摘要：When a curling rock slides on an ice sheet with an initial rotation,a lateral movement occurs,which is known as the curling *** force of friction between the curling rock and the ice sheet changes continually with changes in the environment;thus,the sport of curling requires great skill and *** throwing of the curling rock is a great challenge in robot design and control,and existing curling robots usually adopt a combination scheme of a wheel chassis and gripper that differs significantly from human throwing movements.A hexapod curling robot that imitates human kicking,sliding,pushing,and curling rock rotating was designed and manufactured by our group,and completed a perfect show during the Beijing 2022 Winter Olympics *** switching between the walking and throwing tasks is realized by the robot’s morphology transformation based on leg configuration *** robot’s controlling parameters,which include the kicking velocity v_(k),pushing velocity v_(p),orientation angle θc,and rotation velocityω,are determined by aiming and sliding models according to the estimated equivalent friction coefficientμ_(equ)and ratio e of the front and back *** stable errors between the target and actual stopping points converge to 0.2 and 1.105 m in the simulations and experiments,respectively,and the error shown in the experiments is close to that of a well-trained wheelchair curling *** robot holds promise for helping ice-makers rectify ice sheet friction or assisting in athlete training.

摘要：In this paper, the effect of the grinding undercut of the raceways on the longitudinal pressure distribution of the profiled rollers, which are the most popular axial profile employed by the bearing manufacturers, was discussed. Based on the profiled roller geometrical equations and numerical calculation of three dimensional elastic contact problems of finite length, a new numerical method for calculating the crown drop evaluation considering the effect of grinding undercut was used. The analyses of two structure case, that roller length is greater or less than raceway width, were carried out and compared with each other. The Results show that the width of grinding undercut must be considered in determining the crown drop of rollers.

摘要：We first design and analyze the contour surface of the globoidal indexing cam with the aid of computer, and then do optimum design according to the requirements of dynamics. Finally, we discuss the problem of the pressure angle of the globoidal indexing cam mechanism in detail and put forward a new concept of equivalent pressure angle.

摘要：纤维技术领域的最新突破促使具有紧密界面的功能材料能够在一维限域空间内精准组装成具有特定几何结构的单根纤维,可用于传感器、能量收集和存储、显示器和医疗设备等.其中,半导体是调节纤维器件性能的关键组件,因此,纤维内部半导体的选择.

摘要：Introduction Mandibular segmental defects result in significant cosmetic and functional ***,the reconstruction of both the contour and function of the mandible is a challenging *** present,autologous vascularized fibula transplantation is the most common method to reconstruct a mandible with long-span defects[1].

摘要：The new mechanism of drum-shaped gear with ring-involute teeth is presented to implement dimensional transmission for the stairlift. The structure of the gear and rack in this actuating mechanism is designed, and then its inherent radius of turn and modulus selection have been studied. In order to make the mechanism move steadily, the drive guide is proposed. After using the dynamics simulation software ADAMS to analyze the 3D model, this kind of mechanism is confirmed to be able to implement dimensional track. The useful method and basis would be provided for the optimization design of the mechanism.

摘要：In many practical structures, physical parameters of material and applied loads have random *** optimize this kind of structures,an optimum mathematical model was *** model has reliability constraints on dynamic stress and displacement and upper & lower limits of the design variables. The numerical characteristic of dynamic response and sensitivity of dynamic response based on probability of structure were deduced respectively. By equivalent disposing, the reliability constraints were changed into conventional forms. The SUMT method was used in the optimization *** examples illustrate the correctness and practicability of the optimum model and solving approach.

摘要：Thermal protection systems are very essential for high temperature thermal conductivity measurement system to reduce the heat loss to environment at the range of 600–1800 K. A compound multi-layer insulations structure which composed of inner carbon fibrous materials and outer alternately arranged alumina fibrous materials and high reflectivity foils is proposed for use in high temperature cylinder thermal protection systems. A coupled conductive and radiation governing equations is presented for heat transfer analysis of the structure. The finite volume method and the discrete ordinate method are used to solve the governing equations. The optimization structure of the compound multi-layer insulations is investigated by considering the pressure of the gas, the density of the carbon fibrous materials, the density of the alumina fibrous materials, the number of reflective foil layers and the emissivity of reflective foils. The results show that the compound structure has the best thermal insulation performance when the pressure of the gas is below 0.01 k Pa, the density of carbon fibrous materials is 180 kg m^(-3), the density of alumina fibrous materials is 256 kg m^(-3) and the number of reflective foil layers is 39. In addition, the thermal insulation performance is much better when the emissivity of reflective foils is lower.

摘要：Currently,osteochondral(OC)tissue engineering has become a potential treatment strategy in repairing chondral lesions and early osteoarthritis due to the limited self-healing ability of ***,it is still challenging to ensure the integrity,physiological function and regeneration ability of stratified OC scaffolds in clinical *** OC scaffolds are attractive to overcome the above problems because of their similar biological and mechanical properties with native OC *** a consequence,the researches on biomimetic design to achieve the tissue function of each layer,and additive manufacture(AM)to accomplish composition switch and ultrastructure of personalized OC scaffolds have made a remarkable *** this review,the design methods of biomaterial and structure as well as computer-aided design,and performance prediction of biopolymer-based OC scaffolds are presented;then,the characteristics and limitations of AM technologies and the integrated manufacture schemes in OC tissue engineering are summarized;finally,the novel biomaterials and techniques and the inevitable trends of multifunctional bio-manufacturing system are discussed for further optimizing production of tissue engineering OC scaffolds.

摘要：Developing Parallel Hybrid Electric Vehicle (PHEV) is becoming an active research field of new type electric automobiles for its high fuel economy and low emissions. Due to the complexity of PHEV powertrain, simulation becomes an important method in study of PHEV control strategy. In this paper, a forward-facing simulation software and the models of PHEV powertrain based on MATLAB/Simulink are developed to study on the PHEV control strategy. The simulation results are also shown in the paper.