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大型桥梁建设工程巨大,影响因子较多,工程造价预测难以有效均衡,传统方法采用单因素灰色关联预测的工程造价预测设计,预测精度和均衡性不好。提出一种基于主成分分析的大型桥梁造价预测交叉均衡算法,对大型桥梁工程造价预测和控制进行数学模型构建,得到质量—效率—成本控制的多目标贴近度数学模型。分析大型桥梁消耗影响特征信息统计参量,得到主成分分析的成本特征方程,实现大型桥梁造价预测交叉均衡算法。实验结果表明,采用该算法,可以实现质量水平和效率水平较高,单位成本较低的目标,达到对工程造价预测交叉均衡的目的。 相似文献
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施工阶段工程成本控制是工程造价管理的核心,它贯穿于整个施工过程,从施工前期的成本预测到施工准备阶段运用价值工程原理,制定合理的实施方案,从施工期间的成本控制到最终竣工验收的成本控制。 相似文献
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施工阶段工程成本控制是工程造价管理的核心,它贯穿于整个施工过程,从施工前期的成本预测到施工准备阶段运用价值工程原理,制定合理的实施方案,从施工期间的成本控制到最终竣工验收的成本控制。 相似文献
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本文以北京市为例,分别应用无偏灰色GM(1,1)预测模型和非线性预测模型对北京市的用水量进行了预测,由于单个的预测方法缺乏普遍性,所以本文采用无偏灰色GM(1,1)预测模型及非线性预测模型的加权组合模型,对北京市的用水量进行了预测,预测结果显示,与北京实际用水量相比,无偏灰色GM(1,1)预测模型的预测结果的误差平方和较小,而平均绝对误差较大;非线性预测模型的预测结果的误差平方和较大,但平均绝对误差较小。加权组合模型可以平衡以上两种预测模型的优缺点,其预测结果的平均绝对误差和误差平方和均介于两种模型之间,使得结果更加精确可靠,此方法可以用于城市用水量的短期和长期预测中。 相似文献
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建筑施工企业面临着激烈的市场竞争,为了在市场竞争中增加效益,提高企业竞争力,关键在于企业施工质量的提高、降低工期、降低造价。加强施工过程中的成本控制,减支增效是企业长期经营战略必须实施的项目。施工阶段工程成本控制是工程造价管理的核心,它贯穿于整个施工过程,从施工前期的成本预测到施工准备段运用价值工程原理,制定合理的实施方案,从施工期间的成本控制到最终竣工验收的成本控制。 相似文献
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Xinli Yin Bailong Yang Jianxiang Xi Xiaojun Yang 《Journal of The Franklin Institute》2019,356(7):4061-4075
The current paper addresses leader-following guaranteed cost synchronization with the cost budget given previously for the second-order wireless sensor networks. The published researches on guaranteed cost synchronization design criteria usually are based on the linear matrix inequality (LMI) techniques and cannot take the cost budget given previously into consideration. Firstly, the current paper proposes a guaranteed cost synchronization protocol, which can realize the tradeoff design between the battery power consumption and the synchronization regulation performance. Secondly, for the case without the given cost budget, sufficient conditions for leader-following guaranteed cost synchronization are presented and an upper bound of the cost function is shown. Thirdly, for the case that the cost budget is given previously, the criterion for leader-following guaranteed cost synchronization is proposed. Especially, the value ranges of control gains in these criteria are determined, which means that the existence of control gains in synchronization criteria can be guaranteed, but the LMI techniques can only determine the gain matrix and cannot give the value ranges of control gains. Moreover, these criteria are only associated with the minimum nonzero eigenvalue and the maximum eigenvalue, which can ensure the scalability of the wireless sensor networks. Finally, numerical simulations are given to illustrate theoretical results. 相似文献
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中职课程教学改革要求教学要以学生为中心,把培养学生分析问题、解决问题的能力和自主学习的能力摆在核心位置。“建筑工程装饰预算”作为工程造价专业的一门综合性较强的方向技能课,通过“支架式”教学创设学习情境,在教学中注重识图与预算的有机结合,“教”以“学”为中心,探讨教学过程中遇到的问题及解决措施。 相似文献
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电力工程项目成本超概预算原因和控制策略 总被引：2，自引：0，他引：2
随着自然资源的日益紧缺、劳动力成本的上升等各种电力公司面临的日益严峻的形势使得其利润受到更加严重的制约。文章从工程项目的组织及实施方式、从成本责任及目标成本确立方式上、从成本控制上看、从材料管理上看四个方面分析了电力工程成本超概预算的原因。本文认为确保工程项目取得较高的利润,电力企业应当通过节约各项成本、缩减项目人员及机构,落实成本责任制、增强工程的质量管理、健全工程项目索赔机制等四个方面入手控制项目成本。 相似文献
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建设单位对工程造价的控制就是在保证项目工程质量的前提下,在投资决策阶段、设计阶段和建设项目实施阶段中把工程项目总投资控制在批准的限额内,力求在各个建设项目中合理使用人力、物力、财力,取得较好的投资效益和社会效益。 相似文献
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《Journal of The Franklin Institute》2019,356(16):9344-9363
In the present study, a novel technique is suggested for the adaptive non-linear model predictive control based on the fuzzy approach in three stages. In the presented approach, in the first stage, the prediction and control horizons are obtained from a fuzzy system in each control step. Another fuzzy system is employed to determine the weight factors before the optimization stage of developing new controller. The proposed controller gives the parameters of the model predictive control (MPC) in each control step in order to improve the performance of nonlinear systems. The proposed control scheme is compared with the traditional MPC and Generic Model Control for controlling MED-TVC process. The performances of the three proposed controllers have been investigated in the absence and presence of disturbance in order to evaluate the stability and robustness of the proposed controllers. The results reveal that the novel adaptive controller based on fuzzy approach performs better than the two other controllers in set-point tracking and disturbance rejection with lower IAE criteria. In addition, the average computational time for the adaptive MPC exhibits a decline of 34% in comparison with the traditional MPC. 相似文献
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工程造价的有效控制是工程建设管理的重要组成部分。限额设计就是在工程设计阶段,把工程造价的发生控制在批准的造价限额以内,随时纠正发生的偏差以保证管理目标的实现,以求在项目建设过程中合理使用人力、物力、财力,取得最大的投资效益。 相似文献
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《Journal of The Franklin Institute》2022,359(15):7818-7846
In this study, the problem of observer-based control for a class of nonlinear systems using Takagi-Sugeno (T-S) fuzzy models is investigated. The observer-based model predictive event-triggered fuzzy reset controller is constructed by a T-S fuzzy state observer, an event-triggered fuzzy reset controller, and a model predictive mechanism. First, the proposed controller utilizes the T-S fuzzy model and is constructed based on state observations and discrete sampling output, which can greatly reduce the occupation of communication resources. Then, the model predictive strategy for reset law design is designed in this paper. With a reasonable reset of the controller state at certain instants, the performance of the reset control systems is improved. Finally, the validity of the proposed method is illustrated by simulation. The merits of the proposed controller in improving transient performance and reducing the communication occupation are demonstrated by comparing its results with the output feedback fuzzy controller and the first-order fuzzy reset controller. 相似文献
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Koksal Erenturk 《Journal of The Franklin Institute》2010,347(7):1171-1185
This study presents application of a fuzzy controller to a nonlinear two-mass system control. The proposed controller structure is strengthened with a gray estimator. Firstly, a complete state-space mathematical model for a nonlinear two-mass system is developed and numerically simulated. Then, a fuzzy controller is designed to regulate the speed of the system. In order to perform a dynamic and powerful control action, future error values are estimated by gray modeling technique. The gray estimators of the torsional torque and the load machine speed are tested with open-loop and closed-loop control structures to test the robustness of the proposed method for step changes in input parameters. It is observed that the tracking ability of the gray estimators is not influenced for different operation modes. The performances of the control structures, which are supported with gray estimators, are given and no additional feedbacks are required for robust control action. The simulation results are confirmed by experimental results and conclusions are given. 相似文献
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基于灰色模糊优选模型的科技型中小企业人力资本投资风险评价 总被引：2，自引：0，他引：2
从科技型中小企业人力资本投资风险的特点入手,分析了人力资本投资风险的影响因素,提出了投资风险的评价指标体系,引入灰色关联分析,发展了模糊优选评价模型,构建了投资风险灰色模糊优选模型,从而提高了科技型中小企业人力资本投资风险评价的客观性和可操作性. 相似文献
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浅析价值工程在施工成本控制中的运用 总被引：1，自引：0，他引：1
从价值工程的概念与原理出发,简述了用价值工程进行施工项目成本控制的过程,并对项目成本各组成部分进行分析,阐述各部分价值分析的重点在于提高项目各部分成本的使用价值,降低项目成本,增加项目价值,为施工项目的成本控制提供了有力的依据。 相似文献