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近年来,自动化和机械化通过科学技术的进步取得了很大成就.在综合机械化中,需要大量的机电设备.但是,机械和电气设备的问题严重影响了矿井系统的安全性.因此,在设备出现故障时必须进行快速维护,以确保煤矿的生产安全.维修设备时,必须确定故障原因.过去,设备维护领域的故障排除通常是通过手动经验法则来完成的,这不仅导致效率低下,而... 相似文献
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在设备故障诊断过程中,中靠频谱分析往往不能一次就准确判断出故障原因,结合相位分析则可以提高故障诊断的准确性和效率。 相似文献
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介绍TC104AB数据采集及故障诊断专家系统在滚动轴承故障诊断中的应用,根据频谱分析找出故障原因,保证设备正常运行。 相似文献
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为保证机械设备在一定的工作环境中以及在一定的连续的工作期间内可靠有效地实现其功能,近年来,单纯的监测诊断已经难以满足工业设备正常工作的要求,变定期维护为预知维护,故障预测技术是该技术领域今后的主要研究方向。而人工智能方法的发展以及在许多案例中的成功应用,为机械设备故障预测技术开拓了新的途径,其中人工神经网络就是其中重要的新兴技术,随着人工神经元网络(ANN)研究的进展,神经网络越来越多地应用于机械控制领域的各个方面,从过程控制、生产控制、模式识别、故障诊断直到决策支持都有应用神经元网络的例子,而且取得了很好的效果。首先介绍机械设备故障诊断的发展过程和人工神经网络的特点,然后着重介绍人工神经网络在机械设备故障诊断中的应用方法的提出及其应用现状。 相似文献
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70年代以来,旋转机械故障诊断技术得到很大发展,尤其是对大型机组的故障诊断受到了人们的高度重视,围绕着如何使诊断更准确无误,进行了大量的理论研究和实验工作。本文从应用的角度,以油膜涡动(振荡)为例,阐述频域提纯法在故障诊断中的应用。 相似文献
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近年来,随着社会经济水平的逐步提高,信息技术的快速发展,我国石油炼化这一行业也取得了突飞猛进的发展,同时石油炼化企业对其设备管理要求也随之提高,在设备管理和维修中,机械故障诊断为其不可或缺的一个部分。下面文章就机械故障诊断在炼化设备管理中的应用进行研究和分析。 相似文献
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引起设备1倍转速频率的故障类型有很多,如不平衡,不时中,严重松动,共振等,相位分析是区分它们的有效手段.风机振动很多都以低频振动为主,相位分析的应用可大大提高判断的准确性. 相似文献
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火电厂汽轮发电机组轴系支承系统振动是机组起动和运行中必须监测的项目之一,过大的振动将损坏轴系本身或支承轴瓦。通常,轴承座的受迫振动有下面关系式 相似文献
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This paper asks the question: what kind of economic benefits do rural telecommuters experience in Southwestern Ontario? This is a relevant question in Canada where, according to Statistics Canada (2017) one in 14 people work from home. This paper presents an overview of the current literature on telecommuting. We estimate the telecommuter surplus in Southwestern Ontario where the region is currently deploying one of Canada's largest publicly-funded ultra-high-speed broadband initiatives known as SouthWest Integrated Fibre Technology Inc. (SWIFT). The analysis is based on SWIFT residential and farm surveys (n?=?3948) conducted in 2017. We find that an average telecommuter's surplus in terms of costs saved, including opportunity cost ranges from $8820 to $23964 per annum per telecommuter, depending on the number of days telecommuted per week for home and primary residence dwelling type. The social net benefits of telecommuting differ from its private net benefit (the focus of our paper) since the former includes both positive and negative externalities associated with telecommuting such as reduced traffic congestion, reduced probability of road accidents, as well as some workers shirking their duties (a negative impact). We leave this for future work. 相似文献
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This paper estimates consumer surplus in the Korean mobile telephone services (MTS) market. The Korean mobile telecommunications market has grown rapidly since 1997 when competition was introduced and Code Division Multiple Access (CDMA) technology was commercialized. Because consumer surplus is relevant to the controversy over establishing an appropriate price level between consumers and service providers, the need for a robust measurement of benefit from MTS is increasing. The measured net consumer surplus estimated by means of elasticities of demand reached about US$48.8 billion in the period 1996–2004 and the changes amounted to about US$8.8 billion during the same period. In particular, after competition was introduced into the market with an accompanying price decrease and increase in the number of subscribers, consumers have benefited greatly. Therefore, it can be inferred that a facility-based competition policy and the reduction in price of access such as handset subsidies all played a positive role in the early diffusion of MTS in Korea. The estimated consumer surplus in this paper does not include network externality (option externality); if this were considered, the total social welfare of the consumer would be larger. 相似文献
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James Richardson 《战略管理杂志》1993,14(5):339-350
Japanese auto makers are reported to enjoy high supplier performance through long-term relationships, specific investments, and sole sourcing. Quality management consultants in the U.S. have been strongly advocating adoption of these practices. But economic and management theorists would predict that the combination of a high level of relationship-specific investments and sole sourcing will lead to problems with supplier performance. In fact the Japanese auto makers use a hybrid form of organization we term parallel sourcing. We present a transaction costs model that shows how parallel sourcing provides incentives for supplier performance associated with multiple sourcing while preserving claimed benefits of sole sourcing. 相似文献
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从工作实践出发,结合电力系统的干部管理以及综合统计和整理考核测评结果的一些经验,试就干部考核中影响民主测评准确性的几种现象、怎样科学地开展民主测评、如何合理运用民主测评结果作了初步分析和探讨。 相似文献