模式转换环形耦合振动超声辐射器

提出了一种新型耦合振动环形超声辐射器,辐射器由纵振换能器及变幅杆激励特定尺寸的金属圆环,使其能有效地将纵向振动转化为圆环的径向轴向耦合振动从而向环的径向、轴向辐射超声波,并且在环的中心形成聚焦声场。推导了该辐射器的等效电路,给出了等效电路法和有限元法优化设计环形超声辐射器的详细过程。研究了耦合振动环形超声辐射器的谐振特性及其辐射声场特性,根据理论计算结果加工了相应的环形超声辐射器,实验测试结果与理论计算结果符合得较好。本文提出的模式转换环形耦合超声辐射器可望在声化学等液体处理领域获得应用。     

模式转换弯曲振动超声换能器的研究

本文研制了一种由纵向振动夹心式压电换能器和弯曲振动细棒组成的纵一弯模式转换弯曲振动超声换能器，从理论上分析了此类换能器的两种振动模式，井推出了其共振条件．实验表明，换能器共振频率的测量值与理论值符合很好，弯曲振动换能器的能量转换效率较高，性能稳定，在实际生产中具有广泛的应用．     

新型柱孔式模式转换型纵-扭复合模态超声振动系统*

为了改善基于螺旋槽结构和斜槽结构的模式转换型纵-扭复合模态超声振动系统存在的结构复杂、扭转分量较小等问题,论文提出了基于新型柱孔式复合变幅杆的模式转换型纵-扭复合模态超声振动系统,并利用有限元法和数据分析对其进行了仿真分析,结果表明,引入新型柱孔式复合变幅杆的系统的输出端面的剪切应力、旋转角度得到了大幅提升,能够有效地提高纵、扭振动的转换效率。     

大负载超声振动磨削系统的设计

设计了一种大负载超声振动磨削系统,超声系统由换能器、圆柱圆锥形变幅杆和轮辐式砂轮组成。首先将轮辐式砂轮等效成轮毂为圆柱杆、辐板与轮缘为中厚板的复合模型,利用各接触面边界连续的条件推导系统的频率方程,完成了超声磨削系统的设计,制作了实验装置并分析验证了其声学振动特性。实验结果表明:利用轮辐式砂轮复合模型求解系统频率方程,在解决大负载超声振动磨削系统设计难题上的有效性。该超声系统结构简单,声学振动特性稳定,可输出均匀的位移振幅,有望在大负载的超声磨削领域获得应用。     

大负载超声振动磨削系统的设计

设计了一种大负载超声振动磨削系统,超声系统由换能器、圆柱圆锥形变幅杆和轮辐式砂轮组成。首先将轮辐式砂轮等效成轮毂为圆柱杆、辐板与轮缘为中厚板的复合模型,利用各接触面边界连续的条件推导系统的频率方程,完成了超声磨削系统的设计,制作了实验装置并分析验证了其声学振动特性。实验结果表明:利用轮辐式砂轮复合模型求解系统频率方程,在解决大负载超声振动磨削系统设计难题上的有效性。该超声系统结构简单,声学振动特性稳定,可输出均匀的位移振幅,有望在大负载的超声磨削领域获得应用。     

超声振动切削系统中弯曲振动刀杆的谐振模式

本文运用系统的观点研究了超声振动切削系统中弯曲振动刀杆的谐振模式及与其它子系统谐振频率的关系,发现在一定条件下,处于系统中的刀杆可以按照自身的固有频率谐振,其刀尖振幅足可以满足工程的需要,这样在实际中就允许刀杆存在一定量的设计、制造误差及重磨量,从而带来极大的方便。本文结果也从弯曲振动系统的另一侧面进一步映证了文献[6]结论所具有的普遍性。     

锥变截面管形超声振动系统的设计

设计了一种锥变截面管形超声振动系统,振动系统由夹心式压电换能器和锥形变截面金属圆管组成。推导了锥变截面管形超声振动系统的等效电路和谐振/反谐振频率方程。利用等效电路法、有限元法对锥变截面管形超声振动系统进行了分析设计并制作了相应的实验样品。研究结果表明,锥形变截面管的等效电路为一种新型的非互易二端口等效网络;锥变截面管形超声振动系统具有较好的频率隔离性、较大的位移振幅和均匀的振动位移输出。该超声振动系统可望在超声连续缝焊、环形部件的超声切割和超声钻孔等领域获得应用。     

超声振动车削装置设计

在切削加工领域，提高加工精度方法很多，其中一个非常重要的研究方向在于努力减小切削过程中的切削力和切削热。超声振动切削技术在降低切削力和切削热方面有重要的作用，可以较好地解决难加工材料、难加工零件以及精密加工等方面的一些工艺问题。为了推广应用这项新技术，文章基于超声振动切削理论，设计了一套超声振动车削装置，为实现黑色金属薄壁零件的精密加工提供了新的途径。     

功率超声振动系统的研究进展

功率超声振动系统是功率超声技术中的关键部分,其主要部分包括功率超声换能器、超声变幅杆以及超声工具头或超声辐射器。本文就功率超声换能振动系统设计中经常遇到的一些关键问题进行了简要的归纳和总结,目的在于为功率超声换能器的优化设计和性能改善提供一些有用的设计指南和解决措施。同时,对一些新的功率超声振动系统进行了介绍,并简要分析了其发展趋势和应用领域。     

超声弯曲模式变幅杆的振动分析

介绍了用传递矩阵分析超声弯曲变幅杆的方法,推导了变幅杆的频率方程、放大系数、形状因子的表达式。作为方法的应用例,对圆锥形变幅杆进行了一些数值计算。最后进行了验证。结果表明传递矩阵法是弯曲变幅杆分析的有效方法。     

Complex vibration ultrasonic welding systems with large area welding tips

Vibration and welding characteristics of complex vibration ultrasonic welding systems of 27 and 40 kHz were studied. Complex vibration systems, which have elliptical to circular or rectangular to square locus, are effective for ultrasonic welding of various specimens including the same and different metal specimens, and for direct welding of semiconductor tips and packaging of various electronic devices without solder. The complex vibration systems consist of a one-dimensional longitudinal-torsional vibration converter with slitted part, a stepped horn and a longitudinal vibration transducer as a driving source. The complex vibration welding tips of 27 and 40 kHz have enough area of 6-8 mm square for various welding specimens. Aluminum plate specimens of 0.3-1.0 mm thickness were successfully joined with weld strengths almost equal to aluminum specimen strength, and independent to the specimen direction. Required vibration amplitude of 40 kHz is smaller than that of 27 kHz.     

Transverse and torsional complex vibration systems for ultrasonic seam welding of metal plates

Transverse and torsional complex vibration systems for ultrasonic seam welding of metal plate specimens, using a 27 kHz complex vibration disk welding tip vibrating in transverse and torsional vibration modes, were studied. Using a complex vibration welding system with a welding tip vibrating in elliptical or circular locus, thick plate specimens can be welded with a more uniform and larger area compared to a conventional ultrasonic welding system. The disk welding tip vibrates in an elliptical or circular locus. The complex vibration system can continuously weld multiple parts of metal plate specimens such as heat sinks with a large number of fins.     

Measuring vibration characteristics at large amplitude region of materials for high power ultrasonic vibration system

This study proposes a method of estimating the mechanical quality factor of materials for high-power ultrasonic vibration systems under large vibration amplitude conditions. The quality factors of several metals as well as some polymers are measured by this method. In this method, the quality factor is calculated as the ratio of the reactive energy stored in a specimen to the dissipated energy. The dissipated energy is estimated from the input/output mechanical energy to the specimen by measurement of the vibration intensity, while the reactive energy is measured as the kinetic energy of the vibration. Then, the quality factor for the specified part can be extracted using this method. In this report, quality factors for torsional vibration were measured at about 30 kHz as functions of the vibration strain.     

The performance and design of ultrasonic vibration system for flexural mode

The matrix method for analyzing flexural vibration system is outlined. The displacement, stress and velocity gain of ultrasonic flexural vibration systems are investigated by transfer matrix method. A design method is given for flexural transducer and vibration system.     

Characteristics of coated copper wire specimens using high frequency ultrasonic complex vibration welding equipments

Welding characteristic of thin coated copper wires were studied using 40, 60, 100 kHz ultrasonic complex vibration welding equipments with elliptical to circular vibration locus. The complex vibration systems consisted of a longitudinal-torsional vibration converter and a driving longitudinal vibration system. Polyurethane coated copper wires of 0.036 mm outer diameter and copper plates of 0.3 mm thickness and the other dimension wires were used as welding specimens. The copper wire part is completely welded on the copper substrate and the insulated coating material is driven from welded area to outsides of the wire specimens by high frequency complex vibration.     

四分之一波长喇叭式集中变幅杆构成的超声振动刀具系统

将超声波变幅杆与弯曲振动刀杆作为一个系统加以研究.通过对四分之一波长喇叭式集中变幅杆激振弯曲振动刀杆时理论分析和试验发现,该刀具系统中的变幅杆和弯曲振动刀杆虽然可以单独设计,但是应当按节点激振方式工作。