The strong noise produced by centrifugal pump during operation will do harm to the health of workers and pump group. In order to realize the low noise operation of centrifugal pump, researchers add structure to the blade to realize the centrifugal pump noise reduction. At present, in the research of centrifugal pump noise reduction, pit structure and sawtooth structure are the most reprlesentative. Pit structure is for broadband noise reduction, sawtooth structure is for discrete noise reduction. From a macro perspective, if the two structures are coupled, it is likely to bring greater noise reduction. Therefore, in this paper, sawtooth structure is installed on the trailing edge of the pitted blade, and the internal flow field and sound field of the blade are studied, and the influence of the coupling structure on the external characteristics, acoustic amplitude-frequency characteristics and flow field structure of the centrifugal pump is analyzed. The results show that the coupling structure is greatly affected by the sawtooth structure, which makes the pit structure lose the original broadband noise reduction effect, and the two noise reduction mechanisms are different, which makes the pit and sawtooth structure incompatible.

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So far,

design has mainly been applied to support functional solutions. In recent times, subjective aspects in product quality become increasingly important to users, too. Under the aspect of targeting a sustainable value creation for users, design may also help to better address users’ subjective needs in product design. Therefore, a new methodology is presented. Its first step is the numeric and perception-related investigation of main geometrical criteria in object shape changes between technical solutions and their models. The second step is the identification and utilization of impressions analogies between the two domains. Thus subjective similarities between the product and its model are examined both in geometrical and in impressions respect in order to derive implications for the field of Emotional Bionics. The methodology is explained in detail by applying a pilot study.

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We constructed the mandibular condyle scaffold composite with Chitosan, polycaprolactone and hydroxyapatite CS-PCL-HA and investigated the feasibility in condylar tissue engineering applications. The condyle mold was fabricated by resin materials with rapid prototyping methods and the mandibular condyle scaffold was constructed by solution casting-ice drain. The microstructure, porosity, infrared and X-ray diffraction of the condyle scaffold were studied. The exterior of scaffold was white and hard as condyle, consisting of cartilage scaffold and subchondral bone scaffold. The scanning electron microscopy showed that the scaffold composite were highly in three-dimensional structures with 70-85 % porosity and 40-200 μm aperture, which can be controlled by the size and the number of ice particles. Infrared spectrum showed that with the reduction of HA content, the peak strength also decreased, while X-ray diffraction results demonstrated that with the increase of HA content, the diffraction intensity reduced relatively. The compressive strain and bending strain were increased with the growing of the HA content. In conclusion, the special design of scaffolds has good performance of synthetic materials, which is expected to be applied in autologous tissue engineering as condyle scaffold material.

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The sawtooth structure has a good noise reduction effect on the middle and low frequency flow noise, but the current researches mostly focus on the airfoil noise reduction with limited sawtooth number, ignoring the search for the noise reduction law of the sawtooth structure parameters. In this paper, four structural parameters, including tooth number, height to width ratio, passivation ratio and angle of flow cut, are selected to study the optimization design of sawtooth airfoil by numerical calculation method. A noise reduction method for sawtooth airfoil optimization is proposed, and the sawtooth parameters with the optimal noise reduction effect are found. In this paper, the total sound pressure level is taken as the optimization objective, and the neural network algorithm fitting and adaptive simulated annealing algorithm are employed to optimize, and the rationality of the prediction results is evaluated by the method of manual supervision. The results show that the sawtooth number has the most obvious effect on the airfoil noise reduction effect, and the total sound pressure level after optimization is reduced by 0.55dB compared with that before optimization, and the noise reduction effect is mainly concentrated near the trailing edge of the airfoil.

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Oil-contaminated water is a global problem that degrades the quality of water sources and poses a threat to human health and many ecosystems. Oil spills and the discharge of oily industrial wastewater seriously damage ecological environments. Thus, research into high-efficiency, energy-saving oil/water emulsion separation membrane materials is of great significance. Inspired by the hydrophobic mechanism of lotus-leaf surface, we used electrospinning/electrospraying technology to construct oil/water separation membranes with a nanofiber/microsphere bilayer structure consisting of polyvinylidene fluoride (PVDF) and fluorinated polyurethane (FPU). The inclusion of microspheres not only endowed the membrane material with a bilayer composite structure but greatly improved the hydrophobicity of the fiber membrane, achieving water contact angles of 150.2° and 159.1° in air and oil, respectively. Furthermore, the novel biomimetic separation membranes exhibited impressive self-cleaning performance for water-in-oil emulsions and excellent oil/water separation performance: the surfactant-stabilized Span80/diesel/water emulsion in the oil/water separation test reached 24 800 L m^‒2 h^‒1 bar^‒1 with a separation efficiency of over 99.5%. Moreover, even after 50 cycles of use, the lotus-leaf

separation membranes maintained their excellent oil/water separation ability, meeting long-term recycling requirements. The oil/water separation and recycling performance of the lotus-leaf separation membranes demonstrate their promising application in the field of oily wastewater treatment.

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In this paper, we newly propose a microarm which has a joint for medical application, especially for minimally invasive surgery. The novel design of joint has a characteristic of the stiffness anisotropy of insect legs, and comprised of several materials which have different stiffness characteristics. The advantages of proposed joint are as follows: (1) small, (2) flexible, (3) simple mechanism fabricated by stacking microassembly process, and (4) biocompatible. First of all, we designed the microarm based on analytical approach and confirmed that the joint structure can be realized by using materials with wide range (10⁴ times different) of stiffness. Considering the material properties and machining accuracy, we determine the using of SU-8 (negative photoresist) and PDMS (polydimethylsiloxane) as materials of designed microarm. The structure of the microarm was fabricated by stacking layers with the micropattern by using photolithography techniques. By using this structure, we confirmed that the movement of the fabricated joint was successfully performed as designed and the developed joint has a potential for application of endoscopic surgery such as endoscopic sub-mucosal dissection (ESD).

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In practical working environments, quadruped robots encounter significant challenges due to terrain variations, with sloped terrain being among the most common and difficult to navigate. Designing robotic structures specifically for sloped terrains offers an effective solution to the challenges posed to conventional machinery and human labor. Inspired by the goat's superior balance and climbing ability, largely attributed to its body-limb structure and efficient locomotion, the body structure, transmission system, and center of mass adjustment mechanism of a goat-inspired quadruped robot were designed based on caprine anatomy. RecurDyn V9R2 was used to simulate the multi-body dynamics of the quadruped robot during slope locomotion. The simulation results show that the three-segment body generates periodic inter-segment rotation and torsional-spring torque during slope transition, indicating its potential to attenuate low-frequency body pitching and terrain-transition disturbances. In addition, under a prescribed horizontal disturbance on a 15° straight slope, the robot with the active COM slider recovered its forward motion, whereas the fixed-slider case lost stability.

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design has been broadly used in product design as a catalyst to evoke young consumer pleasure. The aim of this study is to develop a model for the development of a product in order to evoke consumer pleasure. The Pleasurable Products Design Model (PBPDM) was developed in this paper based on the results of research and a review of the literature. A case study and experiment were conducted to support this design model. The findings show that practitioners valued both the 'user concerns board' and ' image board' as effective and affective tools to communicate ideas and define design criteria, and to further develop concepts and form generation. ELM was also found to be a valuable tool for inspiring lateral thinking when performing ideation towards pleasure.

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There are few artificial organ models that reproduce physical properties such as hardness, softness, and surface friction characteristics. We have developed

Humanoid, which is an elaborate human model equipped with sensors and actuators to serve as a substitute for and test animals. Humanoid uses artificial materials to precisely recreate the structure of the human and to mimic physical property of the human. The Humanoid can be used, for example, to quantify the requirements of medical doctors, assess surgical skills, replicate physical constraints for the development of a medical device, and provide young surgeons with training opportunities. These results will be expanded to other industries as well to realize a new industrial revolution. Humanoid and its elemental technologies on eye surgery will be introduced and discussed for future medical innovation.

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Along with technological innovation of rapid prototyping, an artificial organ model with high shape and color reproducibility has become relatively easy to prepare and obtain. However there are few artificial organ models that reproduce physical properties such as hardness, softness, and surface friction characteristics. This study proposes to use “

Humanoid” to quantitatively understand qualitative sensory expressions and quickly deliver technology seeds to society by eliminating trial and error. The Humanoid is an elaborate model of a human body equipped with sensors, to quantify such sensory expressions. The Humanoid can be used, for example, to quantify the requirements of medical doctors, assess surgical skills, replicate physical constraints for the development of a medical device, and provide young surgeons with training opportunities. We here describe a design concept and a prototype development of Humanoid.

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　The hydraulic quadruped

robot has great carrying capacity, moving performance and environmental adaptiveness, making the hydraulic robot become an important branch of the robot systems. The hydraulic drive unit brings about the high performance and also enhances the difficulty in controlling the system at the same time: load disturbance can produce great influence for hydraulic drive control performance. In order to ensure the robot can keep good stability on various complex road environment, establishing a single leg control system to achieve the complex load characteristic test of the robot is needed, and the high performance control method should be studied. A single leg mechanical entity model of the hydraulic robot in ADAMS needs to be established and the hydraulic control system model of the hydraulic drive unit in MATLAB/Simulink, and through the collaborative simulation method to get single leg machine-fluid-electric combined with simulation model.

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Since the term '' was coined in 1960, there were a number of technological products invented that have had deeply influenced the human societies; however, comparing with the achievements in technology, bionics in design seemingly being nearly 'uncivilised' with very rare establishments on related expertise. Henceforth, this study conducted an experiment to understand: 1. if design methods helpful to creative design; 2.what is the process and critical elements of design; 3. the effect on design thinking with different forms of biological knowledge. The experiment conclusions are: 1. the innovative, varied works made by the subjects are given in the same biological material, proves the positivity of bionics to creative design; 2. four types of design thinking process and sixteen critical elements are inducted, and thirteen in which are drew as the consensus map; 3. sense of motion of designers would be enhanced if provided with dynamic material.

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A well-mimicked human model is useful to improve surgeon's skill of complicated surgeries and to evaluate new medical devices. The human model with artificial organ modules is expected not only to mimic anatomical characteristics and mechanical properties of a human, but also to be integrated with sensors for quantitative evaluation of skills, we called the human model, “

-Humanoid”.
Here, we focused on an eye surgery and proposed an eye model which is eye part of -Humanoid. For training the ILM peeling task using micro forceps in retinal surgery, fundus part of the eye model has an artificial retina and inner limiting membrane (ILM) which is superficial layer of the retina. We then succeeded to establish an artificial eye with fundus part having artificial ILM which can be peeled by micro forceps, and it was assembled in an artificial skull of the Humanoid.

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