共查询到19条相似文献,搜索用时 656 毫秒
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正交试验法在袋式高效空气过滤器设计中的应用 总被引:1,自引:1,他引:0
在一种低阻高效过滤器的试验研究中,根据技术指标提出了几种规格;利用正交试验方法设计了试验,以提高试验效率,保证试验结果的合理性。 相似文献
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介绍中国早期高效空气过滤器制造过程。原苏联提供了全套图纸和工艺文件,908厂利用国产材料研制出高效过滤器。1961年研制成功并批量制造第一批高效空气过滤器。1981年停止了老型号产品的生产。 相似文献
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吴振一暴海霞汤文良厉龙任豪 《洁净与空调技术》2021,(4):71-73
高效过滤器的过滤效率检测方法分为扫描法和总效率法。由于检测方法的不同,对高效空气过滤器的效率检测结果可能存在一定差异。通过实验获得了两种检测方案对高效空气过滤器的效率检测结果表明:对于无泄漏的过滤器用两种方法测试得到的过滤效率结果基本一致;当有过滤器有泄漏产生时,两种方法的检测结果产生较大差异,对测试结果偏差产生的原因进行了深入分析。 相似文献
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Particulate matter (PM) pollution in air is thought to be an important mortality risk factor globally. Most existing air filters face the extreme challenge of effectively removing PM0.3, which has the most penetration particle size (MPPS) of ≈0.3 µm yet is particularly harmful. Here, an innovative in situ electret electrospinning/netting technique that can manipulate both solution phase separation and crystal phase transition is reported to develop self‐polarized polyvinylidene fluoride nanofiber/net membranes with 2D networks and superior surface adhesion. By combining the true nanoscale diameter (≈21 nm), small pore size (≈0.26 µm), and highly electret surface (6.8 kV potential) of the 2D nanonets, the synergistic effect of sieving and adhesion for MPPS PM0.3 is achieved. Such double capture characteristic enables the high‐efficiency (≈99.998%) capture of PM0.3 while maintaining low air resistance (≈0.1% atmosphere pressure). Moreover, the nanofiber/net filters show integrated properties of superhydrophobicity, desirable transparency (91%), and long‐term stability. The synthesis of such attractive nanomaterials presents a promising attempt toward the development of high‐performance filtration/separation materials for numerous applications. 相似文献
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作为下一代移动通信系统的标准之一,TD-LTE越来越受到业界和通信厂家的关注。为了对TD-LTE系统的性能做定量指标的测试,需要有较为先进的测试平台和测试方法。为此一个开源的通用测试自动化平台Robot被引入,在此基础上通过开发适用于TD-LTE系统的关键字函数库对TD-LTE系统性能进行测试,并且通过这个测试自动化平台能进行自动的回归测试,不间断地对TD-LTE系统开发中的性能进行测量。通过测试自动化平台提供的日志报告,就能很直观地了解到当前TD-LTE系统的吞吐量性能指标,并对结果进行比较分析。 相似文献
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The purpose of this paper is to develop, design and test an overall approach to line side filter optimization for the current type PWM controlled active rectifier and to investigate influence of control system to converters performance and filter size (TkVA). For the instantly predominating offline current rectifier control methods, a line side filter optimization algorithm and corresponding computer program was proposed and developed. It uses both complete transient and steady state, characteristics of system, ensuring minimized individual and total harmonic distortion (according to standards) of line current and a good power factor together with minimum costs. Suggested method was numerically verified through the extensive simulations using SIMULINK toolbox of MATLAB software. Final verification came from the implementation on a prototype. Detailed testing was performed and the proposed algorithm showed satisfying performance under different operating conditions. As far as the authors are aware, the novel contribution coming from this paper is in completing the line side filter optimization algorithm taking into account both transient and steady state of system, power supply demands and the power factor restriction for the offline controlled current type AC/DC converter 相似文献
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As a consequence of technology scaling and increasing power consumption of modern high performance designs, various techniques, such as clock gating and Dynamic Voltage and Frequency Scaling (DVFS), have been adapted to address power issues. These techniques are important and desirable to address reliability needs as well as economic issues. From a testing point of view, the introduction of power constraints during testing is needed to achieve the desired product quality and to avoid yield loss. Unlike designers who have benefited from the Design-for-Test hardware introduced for testing, test engineers have rarely taken advantage of the extra hardware introduced to meet design needs. In this paper, we make use of the DVFS technology and its associated hardware to improve test economics. We formulate the power constrained testing problem as an optimization problem that makes use of DVFS technology. We show that superior test schedules can be obtained for both session-based and sessionless testing methods relative to existing and traditional methods of obtaining test schedules. 相似文献
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太阳模拟器作为航天科技卫星空间环境模拟和太阳能电池检测与标定的必要模拟设备,越来越受到人们的关注。太阳模拟器滤光片作为模拟器的核心部件,通过对模拟器光源滤光,可以得到不同的太阳光谱辐照度。文中研究的AM0滤光片通过对氙灯光源滤光,可以得到大气层表面的太阳光谱辐照度分布。根据标准AM0光谱辐照度曲线和标准氙灯辐照度曲线,得到AM0滤光片透过率曲线。在此基础上对滤光片进行膜系设计和镀制,得到了满足国标A类标准的AM0滤光片。对滤光片进行了紫外辐照实验和高温烘烤实验,研究了其光学稳定性,所镀制的滤光片光学稳定性优于目前使用的滤光片。 相似文献
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LCL滤波器在并联型有源电力滤波器中的设计 总被引:1,自引:0,他引:1
在满足相同的高频滤波效果的情况下,LCL滤波器所需的总电感值比L滤波器小,因此更适于在大功率、开关频率较低的电流源控制型并网设备上应用。然而针对该类型滤波器的参数设计不仅关系到开关频率处纹波抑制效果,同时也会影响电流控制器的性能。随着高频谐波抑制效果明显的LCL滤波器在并联型有源滤波器中应用,基于谐波电流跟踪控制器的LCL参数设计需要进一步研究,因此文中基于并联型有源电力滤波器给出一套LCL滤波器设计方法,并通过仿真验证该LCL滤波器的有源电力滤波器的有效性。 相似文献
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针对时间频率性能检测技术规范,本文介绍了目前常用的GNSS定时单元及相关设备性能现场检测方式,重点分析了常用检测方式下,测试结果置信度较低的6个问题.对于主要问题提供了测试验证实例,并采用广域精确授时技术作为测试参考源,实现了较为有效的性能检测.在此基础上,提出尽快改进目前的测试方式、制定有关在运用现场检测GNSS定时... 相似文献