Prediction of Room Noise Caused by Vibration of High Power Elevator Traction Machine

Total simulation from vibration of elevator motor to noise at sitting room with anti-vibration measures is confirmed in design stage. This procedure also presents decrease of acoustic noise in sitting room. In this simulation, FEM calculates wave motion, such as wave phase, interference, diffraction and natural frequency mode of sitting room wall. These procedures yield the ration between vibration of elevator motor and acoustic noise in sitting-room.

Noise Reduction at the Fan Outlet

The paper deals with numerical flow simulation in the fan outlet of a large painting shop. The received results of pressure fluctuations in numerical models are evaluated using both frequency analysis of pressure fluctuations and measuring and evaluation of a really operating system. From the conclusion there is defined the hypothesis of noise origin and more, it is proposed a more suitable design of the system without creation of pressure fluctuations. The system is ready for implementation.

Geometric Comments on Music

In fact degrees of the middle chromatic scales are related with the logarithm (base 2). With relying on this fact, In this study by using logarithm and string oscillation properties, we show that music notes (A − B − · · ·) are related with the interval (0, a] (a is constant) and then we define a topology on this interval. Finally Lie algebra for the mentioned interval of music will be characterized.

Development of an Adjustable Frequency Device for a Test Vehicle Based on Curved Beam Theory

In this article, an adjustable frequency device based on curved beam theory is designed to control vertical stiffness of an instrumented vehicle that it can detect dynamic data when moving on a test beam for frequency measurement. The adjustable frequency device consists of a set of two-layer cantilever semi-circular thin-beams to support a lumped mass for vibrations, in which a rotatable U-frame is used to change its subtended angle for adjustment of the supporting stiffness and corresponding vertical frequencies of the vehicle. Based on curved beam theory, an analytical frequency equation of the single-degree-of-freedom test vehicle was derived and applied to mobile frequency measurement of a simple beam. To determine the sectional rigidity of the semi-circular thin-beams, both theoretical and experimental studies were be carried out in the ITAM laboratory of the Academy of Science in Czech. The analytical and experimental results indicated that the present semi-circular beam model with guided ends is applicable to prediction of natural frequencies of the test vehicle considering different supporting stiffness

Implementation of an LDPC decoder for IEEE 802.11n using VivadoTM High-Level Synthesis

The increasing complexity of hardware designs calls for design methodolgies that use more abstract design entries and increased automation of the implementation process. Highlevel synthesis (HLS) has been a research topic for the past 20 years, and current tools, such as Xilinx VivadoTM HLS promise to bring HLS to widespread use. In this paper we use Xilinx VivadoTMHLS to design an LDPC decoder for 802.11n. Forward error correction decoders are typically implemented in hardware due to the high processing requirements and therefore an LDPC decoder is an appropriate example to demonstrate the power of high-level synthesis

Restoration circuits for Low power Reduce Swing of 6T and 8T SRAM Cell With Improved Read and Write Margins

A paper that examines the factors thataffect the Static Noise Margin (SNM) of a StaticRandom Access memories. At an equivalent time,they specialise in optimizing Read and Writeoperation of 8T SRAM cell which is best than 6TSRAM cell Using Swing Restoration Dual NodeVoltage. The read and Write operation and improveStability analysis. This SRAM technique on thecircuit or architecture level is required to improveread and write operation. during this paperComparative Analysis of 6T and 8T SRAM Cellswith Improved Read and Write Margin is completedfor 180 nm Technology with Cadence Virtuososchematics Tool.This Paper is organized as follows: thecharacteristics of 6T SRAM cell are described arerepresented in section VIII. In section IX, proposed8T SRAM cell is described. In section X, Standard8T SRAM cell is described. Section XI includes thesimulation results which give comparison of variousparameters of 6T and 8T SRAM cells. In Section XIISimulation Results and DC analysis and sectionXIII conclusion the work.

Effects of Music on Driver Behavior

The attention level of car drivers is affected by many factors. Music is one of the most importantones, but its effect is rarely studied. Music can affect driving style in both positive and negative ways, as itcan reduce fatigue but also increase the level of distraction or aggression. This article presents anexperimental investigation of the effects of music on driver attention level. Several measurements on avehicle simulator were done to collect data that demonstrates the relationship between music and theperformance of the car driver. The simulation measured performance under three conditions - relaxationmusic, rock music and silence. Additionally, the measurements were repeated in both fresh and tired states.The results are, in some aspects, different from our expectations - for example, relaxation music improvedreaction time but also correlated with a higher occurrence of inappropriate steering actions. Deeperunderstanding of how the music and noise affect the driver’s actions and decisions will help to improveroad safety and reduce the probability of accidents

The Use of Time-Scale Analysis in Forensic Acoustical Investigations

The identification and characterization of noise events is one of the most important task in acousticalforensic analysis. In this field it is often fundamental to distinguish, within a complex acoustical framework, thedifferent noise events, especially because, in many cases, the operator cannot be present at the measurements. Itis fundamental to be able to distinguish the atypical or extraneous noise events from the specific ones underinvestigation and know what type of sources make up the noise climate. To this aim is essential to develop a time- frequency analysis technique able to overcame the known limitations of the “traditional” 1/3 of octave frequencyanalyses. In this paper a novel technique, based on multiresolution analysis, has been developed and applied tosome forensic “typical” problems, showing that a suitable choice of the analysis parameters can be able to answerto the main questions of this field

Does Music Help to Stay Focus on the Road?

Attention in the physiological definition in one of several simultaneous occurrences of ideas takes ownership of the mind which means removing certain stuff to cope efficiently with others. Particular attention is required in driving in order to maintain track of the driver's vigilance to prevent the road accident. In this study, the driver's attention is analyzed by their driving performance from both the amplitude and accident rating of Electroencephalographic (EEG). The subjects were stimulated with radio talk, instrumental music and no sound (silent) in three separate recordings. It was found that drivers encounter much fewer accidents while listening to the radio talk compared to the music and worse driving score when driving in silence. This finding could be used as a foundation to develop tips or methodology to avoid the attention deficit while driving.