共查询到20条相似文献，搜索用时 187 毫秒
1.
电磁震动给料机的安装使用与维修 总被引：1，自引：0，他引：1
电磁振动给料机在选煤厂主要用于把块状或粉状物料从贮料仓或漏斗中定量、均匀、连续地给到受料装置内的一种给料设备.本文主要阐述了电磁振动给料机的安装和调整试运转、使用维修等技术问题. 相似文献
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本文介绍了一种应用于皮带秤上的定量电磁振动给料机,应用大林算法解决了给料机中存在的纯滞后环节给系统带来的稳定性问题。能够在给料机固有特性前提下达到预期的性能指标。大林算法通过构造数字控制器能够改善系统的调节时间和超调量和稳定性,使系统能够达到自己预期的效果。所以应用大林算法的定量给料机能够快速的达到设定的流量值并能够保持在设定值范围内基本无波动从而提高定量给料机的效率和精度。 相似文献
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本文根据ZSW型振动给料机的结构特点及工作原理,结合实际使用中发现的问题,提出了该类型给矿机在选配、安装、使用过程中应注意的问题及解决办法。 相似文献
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弯头段颗粒的运动规律对研究整个管道内颗粒的输送和净化有着关键性的作用,运用气固两相流动理论中的欧拉-拉格朗日离散相模型和湍流模型,采用计算流体力学的FLUENT软件,对通风管道圆形弯头段粉尘运移规律进行数值模拟.分析和讨论不同送风速度以及不同粒径下尘粒在弯头内的运动规律,其结果对工程实践能起到一定的指导作用. 相似文献
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研究核聚变堆(ITER)第一壁的动态响应问题.建立金属矩形薄板的非线性磁弹性振动方程;利用Galerkin方法得到薄板在耦合场中的动力系统,应用Runge-Kutta方法进行数值求解,绘出薄板运动的时程图、相轨迹图和Poincare映射图;分析薄板动力系统的运动规律,研究载荷和磁场强度对运动状态的影响. 相似文献
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为了研究岸桥拉杆系统在工作过程中的振动情况,避免共振,采用ADAMS/Vibration振动模块对岸桥的拉杆系统的运动过程进行分析,通过施加模拟实际情况的载荷并求解,得到此部件模态坐标图和二维、三维频响图.研究结果表明,此方法可以有效的获得和真实工矿相符合的结果,为今后的相关研究提供理论参考,避免事故的发生. 相似文献
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利用形貌、圆度和粗糙度3方面来表述土壤的颗粒形状,研究了颗粒表面粗糙度、棱角以及偏心率对土壤摩擦角的影响。通过倾斜面试验和分离试验,探究了不同形状颗粒在受到水平和垂直振动环境下的分离情况,确定了促进颗粒分离的条件并分析了形状原因导致颗粒分离的微观过程。 相似文献
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An optical transparent 3-D Integrated Microchannel-Electrode System (3-DIMES) has been developed to understand the particles'' movement with electrokinetics in the microchannel. In this system, 40 multilayered electrodes are embedded at the 2 opposite sides along the 5 square cross-sections of the microchannel by using Micro Electro-Mechanical Systems technology in order to achieve the optical transparency at the other 2 opposite sides. The concept of the 3-DIMES is that the particles are driven by electrokinetic forces which are dielectrophoretic force, thermal buoyancy, electrothermal force, and electroosmotic force in a three-dimensional scope by selecting the excitation multilayered electrodes. As a first step to understand the particles'' movement driven by electrokinetic forces in high conductive fluid (phosphate buffer saline (PBS)) with the 3-DIMES, the velocities of particles'' movement with one pair of the electrodes are measured three dimensionally by Particle Image Velocimetry technique in PBS; meanwhile, low conductive fluid (deionized water) is used as a reference. Then, the particles'' movement driven by the electrokinetic forces is discussed theoretically to estimate dominant forces exerting on the particles. Finally, from the theoretical estimation, the particles'' movement mainly results from the dominant forces which are thermal buoyancy and electrothermal force, while the velocity vortex formed at the 2 edges of the electrodes is because of the electroosmotic force. The conclusions suggest that the 3-DIMES with PBS as high conductive fluid helps to understand the three-dimensional advantageous flow structures for cell manipulation in biomedical applications. 相似文献
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丁勇 《科技成果管理与研究》2011,(6):80-82,88
文章简述了机电一体化配料秤相对于传统配料秤的特点以及它通过PROFIBUS DP网络与过程控制系统（DCS）之间的网络连接情况,同时也简述了在DCS控制系统里组态与控制的过程以及机电一体化配料秤在烧结厂的使用情况和由此而带来的经济效益。 相似文献
13.
Field-free particle focusing in microfluidic plugs 总被引：1，自引：0，他引：1
Particle concentration is a key unit operation in biochemical assays. Although there are many techniques for particle concentration in continuous-phase microfluidics, relatively few are available in multiphase (plug-based) microfluidics. Existing approaches generally require external electric or magnetic fields together with charged or magnetized particles. This paper reports a passive technique for particle concentration in water-in-oil plugs which relies on the interaction between particle sedimentation and the recirculating vortices inherent to plug flow in a cylindrical capillary. This interaction can be quantified using the Shields parameter (θ), a dimensionless ratio of a particle’s drag force to its gravitational force, which scales with plug velocity. Three regimes of particle behavior are identified. When θ is less than the movement threshold (region I), particles sediment to the bottom of the plug where the internal vortices subsequently concentrate the particles at the rear of the plug. We demonstrate highly efficient concentration (∼100%) of 38 μm glass beads in 500 μm diameter plugs traveling at velocities up to 5 mm/s. As θ is increased beyond the movement threshold (region II), particles are suspended in well-defined circulation zones which begin at the rear of the plug. The length of the zone scales linearly with plug velocity, and at sufficiently large θ, it spans the length of the plug (region III). A second effect, attributed to the co-rotating vortices at the rear cap, causes particle aggregation in the cap, regardless of flow velocity. Region I is useful for concentrating/collecting particles, while the latter two are useful for mixing the beads with the solution. Therefore, the two key steps of a bead-based assay, concentration and resuspension, can be achieved simply by changing the plug velocity. By exploiting an interaction of sedimentation and recirculation unique to multiphase flow, this simple technique achieves particle concentration without on-chip components, and could therefore be applied to a range of heterogeneous screening assays in discrete nl plugs. 相似文献
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Certain inequalities are presented, related to the L2 norms of the solutions to the vibrating string and heat conduction partial differential equations; in particular, an “L2 maximum principle” is derived for the heat equation, and similar inequalities for the vibrating string problem. 相似文献
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研究振弦式传感器频率测量问题。针对振弦式传感器输出信号微弱、容易受到干扰而造成的测量精度下降问题,提出了一种基于锁相环的新型测频电路,论证了锁相环在电路中在抑制噪声以及提高测频精度的有效作用。锁相环技术用于振弦式传感器测频系统中具有良好的稳态精度和较高的动态性能。 相似文献
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J.P. Den Hartog 《Journal of The Franklin Institute》1933,216(4):459-473
Two new approximate graphical solutions are given for the problem of forced vibration of an undamped single degree of freedom vibrating system with a non-linear spring, whose characteristic is given in the form of a curve. One of these solutions gives much more accurate results than the approximation known so far. 相似文献
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《Journal of The Franklin Institute》2021,358(15):7447-7467
Protection and reliability enactment of electrical systems are important and emerging in power system research. Nowadays, it is very evident that the implementation of an intelligent algorithm is found in the field of substation equipment protection and relaying purposes. Majority of the researches are based on single load connected to a single feeder line and validated using simulation. A hardware based implementation and validation system will be an additional aspects. In this paper, we have discussed an expert system based intelligent relaying scheme by incorporating fuzzy algorithm in microcontroller. Purpose is to control the moving contacts of the breaker part for controlling multiple loads connected to a single feeder line. This paper reports the entire performance of intelligent relaying mechanism only considering stage - I with respect to non-fuzzy based relaying scheme and successfully achieved fastest coordination time after validating it under IEEE 13 Bus system. We have also validated the cascaded fuzzy based system and a non-fuzzy based system using ATMEL microcontroller. 相似文献
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风沙运动机理研究是认识风沙灾害本质进而实现有效防治的基础，所涉及的诸如多尺度、多场耦合、随机性、非线性、尺度效应和复杂系统等科学问题也是科学前沿所关注的共性和热点课题。近年来兰州大学风沙环境力学研究组从力学和地学的学科交叉角度，通过风洞实验、理论建模和计算机模拟研究，揭示了风沙流中沙粒带电量和风沙电场的基本规律及其对风沙流和无线电通讯的影响，实现了对考虑多物理场耦合作用的风沙流发展过程的理论预测以及对风成沙波纹主要特征的计算机模拟，取得一些具有原创性的实质进展。 相似文献
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介绍了基于电力线通信的馈线自动化终端设备,利用AD7865为主要芯片,设计完成硬件电路及软件算法。本装置集测量、通信、控制等功能于一体,能实时提供电网电压、电流、功率等数据。 相似文献
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Dean Karnopp 《Journal of The Franklin Institute》1978,306(2):165-181
Dynamic systems containing particles and rigid bodies capable of movement in two- or three-dimensions may be represented by equations of motion in several basic forms. In all cases geometric nonlinearities are involved and terms arise in the equations which are difficult to understand and interpret. The equations often conceal the basic structure of the dynamic model of the system since only combinations of parameters and combined effects of various constraints finally appear.In this paper the basic relations for the dynamic elements as well as the transformations among internal forces and velocities are depicted using bond graphs. The energetic structure of the system is thus exhibited in multiport form. This aids in the exploration of alternative equation formulation and in understanding of the assumptions involved in any particular equation set. Further, a bond graph model is easily coupled with nonmechanical dynamic models through force or motion generators. 相似文献