scholarly journals Study on Intelligent Compaction-Equipment Logistics Scheduling and Propagation Characteristics of Vibration Wave in Nonlinear Systems with Multistability Based on Field Test

Complexity ◽  
2020 ◽  
Vol 2020 ◽  
pp. 1-13
Author(s):  
Yixuan Han ◽  
Changwei Yang ◽  
Degou Cai ◽  
Hongye Yan ◽  
Hailing Zeng
Keyword(s):  
Nonlinear Systems ◽  
Vibration Energy ◽  
Filling Material ◽  
Construction Technology ◽  
Propagation Characteristics ◽  
Peak Acceleration ◽  
Energy Propagation ◽  
Intelligent Compaction ◽  
Vibration Wave ◽  
Construction Efficiency

The equipment scheduling and propagation characteristics of vibration wave from vibratory roller ⟶ filling material nonlinear systems with multistability are the core problems of subgrade intelligent construction technology, and the logistics scheduling of the equipment is directly related to the construction efficiency. Aiming at the shortages, one typical subgrade located at the Gu’an station of Beijing-Xiong’an city railway is selected to research and finish the field tests; some findings are shown as follows: first, some valuable suggestions about the logistics scheduling of intelligent equipment are proposed, which can break the barriers between the organizations and improve construction efficiency; second, when the vibration wave propagates from the vibratory roller ⟶ surface of filling material ⟶ different buried depths of filling material, the peak acceleration of vibration wave gradually decreases and is hyperbolic distribution approximately. At the same time, the sensitive of attenuation is shown as follows: Z<X ≈ Y, and the critical depth of vibration energy propagation is about 1.0 m. At the same time, the peak acceleration of vibration wave at the interface of different filling material layers exists in steps and is “side clock” distribution approximately with the increase in buried depth. Third, in the propagation process, with the increase in buried depth, the amplitude of fundamental, primary, secondary, until fifth harmonics decreases exponentially (R2>0.9), and the concrete functional relationship among different amplitudes of harmonics can be summarized as y = Ae−BX; fourth, the vibration energy is mainly concentrated near 10–30 Hz in the vibratory roller, but when the vibration wave propagates from vibratory roller⟶filling material, the vibration energy gradually decreases with the increase in depth, and the marginal spectrum gradually changes from one peak to two peaks, that is, 30–50 Hz and 50–100 Hz; fifth, the vibration energy in the vibrational wheel is distributed averagely in the compaction process, and the effective compaction time is two seconds, which will be helpful for revealing the propagation characteristics of vibration wave, optimizing the compaction quality control models and providing some support for the development of intelligent compaction theory of railway subgrade.

Correlation between vibration energy propagation characteristics and coupling method of electric guitar

2016 ◽  
Vol 2016 (0) ◽  
pp. 341
Author(s):  
Yuta SUZUKI ◽  
Naoki ITOH ◽  
Toru YAMAZAKI ◽  
Hiroki NAKAMURA ◽  
Toshimitsu TANAKA ◽  
...  
Keyword(s):  
Coupling Method ◽  
Vibration Energy ◽  
Propagation Characteristics ◽  
Energy Propagation ◽  
Electric Guitar

scholarly journals Study on the Transmission and Evolution Characteristics of Vibration Wave from Vibratory Roller to Filling Materials Based on the Field Test

2020 ◽  
Vol 10 (6) ◽  
pp. 2008
Author(s):  
Changwei Yang ◽  
Liang Zhang ◽  
Yixuan Han ◽  
Degou Cai ◽  
Shaowei Wei
Keyword(s):  
Frequency Domain ◽  
Fundamental Wave ◽  
Primary Wave ◽  
Compaction Process ◽  
Vibration Acceleration ◽  
Intelligent Compaction ◽  
Filling Materials ◽  
Evolution Characteristics ◽  
Attenuation Rate ◽  
Vibration Wave

Compaction quality of railroad subgrade relates directly to the stability and safety of train operation, and the core problem of the Intelligent Compaction of railroads is the transmission and evolution characteristics of vibration wave. Aiming at the shortages in exploring the transmission and evolution characteristics of the vibration signal, the typical subgrade compaction project of Jingxiong Intercity Railway Gu’an Station was selected to carry out the field prototypes tests, and the dynamic response from the vibratory roller to filling materials was monitored in the whole compaction process, and some efficient field tests data will be obtained. Based on this, the transmission and evolution characteristics of the vibration wave from the vibratory roller to filling materials in the compaction process are studied from the time domain, frequency domain, jointed time–frequency domain and energy domain by using one new signal analysis technology—Hilbert–Huang Transform. Some conclusions are shown as follows: first, the vibration acceleration peak gradually decreases with the increase of buried depth, and when the buried depth reaches 1.8 m, the vibration acceleration peak is closed to zero. At the same time, when the vibration wave propagates from the wheel to the surface of filling, the attenuation rate of acceleration gradually increases with the increase of rolling compaction times, while the attenuation rate of other layers in different buried depths gradually decreases. Second, the vibration wave contains fundamental wave and multiple harmonics, and the dominant frequency of the fundamental wave is nearly 21 Hz. With the increase of buried depth, the amplitude of fundamental, primary, secondary, until fifth harmonics decreases exponentially and the concrete functional relationship among different amplitudes of harmonics can be summarized as y = Ae−BX. Third, the vibration energy focuses on the fundamental wave and primary wave, which can increase with the increase of rolling compaction times, and when the rolling compaction time reaches five, their energy reaches maximum. However, when the filling reaches a dense situation, the energy of the primary wave gradually decreases. Therefore, the maximum rolling compaction time is five in the practical engineering applications, which will be helpful for optimizing the compaction quality control models and providing some support for the development of the Intelligent Compaction theory of railway subgrade.

scholarly journals Gob-Side Entry Retaining Involving Bag Filling Material for Support Wall Construction

2020 ◽  
Vol 12 (16) ◽  
pp. 6353
Author(s):  
Zhaowen Du ◽  
Shaojie Chen ◽  
Junbiao Ma ◽  
Zhongping Guo ◽  
Dawei Yin
Keyword(s):  
Field Tests ◽  
Filling Material ◽  
Construction Technology ◽  
Working Face ◽  
Support Resistance ◽  
Pillar Mining ◽  
High Production ◽  
Wall Construction ◽  
Thin Seam ◽  
Seam Mining

Gob-side entry retaining, also termed as non-pillar mining, plays an important role in saving coal resources, high production and efficiency, extending the service life of mine and improving the investment benefit. Herein, a gob-side entry retaining method involving the use of bag filling material for wall construction is proposed based on the thin seam mining characteristics. First, a gob-side entry retaining mechanical model is established, and the side support resistance of the 8101 working face is calculated. The mechanical properties of the bag material are investigated through experiments, and the construction technology of the gob-side entry retaining approach involving the use of bag filling material for wall construction is introduced. The deformation on the two sides, the roof and floor of the roadway, are simulated via numerical methods and monitored during field tests. The results show a small control range for the deformations and a good roadway retention effect, thereby proving the feasibility of the bag filling material for wall construction. This study provides a reference for the development of gob-side entry retaining mining for thin coal seams.

scholarly journals Vibration Isolation of Existing Buildings in Microvibration Traffic Environment

2019 ◽  
Vol 2019 ◽  
pp. 1-13
Author(s):  
Qian Xia ◽  
Wen-jun Qu ◽  
Yi-qing Li ◽  
Jin Zhao
Keyword(s):  
Vibration Isolation ◽  
Theoretical Calculations ◽  
Residential Buildings ◽  
Isolation Effect ◽  
Slab Thickness ◽  
Filling Material ◽  
Construction Technology ◽  
Existing Buildings ◽  
Isolation System ◽  
The Impact

In order to explore the impact of traffic environmental microvibration on buildings, this paper studies indoor vibration isolation, a method applicable to existing buildings. The vibration isolation scheme is designed based on the residential buildings adjacent to metro lines in Shanghai. By using the dynamic theory, the effective range of vibration isolation stiffness is analyzed. The effectiveness of the indoor vibration isolation method is verified through theoretical calculations and comparison of field measurements before and after isolation. A detailed numerical model is established to analyze the indoor isolation and the effect after parameter optimization from the slab thickness, filling material, and isolator stiffness. The results show that the isolation effect is proportional to the thickness of the total slab thickness of the isolation system and inversely proportional to the stiffness of the isolator. And when concrete is used as the filling material, the isolation effect is best. The isolation effect of the midspan position is better than that of the wall-floor junction. The vibration isolation effect is more obvious after the parameters are optimized. With its convenient construction technology, short cycle, and low cost, this method is worth promoting.

Vibration energy propagation analysis of shamisen by experiment statistical energy analysis

2017 ◽  
Vol 2017 (0) ◽  
pp. 403
Author(s):  
Yuta SUZUKI ◽  
Masaya MATSUNAGA ◽  
Hiroki NAKAMURA ◽  
Yoshiaki ITOH ◽  
Toshimitsu TANAKA ◽  
...  
Keyword(s):  
Energy Analysis ◽  
Vibration Energy ◽  
Statistical Energy Analysis ◽  
Energy Propagation ◽  
Propagation Analysis

scholarly journals An Analysis on the Construction Technology and Management of Water Resources and Hydropower Projects

2019 ◽  
Vol 2 (1) ◽  
Author(s):  
Yong Xiao ◽  
Jidong Chai ◽  
Shun Xiao
Keyword(s):  
Social Benefits ◽  
Construction Technology ◽  
Construction Quality ◽  
Construction Companies ◽  
Quality Of Water ◽  
Water Conservancy ◽  
Construction Efficiency ◽  
National Infrastructure ◽  
Construction Works

As an important national infrastructure, the construction quality of water conservancy and hydropower projects is not only related to people's production and life, but also directly linked to the development of the national economy. Therefore, ensuring the quality of construction works is of great significance. The construction quality of water conservancy and hydropower projects depends to a large extent on the level of construction technology. In addition, construction technology is also inextricably linked to construction efficiency and construction cost. Therefore, construction companies must pay attention to the construction technology management of water conservancy and hydropower projects, and adopt scientific and reasonable construction technology to ensure the project according to the actual situation of construction Quality, give full play to the economic and social benefits brought by the construction of water conservancy and hydropower projects.

Multifunctional Integration Equipment Design and Construction Technology Research

2013 ◽  
Vol 650 ◽  
pp. 359-363 ◽  
Author(s):  
Jing Bo Guo ◽  
Jun Chen ◽  
Jin Zhi Liu ◽  
Jing Chuan Niu
Keyword(s):  
Equipment Design ◽  
Construction Equipment ◽  
Tunnel Construction ◽  
Construction Technology ◽  
Technology Research ◽  
Subway Tunnel ◽  
New Thought ◽  
The Face ◽  
New Type ◽  
Construction Efficiency

In the face of situation that the overall technology of tunnel mechanization construction is relatively backward in our country in recent years, a new type of mechanization supporting construction equipment which is suitable for the national conditions of our country is developed, and the corresponding construction technology is formulated. The equipment that set many functions in one can effectively improve the subway tunnel construction efficiency and reduce cost, and it provides a kind of new thought for the acceleration of China's subway tunnel construction mechanization.

scholarly journals Construction technology and quality control of double layer continuous paving of cement stabilized macadam base

2020 ◽  
Vol 3 (3) ◽  
Author(s):  
Jin Ma
Keyword(s):  
Quality Control ◽  
Double Layer ◽  
New Technology ◽  
Construction Technology ◽  
Construction Quality ◽  
Lower Base ◽  
Contraction Joint ◽  
Interlayer Bonding ◽  
Construction Efficiency

Abstract: the construction method of continuous paving of the upper and lower base of the water stable macadam base can improve the construction efficiency, overcome the quality problems of the traditional layered paving of the upper and lower base, such as untimely curing, slow construction, poor interlayer bonding, contraction joint and interlayer, so as to ensure the construction quality of the water stable macadam. It is also the promotion and application of new technology.

scholarly journals Analysis of Application of Pile Foundation Technology in Construction Engineering

2018 ◽  
Author(s):  
Xiaoyu Si ◽  
Xiangru Zhao ◽  
Xiangru Zhao ◽  
Lihua Wang ◽  
Lihua Wang ◽  
...  
Keyword(s):  
Pile Foundation ◽  
Construction Projects ◽  
Rapid Development ◽  
Science And Technology ◽  
Construction Technology ◽  
Construction Engineering ◽  
Reform And Opening Up ◽  
Building Engineering ◽  
Construction Efficiency

Since the reform and opening up, China has invested a lot of painstaking efforts in the field of science and technology, which has greatly promoted the progress and development of science and technology in China. The rapid development of science and technology has effectively promoted the progress of all walks of life. In terms of construction industry, the application of advanced construction technology lays a technical foundation for the effective improvement of construction quality and construction efficiency. The following is the analysis of the application of pile surrounding construction technology in building engineering, and how to improve the quality of pile foundation construction. It is necessary to ensure that the construction technology of pile foundation can give full play to its advantages in construction engineering and meet the carrying demand of construction projects.

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