欧盟热水器能效试验中对放水内能控制的研究

欧盟热水器能效试验不同于国标热水器标准的特征是能效测试过程需要进行放水,且放水过程不是一次性放水,该试验中关键是要解决对能效测试中放水内能的控制。对影响放水内能控制的测试系统数据采集速率、过程数据处理、试验过程控制三个方面进行了分析研究,提出了欧盟热水器能效试验的方案和放水内能控制策略,并应用到新建的一套欧盟热水器能效测试系统中。通过一台样机的试验数据对比,进一步验证和分析了放水内能控制精度在±2%范围。

中外电动机能效试验及评价标准的比较与研究

介绍了电动机的效率试验方法和评价方法,并利用具体试验结果将国际和国内的相关标准进行研究和比较,分析其差异。同时介绍了德国引进的电动机能效测试系统结构和应用。

高海拔地区输电线路典型施工机械能效试验与改进措施研究

高海拔地区输电线路建设的低压、低氧环境特点导致输电线路施工机械降效严重。为研究典型输电线路施工机械在高海拔地区的降效规律,提出整机输出功率的测量方案,于海拔3000~5000 m的高原地区测试输电线路施工机械的有效输出功率。根据试验结果分析施工机械关于海拔高度的降效规律,为高海拔地区输电线路施工机械的设计与使用提供参考依据。

换气扇能效试验不同装置测试结果差异的试验研究与分析

在换气扇能效测试中,常常出现不同测试装置对同一换气扇测试得到不同结果,有时甚至出现差异较大的现象。本文对这一问题进行了探讨,通过试验发现典型的出气风管与出气风室对离心式B型换气扇性能测试的影响,对引起差异的原因作了分析研究,在此基础上,对测试设备的适用性进行了评估分析,提出可供参考的减小差异的方法。

基于OBD接口的拖拉机电子油门控制装备设计与试验

本文提出了一种自动控制拖拉机电子油门的技术路线和装备,解决了在拖拉机PTO试验和能效等级评价试验中难以控制目标转速或其他需要稳定目标转速的问题。该实验设备的系统包括主控器、电源、按键(触摸屏)、OBD接口、油门接口,从OBD接口引出CAN线接到主控器,根据OBD协议来获取当前的内燃机的转速,再与目标转速比较,最后利用PWM技术模拟电子油门的输入,生成两路油门电压信号,且使内燃机实时转速维持目标转速上。试验表明,新研制的油门控制装备实现了用按键(触摸屏)根据实验情况来调整到目标转速,使转速稳定到目标转速。本文为提升拖拉机PTO试验和能效等级评价试验的准确性和可操作性提供了参考。

Anchoring effect and energy-absorbing support mechanism of large deformation bolt

To research the anchoring effect of large deformation bolt,tensile and drawing models are established.Then,the evolution laws of drawing force,bolt axial force and interfacial shear stress are analyzed.Additionally,the influence of structure element position on the anchoring effect of large deformation bolt is discussed.At last,the energy-absorbing support mechanism is discussed.Results show that during the drawing process of normal bolt,drawing force,bolt axial force and interfacial shear stress all gradually increase as increasing the drawing displacement,but when the large deformation bolt enters the structural deformation stage,these three values will keep stable;when the structure element of large deformation bolt approaches the drawing end,the fluctuation range of drawing force decreases,the distributions of bolt axial force and interfacial shear stress of anchorage section are steady and the increasing rate of interfacial shear stress decreases,which are advantageous for keeping the stress stability of the anchorage body.During the working process of large deformation bolt,the strain of bolt body is small,the working resistance is stable and the distributions of bolt axial force and interfacial shear stress are steady.When a rock burst event occurs,the bolt and bonding interface cannot easily break,which weakens the dynamic disaster degree.

Failure mechanism of Mesozoic soft rock roadway in Shajihai coal mine and its surrounding rock control

In view of the buckling failure caused by large deformation of Mesozoic soft rock roadway in Shajihai mining area, such as serious roof fall, rib spalling, floor heave, etc., based on the detail site investigation,theoretical analysis, mineral composition test, microstructure test, water-physical property test and field experiments were carried out. And we revealed the compound failure mechanism of Mesozoic soft rock roadway in Shajihai mining area, namely the molecule expansion-shear slip of weak structural plane-construction disturbance. On this basis, the coupling support technology whose core is constant resistance with large deformation bolt was proposed. The feature of this supporting technology is that a new type of structural composite material was used, which makes the supporting system not only has the ideal deformation characteristics, but also has high supporting resistance. Thus the fully release of plastic energy within surrounding rock and reasonable control of the thickness of the plastic ring were realized. Then the differential deformation between the surrounding rock and support was eliminated by the secondary coupling support of bolt–mesh–cable, and the bolt with high strength was applied in the base angle to control floor. Eventually the collaborative bearing system of surrounding rock–support was formed. Through field tests the validity and rationality of support was also verified.

ATLAS MSLB Accident Analysis Using the SPACE Code

An integral effect test for a MSLB （main stem line break） was performed with the ATLAS （advanced thermal-hydraulic test loop for accident simulation） by KAERI （Korea Atomic Energy Research Institute）. A MSLB is defined as a pipe break in the main steam system. This data was used to validate the safety analysis code SPACE （safety and performance analysis code for nuclear power plants）. In the test, a double-ended guillotined break of the main steam line was simulated. After steady-state was reached, the test was started by opening the break simulation valves. With the start of the test, the pressure of the secondary system decreased rapidly, and reached the set-point of the LSGP （low steam generator pressure） signal. With the occurrence of the LSGP signal, the main steam isolation valves were closed. The SIPs （safety injection pumps） were started by the LPP （low pressurizer pressure） signal. In order to validate the SPACE code, a double-ended guillotine break of the main steam line at ATLAS was simulated. Most of the results show good agreement between the experiment data and the code calculated values.

A combined experimental and theoretical investigation of donor and acceptor interface in efficient aqueous-processed polymer/nanocrystal hybrid solar cells

As a route to improving the energy conversion of organic-inorganic hybrid-solar cells, we have tested the performance of poly(phenylene vinylene)(PPV), poly(2,5-thienylene vinylene)(PWTV) polymers and CdTe nanocrystal devices produced via aqueous-processing. It is found that small differences in the conformation of the sensitizer lead to dramatic effects on the solar cell efficiency. Using a combination of UV-Vis absorption spectroscopy and first-principles non-adiabatic molecular dynamics(NAMD) based on time-dependent density-functional theory(TDDFT), PPV is found to have a longer electron injection and recombination time despite seeming to have a better energy alignment with the substrate, which leads to a higher devices performance than PWTV. The present results shed new light on the understanding of organic-inorganic hybrid-solar cells and will trigger further experimental and theoretical investigations.