Recent Patents on Mechanical Engineering (v.9, #2)

Meet Our Editorial Board Member by Qinghua Qin (93-93).

Recent Patents on Construction Additive Manufacturing Method by Yuan Chai, Qing-Hua Qin, Yi Xiao (94-101).
Background: Additive manufacturing (AM) in construction is one of the important approaches in AM technology. Researchers and engineers working with AM technology often need to deal with issues in large item manufacturing, including manufacturing size limitation, instability of long-distance movement, raw surface, high cost on manufacturing support, and reducing manufacturing time.
Objective: To provide an overview on the development of construction AM and then an initial insight to achieve construction AM with novel solutions to practical problems.
Method: We presented a detailed realization of these categorised approaches and make comparisons among these methods to identify optimal solutions for a range of problems.
Results: Recent patents and scholarly articles were addressed and the future of this technology was prospected. Future developments of construction AM were identified.

Wire bonding is still the dominant form of electronic packaging for its mature technology, low cost and high reliability. The development trend of electronic components is: small volume, high power, high frequency and high reliability. With the improvement of signal transmission frequency and device power, bonding wire cannot be regarded as simple transmission line with no loss. In this paper, the latest research status and various patents of wire bonding electromagnetic characteristics are summarized in three aspects: bonding wire, wire layout and packaging structure. The factors affecting the electromagnetic characteristics are summarized and several resolutions are proposed to improve the electrical properties. In the meantime, the prospect and development trends are described in this paper. With the study of bonding wire loop technology and electromagnetic properties, the wire bonding form can continue to meet the requirements of encapsulation process and be dominant solution of low cost encapsulation in a long time.

Background: Data volume and multitude of sources have experienced exponential growth in manufacture process and are facing with the challenge of Industry 4.0.
Objective: The purpose of this study is to provide an overview about the recent patents on big data in process control systems and explain how big data technique settles the problems in different manufacturing processes.
Methods: The research method and patent analysis are employed for use in this study.
Results: Current and future developments of the patents on big data in process control systems are finally provided to improve the current process control systems and big data technique applications.
Conclusions: It is suggested that future work should focus on developing big data algorithms appropriate for manufacturing operations, combination of modern and traditional information techniques, models for manufacturing supply chain collaboration, models for data collection and generation based on more powerful big data devices, and new data skew handling methods.

Recent Advances in Orthodontic Archwire Bending Robot System by Jingang Jiang, Zhao Wang, Yongde Zhang, Xiaoyang Yu, Xiaowei Guo, Yi Liu (125-135).
Malocclusion is the common oral disease. As the common and effective malocclusion orthodontic treatment method, and the important procedure of fixed appliance technology is the bending of orthodontic archwire. Precise position and posture control ability and stiffness bolding ability of robot can be used to overcome the archwire hyperelasticity. Orthodontic archwire bending robot system can improve the bending accuracy and efficiency of personalized archwire and promote the development of orthodontics. There has been an ever increasing concern for developing orthodontic archwire bending robot system with more applicable characteristics, especially those that can easily fit into various orthodontic arch wire space shapes. In this paper, research status of the typical orthodontic archwire bending robot systems is reviewed, the key problems in its development are discussed, the key technologies are summarized, and the future trend and the problems needing further research are analyzed. In this article, patents have been discussed on orthodontic archwire.

Multipoint iterative methods with memory are the class of the most efficient iterative methods for solving nonlinear equations since they use already computed information to considerable increase convergence rate without additional computational costs. The purpose of this study is to provide an overview about the multipoint iterative methods with memory by addressing recent patents and scholarly articles on the constructing and application of the iterative method. Numerical experiments are used to demonstrate the efficiency and the performance of the multipoint iterative method. The results show that the multipoint iterative methods are particularly suitable for the high-precision computing.

Study on a Novel Fault Diagnosis Method of Rolling Bearing in Motor by Xiumei Li, Wu Deng, Huimin Zhao, Guanghai Zheng (144-152).
It is important to diagnose the faults of rolling bearings, because they may lead to the failure of motor, and even the entire operating system-related disorders and failures. In order to diagnose the early faults of bearings, a novel method for early diagnosis of rolling bearing faults based on resonance-based sparse signal decomposition and principal component analysis was proposed in the present paper. Firstly, the vibration signals produced from a faulty rolling bearing were split into high and low resonance components using resonance-based sparse signal decomposition. Secondly, the principal components were extracted using principal component analysis, in order to transform the signals into frequency domain. Finally, the results were compared with the theoretical fault frequencies to locate the faulty elements. The proposed method was applied in the experimental data. The experimental results show that the proposed fault diagnosis method can quickly discern the faulty elements of rolling bearings, improve the diagnostic accuracy and provide an overview of the early fault diagnosis of rolling bearings. In this article, recent patents have been discussed.

Background: With the development of high-speed and high-precision rotating machinery, the patents of dynamic balance mechanism have been increasingly applied on rigid rotor system.
Objective: To analyze the unbalance vibration characteristics and design the suitable dynamic balance method for rigid rotor system, the method of modeling and simulation is utilized in the paper.
Method: Based on the principle of rotor dynamics, the mathematic model is built firstly between the vibration response and unbalance excitation. According to double-face dynamic balance principle, the correction of correcting face is made equivalent to the unbalance excitation of the rotor system, and then the mathematic model is developed with double-face correcting function. The matlab language is applied to design the simulation program for the dynamic balance model.
Results: Based on simulation analysis, the relations are analyzed between unbalance vibration response and rotating frequency, influence coefficient and rotating frequency, influence coefficient and axial positions of correcting face in the paper. The analysis results prove that the modeling method for double-face dynamic balance of rigid rotor system is reasonable.
Conclusion: The mathematic model provides a theoretic foundation for further patent technology on the rotor dynamic balance.

Small non-ferromagnetic metal particle and ferromagnetic metal particle could be detected with micro inductive sensor. However, the signal of the inductive sensor is very weak. In order to increase the amplitude of the signal, the relation between the material of magnetic core and the sensitivity of the micro planar inductive sensor is presented in this paper. Simulation models of the micro inductive sensor with different magnetic cores are built with Ansoft software. The simulation results indicate that the magnetic core with high permeability and high conductivity could improve the sensitivity of planar inductive sensor for the detection of both iron particles and copper particles. The simulation results also indicate that the sensitivity of detecting copper particles is increased with the increase in thickness of the iron magnetic core, but the sensitivity of detecting iron particles is decreased with the increase in thickness of iron magnetic core. This paper also introduced the recent patents which are designed to improve the sensitivity of inductive sensor. This research has reference value for the design of inductive sensor.

Critical Speed and Unbalance Response of the Locomotive Motor Rotor by Yuewei Chen, Junguo Wang, Zhanjie Guo (168-176).
Background: Due to the harsh working condition of the locomotive traction motor rotor, two common faults prevail, resonance and unbalance vibration, which might cause instability and even serious accidents.
Objective: The research results of calculating critical speed and analyzing unbalance response are references for dynamic design of the locomotive traction motor.
Method: Certain methods are adopted: modeling of rotor for a locomotive traction motor, calculation of critical speed, influence of support stiffness and analysis of unbalance response are studied. Firstly, the rotor model is established based on the lumped mass method. Then, the critical speed is obtained using Riccati transfer matrix method, and the influence of support stiffness on critical speed is also discussed. Finally, the unbalance response is analyzed to evaluate the accuracy and feasibility of the adopted method in the calculation of the critical speed.
Results: It is shown that the working speed is far lower from critical speed margin and the validity of the solution is verified by analyzing unbalance response and by comparing different calculation methods of the critical speed.
Conclusion: Recent study of patent product on critical speed and unbalance response is investigated to illustrate the method. An analysis of the reviewed patents allows conclusion of the expected future developments in this domain.

Patent Selections: (177-182).