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A feasibility study on the design and walking operation of a biped locomotor via dynamic simulation

null

《机械工程前沿（英文）》 2016年 第11卷 第2期   页码 144-158 doi: 10.1007/s11465-016-0391-0

摘要：

A feasibility study on the mechanical design and walking operation of a Cassino biped locomotor is presented in this paper. The biped locomotor consists of two identical 3 degrees-of-freedom tripod leg mechanisms with a parallel manipulator architecture. Planning of the biped walking gait is performed by coordinating the motions of the two leg mechanisms and waist. A three-dimensional model is elaborated in SolidWorks® environment in order to characterize a feasible mechanical design. Dynamic simulation is carried out in MSC.ADAMS® environment with the aims of characterizing and evaluating the dynamic walking performance of the proposed design. Simulation results show that the proposed biped locomotor with proper input motions of linear actuators performs practical and feasible walking on flat surfaces with limited actuation and reaction forces between its feet and the ground. A preliminary prototype of the biped locomotor is built for the purpose of evaluating the operation performance of the biped walking gait of the proposed locomotor.

关键词： feasibility study     biped locomotor     biped walking     mechanical design     dynamic simulation     tripod leg mechanism     3-UPU parallel manipulator    

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A feasibility study of the measuring accuracy and capability of wireless sensor networks in tunnel monitoring

Xiaojun LI, Zhong JI, Hehua ZHU, Chen GU

《结构与土木工程前沿（英文）》 2012年 第6卷 第2期   页码 111-120 doi: 10.1007/s11709-012-0150-1

摘要： Fire disasters and the deterioration of tunnel structures are major concerns for tunnel operation and maintenance. Traditional wired monitoring systems have many drawbacks in terms of installation time, overall cost, and flexibility in tunnel environments. In recent years, there has been growing interest in the use of wireless sensor networks (WSNs) for the monitoring of various structural monitoring applications. This paper evaluated the feasibility of applying a WSN in the monitoring of tunnels. The monitoring requirements of tunnels under explosion and combustion fire scenarios are analyzed using numerical simulation, and the maximum possible distance for temperature sensors is derived. The displacement monitoring of tunnels using an inclinometer is investigated. It is recommended that the inclinometer should be installed in the 1/4 span of the tunnel structure. The maximum wireless transmission distances in both outdoor and tunnel environments were examined. The influences of surface materials and sensor node locations on the data transmission distance in tunnel environments were also investigated. The experimental results show that the data loss in tunnel environments is approximately three times that in outdoor environments. Surface material has a considerable influence on the transmission distance of radio signals. The distance is 25 ? 28 m for a raw concrete surface, 20 m for a brick surface, and 36 m for a terrazzo surface. The transmission distances along the middle of quarter points are approximately 0.9 ( is the transmission distance in the center of the tunnel), and the relative error is less than±3%. The transmission distances at different locations along the bottom exhibit significant differences, decreasing from the middle to the corner point, with distances of approximately 0.8 at the quarter points and minimum distances of approximately 0.55 at the corner points.

关键词： wireless sensor network (WSN)     tunnel     monitoring     feasibility study    

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Environment and economic feasibility of municipal solid waste central sorting strategy: a case study

Hua ZHANG, Zongguo WEN, Yixi CHEN

《环境科学与工程前沿（英文）》 2016年 第10卷 第4期 doi: 10.1007/s11783-016-0852-z

摘要： The Green House program reduced the amount of waste by 34%. The Green House is now running with a monthly loss of 1982 CNY. Involve government, expand scale, use professional technology are main suggestions. Improved program can reduce the amount of waste by 37% (33.8 tons monthly). Improved program can flip the loss into a profit worth 35034 CNY monthly. Although Beijing has carried out municipal solid waste (MSW) source separation since 1996, it has largely been ineffective. In 2012, a “Green House” program was established as a new attempt for central sorting. In this study, the authors used material flow analysis (MFA) and cost benefit analysis (CBA) methods to investigate Green House’s environment and economic feasibility. Results showed that the program did have significant environmental benefits on waste reduction, which reduced the amount of waste by 34%. If the Green House program is implemented in a residential community with wet waste ratio of 66%, the proportion of waste reduction can reach 37%. However, the Green House is now running with a monthly loss of 1982 CNY. This is mainly because most of its benefits come from waste reduction (i.e., 5878 CNY per month), which does not turn a monetary benefit, but is instead distributed to the whole of society as positive environmental externalities. Lack of government involvement, small program scale, and technical/managerial deficiency are three main barriers of the Green House. We, thus, make three recommendations: involve government authority and financial support, expand the program scale to separate 91.4 tons of waste every month, and use more professional equipment/technologies. If the Green House program can successfully adopt these suggestions, 33.8 tons of waste can be reduced monthly, and it would be able to flip the loss into a profit worth 35034 CNY.

关键词： Environment and economic feasibility     Municipal solid waste (MSW)     Waste central sorting     Green House    

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Feasibility study on simultaneous removal of sulfur and trace selenium in the MTD-FGD reactor

LI Yuzhong, TONG Huiling, ZHUO Yuqun, LI Yan, CHEN Changhe, XU Xuchang

《能源前沿（英文）》 2007年 第1卷 第3期   页码 259-263 doi: 10.1007/s11708-007-0036-4

摘要： This study deals with the simultaneous removal of sulfur dioxide (SO) and trace selenium dioxide (SeO) from flue gas by calcium oxide (CaO) adsorption in the moderate temperature range, especially the feasibility of simultaneous removal of these two pollutants in a moderate temperature dry flue gas desulfurization (MTD-FGD) reactor. The effect of SO presence on selenium capture is studied through the experiments performed on a thermogravimetric analyzer (TGA) and the following conclusions can be obtained. When CaO conversion is relatively low and the reaction rate is controlled by chemical reaction kinetics, the SO presence does not affect selenium capture. When CaO conversion is very high and the reaction rate is controlled by product layer diffusion, the SO presence and the product layer diffusion resistance jointly reduce selenium capture. Through analyses of some pilot scale MTD-FGD tests, it can be concluded that in the MTD-FGD reactor, the sulfate reaction of sorbent particles is generally kinetically controlled. Therefore, it is feasible that sulfur and trace selenium can be simultaneously removed by Ca-based sorbent in the MTD-FGD reactor.

关键词： Ca-based sorbent     product     feasibility     thermogravimetric analyzer     simultaneous removal    

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利用工业废渣制备软土固化剂的可行性探讨

戴蕾,李战国,黄新

《中国工程科学》 2010年 第12卷 第3期   页码 56-60

摘要：

就如何高附加值地利用工业废渣制备软土固化剂进行了技术效果、经济效益及生产方式等方面的可行性探讨。基于固化土结构形成过程的特点及其对固化剂组成的特殊需求，提出了利用工业废渣制备固化剂的设计思想，给出了固化剂配比实例，与水泥进行了性价比对比分析，并初步探讨了利用工业废渣产业化生产固化剂宜采取的生产经营方式。认为只要能根据形成固化土结构对固化剂组成材料的特殊需求针对性地选择适当的工业废渣，就能够制备出高性价比的软土固化剂；宜根据拟加固土的性质个性化设计制备固化剂，采用多组分组配式生产方式以及设计、生产、销售一体化的经营模式。

关键词： 工业废渣     软土固化     固化剂     可行性     性价比    

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Experimental investigation and feasibility analysis of a thermophotovoltaic cogeneration system in high-temperature

Jianxiang WANG, Hong YE, Xi WU, Hujun WANG, Xiaojie XU

《能源前沿（英文）》 2013年 第7卷 第2期   页码 146-154 doi: 10.1007/s11708-013-0253-y

摘要： The experimental - characteristics of a Si cell module in a thermophotovoltaic (TPV) system were investigated using SiC or Yb O radiator. The results demonstrate that the short-circuit current increases while the open-circuit voltage, along with the fill factor, decreases with the cell temperature when the radiator temperature increases from 1273 to 1573 K, leading to a suppressed increase of the output power of the system. The maximum output power density of the cell module is 0.05 W/cm when the temperature of the SiC radiator is 1573 K, while the electrical efficiency of the system is only 0.22%. The efficiency is 1.3% with a Yb O radiator at the same temperature, however, the maximum output power density drops to 0.03 W/cm . The values of the open-circuit voltage and the maximum output power obtained from the theoretical model conform to the experimental ones. But the theoretical short-circuit current is higher because of the existence of the contact resistance inside the cell module. In addition, the performance and cost of TPV cogeneration systems with the SiC or Yb O radiator using industrial high-temperature waste heat were analyzed. The system electrical efficiency could reach 3.1% with a Yb O radiator at 1573 K. The system cost and investment recovery period are 6732 EUR/kWel and 14 years, respectively.

关键词： thermophotovoltaic (TPV)     industrial waste heat     ytterbium oxide     system efficiency    

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Technical feasibility study of an onshore ballast water treatment system

Shengjie LIU, Manxia ZHANG, Xiang LI, Xiaojia TANG, Lingling ZHANG, Yimin ZHU, Chengyu YUAN

《环境科学与工程前沿（英文）》 2011年 第5卷 第4期   页码 610-614 doi: 10.1007/s11783-011-0379-2

摘要： To fulfill the requirements of (G8), a set of onshore ballast water treatment equipment utilizing micro-pore ceramic filtration (MPCF) and UV radiation (MPCF&UV) system was designed and set up with a maximum flow rate of 80 m ·h . Technical feasibilities of MPCF&UV system were evaluated in three areas: removal efficiencies of indicator organism and oceanic bacteria, perdurability of a ceramic filter, and application on native seawater. The results showed that no indicator organism ( ) or oceanic bacteria was detected after treatment of 20 L MPCF and UV radiation at 1.3× 10 μW·s·cm . A 20 L ceramic filter can run continuously for 5.3 h at the flow rate of 15 m ·h before its pressure drop up to 0.195 MPa. The removal percentage of total plankton amounts were 91.9% at a flow rate of 70 m ·h by 80 L MPCF and UV radiation at 1.3× 10 μW·s·cm .

关键词： ballast water     ceramic filter     UV     plankton     oceanic bacteria    

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capture for decarbonisation of energy-intensive industries: a comparative review of techno-economic feasibility

《化学科学与工程前沿（英文）》 2022年 第16卷 第9期   页码 1291-1317 doi: 10.1007/s11705-022-2151-5

摘要： Carbon capture and storage will play a crucial role in industrial decarbonisation. However, the current literature presents a large variability in the techno-economic feasibility of CO2 capture technologies. Consequently, reliable pathways for carbon capture deployment in energy-intensive industries are still missing. This work provides a comprehensive review of the state-of-the-art CO2 capture technologies for decarbonisation of the iron and steel, cement, petroleum refining, and pulp and paper industries. Amine scrubbing was shown to be the least feasible option, resulting in the average avoided CO2 cost of between 62.7 €·tCO2−1 for the pulp and paper and 104.6 €·tCO2−1 for the iron and steel industry. Its average equivalent energy requirement varied between 2.7 (iron and steel) and 5.1 MJth⋅kgCO2−1 (cement). Retrofits of emerging calcium looping were shown to improve the overall viability of CO2 capture for industrial decarbonisation. Calcium looping was shown to result in the average avoided CO2 cost of between 32.7 (iron and steel) and 42.9 €·tCO2−1 (cement). Its average equivalent energy requirement varied between 2.0 (iron and steel) and 3.7 MJth⋅kgCO2−1 (pulp and paper). Such performance demonstrated the superiority of calcium looping for industrial decarbonisation. Further work should focus on standardising the techno-economic assessment of technologies for industrial decarbonisation.

关键词： industrial CO2 emissions     CCS deployment     carbonate looping     net-zero industry     carbon capture benchmarks    

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The feasibility of coating by cooling crystallization on ibuprofen naked tablets

Fatima Mameri, Ouahiba Koutchoukali, Mohamed Bouhelassa, Anne Hartwig, Leila Nemdili, Joachim Ulrich

《化学科学与工程前沿（英文）》 2017年 第11卷 第2期   页码 211-219 doi: 10.1007/s11705-017-1619-1

摘要： Sugar spray coating is a frequently used process in the pharmaceutical industry. However, this process presents the disadvantage to form an amorphous coating around the active ingredient. A crystalline coating formed on the surface of a tablet is highly desirable. Recently, a new process of coating by cooling crystallization has been developed and applied on bisacodyl pastilles obtained by melt crystallization. In this work, we investigated the feasibility of coating by cooling crystallization on ibuprofen “naked tablets” manufactured by compression. In the first part of this work, the solubility and the metastable zone width have been determined experimentally for the coating solution because they are essential factors for any crystallization process. In the second part, the coating process is investigated on the operating conditions that affect the surface morphology and the crystal growth rate. These experimental conditions include concentration of the coating solution, degree of sub-cooling, agitation speed, retention time, and surface properties of the naked ibuprofen tablets. The results show that naked tablet coating by cooling crystallization is feasible and can be applied in the pharmaceutical industry.

关键词： coating     solution crystallization     ibuprofen tablets     sucrose    

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我国西部天然气东输的可行性

邱中建

《中国工程科学》 1999年 第1卷 第1期   页码 94-98

摘要：

我国西部天然气资源十分丰富，占全国天然气总资源量的75%、探明储量的80%，已累计探明储量达13 110×108m3,西部地区已有能力长期稳定年外输气150×108m3。西气东输塔里木天然气有决定意义，目前正在评价的新发现的两个大型气田预计可迅速新增天然气探明储量约5 000×108m3。这些气田储量丰度大，单井产量高，采气成本低。东部长江三角洲地区经济发达，能源短缺，自给率仅为13%，目前能源消费构成中煤炭占76%，城市环境污染严重，是天然气消费的巨大市场。预计2010年天然气需要量253×108m3。西气东输有两个方案，一是塔里木气单独东输，开始年输量100×108m3，第八年开始增加至150×108m3；二是西部诸盆地联合东输，开始年输量150×108m3，第八年开始增加至230×108m3。两个方案均有经济效益，以联合东输方案优点较多。天然气在上海门站每立方米的销售价为1.2～1.3元，是很有竞争力的。项目一旦启动，对东部及西部地区均会带来巨大的好处。

关键词： 西部     天然气     东输     可行性    

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Evaluation of the technoeconomic feasibility of electrochemical hydrogen peroxide production for decentralized

Yang Li, Yixin Zhang, Guangshen Xia, Juhong Zhan, Gang Yu, Yujue Wang

《环境科学与工程前沿（英文）》 2021年 第15卷 第1期 doi: 10.1007/s11783-020-1293-2

摘要： Abstract • Gas diffusion electrode (GDE) is a suitable setup for practical water treatment. • Electrochemical H2O2 production is an economically competitive technology. • High current efficiency of H2O2 production was obtained with GDE at 5–400 mA/cm2. • GDE maintained high stability for H2O2 production for ~1000 h. • Electro-generation of H2O2 enhances ibuprofen removal in an E-peroxone process. This study evaluated the feasibility of electrochemical hydrogen peroxide (H2O2) production with gas diffusion electrode (GDE) for decentralized water treatment. Carbon black-polytetrafluoroethylene GDEs were prepared and tested in a continuous flow electrochemical cell for H2O2 production from oxygen reduction. Results showed that because of the effective oxygen transfer in GDEs, the electrode maintained high apparent current efficiencies (ACEs,>80%) for H2O2 production over a wide current density range of 5–400 mA/cm2, and H2O2 production rates as high as ~202 mg/h/cm2 could be obtained. Long-term stability test showed that the GDE maintained high ACEs (>85%) and low energy consumption (<10 kWh/kg H2O2) for H2O2 production for 42 d (~1000 h). However, the ACEs then decreased to ~70% in the following 4 days because water flooding of GDE pores considerably impeded oxygen transport at the late stage of the trial. Based on an electrode lifetime of 46 days, the overall cost for H2O2 production was estimated to be ~0.88 $/kg H2O2, including an electricity cost of 0.61 $/kg and an electrode capital cost of 0.27 $/kg. With a 9 cm2 GDE and 40 mA/cm2 current density, ~2–4 mg/L of H2O2 could be produced on site for the electro-peroxone treatment of a 1.2 m3/d groundwater flow, which considerably enhanced ibuprofen abatement compared with ozonation alone (~43%–59% vs. 7%). These findings suggest that electrochemical H2O2 production with GDEs holds great promise for the development of compact treatment technologies for decentralized water treatment at a household and community level.

关键词： Advanced oxidation process     Electro-peroxone     Gas diffusion electrode     Hydrogen peroxide     Oxygen reduction    

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Fuel poverty and low carbon emissions: a comparative study of the feasibility of the hybrid renewable

《能源前沿（英文）》 2022年 第16卷 第2期   页码 336-356 doi: 10.1007/s11708-021-0748-x

摘要： Fuel poverty is most prevalent in North East England with 14.4% of fuel poor households in Newcastle upon Tyne. The aim of this paper was to identify a grid connected renewable energy system coupled with natural gas reciprocating combined heat and power unit, that is cost-effective and technically feasible with a potential to generate a profit from selling energy excess to the grid to help alleviate fuel poverty. The system was also aimed at low carbon emissions. Fourteen models were designed and optimized with the aid of the HOMER Pro software. Models were compared with respect to their economic, technical, and environmental performance. A solution was proposed where restrictions were placed on the size of renewable energy components. This configuration consists of 150 kW CHP, 300 kW PV cells, and 30 kW wind turbines. The renewable fraction is 5.10% and the system yields a carbon saving of 7.9% in comparison with conventional systems. The initial capital investment is $1.24 million which enables the system to have grid sales of 582689 kWh/a. A conservative calculation determined that 40% of the sales can be used to reduce the energy cost of fuel poor households by $706 per annum. This solution has the potential to eliminate fuel poverty at the site analyzed.

关键词： greenhouse gas control     low carbon target     grid connected     renewable fraction     fuel poverty     combined heat and power     HOMER Pro    

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建筑市场招投标合谋防范体系的构建—基于防范措施有效性和可行性的分析

秦旋,汪静,詹朝曦

《中国工程科学》 2013年 第15卷 第10期   页码 103-12

摘要：

我国建筑领域招投标市场中的合谋行为破坏了正常的招投标秩序，如何有效地治理招投标市场中的合谋行为，促进招投标市场的健康发展是本文研究的目的。基于目前常用的36项防范措施的有效性和可行性在工程界展开问卷调查，针对112份有效问卷的调查数据进行统计分析，得出工程领域被调查专家对合谋防范措施有效性和可行性的看法。结果显示：36项防范措施普遍存在有效性高于可行性，可行性差是制约防范措施发挥作用的重要因素。在此基础上，针对有效性高的措施，整合构建出我国建筑市场招投标合谋防范体系，为防范招投标合谋行为提供有益的政策建议。

关键词： 建筑市场     招投标合谋     问卷调查     防范措施     防范体系     有效性     可行性    

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Product lifecycle-oriented virtual assembly technology

LIU Jian-hua, NING Ru-xin, YAO Jun, WAN Bi-le

《机械工程前沿（英文）》 2006年 第1卷 第4期   页码 388-395 doi: 10.1007/s11465-006-0045-8

摘要： VA (virtual assembly) provides a more efficient, intuitive and convenient method for assembly process modeling, simulation and analysis. Previous researches about VA are almost isolated and dispersive, and have not established the understanding and definition of VA from a macroscopical and integrated view. Based on the analysis of the connotations of VA, a PLO-VATA (product lifecycle-oriented virtual assembly technology architecture) is proposed, in this architecture, VA is decomposed into four basic elements: principles and methodology of DFA (design for assembly), assembly analysis and evaluation, virtual assembly model and virtual assembly toolkits. Immersion, concurrence, integration and collaboration are the four main characteristics of VA being put forward. The key techniques of VA including virtual assembly model, virtual assembly analysis and evaluation, and virtual assembly process planning are discussed. Finally, a prototype system is built to validate the feasibility of the proposed method.

关键词： integrated     concurrence     feasibility     dispersive     assembly technology    

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Studies on advanced water-cooled reactors beyond generation III for power generation

CHENG Xu

《能源前沿（英文）》 2007年 第1卷 第2期   页码 141-149 doi: 10.1007/s11708-007-0018-6

摘要： China s ambitious nuclear power program motivates the country s nuclear community to develop advanced reactor concepts beyond generation III to ensure a long-term, stable, and sustainable development of nuclear power. The paper discusses some main criteria for the selection of future water-cooled reactors by considering the specific Chinese situation. Based on the suggested selection criteria, two new types of water-cooled reactors are recommended for future Chinese nuclear power generation. The high conversion pressurized water reactor utilizes the present PWR technology to a large extent. With a conversion ratio of about 0.95, the fuel utilization is increased about 5 times. This significantly improves the sustainability of fuel resources. The supercritical water-cooled reactor has favorable features in economics, sustainability and technology availability. It is a logical extension of the generation III PWR technology in China. The status of international R&D work is reviewed. A new supercritical water-cooled reactor (SCWR) core structure (the mixed reactor core) and a new fuel assembly design (two-rows FA) are proposed. The preliminary analysis using a coupled neutron-physics/thermal-hydraulics method is carried out. It shows good feasibility for the new design proposal.

关键词： Chinese situation     selection     generation     water-cooled     feasibility    

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标题 作者 时间 类型 操作

A feasibility study on the design and walking operation of a biped locomotor via dynamic simulation

null

期刊论文

A feasibility study of the measuring accuracy and capability of wireless sensor networks in tunnel monitoring

Xiaojun LI, Zhong JI, Hehua ZHU, Chen GU

期刊论文

Environment and economic feasibility of municipal solid waste central sorting strategy: a case study

Hua ZHANG, Zongguo WEN, Yixi CHEN

期刊论文

Feasibility study on simultaneous removal of sulfur and trace selenium in the MTD-FGD reactor

LI Yuzhong, TONG Huiling, ZHUO Yuqun, LI Yan, CHEN Changhe, XU Xuchang

期刊论文

利用工业废渣制备软土固化剂的可行性探讨

戴蕾,李战国,黄新

期刊论文

Experimental investigation and feasibility analysis of a thermophotovoltaic cogeneration system in high-temperature

Jianxiang WANG, Hong YE, Xi WU, Hujun WANG, Xiaojie XU

期刊论文

Technical feasibility study of an onshore ballast water treatment system

Shengjie LIU, Manxia ZHANG, Xiang LI, Xiaojia TANG, Lingling ZHANG, Yimin ZHU, Chengyu YUAN

期刊论文

capture for decarbonisation of energy-intensive industries: a comparative review of techno-economic feasibility

期刊论文

The feasibility of coating by cooling crystallization on ibuprofen naked tablets

Fatima Mameri, Ouahiba Koutchoukali, Mohamed Bouhelassa, Anne Hartwig, Leila Nemdili, Joachim Ulrich

期刊论文

我国西部天然气东输的可行性

邱中建

期刊论文

Evaluation of the technoeconomic feasibility of electrochemical hydrogen peroxide production for decentralized

Yang Li, Yixin Zhang, Guangshen Xia, Juhong Zhan, Gang Yu, Yujue Wang

期刊论文

Fuel poverty and low carbon emissions: a comparative study of the feasibility of the hybrid renewable

期刊论文

建筑市场招投标合谋防范体系的构建—基于防范措施有效性和可行性的分析

秦旋,汪静,詹朝曦

期刊论文

Product lifecycle-oriented virtual assembly technology

LIU Jian-hua, NING Ru-xin, YAO Jun, WAN Bi-le

期刊论文

Studies on advanced water-cooled reactors beyond generation III for power generation

CHENG Xu

期刊论文