Architecture of a platform for hardware-in-the-loop simulation of flying vehicle control systems

A hardware-software platform is presented, which is designed for the development and hardware-in-the-loop simulation of flying vehicle control systems. This platform ensures the construction of the mathematical model of the plant, development of algorithms and software for onboard radioelectronic equipment and ground control station, and visualization of the three-dimensional model of the vehicle and external environment of the cockpit in the simulator training mode.     

A portable hand-driven solid-fuel device for generating fire whirls

A simple portable solid-fuel device for generating fire whirls is described. This device is suitable for studying the dynamics of fire whirls under laboratory and field conditions.     

汽车排放控制系统中的氧传感器现状及展望

介绍了浓差型(Nernst型)、极限电流型和半导体电阻型等汽车排放控制系统中的氧传感器原理及结构。在综合该领域国内外研究现状的基础上,对氧传感器的发展进行了展望。     

A portable air jet actuator device for mechanical system identification

System identification of limb mechanics can help diagnose ailments and can aid in the optimization of robotic limb control parameters and designs. An interesting fluid phenomenon--the Coanda? effect--is utilized in a portable actuator to provide a stochastic binary force disturbance to a limb system. The design of the actuator is approached with the goal of creating a portable device which could be deployed on human or robotic limbs for in situ mechanical system identification. The viability of the device is demonstrated by identifying the parameters of an underdamped elastic beam system with fixed inertia and stiffness and variable damping. The nonparametric compliance impulse response yielded from the system identification is modeled as a second-order system and the resultant parameters are found to be in excellent agreement with those found using more traditional system identification techniques. The current design could be further miniaturized and developed as a portable, wireless, unrestrained mechanical system identification instrument for less intrusive and more widespread use.     

一种新型的便携式电梯限速器检测装置

提出了一种新型的便携式电梯限速器检测装置,该装置由电源变换模块和电动机总成模块组成.电源变换模块为检测装置提供工作电压,电动机总成模块内含驱动电动机和单片机测控系统.单片机控制交流伺服电动机驱动被测电梯限速器的轮盘,通过霍尔接近开关采集限速器轮盘的转速,结合轮盘的节圆直径即可计算出轿厢移动的速度.限速器的电气动作速度和机械动作速度分别通过电气开关和机械限位器来获得.给出了检测装置的结构组成,分析了检测装置的测控原理,设计了具体的检测流程,最终研制出了检测装置的样机.试用结果表明:该装置的检测精度满足国家标准规定的各项要求,具有体积小、重量轻、便于携带、安装方便、操作简单和可靠性高的优点,应用前景广阔.     

Smart product design for automotive systems

Frontiers of Mechanical Engineering - Automobiles evolved from primarily mechanical to electro-mechanical, or mechatronic, vehicles. For example, carburetors have been replaced by fuel injection...     

Internal model control for industrial wireless plant using WirelessHART hardware-in-the-loop simulator

The emergence of wireless technologies such as WirelessHART and ISA100 Wireless for deployment at industrial process plants has urged the need for research and development in wireless control. This is in view of the fact that the recent application is mainly in monitoring domain due to lack of confidence in control aspect. WirelessHART has an edge over its counterpart as it is based on the successful Wired HART protocol with over 30 million devices as of 2009. Recent works on control have primarily focused on maintaining the traditional PID control structure which is proven not adequate for the wireless environment. In contrast, Internal Model Control (IMC), a promising technique for delay compensation, disturbance rejection and setpoint tracking has not been investigated in the context of WirelessHART. Therefore, this paper discusses the control design using IMC approach with a focus on wireless processes. The simulation and experimental results using real-time WirelessHART hardware-in-the-loop simulator (WH-HILS) indicate that the proposed approach is more robust to delay variation of the network than the PID.     

Functional testing of measurement-based control systems: An application to automotive

The number of measurement-based embedded systems increases continuously in automotive, avionic, defense, and communication industries. In order to ensure the system’s compliance with requirements, adequate solutions for functional testing are needed. The paper describes an original approach for the functional validation of measurement-based complex control systems. The main focus is on the automatic generation of realistic continuous data sets (test stimuli) within the operational ranges of the measurement system under test, by applying enhanced statistical techniques, which are able to reproduce both timing and data dependencies. A thorough case study using an air fuel ratio control system from the automotive domain is performed to assess the approach. Results indicate that the proposed method is suitable for automated functional testing of embedded control systems within a Software-in-the-Loop test environment.     

Developmens of alternative systems for automotive air conditioning - A review

Journal of Mechanical Science and Technology - Vapor-compression refrigeration (VCR) systems are still the most widely used type of automotive air conditioning (A/C) systems in spite of their high...     

A flow control device for incompressible fluids

This paper introduces a constant flow method for incompressible fluids using a mechanical choked orifice plate (MCOP), even when changes in differential pressure occur between the upstream and downstream. The MCOP is constructed by inserting a float-spring blockage into an ordinary orifice plate to imitate the function of a critical cavitating flow in a cavitating Venturi. A model MCOP is established and verified by numerical simulation, and a prototype MCOP is designed and tested by experiments. The results show that the numerical simulation is a good guide for the MCOP design. The designed MCOP can keep a constant flow with an error in the flow control of ±4% within the range of the differential pressure between the upstream and downstream of 6–70 kPa. Because the constant flow is obtained without fluid vapourization, the pressure loss is greatly reduced and the noise and erosion are avoided. Additionally, due to the action of the float-spring blockage being based on the differential pressure between upstream and downstream, it is simultaneously insensitive to both upstream and downstream pressure fluctuations. The design idea and the conclusions can be used as a reference in the design of a constant flow control device for incompressible fluids.     

基于CAN总线的汽车起重机智能控制系统

阐述了大型汽车起重机的发展趋势,指出了开发基于CAN总线的大型起重机智能控制系统具有重大意义.介绍了系统主要控制对象,提出了一套完备的自适应的智能控制系统.针对CAN总线技术应用中普遍存在的问题:由于1条总线太长引起的系统不稳定和总线容易冲突,提出了一种改良的CAN网络拓扑结构,其采用总线分段,双CAN总线协议结构.通过该汽车起重机在现场试运行时表现的卓越品质,验证了此智能控制系统的优越性.     

Target diagnostic control system implementation for the National Ignition Facility (invited)

The extreme physics of targets shocked by NIF's 192-beam laser is observed by a diverse suite of diagnostics. Many diagnostics are being developed by collaborators at other sites, but ad hoc controls could lead to unreliable and costly operations. A diagnostic control system (DCS) framework for both hardware and software facilitates development and eases integration. Each complex diagnostic typically uses an ensemble of electronic instruments attached to sensors, digitizers, cameras, and other devices. In the DCS architecture each instrument is interfaced to a low-cost WINDOWS XP processor and JAVA application. Each instrument is aggregated with others as needed in the supervisory system to form an integrated diagnostic. The JAVA framework provides data management, control services, and operator graphical user interface generation. DCS instruments are reusable by replication with reconfiguration for specific diagnostics in extensible markup language. Advantages include minimal application code, easy testing, and high reliability. Collaborators save costs by assembling diagnostics with existing DCS instruments. This talk discusses target diagnostic instrumentation used on NIF and presents the DCS architecture and framework.     

Reconfigurable modular automation systems for automotive power-train manufacture

This paper describes research towards the realization of reconfigurable modular automated machines and the associated engineering methods and tools necessary to support their lifecycle needs. UK-based research, in collaboration with the Ford Motor Company and several machine builders, has resulted in the development of full-scale prototype reconfigurable modular automation systems for both engine assembly and machining applications. The implementation of an assembly system is featured in this paper. An engineering environment and associated reconfigurable component-based control system architecture have been created aimed at supporting the lifecycle needs of a new generation of agile automated systems, i.e., providing reconfigurable, easily scalable automated machinery. This approach has the potential to fit within a wider collaborative automation strategy where manufacturing systems are implemented as a conglomerate of distributed, autonomous, and reusable units.     

基于前轮转向角度自适应控制功能的摆线式汽车转向器研究

通过对传统汽车转向器的分析，研制了新型的摆线式汽车转向器。该转向器具有自适应角度控制功能，避免了前轮胎的内侧磨损，很好解决了汽车转向器研究方面遗留的技术问题。     

开放式集散控制—GDUTAA系统的研究

开放式集散控制－－GDUTAA系统的研究,是以μXL中小型集散控制为基础,通过μXL的操作站与上位PC机相连接,使得我们既能充分利用μXL原有的各种,又能利用上位PC机进一步开发各种新的控制算法,如：神经网络、智能控制、专家系统等,并在μXL上加以实施,为我们研究新的控制理论和控制算法提供了一个开放式的实验平台,同时为拥有μXL系统的各工矿企业提供了一个技术更新的方向。     

Total quality control for automotive raw foundry brake disks

In this paper, a solution for the automatic raw foundry brake disk dimensional characterisation and visual inspection for the automotive industry is presented. Three different computer vision techniques are used: a calibrated 3D structured-light vision technique, for dimensional characterisation and inspection; a 3D uncalibrated structured-light vision technique for local fault detection; and a common 2D-vision technique for a further local fault recognition. A new and fully automated 3D-calibration procedure for piece dimensional characterisation is also described. The whole system is an accurately synchronised blending of mechanics, automation, computer vision and robotics. Results from industrial implementation are presented.     

便携式舰船热工仪表校准装置设计

根据舰船热工参数仪表计量需求。研究设计了便携式计量校准装置。装置利用ARM嵌入式计算机系统作为中心控制器,完成了压力、温度信号的输出与测试,提高了校准装置的整体性能及便携性,为舰船仪表校准与测试工作的开展提供了技术支持。     

汽车仪表远视点成像显示系统

论述了目前汽车仪表显示方式的发展趋势,介绍了汽车仪表远视点成像显示的三种类型,重点探讨了HUD显示,并对其中几个问题提出改进方案。     

基于PIC单片机的小型空气压缩机控制装置

使用PIC单片机构成小型空气压缩机的控制装置,文中给出了该控制装置的硬件电路和程序框图,并详细地叙述了工作原理。