如何提高嵌入式软件产品的测试效率,提高软件质量,已经成为当下重要的研究课题,而目前出现的典型开源测试框架主要针对通用嵌入式软件产品或者通用web领域软件产品,并不能满足轻量级操作系统资源受限的特定需求(例如内存占用少、节能效...如何提高嵌入式软件产品的测试效率,提高软件质量,已经成为当下重要的研究课题,而目前出现的典型开源测试框架主要针对通用嵌入式软件产品或者通用web领域软件产品,并不能满足轻量级操作系统资源受限的特定需求(例如内存占用少、节能效率高);针对这种状况设计并实现一种称为ACore Lite Test轻量级测试框架,并以轻量级操作系统内核中的计数信号量模块为例,说明了测试框架的使用方法,并对其设计和实现的正确性进行了验证。展开更多
A frequency invariant response algorithm is proposed for getting over the signal distortion in high frequency when the beamformer receives the broadband signals. In this method, the weight vector of the reference beam...A frequency invariant response algorithm is proposed for getting over the signal distortion in high frequency when the beamformer receives the broadband signals. In this method, the weight vector of the reference beam pattern is designed firstly, then the weight vectors when the beam response in the frequency sub-bands approaching the reference response mostly are computed by optimized method or adaptive method. By this method, the beam pattern in each sub-band can be almost kept invariable. As a result, the receiving chirp signal can be improved. Owing to the adoption of the adaptive method to approach the optimized vectors, it has no restricting of the array format and the element directivity, and the method can be used widely.展开更多
High performance force sensors often encounter the conflicting requirements of high resolution and large measurement range.To address this problem,this paper presents a conceptual design of a novel uniaxial force sens...High performance force sensors often encounter the conflicting requirements of high resolution and large measurement range.To address this problem,this paper presents a conceptual design of a novel uniaxial force sensor with large range and dual-stage force resolutions which enables us to measure forces within a wide range with satisfied resolutions.The newly developed force sensor features an aluminum alloy body with a probe to transfer external forces into the sensing element.It employs an optical linear encoder to detect the displacement of the sensing body.This sensing scheme may immunize outside electromagnetic noises and therefore enhance the performance of the sensor thanks to its digital signal output.In this paper,an accurate,analytical model for calculating the static stiffness and dynamics of the system was developed by using pseudo-rigid-body-model(PRBM)methodology.To optimize the design,finite element simulations were conducted.After a prototype sensor was fabricated,preliminary characterization tests were carried out to verify the accuracy of the theoretical model and demonstrate the effectiveness of the design.The experiment results indicate that the structure of the new sensor is compact,and it has the ability to measure both micro range and macro range forces within one setup,meanwhile keeps very fine resolutions.展开更多
文摘如何提高嵌入式软件产品的测试效率,提高软件质量,已经成为当下重要的研究课题,而目前出现的典型开源测试框架主要针对通用嵌入式软件产品或者通用web领域软件产品,并不能满足轻量级操作系统资源受限的特定需求(例如内存占用少、节能效率高);针对这种状况设计并实现一种称为ACore Lite Test轻量级测试框架,并以轻量级操作系统内核中的计数信号量模块为例,说明了测试框架的使用方法,并对其设计和实现的正确性进行了验证。
基金Supported by the 863 Foundation under Grant No.2002AA602230.
文摘A frequency invariant response algorithm is proposed for getting over the signal distortion in high frequency when the beamformer receives the broadband signals. In this method, the weight vector of the reference beam pattern is designed firstly, then the weight vectors when the beam response in the frequency sub-bands approaching the reference response mostly are computed by optimized method or adaptive method. By this method, the beam pattern in each sub-band can be almost kept invariable. As a result, the receiving chirp signal can be improved. Owing to the adoption of the adaptive method to approach the optimized vectors, it has no restricting of the array format and the element directivity, and the method can be used widely.
基金supported by the National Natural Science Foundation of China (Grant Nos. 91023036 and 51275018)
文摘High performance force sensors often encounter the conflicting requirements of high resolution and large measurement range.To address this problem,this paper presents a conceptual design of a novel uniaxial force sensor with large range and dual-stage force resolutions which enables us to measure forces within a wide range with satisfied resolutions.The newly developed force sensor features an aluminum alloy body with a probe to transfer external forces into the sensing element.It employs an optical linear encoder to detect the displacement of the sensing body.This sensing scheme may immunize outside electromagnetic noises and therefore enhance the performance of the sensor thanks to its digital signal output.In this paper,an accurate,analytical model for calculating the static stiffness and dynamics of the system was developed by using pseudo-rigid-body-model(PRBM)methodology.To optimize the design,finite element simulations were conducted.After a prototype sensor was fabricated,preliminary characterization tests were carried out to verify the accuracy of the theoretical model and demonstrate the effectiveness of the design.The experiment results indicate that the structure of the new sensor is compact,and it has the ability to measure both micro range and macro range forces within one setup,meanwhile keeps very fine resolutions.
