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Dynamical Analysis on Underground Powerhouse of Yixing Pumped-Storage Power Station Fang Han 1,2,a,Dongwang Zhong 1,2,b,Jiyun Mo1,2,c,Guijuan Chen1,2,d 1School of Science, Wuhan University of Science and Technology, Wuhan,430065, China, 2Hubei Province Key Laboratory of Systems Science in Metallurgical Process, Wuhan University of Science and Technology, Wuhan,430081, China ahanfang522@163.com, bzhongdw123@263.net, cmojiyun@hotmail.com, dchenguijuan@wust.edu.cn Keywords: underground powerhouse, pumped-storage power station, dynamical analysis, vibration response Abstract.
Basic material parameters are shown in Table1.
Table 1 Basic material parameters Material Elastic modulus/GPa Poisson ratio Bulk density/kg.m-3 steel 210 0.300 7 850 concrete 28.0 0.167 2 500 rock 3.0 0.300 2 400 Fig.1 Finite element model of powerhouse Fig.2 Profiles of the finite element model Analysis of vibration characteristics The boundary conditions of the side wall upstream and downstream are simplified as the four models below in order to analyze the rock influence on the vibration frequency.
Acknowledgement This work was financially supported by the Natural Science Foundation of China (51108358 and 51174147) and Hubei Province Key Laboratory of Systems Science in Metallurgical Process (Y201304).
Journal of sound and vibration, Vol.300(2009),p.394.

Test materials and methods Test materials.
The porosities of the plasma-sprayed coatings of different ceramic materials are shown in Table 2.
The hardnesses of the plasma-sprayed coatings of different ceramic materials are shown in Table 5.
Acknowledgement National Natural Science Foundation of China (No. 50772044); Science and technology project of Fujian provincial education ministry (No.
JA12197); Natural Science Foundation of Fujian (No. 2014J01200).

Introduction Having a special feature of facture toughness despite the hardness, polycrystalline composite diamond (PCD) materials are widely used for cutting tools.
At the same time, many problems have been reported in processing the PCD by grinding or electrodischarge machining, since PCD itself is one of the most difficult to machine materials.
The authors have attempted in their previous researches to improve the efficiency in machining ferrous materials by giving various types of ultrasonic vibration modes to the electrode [2].
Suzuki, et al.: EDM properties of PCD materials using EC-PCD electrode, Proceedings of spring conference (2010) pp.539-540
Iwai, et al.: EDM properties of EC-PCD on shorter pulse condition using various electrode materials, Proceeding of JSPE spring conference (2011) pp.15-16

The roof-cladding is made by black palm fiber, which is beside bamboo and hardwood the dominating material in the structures.
One of the most fascinating facts about the reconstructed Mbaru Niang houses is that - beside some water protection cladding on the bottom elements below the ground floor – all required building materials can be harvested in close vicinity to the town.
Thus, the buildings can be considered as lighthouse projects regarding environmental footprint, which might seem logical given that their principal concept was developed without having the possibility to deliver building materials from far distance.
Asian Theatre Journal, vol. 22, no. 2 (Fall 2005). © 2005 by University of Hawai‘i Press [5] H.
Research Journal of Science & IT Management, Volume: 02, Number: 03, January-2013 [9] P.

Basic Theories on Cracking Cracking is a discontinuous phenomenon existing in the solid materials.
Create finite element model of XPS board thermal insulation of exterior wall and the model is shown in Fig.2, thermal parameters of materials are referred to the code for thermal design of civil buildings, and listed in Table 2.
Only in this way, the deformation of adjacent layer of the system will be almost the same when thermal stress produced once exterior insulation materials encounter quickly changed temperature difference
(In Chinese) [9] Xiuling Feng: Journal of North China Institute of Astronautic Engineering, 14,2 (2004), pp. 21-22.
(In Chinese) [10] Yuxin Chen, Maojun Wang, Yuanhua Zhu: submitted to Journal of Science & Technology, 09, (2009), pp. 77-78.

The ceramic composites are suitable as materials for MEMS parts in terms of the mechanical and physical properties.
A {TiN (+Ti2N)+Ti5Si3} or a (TiC+Ti5Si3) ceramics composites were obtained just by annealing above 1073 K in these materials.
Ameyama: Journal of Materials Processing Technology, 111 (2001), p. 118 [2] K.
Conf. on Advanced Materials and Processing, JIM, (2001), p. 959
Sugiyama: Journal of JSMS, 52(2003), p. 783

Wood1 1Department of Mechanical and Materials Engineering, University of Western Ontario, London, ON, Canada 2Canmet MATERIALS, Hamilton, ON, Canada Keywords: High pressure die casting, magnesium alloy AM60B, heat transfer coefficient Abstract.
A series of “top hat” castings were produced by high pressure die casting (HPDC) at Canmet MATERIALS in Hamilton, Ontario, Canada.
The literature confirms [6] that the IHTC is affected by alloy composition, pressure, initial die temperature, superheat, geometry of mold and die materials.
Benkel of the casting group at Canmet MATERIALS for their assistance in performing casting trials.
Weiler et al, “Variability of skin thickness in an AM60B magnesium alloy die-casting,” Materials Science and Engineering A, A419 (2006), 297-305

Different materials convey different ideas.
The first three materials are wood, but because of the different colors and textures, they give people different psychological feeling.
All materials are metal coupled with dark gray composite materials with arenaceous texture.
Mu: Journal of Guilin institute of electronic technology, Vol. 20 (2000) No.2. p.82~86.
He: Journal of Zhejiang University, (2010) No.4. p.715~721.

These are shown in Fig. 4(a) and Fig. 4(b), distinguishing the method of axis actuation and the materials in contact.
Wood, Advanced Functional Materials 2020, 30, 1908919
Yagüe-Fabra, Applied Sciences 2023, 13, DOI 10.3390/app13031937
Standard Guide for measuring and reporting friction coefficient.s, American Society for Testing and Materials, W.
Skonieczny, Journal of Terramechanics 2022, 99, 35-55

The 4 Mw biomass gasification referral circle power generation system developed by the Chinese Academy of Sciences Guangzhou Institute of Energy take husk, wood chips, straw and other biomass wastes for raw materials, its power generation efficiency is up to 20% ~ 28%, it can meet the rural agricultural waste handling needs.
Near term focus of China's bio-liquid fuel technology research and development direction is the use of non-food raw materials (mainly sweet sorghum, cassava and wood cellulose, etc.) of fuel ethanol production technology, as well as biodiesel technology of using Jatropha curcas and other oil crops as raw materials, and construction of large-scale raw material supply base and the establishment of biomass liquid fuel processing enterprises.
At present, the small-scale experiments of fuel ethanol based sweet sorghum and cassava and biodiesel taken jatropha as raw materials have been carried out, they accumulated experience for our large-scale development and utilization of bio-liquid fuel.
At the same time, some of our companies are researching and developing bio-liquid fuel technology taken straw, wood and other non-food for raw materials, and have made some breakthroughs, the large-scale production capacity are expected in 2012 about.
[4] Yuping Dong, Lipeng Wang and Bo Deng: Journal of Shandong University (Engineering Science), Vol. 37 (2007) No.3, p. 64 (In Chinese)