Results 121 to 130 of about 32,294 (305)

Telegraph frequency noise in electromechanical resonators

, 2015
We demonstrate experimentally the possibility of revealing fluctuations in the eigenfrequency of a resonator when the frequency noise is of the telegraph type.
Chan, Ho Bun, Maizelis, Zakhar A., Sun, Fengpei, Zou, Jie   +3 more
core   +1 more source

Research on transmission characteristics and torsional vibration control of hybrid transmission wind turbines

Sustainable Energy Technologies and Assessments
Abstract As wind turbines become larger and move into deeper sea, their operating environment is getting more and more harsh, which puts higher stability requirements of the transmission chain. The mechanical-hydraulic hybrid transmission (MHHT) combines mechanical and hydraulic systems to improve transmission stability.
Fuquan Dai, Yonggang Lin, Yajing Gu, Hongwei Liu, Xiqing Cheng, Wenting Chen, Yong Sun   +6 more
openaire   +1 more source

Torsional vibration analysis of the power transmission system in a hydraulic rail engineering vehicle

机车电传动
Torsional vibration represents a crucial aspect of vibration in power transmission systems, especially for rail engineering vehicles featuring long power transmission pathways.
XU Kun, LUO Yaoxiang, ZHANG Yayu, LI Huawei   +3 more
doaj  

Mixed finite element models for free vibrations of thin-walled beams [PDF]

Simple, mixed finite element models are developed for the free vibration analysis of curved thin-walled beams with arbitrary open cross section. The analytical formulation is based on a Vlasov's type thin-walled beam theory with the effects of flexural ...
Min, Byung-Jin, Noor, Ahmed K., Peters, Jeanne M.   +2 more
core   +1 more source

Active Torsional Vibration Suppression Strategy for Power-Split-HEV Driveline System Based on Dual-Loop Control

Machines
Power-split hybrid electric vehicles (power-split-HEVs) exhibit significant engine torque fluctuations due to their mechanical coupling with the driveline, leading to pronounced torsional vibration issues in the drive shaft.
Wei Zhang, Xiaocong Liang, Zhengda Han, Lei Bu, Jingang Liu, Bing Fu, Mozhang Jiang   +6 more
doaj   +1 more source

Engine/airframe interface dynamics experience [PDF]

Problems of engine/drive system torsional stability, engine and output shaft critical speeds, and engine vibration at helicopter rotor order frequencies are discussed, and test data and analyses presented.
Fredrickson, C.
core   +1 more source

Torsional Vibration Characterization of Hybrid Power Systems via Disturbance Observer and Partitioned Learning

Energies
The series–parallel hybrid powertrain combines the advantages of both series and parallel configurations, offering optimal power performance and fuel efficiency. However, the presence of multiple excitation sources significantly complicates the torsional
Tao Zheng, Hui Xie, Boqiang Liang
doaj   +1 more source

Modal analysis of multistage gear systems coupled with gearbox vibrations [PDF]

An analytical procedure to simulate vibrations in gear transmission systems is presented. This procedure couples the dynamics of the rotor-bearing gear system with the vibration in the gear box structure. The model synthesis method is used in solving the
Choy, F. K., Ruan, Y. F., Townsend, D. P., Tu, Y. K., Zakrajsek, J. J.   +4 more
core   +1 more source

Investigation of Axial–Torsional Vibration Characteristics and Vibration Mitigation Mechanism in Compound Percussive Drilling

Applied Sciences
Severe drill string vibrations, particularly stick–slip, significantly compromise drilling efficiency and tool longevity in deep hard formations. Compound percussive drilling (CPD) has emerged as a promising technique to mitigate these vibrations and enhance the rate of penetration (ROP).
Wei Wang, Boyu Guo, Gonghui Liu, Chunqing Zha, Tian Chen, Jun Li   +5 more
openaire   +1 more source

Work Versus Force: Simultaneous Processes for Describing Interactions

Advanced Physics Research, EarlyView.
ABSTRACT Achieving a unified description of interactions remains an open challenge in theoretical physics, which currently describes four fundamental forces. This situation may be viewed differently when interactions are formulated in terms of processes (work as actio) rather than forces (force as actio), not only at the macroscopic level but also at ...
Grit Kalies, Duong D. Do, Cornelia Breitkopf   +2 more
wiley   +1 more source