The Experts below are selected from a list of 3063 Experts worldwide ranked by ideXlab platform

Nobuyuki Iwatsuki - One of the best experts on this subject based on the ideXlab platform.

  • Estimation and Measurement of the Sound Power Radiated from a Circular Plate with a Solid Shaft and a Solid Cylinder.
    Jsme International Journal Series C-mechanical Systems Machine Elements and Manufacturing, 1998
    Co-Authors: Kang Heng, Iwao Hayashi, Nobuyuki Iwatsuki
    Abstract:

    The overall aim of this research is to establish an effective method for accurately estimating the airborne noise power radiating from the gear blank of aircraft gears.For this purpose, the estimation theory of sound power radiated from a circular plate with a Solid Shaft and a Solid cylinder, which is a simple model of the gear blank of an aircraft gear, has been described.The forced vibration of the circular plate with a Solid Shaft and a Solid cylinder was solved by assuming that the displacement of forced vibration is equal to the linear sum of the eigenfunctions of the displacements of the circular part and the cylinder part.Using the obtained result, the equations for calculating the frequency spectra of three important parameters-the radiation loss factor, driving point mobility, and total loss factor of the circular plate with a Solid Shaft and a Solid cylinder, were derived.Calculating the frequency responses of the three parameters and measuring the spectrum of the excitation force, the sound power, when the circular plate was subjected to the axial and three-dimensionally excitations, were estimated, and compared with the measured frequency responses of sound radiation power obtained by means of the sound intensity method.The estimated freqyency spectra of sound radiation power coincided with the measured values.The derived estimation theory and the associated formulae are valid, consequently.

  • reduction of sound power radiated from a circular plate with a Solid Shaft and a Solid cylinder
    Proceedings of SPIE the International Society for Optical Engineering, 1997
    Co-Authors: Kang Heng, Iwao Hayashi, Nobuyuki Iwatsuki
    Abstract:

    The sound power radiating from a thin circular plate with a Solid Shaft and a Solid cylinder, which is a simple model of aircraft gears, is estimated with the estimation theory which the authors have proposed. The estimation results, namely the frequency spectra of sound power, coincide with the measured values. Since it is made sure from these results that the estimation theory is valid, the authors then estimated the sound power radiating from the circular plate with the estimation theory to study the influence of cylinder thickness to the radiating sound power. Consequently, the following results are obtained: the increase of cylinder thickness is effective to reduce the radiating sound power; the peak values of sound power at natural frequency are reduced from 3dB to 30dB for almost modes, and the overall reduction of sound power is 8dB if the thickness of cylinder is increased two times.

  • the estimation and measurement of the sound power radiated from a circular plate with a Solid Shaft
    Proceedings of the 14th International Modal Analysis Conference, 1996
    Co-Authors: Iwao Hayashi, Nobuyuki Iwatsuki, M Maki, Atsushi Hayata
    Abstract:

    Aiming to to develop an effective method for estimating the sowzd power radiating from gear mechanisms during the design stage, this paper deals with the basic theory for estimating the sozlnd power radiating from a vibrating object., Choosing a circular plate with a Solid Shaft as a simple model of gear blanks, eguations were derived for precise@ cakulatirig ‘the frequency characteristics of the three factors of the circzdalplate the total loss factor, the driving point mobility and the radiation loss factor of the circdar plate, which are very important for the estimation. To examine the estimation formula and the associated formulae, experimental data were obtained by impzllsively exciting the CiTCUhT plate on a point Of the Surface both in an axial direction and in a three-dimensional d&ction, and then measuring the interwity of the mdiating sound pourer. The three important factors for estimating this power were calculated with the theoretical formulae, and the sozmd power W(LS then estimated substituting the measured exciting force into the estimation fomnda. The estimated frequency responses of radiating sound powers agree well with the mewwed voJues.

  • The Estimation and Measurement of the Sound Power Radiated from a Circular Plate With a Solid Shaft Subjected to an Axial Load
    Journal of Sound and Vibration, 1994
    Co-Authors: Iwao Hayashi, Nobuyuki Iwatsuki, H. Maki
    Abstract:

    Abstract The aim is to establish a method for accurately estimating gear noises radiated by the flexural vibration of gear blanks. The basic theory from which is derived the frequency characteristics of radiated sound power is presented. First, the basic theory for estimating radiated and sound power is derived from the definition of loss factor given by Ungar and Kerwin and is confirmed to apply at all frequencies. Second, a thick circular plate with a Solid Shaft is chosen as a simple model of gear blanks. The natural modes of flexural vibration of the circular plate have been theoretically analyzed in the companion paper [1]; the rigid body modes of vibration of the circular plate are theoretically analyzed in this paper. These analyses produce formulae for deriving the frequency characteristics of three important factors for estimation: the total loss factor, driving point mobility and radiation loss factor of the circular plate. To examine the estimation formula and the associated formulae, experimental data is obtained by impulsively exciting the circular plate in the axial direction, and then measuring the intensity of the radiated sound power. The three important factors for estimating this power (the total loss factor, the driving point mobility and the radiation loss factor of the circular plate) are calculated from the theoretical formulae, and the sound power is then estimated by substituting the measured excitation force into the estimation formula. The estimated radiated sound power agrees well with the measured values both in the low and high frequency ranges where the rigid body modes and the natural modes of flexural vibration exist, respectively.

Werner Mack - One of the best experts on this subject based on the ideXlab platform.

  • transient heating of a rotating elastic plastic shrink fit
    International Journal of Engineering Science, 2000
    Co-Authors: Werner Mack, Manfred Plochl
    Abstract:

    The stress distribution in a rotating shrink fit with Solid Shaft subject to a temperature cycle is investigated. It is presumed that both components are in a state of generalized plane strain and exhibit the same elastic-perfectly plastic material behavior. Applying Tresca's yield condition and the flow rule associated with it, the problem is accessible to a quasi-analytical treatment. It is found that the interface pressure and therefore the transferable moment show a permanent reduction due to plastic deformation as well as a temporary reduction due to the thermal expansion of the hub; these effects may lead to a failure of the device.

  • rotating elastic plastic Solid Shaft with fixed ends
    International Journal of Engineering Science, 1997
    Co-Authors: Udo Gamer, Werner Mack, Imrich Varga
    Abstract:

    Abstract Based on Tresca's yield condition and the flow rule associated with it, the distribution of stress, strain, and displacement in a rotating elastic-perfectly plastic Solid cylinder with fixed ends is discussed. Special attention is paid to the behavior in the fully plastic state.

  • thermal assembly of an elastic plastic hub and a Solid Shaft
    Archive of Applied Mechanics, 1993
    Co-Authors: Werner Mack
    Abstract:

    Based on Tresca's yield criterion and the associated flow rule, the thermal assembly of an elastic-plastic hollow cylinder and a Solid Shaft is investigated. The transient stress distribution in the shrink fit is discussed and illustrated by numerical results.

Iwao Hayashi - One of the best experts on this subject based on the ideXlab platform.

  • Estimation and Measurement of the Sound Power Radiated from a Circular Plate with a Solid Shaft and a Solid Cylinder.
    Jsme International Journal Series C-mechanical Systems Machine Elements and Manufacturing, 1998
    Co-Authors: Kang Heng, Iwao Hayashi, Nobuyuki Iwatsuki
    Abstract:

    The overall aim of this research is to establish an effective method for accurately estimating the airborne noise power radiating from the gear blank of aircraft gears.For this purpose, the estimation theory of sound power radiated from a circular plate with a Solid Shaft and a Solid cylinder, which is a simple model of the gear blank of an aircraft gear, has been described.The forced vibration of the circular plate with a Solid Shaft and a Solid cylinder was solved by assuming that the displacement of forced vibration is equal to the linear sum of the eigenfunctions of the displacements of the circular part and the cylinder part.Using the obtained result, the equations for calculating the frequency spectra of three important parameters-the radiation loss factor, driving point mobility, and total loss factor of the circular plate with a Solid Shaft and a Solid cylinder, were derived.Calculating the frequency responses of the three parameters and measuring the spectrum of the excitation force, the sound power, when the circular plate was subjected to the axial and three-dimensionally excitations, were estimated, and compared with the measured frequency responses of sound radiation power obtained by means of the sound intensity method.The estimated freqyency spectra of sound radiation power coincided with the measured values.The derived estimation theory and the associated formulae are valid, consequently.

  • reduction of sound power radiated from a circular plate with a Solid Shaft and a Solid cylinder
    Proceedings of SPIE the International Society for Optical Engineering, 1997
    Co-Authors: Kang Heng, Iwao Hayashi, Nobuyuki Iwatsuki
    Abstract:

    The sound power radiating from a thin circular plate with a Solid Shaft and a Solid cylinder, which is a simple model of aircraft gears, is estimated with the estimation theory which the authors have proposed. The estimation results, namely the frequency spectra of sound power, coincide with the measured values. Since it is made sure from these results that the estimation theory is valid, the authors then estimated the sound power radiating from the circular plate with the estimation theory to study the influence of cylinder thickness to the radiating sound power. Consequently, the following results are obtained: the increase of cylinder thickness is effective to reduce the radiating sound power; the peak values of sound power at natural frequency are reduced from 3dB to 30dB for almost modes, and the overall reduction of sound power is 8dB if the thickness of cylinder is increased two times.

  • the estimation and measurement of the sound power radiated from a circular plate with a Solid Shaft
    Proceedings of the 14th International Modal Analysis Conference, 1996
    Co-Authors: Iwao Hayashi, Nobuyuki Iwatsuki, M Maki, Atsushi Hayata
    Abstract:

    Aiming to to develop an effective method for estimating the sowzd power radiating from gear mechanisms during the design stage, this paper deals with the basic theory for estimating the sozlnd power radiating from a vibrating object., Choosing a circular plate with a Solid Shaft as a simple model of gear blanks, eguations were derived for precise@ cakulatirig ‘the frequency characteristics of the three factors of the circzdalplate the total loss factor, the driving point mobility and the radiation loss factor of the circdar plate, which are very important for the estimation. To examine the estimation formula and the associated formulae, experimental data were obtained by impzllsively exciting the CiTCUhT plate on a point Of the Surface both in an axial direction and in a three-dimensional d&ction, and then measuring the interwity of the mdiating sound pourer. The three important factors for estimating this power were calculated with the theoretical formulae, and the sozmd power W(LS then estimated substituting the measured exciting force into the estimation fomnda. The estimated frequency responses of radiating sound powers agree well with the mewwed voJues.

  • The Estimation and Measurement of the Sound Power Radiated from a Circular Plate With a Solid Shaft Subjected to an Axial Load
    Journal of Sound and Vibration, 1994
    Co-Authors: Iwao Hayashi, Nobuyuki Iwatsuki, H. Maki
    Abstract:

    Abstract The aim is to establish a method for accurately estimating gear noises radiated by the flexural vibration of gear blanks. The basic theory from which is derived the frequency characteristics of radiated sound power is presented. First, the basic theory for estimating radiated and sound power is derived from the definition of loss factor given by Ungar and Kerwin and is confirmed to apply at all frequencies. Second, a thick circular plate with a Solid Shaft is chosen as a simple model of gear blanks. The natural modes of flexural vibration of the circular plate have been theoretically analyzed in the companion paper [1]; the rigid body modes of vibration of the circular plate are theoretically analyzed in this paper. These analyses produce formulae for deriving the frequency characteristics of three important factors for estimation: the total loss factor, driving point mobility and radiation loss factor of the circular plate. To examine the estimation formula and the associated formulae, experimental data is obtained by impulsively exciting the circular plate in the axial direction, and then measuring the intensity of the radiated sound power. The three important factors for estimating this power (the total loss factor, the driving point mobility and the radiation loss factor of the circular plate) are calculated from the theoretical formulae, and the sound power is then estimated by substituting the measured excitation force into the estimation formula. The estimated radiated sound power agrees well with the measured values both in the low and high frequency ranges where the rigid body modes and the natural modes of flexural vibration exist, respectively.

Manfred Plochl - One of the best experts on this subject based on the ideXlab platform.

  • transient heating of a rotating elastic plastic shrink fit
    International Journal of Engineering Science, 2000
    Co-Authors: Werner Mack, Manfred Plochl
    Abstract:

    The stress distribution in a rotating shrink fit with Solid Shaft subject to a temperature cycle is investigated. It is presumed that both components are in a state of generalized plane strain and exhibit the same elastic-perfectly plastic material behavior. Applying Tresca's yield condition and the flow rule associated with it, the problem is accessible to a quasi-analytical treatment. It is found that the interface pressure and therefore the transferable moment show a permanent reduction due to plastic deformation as well as a temporary reduction due to the thermal expansion of the hub; these effects may lead to a failure of the device.

Виноградский, Дмитрий Георгиевич - One of the best experts on this subject based on the ideXlab platform.

  • Mutual influence of connections with a tightness
    НТУ "ХПИ", 2016
    Co-Authors: Виноградский, Дмитрий Георгиевич
    Abstract:

    Данная работа посвящена исследованию взаимного влияния соединений с натягом для вариантов соединений с натягом: сплошной вал с двумя втулками, два сплошных вала с втулкой, пустотелый вал с двумя втулками, два пустотелых вала с втулкой в ПК ANSYS. Получены характеристики НДС (эквивалентные напряжения, контактные давления, суммарные перемещения) в зависимости от величины интервала между соединениями с натягом. Установлено, что по мере увеличения этого интервала характеристики НДС сначала интенсивно изменяются, затем стабилизируются при достижении некоторого значения интервала. Подобная закономерность имеет характерные особенности для каждого типа соединений. Каждое из двух соединений с натягом, входящих в данный тип соединений, идентично по своим характеристикам НДС. Полученные результаты согласуются с распределением напряжений в задаче Ляме о толстостенных цилиндрах и свидетельствуют о возможности применения принципа Сен-Венана к соединениям с натягом.This work is devoted to research of mutual influence of connections with a tightness of options for connections with a tightness: Solid Shaft with two hubs, two Solid Shaft sleeve, hollow Shaft with two hubs, two hollow Shaft sleeve PC ANSYS. The characteristics of the stress-strain state (equivalent stresses). The contact pressure of the total displacement, depending on the size of theinterval between the compounds with an interference fit. It was found that increasing the interval characteristics of the stress-strain state of the first change-intensive, then stabilize when it reaches a certain value range. A similar pattern has the characteristic features of each type of compound. Each of the two connections with a tightness, included in this type of connections are identical in their characteristics of the stress-strain state. These results are consistent with the stress distribution in the Lame of thick-walled cylinders and indicate the possibility of applying the principle of San-Venan compounds with an interference fit

  • Mutual influence of connections with a tightness and associated structural elements
    НТУ "ХПИ", 2016
    Co-Authors: Виноградский, Дмитрий Георгиевич
    Abstract:

    В рассматриваемой задаче предполагается, что у деталей соединения с натягом (вала и втулки) имеются сопряженные с ними конструктивные элементы, являющиеся их продолжениями. В силу этого НДС соединения с натягом воздействует на эти сопряженные конструктивные элементы, которые, в силу сопряженности, в свою очередь влияют на детали соединения с натягом. Анализируются 6 типов соединений с натягом, имеющих сопряженные с ними конструктивные элементы, для которых определяются компоненты НДС, характеризующие степень взаимного влияния соединений с натягом и конструктивных элементов.In this problem, it is assumed that the connection parts with interference (Shaft and bushing) are structural elements with them, which are their continuation. By virtue of this compound with stress-strain, state interference affects these conjugates structural elements that, by virtue of conjugation in turn affect the interference fit connection details. Analyzed six types of connections with a tightness that have associated with them the elements (I – bush console Solid Shaft, II – Solid Shaft with cantilever sleeve, III – bush console hollow Shaft, IV – hollow Shaft with cantilever sleeve, V - connection Type III to reduce the thickness of the Shaft and sleeve, VI - compound type IV with a reduction in the thickness of the Shaft and sleeve), which are determined by stress-strain state, characterizing the degree of mutual influence of connections with a tightness conjugate components