[en] Theoretical basis of method of calculation mechanism's vibroisolation method of standing on the compliant foundations is given in the paper 'Vibration Mechanism's isolation Installed on the Compliant Base Part II'. Now let us consider the main statements of the engineering method of calculation. It is recommended to look up the vibration system without resonance first, and then vibration system on resonance. (author)

[en] This paper gives recent developments in ultrasonic motors using piezoelectric resonant vibration. Along with historical background, it also explains working principles and characteristics of different types of piezoelectric ultrasonic motor. The comparison between conventional electromagnetic motor and piezoelectric ultrasonic motor is also discussed. In the end, reliability issues are described with potential applications of the motor. (author)

[en] Propagation of axisymmetric and flexural modes in a transversely isotropic cylinder immersed in a fluid is studied. Dispersion and attenuation curves for cobalt as well as a magnesium cylinder is plotted. At immersed magnesium rod exhibits mode-switching. For a certain range of frequencies it also acts as a filter for the flexural modes. (author)

[en] The paper describes a sensor enabling the fast positioning on plane of rigid structures that may operate regardless amplitude and frequency of vibrations transmitted from the soil. The device promises good accuracy because based on a laser interferometric sensor. The use of a laser transducer enables also very fast measure acquisitions so that rigid structures can be vertically positioned automatically in a short time. (author)

[en] PulsESPI is a new method that integrates some of the advantages of both conventional pulsed holography and electronic speckle pattern interferometry. Owing to the possibility of the system to work on very short recording times (few nanoseconds), the PulsESPI is insensitive to disruptive factors like low frequency, vibrations of buildings or thermal schlieren. This paper describes the device and some typical applications to measure mechanical vibrations with high accuracy. (author)

[en] Sliding mode control of a planar flexible single-arm robot is the subject of this paper. These types of systems are used in material handling in remote and dangerous environments and in production lines. In the first part of the study, mathematical model of the system is described. The design of a Robot Controller should obviously have Robust character. Sliding modes control has been increasingly used in such applications. The most important problem in classical sliding modes control is the chattering problem. In such cases, the gear mechanism of the robot can be broken. Besides, the motor drive circuit may not supply these sudden changes of motor output. In the second part of this study, therefore, non-chattering sliding mode control has been introduced and it has been applied to the flexible robot arm. At the end of the study, the simulation and results are presented and discussed. (author)

[en] Large structures, such as high buildings, long span bridges, dams and towers etc., are characterized with low natural frequencies. Vibration measurement is a traditional and essential way for health monitoring and fault diagnosis in engineering. It may give a lot of useful information with regard to the dynamic characteristics of the structure. Besides, the stress status and, hence the local damage may also be detected if the displacement of vibration may be measured with accuracy of micrometers or even sub-micrometers. In the paper a new kind of seismic transducer will be introduced. Along with the high sensitivity and high resolution the transducer is inherent in high reliability and robustness. (author)

[en] A multiperiodic structure consists of repetition of periodic elements for example, periodic skin stringer structure used in aircrafts fuselage. The analysis of simple periodic structure is extended for compound periodic structure in this paper, using wave analysis approach. The characteristic waves are propagated along the structure and these are superimposed on each other. The propagation and attenuation bands are separated from each other and are discussed. (author)

[en] In-plane and out-of-plane vibrations of a frame having a curved member are studied. Although the analysis is carried out on a frame having a straight and a curve beam, it can be applicable for all the frame type structures. Different end conditions are considered for the system. Rotary inertia and extensional effects are included for the curved member. Finite element method is used as analysis tool. Natural frequencies of the curved beams for different end conditions are calculated first, and then the frequencies of the frames are investigated. The transformation from local coordinates to global coordinates for curved beams needs special attention in the analysis. The results are compared with other methods. (author)

[en] In resent years, it has become common practice to install dual non-contacting eddy current probes on critical high-speed turbo-machinery to avoid false shutdowns in the events that one of the probes should fail. The pickups are mounted radially in each bearing with the axis of the pickups separated by 90 deg. Some are mounted in the horizontal or vertical directions; others are mounted on an axis 45 deg. from the horizontal '10:30' and '1:30' clock positions. These same non contacting pickups can be hooked into an oscilloscope to provide Lissajous orbit patterns of the shaft's motion in the bearing. This text will deal with proper setup of the transducers and instrumentation required to produce Lissajous orbits. Some examples Lissajous are given and their the diagnosis of common machine problems is provided. The interpretation of JS plots will be the highlight of this text. (author)