Results 21 to 30 of about 126,623 (266)

考虑建筑群-沉积盆地动力相互作用的建筑群震害评估方法

Dizhen xuebao
我国大量城镇位于沉积盆地，沉积盆地对地震动具有显著的幅值放大和持时增长效应，同时沉积盆地与建筑群间的动力相互作用将导致地震动空间重分布。针对此问题，本文提出了一种考虑建筑群-沉积盆地动力相互作用的建筑群震害评估方法：首先，以剪切层模型、弯剪耦合模型等简化力学模型模拟建筑结构，计算建筑群-沉积盆地动力相互作用，获得建筑群的基础顶面地震动；然后，基于精细化有限元模型分析典型单体建筑的地震易损性；最后，结合所求建筑群基础顶面地震动、易损性曲线进行建筑群震害评估。结果表明：采用简化力学模型 ...
Zhongxian Liu, Sibo Meng, Yu Zhang, Yunfan Qiao, Longwei Chen   +4 more
doaj   +1 more source

Electromagnetic Force Induced Structural Vibration Analysis and Experiment of Brushless Direct Current Motors for Operating Speed Range

Applied Sciences, 2022
In this study, an electromagnetic force induced structural vibration for a brushless direct current (BLDC) motor with variable speed is performed using finite element analysis, as well as an experiment for operating speed range.
Seunghyeon Cho, Kyunghun Jeon, Ki-Deok Lee, Chang-Wan Kim   +3 more
doaj   +1 more source

Vibration Characteristics of the Rotating Dental Instrument [PDF]

Journal of Dental Research, 1950
Peer Reviewed ; http://deepblue.lib.umich.edu/bitstream/2027.42/66747/2/10.1177_00220345500290050801 ...
Henry, Edwin Ernest., Peyton, Floyd Avery   +1 more
openaire   +3 more sources

Flutter Prediction Method for Long Blade of Steam Turbine

发电技术, 2021
A three-dimensional fluid-solid coupling calculation model of long blade of steam turbine was established based on the aerodynamic and structural vibration simulation platform. Taking the second last stage blade of a foreign 60Hz steam turbine unit as an
Changchun LIU, Chun GUAN, Kuijun GUO, Yufeng LI, Yiliang MA   +4 more
doaj   +1 more source

Vibrational characteristics of Balinese gamelan metallophones [PDF]

The Journal of the Acoustical Society of America, 2010
A study of the eight metallophone pairs from a Balinese gamelan semara dana has been conducted. Acoustical recordings of metallophone bars being struck were used to examine ratios of overtone frequencies to the fundamental. Results showed large variability in the number and ratios of overtones present.
Molly E, Jones, Kent L, Gee, Jeremy, Grimshaw   +2 more
openaire   +2 more sources

Assessment of comfort index (CI) based on vibration characteristics in CNG control system development

Results in Engineering
Compressed Natural Gas (CNG) is an environmentally friendly alternative fuel that is affordable with high octane value. Although numerous preliminary studies have been developed about CNG, none examines engine vibrations on human body comfort.
Suroto Munahar, Muji Setiyo, Madihah Mohd Saudi, Azuan Ahmad, Alfin Anugrah Dhimas R, Muhamad Hardiansyah   +5 more
doaj   +1 more source

Development of contact detection method between tool cutting edge and workpiece (Influence of contact state onto vibration characteristics and contact detection during milling operation)

Journal of Advanced Mechanical Design, Systems, and Manufacturing, 2023
The contact between a tool and workpiece during machining has a significant effect on the vibration characteristics of machine tools. This study proposes a method for detecting contact between a tool and workpiece, and demonstrates applications of the ...
Yu IGARASHI, Ryuta SATO, Keiichi SHIRASE
doaj   +1 more source

Estimation of Elbow Wall Thinning Using Ensemble-Averaged Mel-Spectrogram with ResNet-like Architecture

Sensors, 2022
An elbow wall thinning diagnosis method by highlighting the stationary characteristics of the operating loop is proposed. The accelerations of curved pipe surfaces were measured in a closed test loop operating at a constant pump rpm, combined with curved
Jonghwan Kim, Byunyoung Chung, Junhong Park, Youngchul Choi   +3 more
doaj   +1 more source

Polarization‐resolved femtosecond Vis/IR spectroscopy tailored for resolving weak signals in biological samples using minimal sample volume

FEBS Open Bio, EarlyView.
Unique biological samples, such as site‐specific mutant proteins, are available only in limited quantities. Here, we present a polarization‐resolved transient infrared spectroscopy setup with referencing to improve signal‐to‐noise tailored towards tracing small signals. We provide an overview of characterizing the excitation conditions for polarization‐
Clark Zahn, Karsten Heyne
wiley   +1 more source

Integrated Impacts of Non-Ideal Factors on the Vibration Characteristics of Permanent Magnet Synchronous Motors for Electric Vehicles

Machines, 2022
The nonlinear electromagnetic vibration of the motor is a major factor that deteriorates the noise, vibration, and hardness (NVH) performance of a vehicle’s electric drive system.
Shuaishuai Ge, Longhui Qiu, Zhigang Zhang, Dong Guo, Honghai Ren   +4 more
doaj   +1 more source