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

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

How to repeat an operation on an atom selection for multiple times in PyMol?

Hi, I am trying to construct a multi-layer fibril structure from a single layer in PyMol by translating the layer along the fibril axis. For now, I am able to use the Translate command in PyMol...

02 March 2021 4,569 4 View

What analysis to choose with a large neste dataset and clearly skewed or kurtotic distributions?

Hello! I have a dataset of n=3000 nested within 8 countries with approximately 200 or 400 responses in each country. I originally planned to perform multilevel modelling with 4 dependent variables...

02 March 2021 6,865 1 View

Timeout error!! Processor in the loop (PIL) using STM32F4 Matlab 2018a?

Dear Researchers I am trying to perform a PIL simulation using STM32F4 Discovery board and comunication serial USB TO TTL. During simulation I receive the following timeout error: An error...

01 March 2021 2,327 1 View

Which is suitable for use with Python? MySQL or SQL Server?

Which is suitable for use with Python? MySQL or SQL Server? What is your suggestion?

01 March 2021 3,422 3 View

How to define tie constraint between rigid body and another part in dynamic explicit model of Abaqus?

Hi dear researchers I connected a rigid body into the part of my structure by tie constraint and then I added displacement to rigid body, in static general step every thing is fine and these two...

28 February 2021 3,442 2 View

How to eliminate Steady state error from Reinforcement learning genetic algorithm code?

The following code (see 1st 2 images attached) is used to produce PID controller values that are designed to control the system (G). The code finds the PID controller values (noted as k) by using...

28 February 2021 6,560 14 View

How to prevent ANFIS Model from negative prediction values in MATLAB?

I have input and output data set for "ANFIS modeling in MATLAB", and I am getting some negative predicted values of output in testing. However, the predicted values of output in training are...

28 February 2021 3,459 3 View

How to plot the probability paper of Gumbel distribution using R programing?

In R-studio, there are many commands of Gumbel package. Arguments are also different. I`m asking about the alpha parameter of the Copula which must be greater than 1. If this is the one used to...

25 February 2021 5,229 3 View

How does an AC-DC power supply Flyback Converter Based USB Charger Model using Matlab/Simulink looks like?

I am required to learn about Flyback converters and I got stuck not knowing to full design of the power supply flyback converter Based USB Charger Model using Simulink, especially the design model...

25 February 2021 5,435 2 View