Hearing-assist System with Omnidirectional Haptic Guidance to Track Sound Sources?| Chapter 8 | Research Developments in Science and Technology Vol.4

We created a hearing aid that allows persons with hearing loss to monitor the horizontal movement of a single sound source. The subject is shown the movement of the sound source by vibrating the vibrators on both shoulders in accordance with the distance and direction of the sound source, which are calculated from the acoustic signals detected by microphones in both ears. We showed the subject the direction and distance to the sound source by adjusting the ratio of the two vibrators' strength according to the direction and increasing the intensity as the individual came closer to the sound source. By rotating their face in the direction where the strength of both vibrators was equal, the subject could perceive the approaching sound source as a shift in vibration intensity. When an analogue vibration pattern is added to identify the direction of the sound source, the direction of the sound source may be tracked with an accuracy of less than 5°. It is feasible to show subjects the arrival and departure of a sound source by accurately portraying the direction of the sound source.

Author(s) Details:

Ryuichi Shimoyama,
Nihon University, Japan.

Please see the link here: https://stm.bookpi.org/RDST-V4/article/view/6856

Determination of Machinery Vibration in Radial Sliding Bearings with Integrated Liquid Dampers | Chapter 11 | New Approaches in Engineering Research Vol. 11

 The use of radial bearings with segments on a self-generated hydrostatic suspension has been substantiated in order to satisfy the requirements for precision positioning of axes and efficiency of stabilisation of shaft oscillations of power-consuming rotary machines. The methods of turbomachine dynamical analysis based on the modelling of the quasistationary processes in lubricating films that balance the harmonic loads on the rotor by redistributing the lubricant flow parameters in the bearing with integrated liquid dampers have been further developed. The complex approach for improving functional properties of turbomachine bearings on the basis of multicriteria optimization of hydraulic tracts parameters and lubrication system operating modes is presented.

Author (S) Details

Aleksandr Kiryukhin
Department of Ship Power Plants Exploitation, Black Sea Naval School named by P.S. Nakhimov, Sevastopol, Russia

View Book :- https://stm.bookpi.org/NAER-V11/article/view/3571

Investigating the Cutting Mechanics in 2 Dimensional Ultrasonic Vibration Assisted Milling towards Chip Thickness and Chip Formation | Chapter 1 | Advanced Aspects of Engineering Research Vol. 15

 To produce the desired result, a high-quality and precise machine and tool component is required. It is critical to discover the optimal option for manufacturing in a shop floor machine factory, taking into account tool condition, tool failure, thermal softening, and surface polish, among other factors. The goal of this research is to look at the impacts of two-dimensional Ultrasonic Vibration Assisted Milling (UVAM) cutting mechanics on chip thickness and tool path trajectory. The trajectory of the tool locus into the workpiece during machining is taken into account in the theoretical modelling of cutting mechanics. The major advantages of VAM, according to the studies, stem from the intermittent tool tip interaction phenomenon between the cutting tool and the workpiece. Vibration assisted milling in two dimensions can reduce thinning chip thickness formations, which can be identified as a benefit. The effect of the tool entering and disengaging from the workpiece was revealed to be the main cause of cutting force reduction, temperature reduction, extended tool life, discontinuous, thinning, and improvements in chip formation, as well as improving surface roughness.

Author (S) Details

I. Rasidi I.
Faculty of Mechanical & Manufacturing Engineering, Universiti Tun Hussein Onn Malaysia, Parit Raja, Johor, Malaysia.

N. H. Rafai
Faculty of Mechanical & Manufacturing Engineering, Universiti Tun Hussein Onn Malaysia, Parit Raja, Johor, Malaysia.

E. A. Rahim
Faculty of Mechanical & Manufacturing Engineering, Universiti Tun Hussein Onn Malaysia, Parit Raja, Johor, Malaysia.

S. A. Kamaruddin
Faculty of Mechanical & Manufacturing Engineering, Universiti Tun Hussein Onn Malaysia, Parit Raja, Johor, Malaysia.

H. Ding
School of Mechatronics Engineering, Harbin Institute of Technology, Harbin 150001, China.

K. Cheng
Advance Manufacturing Engineering Enterprise, School of Engineering and Design, Brunel University, West London UB8 3PH, United Kingdom.

View Book :- https://stm.bookpi.org/AAER-V15/article/view/1737

Determining the Effect of Flow Variations to Vibration Tendency in a Hydraulic Manifold | Chapter 12 | New Approaches in Engineering Research Vol. 4

 A hydraulic manifold is an important component in hydraulic machinery that transports high-pressure hydraulic oil into hydraulic tubes and hoses for cleaning. Because of the high pressure used during operation, this process causes vibration and the possibility of leakage at the hydraulic manifold's exit ports. The purpose of this research is to determine the effects of pressure and velocity variations in a hydraulic manifold on vibration tendency. Computational fluid dynamics (CFD) is used in this study to simulate the hydraulic manifold fluid behaviors. under the operating conditions of the industry The results show that pressure and velocity fluctuations occur at each branch of a mainstream due to changes in area and geometrical shape. At each branch, there was a surge of pressure but a decrease in velocity. Overall, the results show that the areas closest to the inlet are the most affected. The increments have little effect on areas further downstream. According to our calculations, the vibration tendency occurs in the hydraulic manifold cavity due to differential pressure and velocity, negative pressure, low velocity, swirl flow, and back stream.

Author(s) Details

Norazhar Ali
School of Mechanical Engineering, Universiti Teknologi Malaysia, Johor, Malaysia.

Kahar Osman
School of Mechanical Engineering, Universiti Teknologi Malaysia, Johor, Malaysia.

Fazila Mohd Zawawi
School of Mechanical Engineering, Universiti Teknologi Malaysia, Johor, Malaysia.

Muhammad Noor Afiq Witri Muhammad Yazid
School of Mechanical Engineering, Universiti Teknologi Malaysia, Johor, Malaysia.

View Book :- https://stm.bookpi.org/NAER-V4/article/view/1888

Investigating the Effect of Rotor Angle to Characteristic Amplitudo Vibration Shaft on Wind Turbine Horizontal Axis Testing | Chapter 6 | New Approaches in Engineering Research Vol. 4

 The vibrations that occur in the wind turbine's axis are a result of the unstable wind velocity caused by the angle of the wind attacked by the wind turbine's blade. Because abundant energy sources such as wind and water have not been fully utilized, this study will seek to improve efficiency. Vibration is a popular tool for analyzing machines with both rotational and translational motion. Vibration is a popular tool for analyzing machines with both rotational and translational motion. Data and vibration knowledge will be of critical importance for the treatment of repair analysis and also. This knowledge can help technicians. reduce the occurrence of downtime and can improve advantage from both the aspect of peroduksi and the longer wind turbine age Vibration caused by the effect of the style of siklik [pass/through] existing machine elements, where the elements are displaying each other and didesifikasienergi [pass/through] structure in the form of vibration. The impact of vibration is the occurrence of clunk, a decrease in wind turbine performance, and the destruction of wind turbine components, particularly at the pad and axis. This study of angle includes corner variation of blade (sudu / wind turbine rotor) to axis as well as variation of incoming wind speed. With a change in can perceive an known by the vibration behavior that occurred by measuring with appliance mengunakan agree vibration of vibrometer VQ-400-A OMETRON which in circuit with U3-Lv labjak distribute to PC in the form of digital voltage to analogous voltage This model measures vibration along the horizontal axis of the abscis or along the rotatory wind turbine axis. To present the results of measurements taken by labjak, which is connected to a PC laptop via a circuit. This study found that for wind speeds [among/between] 3 - 4,5 m/s with the smallest deviation, use angle; corner of blade 30o [so that/to be] vibration that happened more minimal, which is [among/between] 0,2353425 mm to 0,356839 mm. According to the critical frequency calculation, if the turbine rotation frequency is 9,464226 Hz and the simulation software ANSYS is used, the frequency is 4,1854 Hz.

Author (S) Details

Aston Sianipar
Department Mechanical Engineering FT-UHN, Jl.Sutomo No.4-A, Medan 20234, Indonesia.

View Book :- https://stm.bookpi.org/NAER-V4/article/view/1882

Studies on Analytical Determination of the Vibrations of a Load, Twice Elastically Suspended from an Elastic Beam via Another Load | Chapter 9 | Advanced Aspects of Engineering Research Vol. 7

 The dynamics of mechanical systems with suspended loads, such as bridge cranes, monorail hoists, mining machines, and so on, are examined in this chapter. A load is hung twice elastically from an elastic beam via another load in the mechanical system under consideration. The purpose is to determine the mechanical system's vibrations with suspended loads. The system is developed with two dynamical models that respect the kinetic energy of the elastic ropes, and their corresponding differential equations of motion are produced. The vibration of the mechanical system is described by a coupled system of two ordinary and n^(n=1,2,….) partial differential equations. Using general start conditions, the nonlinear restoring forces are linearized using the equivalent linearization method, and an analytical solution for the differential equations of both dynamical models is found concurrently. The integration constants are calculated analytically for a specific instance of the start conditions, which indicates a common application. The mechanical system is numerically simulated using initial circumstances that correspond to common operating regimes of real systems with suspended loads.

Author(s) Details

Vassil Zlatanov
Department of Technical Mechanics, University of Food Technologies, Plovdiv, Bulgaria.

Stefan Bachvarov
Department of Mechanics, Technical University, Sofia, Bulgaria.

Snezhana Atanasova
Department of Technical Mechanics, University of Food Technologies, Plovdiv, Bulgaria.

View Book :- https://stm.bookpi.org/AAER-V7/article/view/967

Effect of Creep in the Fundamental Frequency and Stability of a Slender Wooden Column of Composite Section | Chapter 6 | Cutting-edge Research in Agricultural Sciences Vol. 8

 Since wood is a viscoelastic material, creep is a possibility in wooden structures. Creep will alter the strictly elastic parameters defined in initial wood characterization tests because its behaviour is influenced by the material's rheology, even at constant stress levels. Models in which the immediate elastic deformation is increased by a viscous deformation, resulting in a temporal function, can be used to describe creep mathematically. As a result, the reducing effects of stiffness, both axial force and creep, should be included in the measurement of the normal frequency of vibration and the stability verification of a slender column. The first can be considered via the geometrical part, and the second by introducing a variable elasticity modulus over time, obtained in relation to the chosen rheological model, into the traditional portion. To test the aforementioned aspects, a numerical simulation was performed using a rheological model with three parameters for the variation of the elasticity modulus, with a bar compressed by a force at the free end equal to 10% of the Euler critical force, plus its own weight. The findings show 60 percent and 50% variations in frequency and elasticity modulus, respectively, in addition to describing the precise moment of column collapse in the event of non-observance.

Author (s) Details

Alexandre de M. Wahrhaftig
Departamento de Construção e Estruturas, Escola Politécnica Universidade Federal da Bahia (UFBa), Rua Aristides Novís, nº 02, 5º andar, Federação, Salvador – BA, CEP: 40210-910, Brasil.

Reyolando M. L. R. F. Brasil
Centro de Engenharia, Modelagem e Ciências Sociais Aplicadas, Universidade Federal do ABC (UFABC), Avenida dos Estados, nº 5001, Bangu, Santo André – SP, CEP: 09210-170, Brasil.

Sandro F. César
Departamento de Construção e Estruturas, Escola Politécnica Universidade Federal da Bahia (UFBa), Rua Aristides Novís, nº 02, 5º andar, Federação, Salvador – BA, CEP: 40210-910, Brasil.

View Book :- https://stm.bookpi.org/CRAS-V8/article/view/788

Smart Device Identification of Potsherds and Gemstones with Radiofrequency-Induced Harmonics Vibrations | Chapter 11 | New Ideas Concerning Science and Technology Vol. 11

 In materials like potsherds and precious or semiprecious gemstones, radiofrequencies can cause specific vibrational signatures. We previously described a method for identifying pottery shards using ultrasound stimulation and vibrational characteristics. The experimental technique for extracting such signatures from ceramic shards and precious gems using radiofrequency stimulation is now detailed. The technique offers a possible method of on-site substance recognition by extracting vibrational signatures quickly and cheaply and comparing them to a database library.

Author (s) Details

Baxton R. Chen
Harvard University, Cambridge, MA 02138, USA.

View Book :- https://stm.bookpi.org/NICST-V11/article/view/685

Studies on Forced Response of Polar Orthotropic Tapered Circulars Plates Resting on Elastic Foundatio | Chapter 2 | New Insights into Physical Science Vol. 5

 

Forced axi-symmetric response of polar orthotropic circular plates of linearly varying thickness resting
on Winkler type of elastic foundation has been studied on the basis of classical plate theory. An
approximate solution of problem has been obtained by Rayleigh Ritz Method, which employs
functions based upon the static deflection of polar orthotropic circular plates. The effect of transverse
loadings has been studied for orthotropic circular plate resting on elastic foundation. The transverse
deflections and bending moments are presented for various values of taper parameter, rigidity ratio,
foundation parameter, flexibility parameter under different type of loadings. A comparison of results
with those available in literature shows an excellent agreement.

Author(s) Details

Dr. A. H. Ansari
Department of Mathematics, Albaha University, Albaha, KSA.

View Book :- https://bp.bookpi.org/index.php/bpi/catalog/book/245