Owing to the small number of grains in the vertical direction of the ballast layer of a railway track, a discrete/continuum double-layer model is proposed: the upper layer (the ballast) is modelled by a discrete 3D-lattice of interacting grains whereas the infinite underlayer is a continuum linear elastic medium. The problem under consideration is the dynamic behaviour of this double-layer system under the action of a moving load. A parametric study concerning the underlayer stiffness, the load velocity and the grain size is conducted. A comparison with the continuum modelling is provided for realistic moving loads.

Dynamic behaviour of ballasted railway tracks: a discrete/continuous approach

Dynamic responses of the 2DOF electromagnetic vibration energy harvester through different electrical coil connections

Testing the reliability of the threshing unit is difficult and thus often neglected before the harvesting season, which can result in breakdown maintenance during peak harvesting time in difficult-to-access areas for sensor mounting. In this paper, the vibration analysis of the threshing condition of the combine harvester was performed by introducing the bracket for inaccessible locations. The Adash A4900 Vibrio M analyzer (Adash spol. s.r.o., Ostrava, Czech Republic) was used for a vibration signal measurement and the DDS Adash software was used for signal processing. The demodulated fast Fourier transform (FFT) root mean square (RMS) (500 Hz–16 kHz) method was used to evaluate the bearing condition and DDS Adash Fault Source Identification Tool (FASIT) technology was used to evaluate other mechanical conditions such as the looseness, misalignment, and unbalance of the threshing unit of the Massey Ferguson series of combine harvesters. Modal and random vibration analyses were performed on the bracket and components and compared to prevent the resonance phenomenon using the Ansys Software (Ansys, Inc., Canonsburg, PA, USA). The constrained modal analysis of the threshing drum was performed to observe the deformation. Decent results were obtained from the method used. The method was again validated by the tangential threshing test bench and successfully determined the bearing fault condition. The method used is an uncomplicated and effective way of performing the bearing analysis of the tangential unit of the combine harvester.

/pdf/vibration-analysis-of-a-roller-bearing-condition-used-in-a-1ynb2c6f.pdf

Vibration Analysis of a Roller Bearing Condition Used in a Tangential Threshing Drum of a Combine Harvester for the Smooth and Continuous Performance of Agricultural Crop Harvesting

This research is concerned with the impact of onboard passengers’ seating arrangement on the carbody flexural vibrations of a high-speed railway vehicle. In this regard, the previously developed passenger body-seat models are used to consider the dynamic influence of the passengers. The carbody is modeled using the Euler–Bernoulli beam model to evaluate its flexural deformation. The frequency-domain analysis demonstrates that the carbody behaves almost like a rigid body when the vehicle is full of passengers. It is established that the passengers' presence causes a 31% enhancement of the ride quality determined based on EN 12299 standard for a fully occupied vehicle compared with an empty car. A scaled model of a ratio of 1:24.5 of the Shinkansen vehicle is constructed for validation purposes. The experimental results exhibit a similar trend as found by the simulations in terms of the impact of the passengers’ distribution on the carbody flexural vibrations.

The effect of onboard passengers’ seating arrangement on the vertical ride comfort of a high-speed railway vehicle

The GPR antenna is installed on the high-speed railway tunnel detection vehicle through the detection device to carry out non-contact nondestructive and rapid detection of the lining condition. Through simulation calculation and field vibration test data analysis, the vibration characteristics of the detection device are obtained. Vibration excitation is applied to GPR antennas to explore the amplitude-frequency sensitivity of echo signal affected by vibration when GPR detects tunnel lining, thus as to provide a basis for mechanism design and vibration control strategy. Through the optimization of the material properties, structural design, and control program of the detection device, the vibration frequency and amplitude of the detection device are optimized, the adaptive adjustment stability of the control system is improved, and the quality of GPR detection data is enhanced.

Analysis on Vibration Characteristics and Suppression Strategy of Vehicle Mounted GPR Detection Device for Tunnel Lining

A vehicle-track rigid flexible coupling-dynamic model is established. The first five vertical vibration natural frequencies of system are solved. The medium wave track irregularities are taken as t...

https://journals.sagepub.com/doi/pdf/10.1177/1461348418813028

Car body vertical vibration analysis under track medium wave irregularity and the influence factors of ballast bed

The invention discloses an autonomous barrier avoiding tunnel lining detection device. The autonomous barrier avoiding tunnel lining detection device comprises a work platform (70) capable of moving,a lower end of a vault arm (10) is hinged with the work platform (70) through a first pin (11), the axis of the first pin (11) and the direction of the work platform (70) are parallel, an upper end ofthe vault arm (10) is connected with a geological radar (60), the vault arm (10) can realize telescoping, and the vault arm (10) is connected with a top arm swinging driving mechanism capable of driving the vault arm (10) to swing through taking the first pin (11) as an axis. The autonomous barrier avoiding tunnel lining detection device is advantaged in that the device is a great leap for a tunnel lining large-scale mechanical work mode, automatic operation is realized, the detection speed is substantially improved, the corresponding speed is fast, blind detection areas are a few, performance is stable, and the device is suitable for detecting common speed and high speed single/double line railway tunnels.

Autonomous barrier avoiding tunnel lining detection device

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Car body vertical vibration analysis under track medium wave irregularity and the influence factors of ballast bed

Autonomous barrier avoiding tunnel lining detection device