Integrated Design Scheme Research Articles

Multi-objective optimization design of power pack structures based on floating projection topology optimization

Battery packs are vital components for storing and releasing energy. However, during driving, the intensity of heat emission and mechanical performance of electric vehicles are interrelated but conflicting indicators. To address this problem, this study topologically optimizes the power pack support structure with multiple objectives of minimizing compliance and heat dissipation, aiming to achieve a comprehensive and integrated design scheme. A floating projection topology optimization (FPTO) method is proposed, which normalizes the objectives of structural compliance and heat dissipation and derives the sensitivity. FPTO demonstrates superior objective function values and smoother topology configuration compared to the solid isotropic material with penalization (SIMP) method. Finally, the proposed method is applied to the power pack support structure. The results demonstrate that the method obtains a design solution with excellent mechanical performance and high heat dissipation performance with a suitable trade-off. The lightweight design of the overall structure of the battery pack is achieved.

Double-Sandwich Magnetic Coupling Structure Design for Dual-LCL Wireless Charging System in EV Applications

In the wireless charging system of EVs, the traditional single-stage LC resonance network has the issues of narrower of parameter design and small equivalent input impedance. While the composite resonant network will introduce additional resonant capacitors and inductors, which increases the system volume, cost, and reduces the efficiency. This paper proposes a design scheme of double-sandwich magnetic coupling structure with a low cross-coupling coefficient, which integrates the resonant inductors into the power transmitter and receiver, and it is designed taking the magnetic leakage and loss as constraints. A 500W prototype is built, and the comparison of experimental efficiencies between the double-sandwich and the separate magnetic coupling structures is performed. Finally, the effectiveness of the integrated design scheme is validated.

An Integrated Design Approach for Fault-Tolerant Control of Switched LPV Systems With Actuator Faults

In this article, the active fault-tolerant control (FTC) issue is addressed for switched linear parameter varying (LPV) systems in the discrete-time domain. A general dwell-time property is considered in the system setup to govern the switching dynamics between subsystems, and the parameter variations within each subsystem are subjected to the polytopic uncertainties. The main innovation of the developed active FTC approach is to effectively cope with switched LPV models where both input and output matrices can be of parameter-dependent form. By virtue of a novel Lyapunov function approach depending on both dwell time and parameter variations, the joint task for fault detection, estimation, and compensation is fulfilled via an integrated design scheme. The input-to-state stability (ISS) conditions are obtained for the augmented faulty system satisfying a given ISS-gain performance requirement. The desired effect of active FTC is achieved in three critical steps: 1) construct a fault detection filter in terms of the <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$\mathcal {H}_{\infty }$ </tex-math></inline-formula> norm; 2) design an observer-based estimator to estimate the system states and faults simultaneously; and 3) synthesize a fault-tolerant controller with the LPV structure using the estimated states and faults for fault compensation. Finally, an application example is utilized to illustrate the efficiency and availability of the proposed control approach.

A Mode-Matched DRG Realized by Monolithic Integrated Interface Circuit Design

This article proposes a novel design method for the mode-matched disk resonator gyroscope (DRG) realized by the monolithic integrated interface circuit. The mode-mismatched dynamics model of DRG is simplified by introducing the analysis method of “slow” dynamics, the effect of mode mismatching is quantified, and the automatic mode-matched interface circuit is designed based on the analysis of the simplified model. The force-rebalance loop is designed based on a self-clock circuit that releases the chip from the dependence on external clocks, avoids the design of multipliers, analog-to-digital converters (ADCs), and digital-to-analog converters (DACs), and improves the integration of the chip. The highly integrated automatic mode-matching loop is realized by the designing of a quadrature loop and stiffness tuning loop on the basics of the mode-matching theory. The design method is applied to develop a monolithic integrated interface chip of DRG with an area of 4.2 mm <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$\times4.3$ </tex-math></inline-formula> mm and power consumption of 90 mW. The DRG integrated circuit achieves the bias instability (BI) of 0.38°/h and the angle random walk (ARW) of 0.0354°/ <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$\surd \text{h}$ </tex-math></inline-formula> within a full scale of ±300°/s, which provides a highly integrated circuit design scheme for DRG’s extensive application.

Research on the Safety of Intelligent Vibration Control System for Electric Vehicle Suspension

Aiming at the problem of poor vertical vibration performance of electric vehicles, an integrated design scheme of electric vehicle suspension based on in-wheel vibration damping system is proposed, and the fuzziness between vehicle suspension and in-wheel vibration damping system is carried out for this scheme. control. Then, the LQR control method based on particle swarm optimization weight coefficient is adopted, and the LQR optimization controller is designed to comprehensively control the electric in-wheel vibration damping system and the vehicle suspension, and further optimize the vehicle ride comfort and electric wheel vibration performance. The simulation results show that the inversion control strategy based on the reference model can effectively suppress the vertical motion of the body, reduce the vertical acceleration of the body, and at the same time reduce the tire deformation to a certain extent, and improve the ride comfort and driving stability of the car.

Magnetic Field Model of Macro-motion of Coaxial Integrated Macro-micro Composite Actuator

Aiming at the problem of short stroke of giant magnetostrictive actuator (GMA), a design scheme of coaxial integrated macro-micro composite actuator is proposed by combining the long-stroke characteristics of voice coil motor with the high-precision characteristics of giant magnetostrictive actuator. Based on its structure composition and working principle, the magnetic field model of macro-motion of macro-micro composite actuator is established based on the analysis method of circuit, and the change characteristics of the driving magnetic field are obtained. The finite element method is used to verify the magnetic circuit characteristics. The results show that the magnetic circuit variation characteristics of the proposed coaxial integrated macro-micro composite actuator are consistent with the theoretical calculation results, and are consistent with the expected working process of this actuator, which indicates that the established magnetic field model is correct, and that the proposed coaxial integrated design scheme of the macro-micro composite actuator is feasible.

Integrated Design of Fault Estimation and Fault-Tolerant Control for Closed-Loop Systems With Uncertain Short Delay

In this paper, an integrated design scheme of fault estimation (FE) and fault-tolerant control (FTC) is presented for a closed-loop system with uncertain short delay. Firstly, a closed-loop system with uncertain short delay is modeled as a system with uncertain parameters, and a bi-directional robustness interaction of uncertainty between the observer and the control system is analyzed. Then a fault estimation observer and a fault-tolerant controller are constructed, and the integrated design problem is converted into a robust control problem for the augmented system under $H_{\infty }$ performance index. Furthermore, the parameters of the fault estimation observer and fault-tolerant controller are solved by Lyapunov function and relaxation methods. Finally, the effectiveness and superiority of the proposed method are verified by an aircraft simulation.

Public Landscape Design for Residential Neighborhood in Coastal Areas

The quality of public landscape design for residential neighborhood has a direct impact on the living comfort of the neighborhood and the life quality of the residents. To improve our citizens’ living standards, this paper summarizes the current status and ideas of public landscape design for residential neighborhood in Hangzhou city, Zhejiang province, China, with the landscape design scheme of Qiaosi-II River as an example, this paper gives a discussion on the strategies for the public landscape design of environmental-friendly residential neighborhood in coastal areas, and the research results show that there are many problems with the public landscape environment in the residential neighborhood of Hangzhou city, to cope with these problems, this paper proposes a few detailed countermeasures for the public landscape design of multi-story and high-rise residential building neighborhood. From a global view, the landscape design scheme of Qiaosi-II River is an integrated design scheme of buildings and landscapes in various regions such as commercial area, health care area, fitness area, green area, and play area for kids, etc. The research in this paper provides a theoretical basis for the public landscape design of safe, comfortable, and livable residential neighborhood in coastal areas.

Design and Analysis of a Novel Integral Design Scheme for Finding Finite-Time Solution of Time-Varying Matrix Inequalities

Solving linear inequalities is widely used in various fields, and it plays a more and more crucial role in practical engineering applications. However, the existing recurrent neural network models to solve this problem only achieve global convergence without any noise. To overcome this disadvantage, in this article, we propose a novel integral design scheme for finding the robust solution of time-varying matrix inequalities. The core idea of this model is to add an integral term in the construction of the error function to make the model have error memory, so as to eliminate static difference. Meanwhile, appropriate activation functions (AFs) are used in the integral term noise-tolerance zeroing neural network (ITNTZNN) model, which can make error function accomplish finite-time convergence. The noise tolerance property of the ITNTZNN model is proved by theoretical analysis, and the upper limit of convergence time is obtained. Numerical simulative results ulteriorly verify the finite-time and noise-tolerant properties of the ITNTZNN model.

Integrated Design Scheme of Coastal Urban Planning Based on GIS Method

Wang, Y. and Yu, S., 2020. Integrated design scheme of coastal urban planning based on GIS method. In: Yang, Y.; Mi, C.; Zhao, L., and Lam, S. (eds.), Global Topics and New Trends in Coastal Research: Port, Coastal and Ocean Engineering. Journal of Coastal Research, Special Issue No. 103, pp. 328–332. Coconut Creek (Florida), ISSN 0749-0208.In order to improve the feasibility of the overall design scheme of coastal urban planning, a general design scheme of coastal urban planning based on Geographic Information System (GIS) is proposed. This paper constructs a geographic information analysis model, which combines information fusion with large data information processing methods, and carries out geographic information data fusion and processing analysis of coastal urban planning. According to the distribution attributes of the data, the collected geographic information data are clustered. Fuzzy C-means clustering method is used to realize coastal urban planning geographic information data fusion clustering. Based on the adaptive correlation integral matching method, the geographic information data clustering centers of coastal urban planning are searched to realize data correlation mining. Principal component analysis is used to mine the key information of coastal urban planning and clustering, and to guide the optimal design of coastal urban planning. Finally, the software is designed and simulated. The results show that the method is effective in the overall design of coastal urban planning. Through GIS geographic information fusion and dispatch, the feasibility of coastal urban planning and design is improved.

Integrated design scheme for fault sample size determination and allocation

Integrated design scheme for fault sample size determination and allocation

Research on Key Problems of Seismic Design of Soft Foundation of Large Pumping Station

Based on the large-scale pumping station project of Suining Second Station, the seismic design theory of large-scale pumping stations on soft foundation is studied in this paper. A 3D fluid-structure interaction simulation model of pumping station- foundation- water is established. It can simulate the soil dynamic characteristics of the foundation and the contact nonlinearity of the opening and closing between different structures during strong earthquakes. A semi - underground structure integrated design scheme is finally proposed in this paper: the steel plates pressed together are used to connect the pumping station body, the maintenance room and the control room. The scheme with a combination of the underground continuous wall, bolts and bored piles for foundation reinforcement is proposed. And then a similar semi - underground structure is constituted. It turns out the design scheme has greatly improved the seismic performance of the Suining Pumping Station and solved the key technical problems of the seismic design of large pumping stations on soft foundation.

Fuzzy Observer-Based Fault Detection Design Approach for Nonlinear Processes

This paper is concerned with the analysis and integrated design of a type of observer-based fault detection (FD) system for general nonlinear processes. To this end, the existence and design condition for this type of nonlinear observer-based FD systems is first introduced. In this context, the integrated design scheme is investigated by dealing with the design condition with the aid of Takagi–Sugeno (T–S) fuzzy dynamic modeling technique. To be specific, the universal T–S fuzzy observer-based residual generator is developed via fuzzy Lyapunov functions. Subsequently, an integrated observer-based FD scheme is proposed with an embedded dynamic threshold, which is generated to meet the real-time FD requirements from industrial processes. In the end, a numerical example and case simulation study on a continuous stirred tank heater process are performed to show the application of the proposed method.

Research on SAR data integrated processing methodology oriented on earth environment factor inversions

ABSTRACTAs an important advanced technique in the field of Earth observations, Synthetic Aperture Radar (SAR) plays a key role in the study of global environmental change, resources exploration, disaster mitigation, urban environments, and even lunar exploration. However, studies on imaging, image processing, and Earth factor inversions have often been conducted independently for a long time, which significantly limits the application effectiveness of SAR remote sensing due to the lack of an overall integrated design scheme and integrated information processing. Focusing on this SAR application issue, this paper proposes and describes a new SAR data processing methodology – SAR data integrated processing (DIP) oriented on Earth environment factor inversions. The simple definition, typical integrated modes and overall implementation ideas are introduced. Finally, focusing on building information extraction (man-made targets) and sea ice classification (natural targets) applications, three SAR DIP methods and experiments are conducted. Improved results are obtained under the guidance of the SAR DIP framework. Therefore, the SAR DIP theoretical framework and methodology represent a new SAR science application mode that has the capability to improve the SAR remote sensing quantitative application level and promote the development of new theories and methodologies.

Formation control of networked multi-agent systems based on a novel event-triggered transmission strategy

In this paper, the formation control problem of networked multi-agent systems (MASs) with communication constraints is investigated. Firstly, a novel event-triggered transmission strategy is proposed to ensure both communication performance and control performance of the system. Secondly, a leader-following formation control strategy is designed to transform the formation control problem into the stability problem of a closed-loop system with time-varying delay. Thirdly, an integrated design scheme is developed to achieve the parameters of the new event-triggered transmission strategy and the control protocol simultaneously by using Lyapunov-Krasovskii function and linear matrix inequality (LMI) technique. Finally, a simulation example is provided to illustrate effectiveness of the proposed method.

一种利用激光干涉非接触式测量玻璃厚度的新方法

本文提出一种结合激光与计算机实现非接触式测量玻璃等透明物体厚度的新方法。该方法基于迈克尔逊干涉仪，利用转动待测样品造成干涉条纹移动间接测量样品厚度，对器件要求较低，操作简便且不会对待测样品造成损坏。在大学物理实验室条件下，该方法测量精度即可达到0.1 mm。在此基础上，本文还提出了一套封装一体化改进设计方案，有利于提高便携性、测量便利性与精度。 A new non-contact method with laser and computer employed has been proposed in this paper, which could be applied to measure thickness of transparent objects, such as glass. The method, which had lower requirement for components and manual operations, was based on Michelson interferometer and would not cause damage to test samples. Under the conditions of college- physics laboratories, its precision could reach 0.1 mm. In addition, a new set of integrated design scheme, which might help improve equipment portability, measurement convenience and precision, was put forward.

Structure-material integrated design by level sets

This paper proposes a structure-material integrated design method in the framework of level sets. A two-scale optimization is performed, where not only is the structural configuration optimized, but the effective properties of the constituent material are also designed by optimizing the configuration of the periodically-arranged microstructures. In this way, the approach can simultaneously generate optimized material distribution patterns as well as optimized materials. Due to the fact that the level set method produces material-void solutions only, the obtained material is uniformly distributed over the material regions of the structure in a strict sense. Three numerical examples are presented to validate the proposed method. The obtained optimal solutions illustrate that whether to design material cells or to optimize structural configurations to achieve the best structural performance would be problem dependent, and thus further demonstrate the necessity and validity of the integrated design scheme.

Integrated versus two-loop guidance-autopilot for a dual control missile with high-order aerodynamic model

This paper proposes a novel integrated guidance and autopilot design scheme for endo-atmospheric missiles having forward and rearward aerodynamic controls. The missile aerodynamic, including the aero-coupling effects between the canard and tail sections, is assumed to be non-linear. The value of the integrated design scheme is that it is solved in finite-time horizon to target interception, while maintaining missile angle of attack, canard and tail incidence angles within their aerodynamic limitations. The integrated design includes a feed-forward command generator based on the dual control missile trim conditions. The proposed design scheme is compared against a two-loop approach. The test cases via simulations are promising, achieving reduced control efforts and lower miss distances with the integrated logic.

Dual scheduling and quantised control for networked control systems with communication constraints

A novel integrated design scheme of average dwell time scheduling strategy, dynamic bandwidth allocation policy and quantised control for a collection of networked control systems (NCSs) with time delay and communication constraints is proposed in this paper. A scheduling policy is presented to accommodate the limitation of communication capacity which depends on the convergence rate of closed-loop system and divergence rate of open-loop plant. Linear programming technique is adopted to dynamically allocate bit rate for each node and the strategy is used to make trade-offs between the network utilisation and the control performance which provides an effective way of optimising the quality of control (QoC) and the quality of service (QoS) for NCSs. Mid-tread uniform quantisers update the quantisation rules according to the assignment of the bit rate and convert the quantised state into a kind of input saturation with bounded disturbances. Taking into account the effect of dual scheduling strategy and quantisation, the NCSs are modelled as discrete-time switched systems with bounded disturbances. Furthermore, a scheduling and quantised feedback control co-design procedure is proposed for the simultaneous stabilisation of the collection of networked subsystems. Finally, a simulation example is given to illustrate the effectiveness of the proposed method.

Research and Development of Solar Energy Automatic Bird Expeller Device

In respond to the national energy saving, emission reduction, and development and utilization of new energy, and with the objective of practical application, a set of solar energy automatic bird expeller device is designed with solar photovoltaic technology, singlechip technology, and digital voice technology. The paper proposes systematic integral design scheme, and focuses on the description of system hardware and software design. The bird expeller device designed is energy-saving, environmentally-friendly, convenient to use, and has good application prospects.