor value. Please help to find the reason. ET,10,CIRCU94,0 !SET UP RESISTOR R,1,100000 !RESISTANCE VALUE TYPE,10 !SET ELEMENT TYPE E,1,2 !CREATE RESISTOR BETWEEN NODES 1 AND 2 Thanks in advance Regards,

02 March 2021 0 0 View