Assembly Control System Research Articles

Predicting performance indicators with ANNs for AI-based online scheduling in dynamically interconnected assembly systems

Mass customization demands shorter manufacturing system response times due to frequent product changes. This increase in system dynamics imposes additional flexibility requirements especially on assembly processes, as complexity accumulates in this last step of value creation. Flexible and dynamically interconnected assembly systems can meet the increased requirements as opposed to traditional dedicated assembly line approaches. The high complexity and dynamical environment in these kinds of systems lead to the demand for real-time online control and scheduling solutions. Within the decision-making of online scheduling, the capability of predicting the consequences of available actions is crucial. In real-time environments, running extensive discrete-event simulations to evaluate how actions unfold requires too much computing time. Artificial neural networks (ANN) are a viable alternative to quickly evaluate the potential future performance value of a production state for online production planning and control. They can predict performance indicators such as the expected makespan given the current production status. Leveraging recent advances in artificial intelligence (AI) game algorithms, an assembly control system based on Google DeepMind’s AlphaZero was created. Specifically, an ANN is incorporated into the approach that suggests favorable job routing decisions and predicts the value of actions. The results show that the trained network can predict favorable actions with an accuracy of over 95% and estimate the makespan with an error smaller than 3%.

Design of FPC board assembly control system based on robot integration technology

Design of FPC board assembly control system based on robot integration technology

Design of FPC board assembly control system based on robot integration technology

Design of FPC board assembly control system based on robot integration technology

新型铺路机上双折臂吊水泥预制板自动拼装控制系统研究

新型铺路机上双折臂吊水泥预制板自动拼装控制系统研究

Возможности применения отечественного преобразователя сигналов датчиков перемещения 1310НМ025 в системе управления двигателя-маховика

Возможности применения отечественного преобразователя сигналов датчиков перемещения 1310НМ025 в системе управления двигателя-маховика

Design of Communication Among Vision System, PLC and Industrial Robot based on Modbus-TCP protocol

In order to solve the problems of small system, single machine and single function operation of industrial robots and improve the automation of the system, Modbus-TCP protocol is used as communication platform to realize data exchange among industrial robot, vision system and main control PLC, and an automatic assembly control system composed of Siemens S7-1200 PLC, industrial robot, vision system, conveying line and assembly line is constructed. The application of the system in automatic identification and assembly line will improve production efficiency and reduce labor costs.

Teorijsko i eksperimentalno proučavanje hidraulički aktivirane injektorske pumpe sa elektronski kontrolisanim prstenastim ventilom

The relevance of this study is subject to the fact that the intricate design of the valve assembly's control system shows the insufficiently high-performance characteristics of the pump-injector units. The purpose of the study is to develop a modernization model for a pump-injector unit to increase its functional performance and develop its control valve. The principal method to be used to investigate the problem is to assess the influence of the design parameters of the control valve on the quality of the operation of the pump-injector unit. The authors developed a method to upgrade a diesel pump-injector unit using a ring control valve, as well as a mathematical model for the operation of the ring control valve of the pump-injector unit, which allows for the establishment of parameters affecting the quality of its operation. Studies have shown the effectiveness of the control ring valve on the pump-injector unit. The ring valve performs the function of both the force and locking elements. The absence in it of a particular power element (spring) can significantly reduce the volume of the intra-valve cavity. The ring functions as a free-edge mechanical multiplier built into it with a multiplication factor π. There is no spring, discharge volume decreases, and the pump-injector unit speed increases.

A Robotic Peg-in-Hole Assembly Strategy Based on Variable Compliance Center

Many kinds of peg-in-hole assembly strategies for an industrial robot have been reported in recent years. Most of these strategies are realized by utilizing visual and force sensors to assist robots. However, complex control algorithms that are based on visual and force sensors will reduce the assembly efficiency of a robot. This issue is thoughtless in traditional assembly strategies but is critical to further improve the efficiency of assembly automation. In this work, a new assembly strategy that is based on a displacement sensor and a variable compliant center is proposed to improve robot performance in assembly tasks. First, an elastic displacement device for this assembly strategy is designed, and its performance is analyzed. The displacement signal generated by the displacement sensor is used to detect the contact state of the peg and hole and to guide the robot to adjust the posture. Second, an assembly strategy, including the advantages of passive compliance and active compliance, and a simple assembly control system are designed to improve the assembly efficiency. Last, the effectiveness of the proposed assembly method is experimentally verified using a robot with 6 degrees of freedom and a chamferless peg and hole with a small clearance (0.1 mm). The experimental results show that the assembly strategy can successfully complete the precision peg-in-hole assembly and assist the robot in accurate assembly in industrial applications.

Risk-based design of dolly assembly control system of drilling top drive

To achieve drilling safety, a risk-based design of the dolly assembly control system is proposed. The risk and cost-benefit assessments are conducted to obtain information needed to make decisions about the safe design of the system. A failure modes and effects analysis (FMEA) is performed to identify and analyze the plausible hazardous scenarios by determining the failure modes of the subcomponents and their effects on the system operation. The priorities of risks are ranked by assigning a risk priority number for further investigation. Appropriate recommendations are made as risk reduction measures to achieve a more intrinsically safe design. A subsequent fault-tree analysis (FTA) is performed to provide a more quantitative risk evaluation. Monte Carlo simulations (MCSs) are conducted to determine the change of the availability between the original design and a system with recommendations adopted. For the sake of decision making, a cost-benefit assessment is performed, which demonstrated that the suggestions provided in this study are highly justifiable and strongly recommendable.

Design and Implementation of Hybrid Electric Vehicle Control System CAN Communication

Based on the vehicle CAN bus technology, with features of Hybrid Electric Vehicle (HEV) control network be concerned, CAN bus protocols of application layer suitable for HEV are developed in the paper. And control network is built based on multi-master CAN distributed control technology. Through CAN controller programming of DSP, supported by the corresponding external drive circuit, the motor controller nodes is connected with the vehicle CAN network. Finally the CAN Bus communication of HEV energy assembly control system is designed and realized. Experimental result indicates that the system works well with stable signal and strong anti-jamming ability, and the communication with HEV CAN bus is realized successfully.

Assembly Sequence Generation - Heuristic Research

Automatic assembly generation methods generally work in two steps: frrst, generation of all admissible assembly sequences and then selection of the optimal solution. In this process, the main obstacle is the combinatory explosion of solutions and therefore a prohibitive determination time. An original method of direct generation of the optimal assembly sequence from the list of product admissible operations is presented. It is based on the Heuristic Research and elaborates in real time the optimal solution according to some single or multiple criteria and in function of the product components really available. Three optimal criteria are taken into account: parallelism, structure and time. The selected solution is then used in a flexible cell assembly control system, which assigns in real-time assembly operations to assembly stations in function of the actual assembly shop state. System is reactive to disruptions such as failure, component shortage… The method is dead-lock free.

Petri Net Based Design and Diagnosis for an Assembly Cell

This paper discusses the use of a petri-net model within a simple diagnosis system for a laboratory assembly station. A two-level detector and response scheme is introduced and it is demonstrated that the scheme can be implemented within an assembly control system driven by a low specification PLC. The paper also illustrates the benefits of considering diagnostic issues during system design, and concludes that such a simple scheme can be advantageous from the perspective of developing efficient diagnostic approaches for more complex manufacturing situations.

A Multi-Microprocessor-Based Control System for Assembly of Electronic Components

Abstract Design experiences of a project on building a multi-microprocessor-based automation control system for the assembly of electronic components is reported in this paper. The control system consists of four subsystems, which are the supervisory controller, the visual pattern recognition system, the display unit and the servo system. The emphasis was put on the design of a fast, cost-effective visual information-processing unit. For this, a new type of frame grabber together with noise-insensitive image processing algorithms are incorporated by employing the TMS 4161 dual ported memory. To verify the proposed design concepts, an experimental control system is developed and applied for the semiconductor die-bonding machine.