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建立了双偏心式提前器几何数学模型和力学数学模型,研究了提前器本身的飞块离心力、传动副摩擦力及喷油泵所带负荷对提前特性的影响,试验结果与数学模型基本一致. 相似文献
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本文介绍了柴油机电液式供油提前器的研制。它包括微机控制系统的总体设计,电液式供油提前器的结构设计、数学模型和传递函数,计算机采样控制系统的硬件设计和软件设计,以及变采样周期下的PID 数字控制器参数的寻优整定。在此基础上实现了微机对供油提前角的实时在线控制。 相似文献
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本文介绍了离心式供油自动提前器(简称提前器)的静态计算方法。在分析了提前器结构参数和喷油泵阻力矩对提前器工作特性的影响之后,提出了提前器结构参数的选择原则。 相似文献
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随着排放法规的日益严格,提前器在柴油机上的广泛应用,对提前器的性能要求也愈加提高。本文介绍了一种应用于提前角测试的单片机系统,通过该系统可以方便地测量提前器在各个转速点下的提前角度,为提前器的生产、检测和维修提供依据。 相似文献
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1 概述 当前不断强化的柴油机供油系统要求与之配套的提前器应具有大能量并能够提供多种形式的提前角特性曲线。SNT型提前器正是为了满足上述要求而向市场提供的一种新型机械离心式提前器,已取得了国家专利。由于它的特殊结构设计,具有下述优点: ——与传统的提前器相比,在外形和安装、联接尺寸不变的情况下(见图1),增大了 相似文献
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介绍了一种新型Ф145提前器,该提前器采用驱动盘壳体内壁来限制飞块最大行程;在提前器从动盘上设计了一个挡油环形结构,并将原来的双骨架密封结构改为单骨架结构加0型圈密封结构。与Ф135提前器相比,Ф145提前器结构简单合理、密封性、可靠性及工作能力均有明显提高,提前特性能满足柴油机性能和排放要求。 相似文献
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本文对离心式自动供油提前器的设计原理进行了理论分析,指出油泵的阻力矩对提前器的性能和设计有重大影响;提出了计算提前器的解析法和图解、解析并用的综合法,后者经实际应用,证明是可行的。 相似文献
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提前槽柱塞取代提前器的可行性 总被引:1,自引:0,他引:1
介绍了普通柱塞的工作特点,阐述了提前槽柱塞的工作原理和结构特点,并着重分析了提前槽柱塞取代机械式提前器的条件和可行性,认为:现代柴油机改变了以追求经济性为主要目标的观念,转为以降低排放为首要任务,同时普遍采用了增压技术,因此对动态提前范围的要求大为减小,为提前槽柱塞取代提前器创造了有利条件。 相似文献
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H.P. Garg R.B. Mahajan V.K. Sharma H.S. Acharya 《Energy Conversion and Management》1984,24(3):229-235
In this paper, a simple solar collector cum crop drying system is described. The categorical objectives of this paper are (1) to identify a suitable medium capacity solar drying system and (2) to study analytically and experimentally the performance characteristics of this newly fabricated solar drying system. The drying ratio, rehydration ratio, culinary and organoleptic characteristics, of Methi and Bhendi crops were studied and presented in this paper. 相似文献
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水流动能开发新技术——介绍桁架式柔性叶片横轴转子 总被引:2,自引:0,他引:2
分析了我国水流动能资源和利用现状,推荐了一种新型桁架式水流动能利用转子,指出了这种转子在开发利用江河水流动能、潮汐能、波浪能几种水流动能形式中的技术特色和优势,探讨了它与现有常规水能利用技术形式的区别,并对我国水流动能利用的发展前景提出了看法。 相似文献
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Compiled by Xiangmin Zhou 《热应力杂志》2013,36(6):627-628
The study of the nonlinear response of sandwich flat panels exposed to thermomechanical loading systems is the topic of this article. The sandwich structure considered in this article consists of a thick core layer bonded by the face layers, which are assumed to be symmetrically located with respect to the midplane of the overall structure. The loads involved in this analysis consist of biaxial compressive edge loads, a lateral pressure, and a nonuniform temperature field. The effects of the unavoidable initial geometric imperfections and the character of tangential boundary conditions are incorporated, and their implications upon the structural response are explored. In short, the results of this study are intended to provide pertinent information on the thermomechanical load-carrying capacity of flat sandwich structures. 相似文献
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Jonni Guiller Ferreira Madeira Elizabeth Mendes Oliveira Marcus Val Springer Hosana Lopes Cabral Douglas Ferreira do Carmo Barbeito Ana Paula Gomes Souza Diego Antônio da Silva Moura Angel Ramon Sanchez Delgado 《International Journal of Hydrogen Energy》2021,46(13):8961-8971
Inadequate management of swine manure can lead to contamination of watercourses, groundwater, soil, and air, representing a risk to the sustainability and expansion of pig farming as an economic activity. The aim of this study was to evaluate the potential of this waste for the production of hydrogen from swine manure biogas through steam reforming and water gas shift processes. In this study, calculations of ecological, exergetic and economic efficiencies were carried out. The ecological efficiency, pollution indicator and energy efficiency of the process were, respectively, 93.73%, 19.15 and 79.06%, showing the viability from an ecological standpoint. This is an 8-year plant payback with a hydrogen production cost of $0.14/kWh, in a production scenario of 8760 h/year, showing an exergetic efficiency of 76%. The results from these analyses demonstrates that this type of hydrogen production is an attractive economic route. The results from these analyses have shown that this hydrogen production technology has great economic potential and presents high exegetic yield. 相似文献