Novel high torque bearingless two-sided rotary ultrasonic motor

Applications are limited at present because the currently available ultrasonic motors (USMs) do not provide suffi-ciently high torque and power. The conventional travelling-wave USM needs the bearing to support, which required lubricant. To solve the above problem, a bearingless travelling-wave USM is designed. First, a novel structure of the two-sided USM consisting of a two-sided teeth stator and two disk-type rotors is designed. And the excitation principle of the two-sided travelling-wave USM is analyzed. Then, using ANSYS software, we set up the model of the stator to predict the excitation frequency and modal response of the stator. The shape of the vibration mode was obtained. Last, the load characteristics of the USM are measured using ex-perimental method. The maximum stall torque and the no-load speed were obtained. The results showed that the characteristics of the two-sided USM are better than those of the conventional one-sided USM.

Nonlinear vibration analysis of a circular micro-plate in two-sided NEMS/MEMS capacitive system by using harmonic balance method

In this study, forced nonlinear vibration of a circular micro-plate under two-sided electrostatic, two-sided Casimir and external harmonic forces is investigated analytically. For this purpose, at first, von Karman plate theory including geometrical nonlinearity is used to obtain the deflection of the micro-plate. Galerkin decomposition method is then employed, and nonlinear ordinary differential equations (ODEs) of motion are determined. A harmonic balance method (HBM) is applied to equations and analytical relation for nonlineaT frequency response (F-R) curves are derived for two categories (including and neglecting Casimir force) separately. The analytical results for three cases:(1) semi-linear vibration;(2) weakly nonlinear vibration;(3) highly non linear vibration, are validated by comparing with the numerical solutio ns. After validation, the effects of the voltage and Casimir force on the natural frequency of two-sided capacitor system are investigated. It is shown that by assuming Casimir force in small gap distances, reduction of the natural frequency is considerable. The influences of the applied voltage, damping, micro-plate thickness and Casimir force on the frequency response curves have been presented too. The results of this study can be useful for modeling circular parallel-plates in nano /microelectromechanical transducers such as microphones and pressure sensors.

Effective Hybrid Teaching-learning-based Optimization Algorithm for Balancing Two-sided Assembly Lines with Multiple Constraints

Due to the NP-hardness of the two-sided assembly line balancing （TALB） problem, multiple constraints existing in real applications are less studied, especially when one task is involved with several constraints. In this paper, an effective hybrid algorithm is proposed to address the TALB problem with multiple constraints （TALB-MC）. Considering the discrete attribute of TALB-MC and the continuous attribute of the standard teaching-learning-based optimization （TLBO） algorithm, the random-keys method is hired in task permutation representation, for the purpose of bridging the gap between them. Subsequently, a special mechanism for handling multiple constraints is developed. In the mechanism, the directions constraint of each task is ensured by the direction check and adjustment. The zoning constraints and the synchronism constraints are satisfied by teasing out the hidden correlations among constraints. The positional constraint is allowed to be violated to some extent in decoding and punished in cost fimction. Finally, with the TLBO seeking for the global optimum, the variable neighborhood search （VNS） is further hybridized to extend the local search space. The experimental results show that the proposed hybrid algorithm outperforms the late acceptance hill-climbing algorithm （LAHC） for TALB-MC in most cases, especially for large-size problems with multiple constraints, and demonstrates well balance between the exploration and the exploitation. This research proposes an effective and efficient algorithm for solving TALB-MC problem by hybridizing the TLBO and VNS.

A Heuristic Method for Two-sided Assembly Line Balancing Problem

A two-sided assembly line is typically found in plants producing large-sized products. Its advantages over a one-sided line and the difficulties faced in two-sided line balancing problems were discussed. A mathematical model for two-ALB problem was suggested. A modification of the “ranked positional weight” method, namely two-ALB RPW for two-ALB problems was developed. Experiments were carried out to verify the performance of the proposed method and the results show that it is effective in solving two-sided assembly line balancing problems.

Laboratory Research on Effective Test Area of Short-Crested Waves Generated by Two-Sided Segmented Wavemakers

The size and shape of the effective test area are crucial to consider when short-crested waves are created by segmented wavemakers. The range of the effective test area of short-crested waves simulated by two-sided segmented wavemakers is analyzed in this paper. The experimental investigation on the wave field distribution of short-crested waves generated by two-sided segmented wavemakers is conducted by using an array of wave gauges. Wave spectra and directional spreading function are analyzed and the results show that when the main direction is at a certain angle with the normal line of wave generators, the wave field of 3D short-crested waves generated by two-sided segmented wavemakers has good spatial uniformity within the model test area. The effective test area can provide good wave environments for seakeeping model tests of various ocean engineering structures in the deep ocean engineering basin.

Two-Sided First Exit Problem for Jump Diffusion Distribution Processes Having Jumps with a Mixture of Erlang

In this paper, we consider the two-sided first exit problem for jump diffusion processes having jumps with rational Laplace transforms. We investigate the probabilistic property of conditional memorylessness, and drive the joint distribution of the first exit time from an interval and the overshoot over the boundary at the exit time.

Existence and Uniqueness of Solution to Two-Point Boundary Value for Two-Sided Fractional Differential Equations

In this paper, existence and uniqueness of solution to two-point boundary value for two-sided fractional differential equations involving Caputo fractional derivative is discussed, by means of the Min-Max Theorem.

Two-Sided Stable Matching Decision-Making Method Considering Matching Intention under a Hesitant Fuzzy Environment

In this paper,a stable two-sided matching(TSM)method considering the matching intention of agents under a hesitant fuzzy environment is proposed.The method uses a hesitant fuzzy element(HFE)as its basis.First,the HFE preference matrix is transformed into the normalized HFE preference matrix.On this basis,the distance and the projection of the normalized HFEs on positive and negative ideal solutions are calculated.Then,the normalized HFEs are transformed into agent satisfactions.Considering the stable matching constraints,a multiobjective programming model with the objective of maximizing the satisfactions of two-sided agents is constructed.Based on the agent satisfaction matrix,the matching intention matrix of two-sided agents is built.According to the agent satisfaction matrix and matching intention matrix,the comprehensive satisfaction matrix is set up.Furthermore,the multiobjective programming model based on satisfactions is transformed into a multiobjective programming model based on comprehensive satisfactions.Using the G-S algorithm,the multiobjective programming model based on comprehensive satisfactions is solved,and then the best TSM scheme is obtained.Finally,a terminal distribution example is used to verify the feasibility and effectiveness of the proposed method.

Logarithmic Sobolev Inequalities for Two-Sided Birth-Death Processes

In this paper, we study the logarithmic Sobolev inequalities for two-sided birth-death processes. An estimate of the logarithmic Sobolev constant α for a two-sided birth-death process is obtained by the Hardy-type inequality and a criteria for a is also presented.

Microstructure and properties of Ti-bearing hot-rolled high-strength steel plates for two-sided enameling

The composition and production technology of the type of hot-rolled steel plate used in two-sided enameling were briefly described. The microstructure and mechanical properties before and after enameling were contrastively investigated,and the precipitates in the samples were analyzed using transmission electron microscope and energy dispersive spectrometer. The results show the ferrite grain size of the steel plate after high-temperature enamel firing to be fine,with a large number of TiC and Ti;C;S;precipitates dispersed throughout the ferrite matrix. After two rounds of enamel firing at a temperature range of 800-890 ℃,its yield strength can still reach342 MPa. The results of a hydrogen permeation test show that the hydrogen storage properties of the steel plate are much better than those of ordinary structural carbon steel. A better bubble structure in the enamel layer can be obtained by this steel plate,with no fish-scale defects on the enameled steel-plate surface.

Some Mathematical Properties of the Dynamically Inconsistent Bellman Equation： A Note on the Two-Sided Altruism Dynamics

This article describes some dynamic aspects on dynastic utility incorporating two-sided altruism with an OLG setting. The special case is analyzed where the weights of two-sided altruism are dynamically inconsistent. The Bellman equation for two-sided altruism proves to be reduced to one-sided dynamic problem, but the effective discount factor is different only in the current generation. It is shown that a contraction mapping result of value function cannot be achieved in general, and that there can locally exist an infinite number of self-consistent policy functions of the class C＂ with distinct steady states （indeterminacy of self-consistent, differentiable policy functions）.

Two-Sided Matching Decision Making with Multi-Attribute Probabilistic Hesitant Fuzzy Sets

In previous research on two-sided matching(TSM)decision,agents’preferences were often given in the form of exact values of ordinal numbers and linguistic phrase term sets.Nowdays,the matching agent cannot perform the exact evaluation in the TSM situations due to the great fuzziness of human thought and the complexity of reality.Probability hesitant fuzzy sets,however,have grown in popularity due to their advantages in communicating complex information.Therefore,this paper develops a TSM decision-making approach with multi-attribute probability hesitant fuzzy sets and unknown attribute weight information.The agent attribute weight vector should be obtained by using the maximum deviation method and Hamming distance.The probabilistic hesitancy fuzzy information matrix of each agent is then arranged to determine the comprehensive evaluation of two matching agent sets.The agent satisfaction degree is calculated using the technique for order preference by similarity to ideal solution(TOPSIS).Additionally,the multi-object programming technique is used to establish a TSM method with the objective of maximizing the agent satisfaction of two-sided agents,and the matching schemes are then established by solving the built model.The study concludes by providing a real-world supply-demand scenario to illustrate the effectiveness of the proposed method.The proposed method is more flexible than prior research since it expresses evaluation information using probability hesitating fuzzy sets and can be used in scenarios when attribute weight information is unclear.

城郊宅基地征收中“钉子户”与地方政府的博弈分析——兼论“一把尺子量到底”+“拆迁奖励”政策

在城郊宅基地征收中,“钉子户”和地方政府的行为方式和策略选择将会直接影响土地增值收益分配的情况,并会影响土地征收数量、土地征收成本和社会福利水平。通过构建博弈模型可以得到如下结论:与普通农户相比,“钉子户”能够获得更多补偿的原因有:投入更多的博弈资源,能够忍受或有效规避地方政府惩罚造成的损失,具有博弈成本方面的优势;地方政府实行的“一把尺子量到底”+“拆迁奖励”政策是一种两阶段“最后通牒”策略,可以起到甄别“钉子户”和普通农户的作用,但也使得“钉子户”与地方政府之间的博弈不可避免;在“钉子户”与地方政府讨价还价过程中,与普通农户相比,“钉子户”具有更高的风险承受能力和讨价还价能力,能够获得更多的收益,但依然低于地方政府获得的份额;地方政府可以通过逐步试探的方式对两类农户进行甄别,因此不存在“钉子户”博弈给普通农户带来外部正效应的情况;“钉子户”和地方政府之间的博弈是为了争夺土地增值收益,博弈不是正和博弈或零和博弈而是负和博弈。

考虑碳-绿证市场耦合的多虚拟电厂电-碳P2P交易模型

为了探索多市场交易下虚拟电厂(VPP)之间的点对点(P2P)交易模式,提出一种考虑碳-绿证市场耦合的多VPP电-碳P2P交易模型。建立包含光伏、储能、中央空调、碳捕集机组和用户负荷的多VPP聚合模型,建立绿证-碳配额耦合的VPP交易模型;在此基础上,基于合作博弈理论,建立多VPP社会效益最大化模型,采用交替方向乘子法对模型进行分布式求解,并建立非对称纳什议价模型对合作剩余利润进行分配;通过算例分析验证所提模型能在提升经济效益的同时,减少VPP的CO_(2)排放量。

反思量刑合意的效力

《刑事诉讼法》第201条涉及控辩量刑合意之于法院的效力,其包括实体和程序两个维度。“控辩合意→法院确认”“法院让渡量刑权”等对美国辩诉交易的认识可能存在误差:在法律规范层面,量刑协议对法院并无约束力;即使在司法实践中,美国法院亦对最终量刑有实质影响。将我国《刑事诉讼法》第201条中的“一般应当采纳”解释为量刑建议对法院的刑罚裁判具有约束力,无法通过控审分离准则的正当性检验。从量刑权属之辩回归量刑规律本身,法院采纳量刑建议的实体性标准是“量刑建议适当”;“量刑建议没有明显不当,法院即应采纳”的论断有违法学方法论上的要求;但法院应对量刑建议给予适当包容,这是“一般应当采纳”所内含的一种对法院行使自由裁量权的价值引导。在程序维度上量刑建议对法院具有约束力,即法院拟不采纳量刑建议时不得径行做出裁判。第201条第2款设定的程序控制是以法院的告知义务为重心。法院负有告知检察机关调整量刑建议的义务,更为关键的是法院对被告人的告知义务。一审法院违反告知义务是否导致发回重审的后果,二审法院应基于辩护权保障做实质判断。

基于Bargain经济模型的网格资源交易管理算法

该文针对计算网格的特点,提出了一种基于Bargain经济模型的网格资源交易管理算法:首先描述了分层的网格协议体系;接着,给出了计算网格资源管理的Bargain经济模型;然后依据对策论,提出了交易管理算法,它包括3个成分:局中人,策略集和赢得函数;最后,定义了经济模型的平衡局势,并给出了求解最优纯策略的算法。

基于迭代Bargaining策略优化服务合成执行路径

服务质量(QoS)是优化服务合成执行路径的关键研究内容,当前绝大多数存在的方法很少注意到商业环境下服务商之间存在的隐性竞争压力可能会迫使服务商动态改变他们的QoS值以至于合成优化执行路径发生改变。针对此问题,提出一个基于迭代Bargaining策略的约束违背纠正方法。该方法使用本地最优化策略,在没有考虑用户QoS约束的情况下建立一条最优执行路径。对此路径,全局QoS计算模型和全局约束违背检查模型能找出所有发生的约束违背。一个迭代的Bargaining策略被递归作用于关键路径执行节点,使得更好服务提供商被选出替换原有执行节点,从而一个优化的执行路径能被重新建立以满足用户综合的QoS约束需求。

基础设施BOT(build-operate-transter)项目特许权期决策的Bargaining博弈模型

特许权期是基础设施BOT项目融资建设中的一个重要决策变量,但目前缺乏计算特许权期的理论方法.SHEN等建立了特许权期的决策模型(BOTCc M),得出了特许权期的可行区间,但BOTCc M模型未能提供在该区间内选择具体的特许权期时间点的方法.这是该模型在应用中的一个重要缺陷,需要进一步改进和完善.应用博弈论原理,建立了特许权期决策的Bargaining博弈模型,克服了BOTCc M模型的缺陷,求出了特许权期决策的具体时间.最后,通过算例演示了特许权期决策的Bargaining博弈模型.研究结果表明,Bargaining博弈模型能为政府和企业进行特许权期决策提供有效的计算方法.

基于Nash-Bargaining的区域内水权交易合作议价模型研究

针对江苏省水量水质双缺型水资源冲突问题,基于准市场交易模式,考虑水权交易决策主体各自议价能力,引用合作博弈理论方法,构建区域内跨行业水权交易Nash-Bargaining议价模型,并给出准市场条件下水权交易的最优价格。以江苏省工业、农业之间跨产业水权交易为例开展实例研究,分析交易水量、议价能力对水权交易价格的影响。研究成果表明:水权交易总量与水权交易单价呈现正向相关关系,但水权交易单价存在上限,价格天花板受政府部门调控影响;水权交易能够有效提升江苏省工农业主体的收益,同时交易水量与交易价格的升高均能够有效提升江苏省整体社会福利;在高交易水量情况下,水权交易购买方的议价能力对提升水权交易整体福利具有更强的作用。

含产消者租赁共享储能的主动配电网协同优化决策

共享储能作为一种新兴储能运营模式,在降低产消者投资成本、提高储能利用效率等方面发挥了重要作用。但是,当前产消者彼此间以及其与共享储能运营商之间的复杂交互和利益竞争加剧了主动配电网优化调控的难度。因此,提出一种含产消者租赁共享储能的主动配电网协同优化决策方法。首先,构建了一种考虑配电系统运营商、产消者和共享储能运营商间交互影响的多主体协同交易框架。其次,建立了计及共享储能参与的点对点电力共享交易机制,并据此提出了产消者租赁共享储能的两阶段定价策略,采用议价因子指标量化价格制定过程中各主体的议价能力。然后,建立了基于改进纳什议价的主动配电网博弈优化模型,在指数项中引入议价因子用以设定其在目标中的权重,实现收益的合理分配。最后,采用改进的IEEE 33节点配电系统进行算例仿真,验证了所提方法的有效性。