Relevant numerical techniques, which have been done with the help of MATLAB routines, are applied to solve the arising optimization problem and to find the optimum parameters of the TMD. For a given mass ratio, µ, one can assume different values of the frequency ratio, f, and for each frequency ratio assuming a range of damping factor ζ2 of the TMD and estimate the optimum parameters that minimize a certain desired output. Fig. 8 is an example of the numerical optimization conducted to estimate the optimal frequency ratio and damping factor of the TMD for two different mass ratios under wind loads modeled as white-noise. The optimization is based on the minimization of the displacement of the primary structure. In this numerical optimization, the responses of the primary structure are normalized, which means that the response obtained with the TMD when attached to the structure is divided by the corresponding response obtained without the TMD. The optimal values of the frequency ratio and the damping factor of the TMD are written on the subfigures. It is shown that a TMD with 1% mass ratio can provide a significant reduction in the displacement response of the primary structure. The reduction in the displacement depends very much on the tuning frequency and the damping ratio of the TMD. By increasing the mass ratio from 1% to 5%, the displacement response of the primary structure is reduced. However, the TMD with 5% mass ratio is more robust to the changes in the frequency
After the analysis on the first design brought to light the zero for members, it was decided that these members should be removed. In order to combat the flex of such a simple design the decision was made to double the thickness. This design would have the same outer frame of two triangles with a height of 20 centimeters and a width of 40 centimeters. Instead of being spaced five centimeters apart the wood be bonded directly together using Gorilla Glue. Balsa wood, a very lightweight wood with properties similar to a dense foam, was used for the main supporting member. Basswood, a lightweight yet firm wood, was used for the horizontal member. The final design added a triple layer sheet of balsa wood to rear side of the truss. This balsa sheet was added for the purpose of mounting and supporting the main structure. Additionally, a five centimeter square frame of bass wood was added at the end of the boomilever to place the loading block for testing. Once this design was implemented two key issues were discovered. First, due to the properties of the bass wood and balsa wood it was obvious that the placement needed to be reversed. The bass wood should be used for the hypotenuse and the balsa wood should be used for the
With modern computational methods, most notably finite element analysis, designers are now able to simulate the response of a structure under a multitude of highly complex loading conditions. Another important aspect of these tools are their ability to solve ever increasingly complex problems in a faster time than ever before. These advanced computational tools also allow engineers to optimize designs much faster. These new optimal designs will improve the strength and stiffness of structures and lower their weight. This will not only improve a design's performance, but also help improve efficiency. These abilities are very exciting since they allow for a more fully developed and accurate picture of a structure's performance evident even in the most demanding
Apart from the single objective functions considered for this problem, a combined function is also used to perform the multi-objective optimization for the FMS parameters. The function and the variable limits are given using following function. Equal weights are considered for all the responses in this multi-objective optimization problem. Hence W1 and W2 are equal to 0.5.
Structure analysis is very important in design of MEMS devices in order to optimize the device performance. In the following step of this paper an analysis of a doubled ended tuning fork in the presence of an axial forced is performed. Then scale factor for this sensor is derived from relationship between natural frequency of the resonator and the applied
Furthermore, when the millennium bridge opened within the first weekend around 100,000 people had crossed the bridge. Due to such heavy traffic, this lead to something called resonance. Resonance is when the input vibrations frequency coincides with the natural frequency of the structure itself, causing large deflections to develop. The issue caused the bridge to undergo a swaying movement; hence led to its closure. After extensive research and analysis, it was found that the movement was caused by synchronized pedestrian footfall. To prevent this there were two options taken into account the lateral stiffening and the damping; both were used in order to increase the natural frequency of the structure so it did not match the footfall. In addition structures called fluid-viscous dampers and tuned mass dampers were installed to control both horizontal and vertical movements.
For the damping measurement in simple structures such as a beam where the damping of the system is not too high (typically $\eta<0.01$) the free vibration condition in time domain is the most suitable method. In this method, there exist initial displacement in the structure. Releasing the structure from this initial displacement, the magnitude of vibrations of the displacement is recorded as a function of time. An example of measurement can be seen in Figure \ref{fig: measestfig2}.
I found this week’s reading in AFY 100, Accuracy and Functionality: Care, Cleaning, and Storage of Firearms to be quite monotonous because throughout my adult life proper weapons care, and storage was hammered into my brain by the Marine Corps. I suppose though, that there’s nothing lost by sharpening up on the knowledge one already has… so here it goes.
Performance enhancement supplements and drugs are a billion dollar industry due to their growth and popularity with athletes of all ages. There are two types of performance enhancement substances: legal and illegal. Substances that are considered legal are usually naturally occurring and are easily available. A substance is usually deemed illegal because it is manufactured, possibly more harmful than helpful to an athlete’s body, violates the spirit of sport, and banned by many sport organizations. Although this industry continues to grow it usually stirs up some controversial conversations.
Before using the machine, dimensions must be taken of the cylinder, dimensions of the inlet and outlet, the distance from the cradle to the pivot point, the distance from the weight balancing collar to the pivot point, and the distance from the cylinder to the pivot point. Prior to engaging the machine’s fan, the apparatus must be balanced. Referring to Figure 1, move the weight balancing collar to balance the moments. At this time the mass of the weight added to the cradle and the drag force is zero. Once the apparatus is balanced, measure the distance from the weight balancing collar to the pivot point. The fan can now be turned on. Balance the apparatus now by adding weight to the cradle to counter balance the now existent drag force. Record the added weight. The drag force can be found by Equation 2 which is derived from Equation 1.
There are several strategies that are available to provide support for educating inclusion students with general education students. However, students with learning disabilities in inclusive classrooms should include co-teaching, differentiated instruction, and peer-mediated instruction and interventions. This Theory suggests the practice of inclusion is congruent with social justice, but evidence suggests mixed results regarding academic achievement. The Least Restricted Environment (LRE) mandate that inclusion have both adequate support among various interests groups including: parents, school professionals, researchers, and advocates (2012, p. 2).
Sarah Van Deusen’s computer has been set up in her office. Microsoft Office Suite 2013, ShoreTel, Adobe Reader, JustWare and Symantec Endpoint Protection have been installed. Xerox 7970 and HPLJ p1102w(local) have also been set up.
Hey! Can you please please make a post about epilation? I have so long been thinking about buying an epilator but they they are said to be the best is so expensive and people want to be the sure way, it even works well. I wonder if it really works well, therefore, that all the hair disappears like when you shave your legs. I would be incredibly happy if you did a post about this. Your blog is awesome! Hug
We assume that the coupon interest is fixed, then the price of bonds(P)is the discounted cash flows of each period:
ABSTRACT---Computer games have made their presence vocal by making themselves present in the home .This paper discusses on of the board games: Othello. The game of Othello has proved its prominence by being an active research area since long time now and has been successful to grab extensive focus of researchers, knowledge engineers and game developers. its execution time and complexity is good .it is an appropriate choice to be considered as a benchmark in the games development .In this paper we have compared different available strategies at length.
Automatic Frequency Planning and Optimization Algorithm for Cellular Networks Muhammad Umair, Waleed Bin Shahid, Masab Javed Abbasi, Department of Electrical Engineering Royal Institute of Technology (KTH) SE100-44 Stockholm, SWEDEN E-mail: mumair@kth.se, waleed.shahid@mcs.edu.pk , masab.abbasi-pc@telenor.com.pk Abstract— Frequency planning in ever growing cellular networks is an extremely arduous task. Any effort to lay down manual frequency plans promulgates inefficiency in the cellular radio systems. The extensive deployment and penetration of cellular networks necessitate the need to carry out automatic frequency planning.