共查询到20条相似文献,搜索用时 156 毫秒
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平面二次包络环面蜗杆传动的CAD (M)系统 总被引:1,自引:0,他引:1
本文给出了一个平面二次包络环面蜗杆传动设计与制造的有效,实用的CAD(M)系统。它包括平面二次包络环面蜗杆传动的啮合特性分析,优化和基本参数计算模块,以及平面二次包络环面蜗杆传动强度设计,优化模块和加工平面二次包络环面蜗杆传动的绘图模块。该系统在IBM-PC机上实现,使用时只需输入几个基本参数即可运行。 相似文献
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准平面二次包络环面蜗杆传动参数选择及优化 总被引:1,自引:0,他引:1
准平面二次包络环面蜗杆传动的蜗杆由大直径的双面对称锥形砂轮包络形成,该传动的啮合特性与平面二次包络环面蜗杆传动相当.建立了准平面二次包络环面蜗杆传动的接触线方程、边齿齿厚计算及根切判别函数等数学模型.分析了主要影响该传动啮合性能和几何特性的参数;结合准平面二次包络接触线特点,将复合形法改进成适用于本研究的优化方法,建立了准平面二次包络环面蜗杆优化方案的目标函数和约束函数,并通过实例验证了该优化方法能有效解决一般传动比和"多头小速比"的参数选择. 相似文献
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介绍了平面二次包络环面蜗杆的产生和特点,对平面二包传动的理论、润滑机理、生产实践和计算机辅助设计等方面进行了详细的论述,最后指出平面二次包络环面蜗杆传动的研究发展方向. 相似文献
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平面二次包络环面蜗杆传动的强度分析 总被引:1,自引:0,他引:1
平面二次包络环面蜗杆传动的强度分析大庆石油学院李崇志,姚立纲,代学坤,刘宝杰,张国臣一、引言平面二次包络环面蜗杆传动由于其效率高、承载能力大.寿命长等优点、已获得广泛应用.这种传动在啮合理论研究方面已日臻完善和成熟。但由于该传动的齿形及啮合状态较复杂... 相似文献
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Wang YunliXiao TianyuanDuan GuanghongWang XiankuiNational CIMS EngineeringResearch Center Tsinghua University Beijing China 《机械工程学报(英文版)》2003,16(4):348-351
A design methodology fOr multi-agent systems is proposed. The systemic framework ofCAPP and scheduling integrated multi-agent system according to design methodology is researched.Agent model, composition model and cooperation model are discussed respectively in the multi-agentsystem.Static composition model and dynamic running model of CAPP and scheduling integrated 相似文献
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简要介绍了决策支持系统(DSS)的产生和发展,论述了决策支持系统的系统结构和3个技术层次,辨析了DSS与管理信息系统(MIS)的区别和联系,重点研究了基于DSS的模型库和方法库的设计与实现。阐述了模型库系统的3个组成部分和方法库系统的体系结构,并对模型库与方法库之间的关系调用问题进行了详细分析。提出了模型库系统调用方法库中方法的实现方案。本文介绍的内容,对DSS应用具有一定的参考价值。 相似文献
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Electro-hydraulic control systems are nonlinear in nature and their mathematic models have unknown parameters. Existing research of modeling and identification of the electro-hydraulic control system is mainly based on theoretical state space model, and the parameters identification is hard due to its demand on internal states measurement. Moreover, there are also some hard-to-model nonlinearities in theoretical model, which needs to be overcome. Modeling and identification of the electro-hydraulic control system of an excavator arm based on block-oriented nonlinear(BONL) models is investigated. The nonlinear state space model of the system is built first, and field tests are carried out to reveal the nonlinear characteristics of the system. Based on the physic insight into the system, three BONL models are adopted to describe the highly nonlinear system. The Hammerstein model is composed of a two-segment polynomial nonlinearity followed by a linear dynamic subsystem. The Hammerstein-Wiener(H-W) model is represented by the Hammerstein model in cascade with another single polynomial nonlinearity. A novel Pseudo-Hammerstein-Wiener(P-H-W) model is developed by replacing the single polynomial of the H-W model by a non-smooth backlash function. The key term separation principle is applied to simplify the BONL models into linear-in-parameters struc~tres. Then, a modified recursive least square algorithm(MRLSA) with iterative estimation of internal variables is developed to identify the all the parameters simultaneously. The identification results demonstrate that the BONL models with two-segment polynomial nonlinearities are able to capture the system behavior, and the P-H-W model has the best prediction accuracy. Comparison experiments show that the velocity prediction error of the P-H-W model is reduced by 14%, 30% and 75% to the H-W model, Hammerstein model, and extended auto-regressive (ARX) model, respectively. This research is helpful in controller design, system monitoring and diagnosis. 相似文献
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In the paper, a model predictive controller based on reduced order model is proposed to control belt conveyor system, which is an electro-mechanics complex system with long visco-elastic body. Firstly, in order to design low-degree controller, the balanced truncation method is used for belt conveyor model reduction. Secondly, MPC algorithm based on reduced order model for belt conveyor system is presented. Because of the error bound between the full-order model and reduced order model, two Kalman state estimators are applied in the control scheme to achieve better system performance. Finally, the simulation experiments are shown that balanced truncation method can significantly reduce the model order with high-accuracy and model predictive control based on reduced-model performs well in controlling the belt conveyor system. 相似文献
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刘青 《传动技术(上海)》2006,20(4):23-30
本文研究了一个新柱型电动力转向(EPS-TT)系统.这种EPS-TT系统的显著特点是采用光隔离转矩传感器测量转向器转矩,它的辅助转矩控制方法是采用一个单向马达和两个离合器.因而它不需要一个复杂的马达驱动系统,该系统在作反向转动时要耗费大量的电能.为估算EPS-TT开发了一个完整的转向系统模型和一个简化了的模型.一个完整的车辆模型用来研究车辆的响应.为控制EPS-TT系统设计了线圈载体控制法和比例积分微分控制算法.分析了加于系列不同正弦输入和结果性能.结果表明用ESP-TT系统所达到的性能和常规的ESP系统通过的频率范围相似.整个转向系统模型结果和简化了的模型结果相似但车辆的响应稍稍不同.该线圈载体控制提供了好的性能不影响车辆的稳定性和可控性. 相似文献
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Dynamic analysis of three-dimensional helical geared rotor system with geometric eccentricity 总被引:2,自引:0,他引:2
Yimin Zhang Qibin Wang Hui Ma Jing Huang Chunyu Zhao 《Journal of Mechanical Science and Technology》2013,27(11):3231-3242
A dynamic model of a multi-shaft helical geared rotor system is presented. Rotating shafts of the system are modeled as Timoshenko beams. A general three-dimensional dynamic model of helical gear pairs with geometric eccentricity is developed for the gear mesh and bearing flexibility is included in the model as well. The transmission error and gear geometric eccentricity are simulated as excitations. Eigenvalue solution and the modal summation technique are used to predict the natural frequencies and forced responses of the system. Then two geared rotor system models are presented for validation of the gear dynamic model. It is demonstrated that the gear mesh model is effective for general geared rotor systems, spur and helical gears, one-stage and multi-stage systems. Finally, forced responses of an example system are analyzed to demonstrate the influences of the helical gear geometric eccentricity and the coupling between gear geometric eccentricity and rotor mass unbalance. 相似文献
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基于ACC的制动系统模型研究 总被引:4,自引:1,他引:4
介绍了汽车自适应巡航控制系统的原理和特点,以及该系统对制动系统模型的要求;建立了汽车纵向动力学模型,并在此基础上建立了包括真空助力器、液压系统、制动器的整个制动系统的数学模型.该模型能满足控制的需要,并且较简单又具有较高的精度.对该模型进行了计算机模拟仿真,获得了较好仿真效果. 相似文献
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复杂工程系统多学科设计优化集成环境研究 总被引:17,自引:2,他引:17
复杂工程系统的设计是一个多学科互相适应的系统过程,是一个多学科交叉综合设计优化的多目标决策过程。针对复杂工程系统设计过程,提出了复杂工程系统多学科设计优化集成环境模型,作为提高设计自动化的平台,给出了集成环境的体系结构和技术结构方案,定义了集成环境优化设计的流程;详细说明了工程系统多学科设计优化方法、智能产品模型两项关键技术。最后对集成环境的实施和验证做了相应的阐述。 相似文献
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固体氧化物燃料电池-燃气轮机混合发电系统建模与控制的研究现状与进展 总被引:1,自引:1,他引:0
固体氧化物燃料电池一燃气轮机(Solid oxide fuel cell-gas turbine,SOFC-GT)的混合发电系统是未来高效、清洁的发电技术之一,混合系统的建模、优化与控制方面的研究对于系统集成和商业化运行具有重要意义.通过论述国内外在SOFC单电池机理、半经验模型、电池组模型、混合系统模型,以及系统动态模型与分布式发电系统控制等各个层次的研究成果,提出多尺度的自主研发技术路线.发展适合于高燃料利用率和不同燃料组分的单电池机理模型,并简化出更为合理的半经验模型或近似精确解,用于系统级分析;开发具有自主知识产权的部件模型库,进行系统集成设计和匹配优化;遵循V型开发模式,在系统动态特性分析基础上,开发先进的控制算法形成快速控制原型;建立实时控制的硬件在环演示系统,进行SOFC-GT系统的预集成. 相似文献